PUBLIC REVIEW DRAFT DRAFT  UGANDA STANDARD  
  DUS  310-1 
Second  Edition  
2016 -09-01 
 
 
 Reference number  
DUS  310-1: 2016 
© UNBS 2016   
  
Cement — Part 1: Composition, specification and conformity 
criteria for common cements 
 
 PUBLIC REVIEW DRAFTPUBLIC REVIEW DRAFTDRAFT  UGANDA S TANDARD  DUS  310-1: 2016  
 
© UNBS 2016  – All rights reserved  1 
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 20 15  
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The Executive Director 
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Web: www.unbs.go.ug  PUBLIC REVIEW DRAFT2 © UNBS 2016  – All rights reserved  
 Contents Page 
Foreword .............................................................................................................................................................. 4 
Cement — Part 1: Composition, specification and conformity criteria for common cements ...................5  
1 Scope ......................................................................................................................................................5  
2 Normative references ............................................................................................................................ 5 
3 Terms and definitions ...........................................................................................................................6  
4 Description of cement ...........................................................................................................................7  
5 Constituents ...........................................................................................................................................8  
5.1 General ....................................................................................................................................................8  
5.2 Main constituents ..................................................................................................................................8  
5.2.1  Portland cement clinker (K) ..................................................................................................................8  
5.2.2  Granulated blast furnace slag (S) ........................................................................................................8  
5.2.3  Pozzolanic materials (P, Q)  ................................................................ ................................ ...................9  
5.2.4  Fly ashes (V, W)  ................................ ................................ ................................................................ .....9  
5.2.5  Burnt shale (T)  ................................ ................................ ................................................................ ..... 10 
5.2.6  Limestone (L, L L) ................................ ................................ ................................................................  10 
5.2.7  Silica fume (D)  ................................ ................................ ................................................................ ..... 11 
5.3 Minor additional constituents  ................................................................ ................................ ............ 11 
5.4 Calcium sulphate  ................................ ................................ ................................................................  11 
5.5 Additives  ................................ ................................................................ ................................ .............. 11 
6 Composition and notation ................................................................................................................. 12 
6.1 Common cements ...............................................................................................................................  12 
6.2 Sulphate resisting common cements (SR -Cement)  ................................ ................................ ........ 14 
6.3 Low early strength common cements  ................................ ..............................................................  15 
7 Mechanical, physical, chemical and durability requirements ........................................................ 15 
7.1 Mechanical requirements ................................................................................................................... 15 
7.1.1  Standard strength  ................................ ................................ ...............................................................  15 
7.1.2  Early strength  ................................ ................................ ................................................................ ...... 15 
7.2 Physical requirements ....................................................................................................................... 16 
7.2.1  Initial setting time  ................................ ................................ ...............................................................  16 
7.2.2  Soundness  ................................ ................................................................ ................................ ........... 16 
7.2.3  Heat of hydration  ................................ ................................ ................................................................  16 
7.3 Chemical requirements ...................................................................................................................... 16 
7.4 Durability requirements  ................................ ................................ ................................ ..................... 17 
7.4.1  Gene ral ................................ ................................................................ ................................ ................. 17 
7.4.2  Sulphate resistance  ................................ ................................ ............................................................  18 
8 Standard designation .........................................................................................................................  18 
9 Conformity criteria ..............................................................................................................................  20 
9.1 General requirements .........................................................................................................................  20 
9.2 Conformity criteria for mechanical, physical and chemical properties and evaluation 
procedure ............................................................................................................................................ 21 
9.2.1  General  ................................ ................................................................ ................................ ................. 21 
9.2.2  Statistical conformity criteria  ................................................................ ................................ ............ 21 
9.2.3  Single result conformity criteria  ................................................................ ................................ ........ 24 
9.3 Conformity criteria for cement composition  ................................ ................................ .................... 25 
9.4 Conformity cr iteria for properties of the cement constituents  ................................ ...................... 25 
10 Marking, labelling, packaging and storage ...................................................................................... 25 
10.1  Marking and labelling .........................................................................................................................  25 
10.2  Packaging and storage ...................................................................................................................... 26 
Annex A (normative)  List of common cements considered as sulphate resisting in EAC 
member states but not included in table 2 ....................................................................................... 27 PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  3 
 Bibliography ...................................................................................................................................................... 28 
 PUBLIC REVIEW DRAFT4 © UNBS 2016  – All rights reserved  
 Foreword 
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and 
Cooperatives established under Cap 327, of the Laws of Uganda, as amended.  UNBS is mandated to co-
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO). 
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of representatives 
of consumers, traders, academicians, manufacturers, government and other stakeholders. 
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and 
the general public for comments. The committee reviews the comments before recommending the draft 
standards for approval and declaration as Uganda Standards by the National Standards Council.  
DUS  310-1 was prepared by Technical Committee TC3 , Cement, building lime, clay and related products 
In the preparation of this Uganda Standard, reference was made to the following standard: 
EN 197-1: 2011: Cement – Part 1; Composition, specifications and conformity criteria for common cements 
The assistance derived from the above source is hereby acknowledged with thanks. 
This second edition cancels and replaces the first edition ( US 310 -1:2001 ), which has been technically 
revised.  
DUS  310 consists of the following parts, under the general title Cement —: 
Part 1: Composition, specification and conformity criteria for common cement  
Part 2: Conformity evaluation PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  5 
  Cement — Part 1: Composition, specification and conformity 
criteria for common cements 
1 Scope 
This Draft Uganda standard gives the specifications which include mechanical, physical and chemical 
requirements of 27 distinct common cements, seven sulphate resisting common cements as well as three 
distinct low early strength blast furnace cements and two sulphate resisting low early strength blast 
cements and their constituents. 
The standard also gives the composition of each cement in terms of proportions and requirements of the 
constituents which are to be combined to produce these distinct products in a range of nine strength 
classes. 
Furthermore, this standard states the conformity criteria and the related rules. Necessary durability 
requirements are also given. 
NOTE 1 In addition to the specified requirements, an exchange of additional information between the cement 
manufacturer and user may be helpful. The procedures for such an exchange are not within the scope of this standard 
but should be dealt with in accordance with national standards or regulations or may be agreed between the parties 
concerned.  
NOTE 2 The word "cement" in this standard is used to refer only to common cements unless otherwise specified.  
2 Normative references 
The following referenced documents are indispensable for the application of this document. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies. 
ASTM C311/C311M –13, Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans 
for Use in Portland-Cement Concrete  
ASTM C494/C494M –13, Standard Specification for Chemical Admixtures for Concrete 
ASTMC 1777 Standard Test Method for Rapid Determination of the Methylene Blue Value for Fine 
Aggregate or Mineral Filler Using a Colorimeter 
DUS  310-2, Cement — Part 2: Conformity evaluation   
DUS  310-1, Concrete — Part 1: Specification, performance, production and conformity  
DUS  100-1, Cement — Test methods — Part 1: Determination of strength   
DUS  100-2, Cement — Test methods — Part 2: Chemical analysis of cement  
DUS  100-3, Cement — Test methods — Part 3: Determination of setting time and soundness 
DUS  100-5, Cement — Test methods — Part 5: Pozzolanicity test for Pozzolanic cements   
DUS  100-6, Cement — Test methods — Part 6: Determination of fineness   
DUS  100-7, Cement — Test methods — Part 7: Methods of taking and preparing samples of cement 
EN 13639, Determination of total organic carbon content in limestone  PUBLIC REVIEW DRAFT6 © UNBS 2016  – All rights reserved  
