DRAFT UGANDA STANDARD  
  DUS 156-1 
Second  Edition  
2017 -02-28 
 
 
 Reference number  
DUS 156-1: 2017 
© UNBS 2017   
  
Building limes — Part 1: Specification  
 DUS 156-1: 2017  
ii © UNBS 2017  – All rights reserved  
 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 a pplication  
© UNBS 2017  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 41 4 333 2 50/1/2/3  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  DUS 156-1:2017  
© UNBS 2017  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Classifica tion ................................ ................................ ................................ ................................ .........  1 
5 Requirements  ................................ ................................ ................................ ................................ .........  2 
5.1 Chemical requirements  ................................ ................................ ................................ .........................  2 
5.2 Physical  requirements  ................................ ................................ ................................ ..........................  3 
6 Packing  ................................ ................................ ................................ ................................ ...................  3 
7 Marking  ................................ ................................ ................................ ................................ ...................  4 
8 Storage  ................................ ................................ ................................ ................................ ...................  4 
9 Sampling and criterion for conformity  ................................ ................................ ................................  4 
10 Test methods  ................................ ................................ ................................ ................................ .........  4 
Annex  A (normati ve)  Sampling and Criterion for Conformity  ................................ ................................ ...... 5 
A.1 Samples for testing  ................................ ................................ ................................ ...............................  5 
A.2 Procedures for sampling  ................................ ................................ ................................ ......................  5 
A.2.1  General  ................................ ................................ ................................ ................................ ...................  5 
A.2.2  Sampling  ................................ ................................ ................................ ................................ ................  5 
A.2.3  Material  for physical and chemical tests  ................................ ................................ ............................  6 
A.3 Criterion for conformity  ................................ ................................ ................................ ........................  6 
Bibliography  ................................ ................................ ................................ ................................ ........................  7 
 DUS 156-1: 2017  
iv © UNBS 2017  – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (UNBS) is a p arastatal 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 Comm ittees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key stakeholders 
including government, academia, consumer groups, private sector and other interested parties.  
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 Coun cil. 
The committee responsible for this document is Technical Committee UNBS /TC 03, Building and 
Construction , Subcommittee SC.  
This second  edition cancels and replaces the  first edition ( US 156:1995 ), whic h has been technically revised.  
 DRAFT UGANDA STANDARD  DUS 156-1: 2017  
 