 ISO 9277, Determination of the specific surface area of solids by gas adsorption using the BET method 
ISO 9286, Abrasive grains and crude — Chemical analysis of silicon carbide  
ISO 29582- 2, Methods of testing cement —Determination of the heat of hydration —Part 2: Semi-adiabatic 
method 
3 Terms and definitions 
For the purposes of this standard, the following terms and definitions shall apply   
3.1 
reactive calcium oxide (CaO)  
fraction of the calcium oxide which under normal hardening conditions can form calcium silicate hydrates 
or calcium aluminate hydrates  
NOTE To evaluate this fraction the total calcium oxide content (see DUS  100-2) is reduced by the fraction 
corresponding to calcium carbonate (CaCO 3), based on the measured carbon dioxide (CO 2) content ( DUS  100-2) and 
the fraction corresponding to calcium sulphate (CaSO 4), based on the measured sulphate (SO 3) content (see DUS  
100-2) after substraction of the S0 3 taken up by alkalis.  
3.2 
reactive silicon dioxide (SiO 2)  
fraction of the silicon dioxide that is soluble after treatment with hydrochloric acid (HCI) and with boiling 
potassium hydroxide (KOH) solution  
NOTE The quantity of reactive silicon dioxide is determined by subtracting from the total silicon dioxide content 
(see EAS 148-2) that fraction contained in the residue insoluble in hydrochloric acid and potassium hydroxide (see 
DUS  100-2), both on a dry basis.  
3.3 
main constituent  
specially selected inorganic material in a proportion exceeding 5 % by mass related to the sum of all main 
and minor additional constituents  
3.4 
minor additional constituent  
specially selected inorganic material used in a proportion not exceeding a total of 5 % by mass related to 
the sum of all main and minor additional constituents  
3.6 
strength class of cement  
class of compressive strength  
3.7  
autocontrol testing  
continual testing by the manufacturer of cement spot samples taken at the point(s) of release from the 
factory/depot  
3.8 
control period  
period of production and dispatch identified for the evaluation of the autocontrol test results  
3.9 
characteristic value  
value of a required property outside of which lies a specified percentage, the percentile Pk, of all the values 
of the population  
3.10 
specified characteristic value  
characteristic value of a mechanical, physical or chemical property which in the case of an upper limit is 
not to be exceeded or in the case of a lower limit is, as a minimum, to be reached  PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  7 
 3.11 
single result limit value  
value of a mechanical, physical or chemical property which for any single test result in the case of an upper 
limit is not to be exceeded or in the case of a lower limit is, as a minimum, to be reached  
3.12 
allowable probability of acceptance CR  
for a given sampling plan, the allowed probability of acceptance of cement with a characteristic value 
outside the specified characteristic value  
3.13 
sampling plan  
specific plan which states the (statistical) sample size(s) to be used, the percentile Pk and the allowable 
probability of acceptance CR  
3.14 
spot sample  
sample taken at the same time and from one and the same place, relating to the intended tests. It can be 
obtained by combining one or more immediately consecutive increments (see DUS  100-7)  
3.15 
heat of hydration 
quantity of heat developed by the hydration of cement within a given period of time 
3.16 
low heat common cement 
common cement with a limited heat of hydration 
3.17 
sulphate resisting common cement 
common cement which fulfils the requirements for sulphate resisting properties 
3.18 
low heat low early strength blast furnace cement 
low early strength blast furnace cement with a limited heat of hydration 
3.19 
sulphate resisting low early strength blast furnace cement 
low early strength blast furnace cement which fulfils the requirements for sulphate resisting properties 
4 Description of cement 
Cement is a hydraulic binder, that is. a finely ground inorganic material which, when mixed with water, 
forms a paste which sets and hardens by means of hydration reactions and processes and which, after 
hardening, retains its strength and stability even under water.  
Cement conforming to this standard termed CEM cement, shall, when appropriately batched and mixed 
with aggregate and water, be capable of producing concrete or mortar which retains its workability for a 
sufficient time and shall after defined periods attain specified strength levels and also possess long-term 
volume stability.  
Hydraulic hardening of CEM cement is primarily due to the hydration of calcium silicates but other chemical 
compounds may also participate in the hardening process, for example, aluminates. The sum of the 
proportions of reactive calcium oxide (CaO) and reactive silicon dioxide (SiO 2) in CEM cement shall be at 
least 50 % by mass when the proportions are determined in accordance with DUS 100- 2.  PUBLIC REVIEW DRAFT8 © UNBS 2016  – All rights reserved  
 CEM cements consist of different materials and are statistically homogeneous in composition resulting 
from quality assured production and material handling processes. The link between these production and 
material handling processes and the conformity of cement to this standard is elaborated in DUS  310-2.  
5 Constituents 
5.1 General 
The requirements for the constituents specified in 5.2 to 5.5 shall be determined in principle in accordance 
with the test methods described in DUS 1 00 unless otherwise specified.  
5.2 Main constituents 
5.2.1  Portland cement clinker (K) 
Portland cement clinker is made by sintering a precisely specified mixture of raw materials (raw meal, 
paste or slurry) containing elements, usually expressed as oxides, CaO, SiO 2, Al 2O3 Fe2O3 and small 
quantities of other materials. The raw meal, paste or slurry is finely divided, intimately mixed and therefore 
homogeneous.  
Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium 
silicates (3CaO.SiO 2 and 2CaO.SiO 2) the remainder consisting of aluminium and iron containing clinker 
phases and other compounds. The ratio by mass (CaO)/(SiO 2) shall be not less than 2.0. The content of 
magnesium oxide (MgO) shall not exceed 5.0 % by mass.  
Portland cement clinker incorporated in sulphate resisting Portland cement (CEM I) and sulphate resisting 
pozzolanic cements (CEM IV) shall fulfill additional requirements for tricalcium aluminate content (C 3A). 
The tricalcium aluminate content shall be calculated by Equation (1) as follows: 
F1.69 2.65AC3
 (1) 
where  
A is the percentage of aluminium oxide (AI 2O3) by mass of the clinker as determined in accordanc e 
with DUS  100-2; 
F is the percentage of iron (III) oxide (Fe 2O3) by mass of the clinker as determined in accordance 
with DUS 1 00-2.Sulphate resisting Portland cements and sulphate resisting pozzolanic cements 
are clinker in which the C 3A content does not exceed: 
a) for CEM I: 0 %, 3 % or 5 % as appropriate(see 6.2); and 
b) for CEM IV/A and CEM IV/B: 9 % 
5.2.2  Granulated blast furnace slag (S) 
Granulated blast furnace slag is made by rapid cooling of a slag melt of suitable composition, as obtained 
by smelting iron ore in a blast furnace and contains at least two-thirds by mass of glassy slag and 
possesses hydraulic properties when suitably activated.  
Granulated blast furnace slag shall consist of at least two-thirds by mass of the sum of calcium oxide 
(CaO), magnesium oxide (MgO) and silicon dioxide (SiO 2). The remainder contains aluminium oxide 
(AI2O3) together with small amounts of other compounds. The ratio by mass (CaO + MgO)/(SiO 2) shall 
exceed 1.0.  PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  9 
 5.2.3  Pozzolanic materials (P, Q)  
5.2.3.1 General  
Pozzolanic materials are natural substances of siliceous or silico-aluminous composition or a combination 
thereof. Although fly ash and silica fume have Pozzolanic properties, they are specified in separate clauses 
(see 5.2.4 and 5.2.7).  
Pozzolanic materials do not harden in themselves when mixed with water but, when finely ground and in 
the presence of water, they react at normal ambient temperature with dissolved calcium hydroxide 
(Ca(OH) 2) to form strength-developing calcium silicate and calcium aluminate compounds. These 
compounds are similar to those which are formed in the hardening of hydraulic materials. Pozzolanic 
materials consist essentially of reactive silicon dioxide (SiO 2) and aluminium oxide (AI 2O3). The remainder 
contains iron oxide (Fe 2O3) and other oxides. The proportion of reactive calcium oxide for hardening is 
negligible. The reactive silicon dioxide content shall be not less than 25.0 % by mass.  
Pozzolanic materials shall be correctly prepared, that is, selected, homogenized, dried, or heat treated and 
comminuted, depending on their state of production or delivery.  
5.2.3.2 Natural Pozzolana (P)  
Natural Pozzolanas are usually materials of volcanic origin or sedimentary rocks with suitable chemical 
and mineralogical composition and shall conform to 5.2.3.1.  
5.2.3.3 Natural calcined Pozzolana (Q)  
Natural calcined Pozzolanas are materials of volcanic origin, clays, shales or sedimentary rocks, activated 
by thermal treatment and shall conform to 5.2.3.1.   
5.2.4  Fly ashes (V, W)  
5.2.4.1 General  
Fly ash is obtained by electrostatic or mechanical precipitation of dust-Iike particles from the flue gases 
from furnaces fired with pulverized coal. Ash obtained by other methods shall not be used in cement that 
conforms to DUS  310- 1.  
Fly ash may be siliceous or calcareous in nature. The former has Pozzolanic properties; the latter may 
have, in addition, hydraulic properties. The loss on ignition of fly ash determined in accordance with DUS  
100-2, but using an ignition time of 1 h, shall not exceed 5.0 % by mass.  
Fly ash with loss on ignition of 5.0 % - 7.0 % by mass may also be accepted, provided that particular 
requirements for durability, especially frost resistance, and for compatibility with admixtures are met 
according to the appropriate standards and/or regulations for concrete or mortar in the place of use. In the 
case of fly ash with a loss on ignition between 5.0 % and 7.0 % by mass the maximum limit, 7.0 %, shall be 
stated on the packaging and/or the delivery note of the cement.  
5.2.4.2 Siliceous fly ash (V)  
Siliceous fly ash is a fine powder of mostly spherical particles having Pozzolanic properties. It consists 
essentially of reactive silicon dioxide (SiO 2) and aluminium oxide (AI 2O3). The remainder contains iron 
oxide (Fe 2O3) and other compounds.  
The proportion of reactive calcium oxide shall be less than 10.0 % by mass; the content of free calcium 
oxide, as determined by the method described in ASTM C311/C311M –13 shall not exceed 1.0 % by mass. 
Fly ash having a free calcium oxide content higher than 1.0 % by, mass but less than 2.5 % by mass is 
also acceptable provided that the requirement on expansion (soundness) does not exceed 10 mm when 
tested in accordance with DUS  100-3 using a mixture of 30 % by mass of siliceous fly ash and 70 % by PUBLIC REVIEW DRAFT10 © UNBS 2016  – All rights reserved  
 mass of a CEM I cement conforming to DUS  310-1 (see Clause 6). The reactive silicon dioxide content 
shall not be less than 25.0 % by mass.  
5.2.4.3 Calcareous fly ash (W)  
5.2.4.3.1  Calcareous fly ash is a fine powder, having hydraulic and/or Pozzolanic p roperties. It consists 
essentially of reactive calcium oxide (CaO), reactive silicon dioxide (SiO 2) and aluminium oxide (AI 2O3). 
The remainder contains iron oxide (Fe 2O3) and other compounds. The proportion of reactive calcium oxide 
shall not be less than 10.0 % by mass. Calcareous fly ash containing between 10.0 % and 15.0 % by mass 
of reactive calcium oxide shall contain not less than 25.0 % by mass of reactive silicon dioxide.  
5.2.4.3.2  Adequately ground calcareous fly ash containing more than 15.0 % by  mass of reactive 
calcium oxide, shall have a compressive strength of at least 10.0 MPa at 28 days when tested in 
accordance with DUS  100-1. Before testing, the fly ash shall be ground and the fineness, expressed as the 
proportion by mass of the ash retain ed when wet sieved on a 40 -µm mesh sieve, shall be between 10 % 
and 30 % by mass. The test mortar shall be prepared with ground calcareous fly ash only instead of 
cement. The mortar specimens shall be demoulded 48 h after preparation and then cured in a mo ist 
atmosphere of relative humidity of at least 90 % until tested.  
5.2.4.3.3  The expansion (soundness) of calcareous fly ash shall not exceed 10 mm when tested in 
accordance with DUS  100-3 using a mixture of 30 % by mass of calcareous fly ash ground as de scribed 
above and 70 % by mass of CEM cement conforming to DUS  310-1.  
NOTE If the sulphate (SO 3) content of the fly ash exceeds the permissible upper limit for the sulphate content of 
the cement then this has to be taken into account for the manufacture of the cement by appropriately reducing the 
calcium sulphate-containing constituents.  
5.2.5  Burnt shale (T)  
5.2.5.1  Burnt shale, specifically burnt oil shale, is produced in a special kiln at temperatures of 
approximately 800 °C. Owing to the composition of the natural material and the production process, burnt 
shale contains clinker phases, mainly dicalcium silicate and monocalcium aluminate. It also contains, 
besides small amounts of free calcium oxide and calcium sulphate, larger proportions of pozzolanically 
reacting oxides, especially silicon dioxide. Consequently, in a finely ground state burnt shale shows 
pronounced hydraulic properties like Portland cement and in addition Pozzolanic properties.  
5.2.5.2  Adequately ground burnt shale shall have a compressive strength of at least 25.0 MPa at 28 
days when tested in accordance with DUS  100-1. The test mortar shall be prepared with finely ground 
burnt shale only instead of cement. The mortar specimens shall be demoulded 48 h after preparation and 
cured in a moist atmosphere of relative humidity of at least 90 % until tested.  
5.2.5.3  The expansion (soundness) of burnt shale shall not exceed 10 mm when tested in accordance 
with DUS  100-3 using a mixture of 30 % by mass of ground burnt shale and 70 % by mass  of a CEM I 
cement conforming to DUS  310-1.  
NOTE If the sulphate (SO 3) content of the burnt shale exceeds the permissible upper limit for the sulphate content 
of the cement then this has to be taken into account for the manufacture of the cement by appropriately reducing the 
calcium sulphate-containing constituents. 
5.2.6  Limestone (L, LL)  
Limestone shall meet the following requirements:  
a) the calcium carbonate (CaCO 3) content calculated from the calcium oxide content shall be at least 
75 % by mass;  
b) the clay content, determined by the methylene blue test in accordance with ASTM C 1 777, shall 
not exceed 1.20 g/100 g. For this test the limestone shall be ground to a fineness of approximately 
5 000 cm2/g determined as specific surface in accordance with DUS 1 00-6; 
c) the total organic carbon (TOC) content, when tested in accordance with EN 13639, shall conform 
to one of the following criteria:  PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  11 
 (i) LL: shall not exceed 0.20 % by mass; and 
(ii) L: shall not exceed 0.50 % by mass. 
5.2.7  Silica fume (D) 
5.2.7.1  Silica fume originates from the reduction of high purity quartz with coal in electric arc furnaces 
in the production of silicon and ferrosilicon alloys and consists of very fine spherical particles containing at 
least 85 % by mass of amorphous silicon dioxide. The content of elemental silicon (Si) determined 
according to ISO 9286 shall not be greater than 0.4% by mass. 
5.2.7.2  Silica fume shall meet the following requirements:  
a) the loss on ignition shall not exceed 4.0 % by mass determined in accordance with DUS  100-2 but 
using an ignition time of 1 h; and 
b) the specific surface (BET) of the untreated silica fume shall be at least 15.0 m2/g when tested in 
accordance with ISO 9277.  
5.2.7.3  For intergrinding with clinker and calcium sulphate the silica fume may be in its original state 
or compacted or pelletized (with water).  
5.3 Minor additional constituents  
Minor additional constituents are specially selected, inorganic natural mineral materials, inorganic mineral 
materials derived from the clinker production process or constituents as specified in 5.2 unless they are 
included as main constituents in the cement.  
Minor additional constituents, after appropriate preparation and on account of their particle size distribution, 
improve the physical properties of the cement (such as workability or water retention). They can be inert or 
have slightly hydraulic, latent hydraulic or Pozzolanic properties. However, no requirements are set for 
them in this respect.  
Minor additional constituents shall be correctly prepared, that is, selected, homogenized, dried and 
comminuted depending on their state of production or delivery. They shall not increase the water demand 
of the cement appreciably, impair the resistance of the concrete or mortar to deterioration in any way or 
reduce the corrosion protection of the reinforcement.  
NOTE Information on the minor additional constituents in the cement should be available from the manufacturer 
on request.  
5.4 Calcium sulphate  
Calcium sulphate is added to the other constituents of cement during its manufacture to control setting.  
Calcium sulphate can be gypsum (calcium sulphate dihydrate, CaSO 4.2H 2O), hemihydrate (CaSO 4 
.1/2H 2O), or anhydrite (anhydrous calcium sulphate, CaSO 4) or any mixture of them. Gypsum and 
anhydrite are found naturally. Calcium sulphate is also available as a by-product of certain industrial 
processes.  
5.5 Additives 
Additives for the purpose of DUS  310-1 are constituents not covered in 5.2 to 5.4 which are added to 
improve the manufacture or the properties of the cement.  
The total quantity of additives shall not exceed 1.0 % by mass of the cement (except for pigments). The 
quantity of organic additives on a dry basis shall not exceed 0.5 % by mass of the cement.  PUBLIC REVIEW DRAFT12 © UNBS 2016  – All rights reserved  
 These additives shall not promote corrosion of the reinforcement or impair the properties of the cement or 
of the concrete or mortar made from the cement.  
When admixtures for concrete, mortar or grouts conforming to the ASTM C494/C494M –13 are used in 
cement, the standard notation of the admixture shall be declared on bags or delivery documents.  
6 Composition and notation 
6.1 Common cements 
The 27 products in the family of common cements, covered by DUS 310-1 and their notation are given in 
Table 1. They are grouped into five main cement types as follows:  
a) CEM I Portland cement;  
b) CEM II Portland-composite cement; 
c) CEM III Blast furnace cement; 
d) CEM IV Pozzolanic cement; and 
e) CEM V Composite cement. 
The composition of each of the 27 products in the family of common cements shall be in accordance with 
Table 1. 
NOTE : For clarity in definition, the requirements for the composition refer to the sum of all main and 
minor additional constituents. The final cement is to be understood as the main and minor additional 
constituents plus the necessary calcium sulphate (see 5.4) and any additives (see 5.5) PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  13 
 Table 1 — The 27 products in the family of common cements 
Main  
Types  Notation of the 27 
products (types of 
common cement)  Composition percentage by mass a 
Minor 
additio
nal 
constit
uents  
 Main constituents  
Clinker  Blast -
Furnace  Silica 
fume  Pozzolana  Fly ash  Burnt  
Shale  Lime stone  
Natural  Natural 
calcined  Siliceo
us Calcar
eous   
K S Db p q V W T L LL 
CEM I  Portland  
cement  CEM I  95-100 – – – – – – – – - 0 - 5 
CEM II  Portland –
slag 
cement  CEM II/A -S 80–94 6 - 20 – – – – – – – – 0 - 5 
CEM II/B -S 65–79 21 - 35 - – – – – – – – 0 - 5 
Portland -
silica fume 
cement  CEM I/A -D 90 – 94 – 6 - 10 – – – – – – – 0 - 5 
Portland –
Pozzolana 
cement  CEM II/A -P 80 – 94 – – 6 - 20 – – – – – – 0 - 5 
CEM II/B -P 65- 79 – – 21 - 35 – – – – – – 0 - 5 
CEM II/A -Q 80 - 94 – –  6 - 20 – – – – – 0 - 5 
CEM II / B -Q 65 – 79 – – – 21 -35 – – – – – 0 - 5 
Portland –
fly ash 
cement  CEM II / A -V 80–94 – – – – 6 - 20 – – – – 0 - 5 
CEMII / B -V 65 – 79 – – – – 21 - 35 – – – – 0 - 5 
CEM  II/A-W 80–94 – – – – – 6 - 20 – – – 0 - 5 
CEMII/B -W 65 – 79 – – – – – 21 - 35 – – – 0 - 5 
Portland –
burnt 
shale 
cement  CEM II/A -T 80–94 – – – – – – 6 - 20 – – 0 - 5 
CEM II/ B -T 65 – 79 – – – – – – 21 - 
35 – – 0 - 5 
Portland – 
limestone 
cement  CEM II/ A-L 80 - 94 – – – – – –– – 6 - 
20 – 0 - 5 
CEM II/A -L 65- 79 – – – – – – – 21 - 
35 – 0 - 5 
CEM II/A -LL 80 - 94 – – – – – – – – 6 - 
20 0- 5 
CEM II/ B -LL 65 - 79 – – – – – – – – 21 - 
35 0- 5 
Portland 
composite 
cementc) CEM II/ A -M 80–88  
12- 20 0 - 5 
CEM II/ B -M 65 -79  
21 - 35 0- 5 
CEM III  Blast – 
furnace 
cement  CEM III/A  35 - 64 36 -65 – – – – – – – – 0 - 5 
CEM III/B  20 - 34 66 - 80 – – – – – – – – 0 - 5 
CEM III/C  5 - 19 81 - 95 – – – – – – – – 0 - 5 
CEM IV  Pozzolanic 
cement c) CEM IV/A  65 - 88 –  
11 - 35 – - - 0 - 5 
CEM IV/B  45 - 64 –  
36 - 55 – - - 0 - 5 
CEN V  Composite 
cement c) CEM V/ A  40 - 64 18 - 30 -  
18 - 30 – – - - 0 - 5 
CEM V/B  20 - 38 31 - 50 -  
31 - 49 – – - - 0 - 5 
a) The values in the table refer to the sum of the main and minor additional constituents  
b) The proportion of silica fume is limited to 10 %.  
c) In Portland –composite cements CEM II/A –M and CEM II/B –M, in Pozzolanic cements CEM IV/A and CEM IV/B and in composite cements 
CEM V/A and CEM V/B the main constituents other than clinker shall be declared by designation of the cement (for example see Clause 8 ). PUBLIC REVIEW DRAFT14 © UNBS 2016  – All rights reserved  
 6.2 Sulphate resisting common cements (SR-Cement) 
6.2.1  The seven products in the family of the sulphate resisting common cements, covered by this 
standard are given in Table 2.  
6.2.2  They are grouped into three main cement types as follows: 
a) Sulphate resisting Portland cement: 
(i) CEM I-SR 0  Sulphate resisting Portland cement (C 3A content of the clinker = 0 %); 
(ii) CEM I-SR 3  Sulphate resisting Portland cement (C 3A content of the clinker ≤ 3 %); and 
(iii) CEM I-SR 5  Sulphate resisting Portland cement (C 3A content of the clinker ≤ 5 %); 
b) Sulphate resisting blast furnace cement: 
(i) CEM III/B- SR  Sulphate resisting blast furnace cement (no requirement on C 3A content of 
the clinker); and 
(ii) CEM III/C- SR  Sulphate resisting blast furnace cement (no requirement on C 3A content of 
the clinker); 
c) Sulphate resisting pozzolanic cement: 
(i) CEM IV/A- SR  Sulphate resisting pozzolanic cement (C 3A content of the clinker ≤ 9 %); 
(ii) CEM IV/B- SR  Sulphate resisting pozzolanic cement (C 3A content of the clinker ≤ 9 %); 
6.2.3  The composition of each of the seven products in the family of the sulphate resisting common 
cements shall be in accordance with Table 2. The cement type notation shal l be in accordance with the 
requirements of this standard with additional notation by SR 0, SR 3, SR 5 for CEM I cements and only 
“SR” for CEM III and IV cements.  PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  15 
 Table 2 — Seven products in the family of sulphate resisting common cements 
Main 
Types  Notat ion of the seven 
products(types of sulphate 
resisting common cement)  Composition (percentage by massa) 
Main constituents  Minor 
additional 
constituent
s Clinker  
K Blast 
furnace 
slag 
S Pozzolana 
slag 
P Siliceous 
fly ash  
V 
CEM I  Sulphate 
resisting 
Portland 
cement  CEM I -SR 0  
CEM I -SR 3  
CEM I -SR 5  95 - 100 - - - 0 - 5 
CEM III  Sulphate 
resisting 
blast furnace 
cement  CEM III/B -SR 20 - 34 66- 80 - - 0 - 5 
CEM III/C -SR 5 - 19 81 - 95 - - 0 - 5 
CEM 
IV Sulphateb 
resisting 
pozzolanic  CEM IV/A -SR 65-79 - ---21- 35--- 0 - 5 
CEM IV/B -SR 45-64 - --- 36 - 55--- 0 - 5 
a) The values in the table refer to the sum of the main and minor additional constituents  
b) In sulphate resisting pozzolanic cements, types CEM IV/B -SR, the main constituents other than clin ker shall be 
declared by designation of the cement ( for examples, see Clause 8)  
 