© UNBS 2017  – All rights reserved  1 
 Building l imes — Part 1: Specification  
1 Scope  
This Draft Uganda Standard specifies  requirements for building limes used for construction purpose . 
2 Normative references   
The following referenced documents referred to in the text in such a way that some or all of their co ntent 
constitutes requirements 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.  
US 290 (all parts), Glossary of terms used in l ime products  
3 Terms and definitions  
For the purposes of this document, the terms and definitions given in US 290: 2001 apply.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing plat form: available at http://www.iso.org/obp  
4 Classification  
4.1 Building limes shall be classified as follows:   
Class A - Eminently hydraulic lime used for structural purposes.  
Class B - Semi -hydraulic lime used for masonry mortars, lime concrete and plaste r undercoat.  
Class C - Fatlime used for finishing coat in plastering, white washing, composite mortars, etc, and with 
addition of pozzolanic materials for masonry mortar.  
Class D - Magnesium/dolomitic lime used for finishing coat in plastering, white washi ng, etc.   
Class E - Kankar lime  used for masonry mortars.  
Class F - Siliceous dolomitic lime used for undercoat and finishing coat of plaster.  
NOTE 1  Lime shall be available either in hydrated or quick form, except that of Classes A and E which shall be 
supplied in hydrated form.  
NOTE 2  Applications indicated are only suggestive,   
2 © UNBS 2017  – All rights reserved  
 5 Requirements  
5.1 Chemical requirements  
Building limes shall  conform to the requirements given in the Table 1. 
Table 1 — Chemical requirements for building limes  
SL 
No Character istics  A B C D E F 
Hydra
ted Quick  Hydra
ted Quick  Hydra
ted Quick  Hydra
ted Hydra
ted Quick  Hydrat
ed 
i.  Calcium and magnesium oxides, 
percent, min . ( on ignited basis)  60 70 70 85 85 85 85 50 70 70 
ii.  Magnesium oxid es, 
percent (on ignited 
basis).  max. 6 6 6 6 6 — — 6 — — 
min. — — — — — 6 6 — 6 6 
iii.  Silica, alumina and ferric oxide, 
percent,  min. (on ignited basis)  20 10 10 — — — — 20 10 10 
iv.  Unhydrated magnesium oxide, 
percent, max. ( on ignited basis )  — — — — — 8 8 — 8 8 
v.  Insoluble residue in dilute acid 
and alkali percent, max. (on 
ignited basis)  15 10 10 2 2 2 2 25 10 10 
vi.  Carbon -dioxide, percent,  max. ( 
on oven dry basis )  5 5 5 5 5 5 5 5 5 5 
vii.  Free moisture content, percent, 
max. 2 — 2 — 2 — 2 2 — 2 
viii.  Available lime as CaO, percent, 
min. ( dry basis )  — — — 75 75 — — — — — 
 DUS 156-1: 2017  
© UNBS 2017  – All rights reserved  3 
 5.2 Physical requirements  
Building limes shall conform to  the requirements given in the Table 2.  
Table 2 — Physical requirements for building limes  
SL 
No 
i
i Characteristics  A B C D E F 
Hydrat
ed Quic
k Hydrat
ed Quic
k Hydrat
ed Quic
k Hydrat
ed Hydrat
ed Quic
k Hydrat
ed 
i.  Fineness  a) Residue on 2.36  
mm Sieve percent, 
Max Nil — Nil — Nil — Nil Nil — Nil 
b) Residue on 
300micronSieve 
percent, Max 5 — 5 — Nil — Nil 5 — 5 
c) Residue on 
212micron Sieve 
percent, Max — — — — 10 — 10 — — Nil 
ii.  Resid ue on 
slaking  a) Residue on 
850micron Sieve 
percent, Max — 10 — 5 — 5 — — 10 — 
b) Residue on 
300micron Sieve 
percent, Max — — — 5 — 5 — — — — 
iii.  Setting time  a) Initial set, Min, h 2 — — — — — — 2 — — 
b) Final set, Max, h 48 — — — — — — 48 — — 
iv.  Compressiv
e stren gth, 
Min, N/mm2 a) at 14 d ays 1.75 1.25 1.25 — — — — 1.0 1.25 1.25 
b) at 28 days  2.8 1.75 1.75 — — — — 1.75 1.75 1.75 
v.  Transverse strength at 28 days,  N/mm2, 
Min 0.7 0.7 — — — — 0.7 0.7 0.7 0.7 
vi.  Workability bumps, Max — — — 12 10 12 10 — — — 
vii.  Volume yield ml/g,  Min — — — 1.7 — 1.4 — — — — 
viii.  Soundness, Le Chaterlier expansion 
mm, Max 5 — 5 — — — — 10 — 10 
ix.  Popping & pitting  Free — Free — Free — Free — — Free 
 
6 Packing  
6.1 The hydrated lime shall be supplied, in suitable containers, such as jute bags lined  with polythene or 
high density polythene woven bags lined with polythene or craft paper bags, preferably containing 50 kg of 
lime.  
NOTE  If the hydrated lime can be used within 30 days, use of liner may be dispensed with .  
4 © UNBS 2017  – All rights reserved  
 6.2 The quicklime shall be supplie d in containers like metal container or similar suitable containers 
preferably containing 50 kg of lime.  
7 Marking  
The lime packages shall bear the following : 
a) type and class of lime;  
b) the brand name of manufacturer;  
c) date of manufacture;  
d) the net weight; and  
e) in case of quicklime the slaking temperature shall be indicated.  
8 Storage  
The lime shall be stored in such a manner as to permit easy access for proper inspection and in a suitable 
building to protect the lime from the dampness and to  minimize warehouse d eterioration.  
NOTE  Quicklime deteriorates rapidly and, therefore, should be used as quickly as possible.  
9 Sampling and criterion for conformity  
The procedure of sampling and criterion for conformi ty shall be as given in Annex  A. 
10 Test methods  
For the pu rposes of this document, the test methods are  given in DUS 156 -2: 2017  DUS 156-1: 2017  
© UNBS 2017  – All rights reserved  5 
 Annex  A 
(normative)  
 