6.3 Low early strength common cements 
Low early strength common cements are CEM III blast furnace cements as specified in Table 1. They differ 
from other common cements regarding the early strength requirements (see 7.1.2). Low early strength 
CEM III cements conforming to the requirements in Table 3 can also be declared as sulphate resisting 
common cements. 
7 Mechanical, physical, chemical and durability requirements 
7.1 Mechanical requirements 
7.1.1  Standard strength 
The standard strength of cement is the compressive strength determined in accordance with DUS 1 00–1 at 
28 days and shall conform to the requirements in Table 3.  
Three classes of standard strength are included: class 32.5 class 42.5 and class 52.5 (see Table 3).  
7.1.2  Early strength  
The early strength of cement is the compressive strength determined in accordance with DUS 1 00–1 at 
either 2 days or 7 days and shall conform to the requirements in Table 3.  
Three classes of early strength are included for each class of standard strength, a class with ordinary early 
strength, indicated by N, and a class with high early strength, indicated by R and a class with low early 
strength, indicated by L. (see Table 3).  PUBLIC REVIEW DRAFT16 © UNBS 2016  – All rights reserved  
 Table 3 — Mechanical and physical requirements given as characteristics values 
Strength  
Class  Compressive strength  
MPa Initial setting 
time Soundness 
(expansion)  
 
2 days  7 days  28 days  min mm 
32.5 La -  12.0- 
 32.5  52.5  75 
 10 32.5 N  –  16.0 
32. 5 R   10.0 – 
42.5 La -  16.0 
 42.5  62.5  60 42.5 N   10.0 – 
42.5 R   20.0 – 
52.5 La  10.0 -    
52.5 N   20.0 –  
 52.5  
–  
 45 525 R   30.0 – 
a) Strength class only defined for CEM III cements  
 
7.2 Physical requirements  
7.2.1  Initial setting time  
The initial setting time, determined in accordance with DUS 1 00–3, shall conform to the requirements in 
Table 3.  
7.2.2  Soundness  
The expansion, determined in accordance with DUS 1 00–3, shall conform to the requirement in Tabl e 3.  
7.2.3  Heat of hydration 
The heat of hydration of low heat common cements shall not exceed the characteristic value of 270 J/g, 
determined in accordance with DUS  100-8 at 7 days or in accordance with  ISO 29582-2 at 41 h.  
Low heat common cements shal l be identified by the notation “LH”  
NOTE 1 Pre-normative research has demonstrated the equivalence of test results for DUS  100-8 at 7 days. 
Nevertheless, in case of dispute between laboratories, the method to be applied should be agreed. 
NOTE 2 Cement with a higher hydration heat value is appropriate for some applications. It is necessary that this 
value should be agreed upon between manufacturer and user, and that this cement should not be identified as low 
heat cement (LH). 
7.3 Chemical requirements 
The properties of the cements type and strength class shown in columns 3 and 4 respectively of Table 3 
shall conform to the requirements listed in column 5 of this table when tested in accordance with the 
standard referred to in column 2. PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  17 
 Table 4 — Chemical requirements given as characteristic values 
 