Sampling and Criterion f or Conformity   
A.1 Samples for testing  
A.1.1  The samples for testing shall be taken by the purchaser or his representative at the manufactur er's 
works.  
A.2 Procedures for sampling  
A.2.1  General   
Sampling shall be earned out as quickly as possible so that the material does not deteriorate. The total time 
occupied in mixing and quartering down the composite samples, and the preparation of the f inal test samples 
from this shall not exceed two hours. The 'final samples shall be three in number and shall be placed 
immediately in clean, dry and air -tight containers. When testing is not to be carried out at once, the samples 
shall be enclosed, marked  and sealed to the satisfaction of all concerned, paying special attention to the 
airtightness of the containers. Tools and containers shall be of material free from rust and shall be alkali 
resistant.  
A.2.2  Sampling   
From each lot, three final test sample s shall be taken as provided under A -2.2.1 for quicklime and under A -
2.2.2 for hydrated lime.  
A.2.2.1.  Quicklime  
The size of the gross sample for lump quicklime and powdered quicklime from each lot depends on the size of 
the lot and shall be as given in T able 3 and in A-2.2.1.1 and A-2.2.1.2.  
Table 3 — Sample size  
Lot size  Gross sample size for 
lump quick - lime Gross sample size for 
powdered quicklime  
Tonnes  kg kg 
Up to 100  500 250 
101 to 300  1 000 500 
301 to 500  1 500 750 
501 to 1 000 2 000 1 000 
A.2.2.1.1 . When the lump quicklime or powdered quicklime is available -in bulk, the gross sample shall be 
made up of at least 50 equal portions taken from the lot at equal intervals of loading or unloading to make up 
the prescribed gross sample size. For stat ionary lots, the gross sample shall be collected from different parts 
of the stock pile in not less than 50 equal portions. The gross sample collected in the above manner shall be 
thoroughly mixed on a clean dry surface to about 20 kg for lump quicklime an d 10 kg for powdered quicklime 
by coning and quartering    
6 © UNBS 2017  – All rights reserved  
 A.2.2.1.2  When the lump quicklime or powdered quicklime is presented for sampling in packages, at least 
25 percent of the packages shall be opened and equal portions of the material shall be collecte d from different 
parts of the packages to make up the prescribed gross sample size, The gross sample collected in the above 
manner shall be thoroughly mixed on a clean dry surface to about 20 kg for lump quicklime and  10 kg for 
powdered quicklime by coning  and quartering method.  
A.2.2.2  Hydrated  lime  
The final samples, each of not less than 5 kg, shall be taken direct in the same manner as described under A -
2.2.1.1 and A-2.2.1.2 for powdered quicklime.  
A.2.3  Material  for physical and chemical tests   
Subseq uently, at the time and place at which the tests and chemical analysis are to be carried out, the sample 
taken as described under A -2.2.1 and A -2.2.2 shall be crushed to pass through 2.36 mm Sieve and thoroughly 
mixed. Slightly more quantity of lime than i s sufficient for conducting the tests shall be taken. For chemical 
tests only, from the material finally chosen, a small quantity from the sample shall be ground and rejected in 
order to ensure absence of contamination in the grinding equipment; and then  about 100 g of the sample shall 
be rapidly ground with as little exposure to the air and water vapour as possible to pass through 300 micron 
Sieve and placed in a small air -tight container. The remaining quantity shall be used for physical tests.  
A.3 Criter ion for conformity   
A.3.1  The test sample prepared for each lot shall be subjected to various physical and chemical tests. The 
lot shall be declared conforming to this specification only if the sample passes all the prescribed tests.  DUS 156-1: 2017  
© UNBS 2017  – All rights reserved  7 
 Bibliography  
[1] IS 712: Third Edition , Building Limes — Part 1: Specification   
 DUS 156-1: 2017  
© UNBS 2017  – All rights reserved  9 
 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 Ce rtification 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 relevan t 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.  
 
 DUS 156-1: 2017    
 
ICS 91.100.10  
Price base d on nn pages  
© UNBS 2017– All rights reserved