1 2 3 4 5 
Property  Test reference  Cement type  Strength class  Requirements a) 
Loss on ignition  DUS  100–2 CEM I  
CEM III  All  5.0 %  
Insoluble residue  DUS  100–2 b) CEM I  
CEM III  All  5.0 %  
Sulphate content  
(as SO 3) DUS  100–2 CEM I  
CEM II c) 
CEM IV  
CEM V  32.5 N  
32.5 R  
42.5 N   3.5 %  
42.5 R  
52.5 N  
52.5 R   
 4.0 %  
CEM III d) All 
Chloride content  DUS  100-2 all e) All  0.10 %f) 
Pozzolanicity  DUS  100–5 CEM IV  All Satisfies the test  
a) Requirements are give n as percentage by mass of the final cement.  
b) Determination of residue insoluble in hydrochloric acid and sodium carbonate.  
c) Cement type CEM II/B –T and CEM II/B -M with a T content > 20 may contain up to 4.5 % sulphate (as SO 3) for all 
strength classes.  
d) Cement type CEM III/C may contain up to 4.5 % sulphate.  
e) Cement type CEM III may contain more than 0.10 % chloride but in that case the maximum chloride content shall be 
stated on the packaging and/or the delivery note.  
f) For pre –stressing applicati ons cements may be produced according to a lower requirement.  If so, the value of 0.10 % 
shall be replaced by this lower value which shall be stated in the delivery note.  
 
7.4 Durability requirements 
7.4.1  General 
In many applications, particularly in severe environment conditions, the choice of cement has an influence 
on the durability of concrete, mortar and grouts, for examplefrost resistance and protection of 
reinforcement. Alkalis from cement or other concrete constituents may react chemically with certain 
aggregates. Adequate requirement are given in EAS 131- 1. 
 
The choice of cement, from this standard, particularly as regards type and strength class for different 
applications and exposure classes shall follow the appropriate standards and/or regulations for concrete or 
mortar valid in the place of use. PUBLIC REVIEW DRAFT18 © UNBS 2016  – All rights reserved  
 Low early strength common cements will have lower early strength compared to other common cement of 
the same standard strength class and may require additional precautions in their use such as extension of 
formwork stripping times and protection during adverse weather. In all other respects, their performance 
and suitability of applications will be similar to the other common cements, conforming to this standard, of 
the same type and standard strength class. 
7.4.2  Sulphate resistance 
Sulphate resisting common cement shall fulfill the additional chemical requirements specified in table 5. 
Sulphate resisting common cements shall be identified by the notation SR. 
Table 5 — Additional requirements for sulphate resisting common cements given as characteristic 
1 2 3 4 5 
Property  Test reference  Cement type  Strength class  Requirementsa) 
Sulphate content  
(as SO 3) DUS  100-2 CEM I -SR 0  
CEM I -SR 3  
CEM I -SR 5b) 
CEM IV/A -SR 
CEM IV/B -SR 32.5 N  
32.5 R  
42.5 N  ≤ 3.0 %  
42.5 R  
52.5 N  
52.5 R  ≤ 3.5 %  
C3A 
in clinker  DUS  100 -2c CEM I -SR 0  All = 0 %  
CEM I - SR 3  ≤ 3 % 
CEM I -SR 5  ≤ 5 % 
≤ 9 % 
-e) CEM IV/A -SR 
CEM IV/B -SR 
Pozzolanicity   DUS  148-5 CEM IV/A -SR 
CEM IV/B -SR All Satisfies the test at 8 
days  
a) Requirements are given as percentage by mass of the final cement or clinker as defined in the table.  
b) For specific applications cements CEM I -SR 5 may be produced according to higher sulphate content. If so the numerical value of 
this requirement for higher  sulphate content shall be declared on the delivery note.  
c) In the specific case of CEM I, it is permissible to calculate the C 3A content of clinker from the chemical analysis of the cement. The 
C3A content of clinker shall be calculated by the formula: C 3A = 2.65 A -1.69 F (see 5.2.1).  
d) Until the test method is finalized the C 3A content of clinker (see 5.2.1) shall be determined on the basis of the analysis of clinker as 
part of the manufacturer’s Factory Production Control ( DUS  310-2, 4.2.1).  
 
8 Standard designation  
CEM cements shall be identified by at least the notation of the cement type as specified in Table 1 and the 
figures 32.5, 42.5 or 52.5 indicating the strength class (see 7.1). In order to indicate the early strength 
class the letter N or the letter R shall be added as appropriate (see 7.1).  
EXAMPLE 1: 
Portland cement conforming to this standard of strength class 42.5 with a high early strength is identified by:  
Portland cement DUS  310–1– CEM I 42.5 R 
EXAMPLE 2:  PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  19 
 Portland –limestone cement containing between 6 % and 20 % by mass of limestone with a TOC content not exceeding 
0.50 % by mass (L) of strength class 32.5 with an ordinary early strength is identified by:  
Portland –limestone cement DUS  310–1 –CEM II/A –L 32. 5 N 
EXAMPLE 3:  
Portland –composite cement containing in total a quantity of granulated blast furnace slag (S), siliceous fly ash (V) and 
limestone (L) of between 6 % and 20 % by mass and of strength class 32.5 with a high early strength is identified by:  
Portland –composite cement D US 310–1 –CEM II/A –M (S –V–L) 32.5 R  
EXAMPLE 4:  
Composite cement containing between 18 % and 30 % by mass of granulated blast furnace slag (S) and between 18 
% and 30 % by mass of siliceous fly ash (V) of strength class 32.5 with an ordinary early strength is identified by:  
Composite cement DUS  310–1 –CEM V/A (S –V) 32.5 N  
EXAMPLE 5 :  
Blast furnace cement, conforming to this standard, containing between 66 % and 80 % by mass of granulated blast 
furnace slag (S), of strength class 32.5 with an ordinary early strength and a low heat of hydration and sulphate 
resisting is designated  by: 
Blast furnace cement DUS  310-1 – CEM III/B 32.5 N - -LH/SR 
EXAMPLE 6 :  
Portland cement, conforming to this standard, of strength class 42.5 with high early strength and sulphate resisting with 
C3A content of the clinker ≤ 3 % by mass is designated by: 
Portland cement DUS - 310- 1 – CEM I 42.5 R –  SR3 
EXAMPLE 7 :  
Pozzolanic cement, conforming to this standard, containing between 21 % and 35 % by mass of natural pozzolana (P), 
of strength class 6 with an ordinary early strength and sulphate resisting with C 3A content of the clinker ≤ 9 % by mass 
and meeting the requirement for pozzolanicity is designated by: 
Pozzolanic cement DUS 310- 1 – CEM IV/A (P) 32.5 N – SR 
EXAMPLE 8 :  
Blast furnace cement, conforming to this standard containing between 81 % and 95 % by mass granulated blast 
furnace slag (S) of strength class 32.5, with low early strength and low hydration and sulphate resisting is designated 
By: 
Blast furnace cement, DUS  310-1 – CEM III/C 32.5 L – LH/SR 
EXAMPLE 9 :  
Portland cement, conforming to this standard of strength class 42.5 with high early strength and where the factory 
produces different cements complying with the same standard designation, is designated by: 
Portland cement DUS  310- 1 – CEM I 42.5 R (1) PUBLIC REVIEW DRAFT20 © UNBS 2016  – All rights reserved  
 9 Conformity criteria  
9.1 General requirements 
Conformity of the 27 products to this standard shall be continually evaluated on the basis of testing of spot 
samples. The properties, test methods and the minimum testing frequencies for the autocontrol testing by 
the manufacturer are specified in Table 6. Concerning testing frequencies for cement not being dispatched 
continuously and other details, see DUS 310 –2. Alternative test methods could be used provided that they 
have been validated in accordance with the appropriate provision in the cited standards of the reference 
test methods. In the event of a dispute, only the reference methods are used. 
For certification of conformity by an approved certification body, conformity of cement with this standard 
shall be evaluated in accordance with DUS 310– 2.  
NOTE 1 This standard does not deal with acceptance inspection at delivery.  
NOTE 2 For certification of conformity by a notified body, conformity of cement with this standard is evaluated in 
accordance with DUS  310-2.  
The compliance of common cements with the requirements of this standard and with the stated values 
(including classes) shall be demonstrated by: 
– Initial type testing; and 
– Factory production control by the manufacturer, including product assessment. 
Table 6 — Properties, test methods and minimum testing frequencies for the autocontrol testing by 
the manufacturer, and the statistical assessment procedure 
   Autocontrol testing  
Property  Cements to 
be tested  Test 
methoda) b) Minimum testing 
frequency  Statistical assessment 
procedure  
Routine 
situation  Initial 
period for a 
new type of 
cement  Inspection by  
Variables e) Attributes  
1 2 3 4 5 6 7 
Early strength 
Standard 
strength  All FDU 100–1 2/week  4/week  X – 
Initial setting 
time All DUS  100–3 2/week  4/week  – Xd) 
Soundness 
(Expansion)  All DUS  100–3 1/week  4/week  – X 
Loss on ignition  CEM I, CEM 
III DUS  100–2 2/month
e) 1/week  – Xd) 
Insoluble residue  CEM I, CEM 
III DUS  100–2 2/month
e) 1/week  – Xd) 
Sulphate con tent All DUS  100–2 2/week 4/week  – Xd) 
Chloride content  All DUS  100–2 2/month
e) 1/week  – Xd) 
C3A in clinker) CEM I -SR 0  DUS  100-2g 2/ month  1/week   xd PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  21 
 CEM I -SR 3  
CEM – SR 5  
CEM IV/A -SR 
CEM IV/B -SR -h     
Pozzolanicity  CEM IV  DUS  100–5 2/month  1/week  – X 
Heat of hydration  Low heat 
common 
cements  DUS  100-8 
 1/month  1/week   xd 
Composition  All –i) 1/month  1/week  –  
a) Where allowed in the relevant part of DUS  100, other methods than those indicated may be used provided they give 
results correlated and e quivalent to those obtained with reference method.  
b) The methods used to take and prepare samples shall be in accordance with DUS  100–7. 
c) If the data are not normally distributed then the method of assessment may be decided on a case -by-case -basis.  
d) If the number of samples is at least one per week during the control period, the assessment may be made by variables.  
e) When none of the test results within a period of 12 months exceeds 50 % of the characteristic value the frequency may 
be reduced to one per month.  
g)In the specific case of CEM I, it is permissible to calculate the C 3A content of clinker from the chemical analysis of the 
cement. The C 3A content shall be calculated by the formula: C 3A= 2.65 A -1.69 F ( see 5.2.1).  
h) Until the test method is  finalized the C 3A content clinker (see 5.2.1) shall be determined on the basis of the analysis of 
clinker as part of the manufacturer’s Factory Production Control ( DUS  310-2, 4.2.1.2)  
i) Appropriate test method chosen by the manufacturer.  
 
9.2 Conformity criteria for mechanical, physical and chemical properties and evaluation 
procedure  
9.2.1  General  
Conformity of cement with the requirements for mechanical, physical and chemical properties in this 
standard is assumed if the conformity criteria specified in 9.2.2 and 9.2.3 are met. Conformity shall be 
evaluated on the basis of continual sampling using spot samples taken at the point of release and on the 
basis of the test results obtained on all autocontrol samples taken during the control period.  
9.2.2  Statistical conformity criteria  
9.2.2.1 General  
Conformity shall be formulated in terms of a statistical criterion based on:  
a) the specified characteristic values for mechanical, physical and chemical properties as given in 
7.1, 7.2 and 7.3 of this standard ;  
b) the percentile Pk, on which the specified characteristic value is based, as given in Table 7;  
the allowable probability of acceptance CR, as given in Table 7. PUBLIC REVIEW DRAFT22 © UNBS 2016  – All rights reserved  
 Table 7 — Required values Pk and CR  
 Mechanical requirements  Physical and 
chemical 
requirem ents Early and standard strength  
(lower limit)  Standard strength  
(upper limit)  
The percentile Pk on which the 
characteristic value is based  5 % 10 %  
Allowable probability of 
acceptance CR  5 % 
 
NOTE Conformity evaluation by a procedure based on a finite number of test results can only produce 
an approximate value for the proportion of results outside the specified characteristic value in a population. 
The larger the sample size (number of test results), the better the approximation. The selected probability 
of acceptance CR controls the degree of approximation by the sampling plan.  
Conformity with the requirements of this standard shall be verified either by variables or by attributes, as 
described in 9.2.2.2 and 9.2.2.3 as specified in Table 6.  
The control period shall be 12 months.  
9.2.2.2 Inspection by variables  
For this inspection the test results are assumed to be normally distributed. Conformity is verified when 
equation(s) (2) and (3), as relevant, are satisfied: 
LskxA
 (2) 
and;  
UskxA
 (3) 
where 
x
 is the arithmetic mean of the totality of the autocontrol test results in the control period;  
s is the standard deviation of the totality of the autocontrol test results in the control period;  
kA is the acceptability constant;  
L is the specified lower limit given in Table 3 referred to in 7.1;  
U is the specified upper limit given in Tables 3 and 4 referred to in clause 7.  
The acceptability constant kA depends on the percentile P k on which the characteristic value is based, on 
the allowable probability of acceptance CR and on the number n of the test results. Values of kA are listed 
in Table 8. PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  23 
 Table 8 — Acceptability constant kA 
Number of test results n kA a) 
For Pk= 5 %  For Pk =10 %  
(early and standard strength, 
lower limit)  (other properties)  
20 - 21 2.40 1.93 
22 - 23 2.35 1.89 
24 - 25 2.31 1.85 
26 - 27 2.27 1.82 
28 -29 2.24 1.80 
30 - 34 2.22 1.78 
35 - 39 2.17 1.73 
40 - 44 2.13 1.70 
45 - 49 2.09 1.67 
50 - 59 2.07 1.65 
60 -69 2.02 1.61 
70- 79 1.99 1.58 
80 - 89 1.97 1.56 
90 - 99 1.94 1.54 
100 - 149 1.93 1.53 
150 - 199 1.87 1.48 
200 - 299 1.84 1.45 
300 - 399 1.80 1.42 
> 400  1.78 1.40 
NOTE  Values given in this table are valid for CR = 5 %.  
a Values of k A valid for interm ediate values of n may also be used.  
 
9.2.2.3 Inspection by attributes  
The number c D of test results outside the characteristic value shall be counted and compared with an 
acceptable number c A, calculated from the number n of autocontrol test results and the percentile Pk as 
specified in Table 7.  
Conformity is verified when equation (4) is satisfied:  
cD  cA  (4)  
The value of C A depends on the percentile Pk on which the characteristic value is based, on the allowable 
probability of acceptance CR and on a number n of the test results. Values of C A are listed in Table 9.  PUBLIC REVIEW DRAFT24 © UNBS 2016  – All rights reserved  
 Table 9 — Values of C A 
Number of test results n a) cA for PK = 10 %  
20- 39 0 
40 -54 1 
55 - 69 2 
70 - 84 3 
85 - 99 4 
100 - 109 5 
110 - 123 6 
124 - 136 7 
NOTE  Values given in thi s table are valid for CR = 5 %  
a) If the number of test results is n < 20 (for Pk = 10 %) a statistically based conformity criterion is not possible. 
Despite this, a criterion of c A = 0 shall be used in cases where n < 20.  If the number of test results is n > 136, 
CA can be calculated as follows: C A = 0.075 (n -30) 
 
9.2.3  Single result conformity criteria  
In addition to the statistical conformity criteria, conformity of test results to the requirements of this 
standard requires that it shall be verified that each test result remains within the single result limit values 
specified in Table 10. 
Table10 — Limit values for  single results 
Property   
Strength class  
32.5 
L 32.5
N 32.5
R 42.5
L 42.5
N 42.5
R 52.5
L 52.5
N 52.5
R 
Early strength (MPa) 
lower limit value  2 days - – 8.0  8.0 18.0 8.0 18.0 28.0 
7 days  10.0 14.0 –  – – - – – 
Standard strength (MPa) 
lower limit value  28 days  30.0 40.0 50.0 
Initial setting time (min) lower limit value  60 50 40 
Soundness (expansion, mm) upper limit 
value  10 
Sulphate content  
(as % SO 3) 
upper limit value  CEM I  
- 4.0 - 4.0 4.5 - 4.5 CEM II a) 
CEM IV  
CEM V  
CEM I -SR 0  
CEM I -SR 3  
CEM I -SR 5b) 
CEM IV/A -SR 
CEM IV/B -SR - 3.5 - 3.5 4.0  4.0 
CEM III/A  
CEM III/B  4.5 PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  25 
 CEM III/C  5.0 
C3A(%).  
Upper limit value  CEM I -SR 0  1 
CEM I -SR 3  4 
CEM I -SR 5  6 
CEM IV/A -SR 10 
CEM IV/B -SR 10 
Chloride content (%) c) upper limit value  0.10d) 
Pozzolanicity  - Satisfies the 
test at 15 
days  - Satisfies 
the test 
at 15 
days  - Satisfies the test at 
15 days  
Heat of hydratio n 
(J/g).  
Upper limit value  LH 300 
a) Cement types CEM II/B – T and CEM II/B -M with a T content > 20% may contain up to 5.0 % SO 3 for all strength classes.  
b) For specific applications CEM I -SR 5 may be produced according to a higher maximum sulphate cont ent (see Table 7). If so, the 
upper limit value is 0.5 % above the declared value  
C) Cement type CEM III may contain more than 0.10 % chloride but in that case the maximum chloride content shall be declared.  
d )For pre –stressing applications cements may b e produced according to a lower requirement. If so, the value of 0.10 % shall be 
replaced by this lower value, which shall be stated in the delivery note.  
 
9.3 Conformity criteria for cement composition  
At least once per month the composition of the cement shall be checked by the manufacturer, using as a 
rule a spot sample taken at the point of release of the cement. The cement composition shall meet the 
requirements specified in Table 1. The limiting quantities of the main constituents specified in Table 1 are 
reference values to be met by the average composition calculated from the spot samples taken in the 
control period. For single results, maximum deviations of –2 at the lower and +2 at the higher reference 
value are allowed. Suitable procedures during production and appropriate verification methods to ensure 
conformity to this requirement shall be applied and documented.  
9.4 Conformity criteria for properties of the cement constituents  
The cement constituents shall meet the requirements specified in Clause 5. Suitable procedures during 
production to ensure conformity with this requirement shall be applied and documented.  
10 Marking, labelling, packaging and storage 
10.1 Marking and labelling 
Each bag of cement shall be legibly and indelibly marked with the following information in English 
language: 
a) the manufacturer’s name, address, (factory physical address)and/or trademark;  
b) standard designation of cement; 
c) net weight of cement in kilograms; PUBLIC REVIEW DRAFT26 © UNBS 2016  – All rights reserved  
 d) date of packing and/or batch number 
10.2 Packaging and stor age 
10.2.1  The cement shall be packaged in a material that safeguards the quality, safety and integrity of the 
product.  
10.2.2  The cement shall be stored in dry and cool place that allows easy access for inspection and 
identification, and in suitable waterproof building to maintain quality of the cement. It shall be stored on 
pallets not in contact with the walls / floors and roof. 
10 Marking, labelling, packaging and storage 
10.1 Marking and labelling 
Each bag of cement shall be legibly and indelibly marked with the following information in English 
language: 
a) the manufacturer’s name, address, (factory physical address)and/or trademark;  
b) standard designation of cement; 
c) net weight of cement in kilograms; 
d) date of packing and/or batch number 
10.2 Packaging and storage 
10.2.1 The cement shall be packaged in a material that safeguards the quality, safety and integrity of the 
product.  
10.2.2 The cement shall be stored in dry and cool place that allows easy access for inspection and 
identification, and in suitable waterproof building to maintain quality of the cement. It shall be stored on 
pallets not in contact with the walls / floors and roof. 
 PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  27 
 Annex A 
(normative)  
 
List of common cements considered as sulphate resisting in EAC 
member states but not included in table 2 
CEM Cement type  
II/A-S, 
II/B-S, 
II/A-V, 
II/B-V, 
II/A-M, 
II/A-D, 
II/A, 
V/A(S -V), 
II/A-P, 
II/A-M(S-V), 
III/A, 
V/A, 
V/B, 
II/A-R, 
II/A-LL, 
II/B-L, 
II/B-LL, 
II/A-W, 
II/B-P, 
II/B-W, 
II/B-T, 
IV/A,  
IV/A,  
IV/B,  
II/B-M(D,V,S,T,LL),  
IV/A(V)  
 
. PUBLIC REVIEW DRAFT28 © UNBS 2016  – All rights reserved  
 Bibliography 
[1] 197-1: 2011; Cement – Part 1; Composition, specifications and conformity criteria for common cements   
 PUBLIC REVIEW DRAFTDUS  310-1 : 2016  
© UNBS 2016  – All rights reserved  29 
 Certification marking 
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 
 PUBLIC REVIEW DRAFTDUS  310-1: 2016    
 
ICS nn.nnn.nn  
Price based on nn pages 
© UNBS 2016 – All rights reserved