Standard Specification (Coarse and Fine Aggregates From Natural Sources For Concrete) Order, 1949.
Statutory Instruments
Source: Statutory Instruments

num: 4
paragraphs: (a) Coarse Aggregate.
(b) Single-sized Coarse Aggregates.
(c) Fine Aggregates.
(i) The grading of a fine aggregate, when analysed as described in Appendix B, shall be within the limits given in Table 3.
(ii) When the fine aggregate is to be used in concrete containing more than 480 lb. of cement per cubic yard of concrete, the limit passing the No. 52 test sieve may be lowered from 10 per cent. to 5 per cent.
(iii) When the fine aggregate is to be used in concrete containing less than 350 lb. of cement per cubic yard of concrete, the limit passing the No. 52 test sieve may be raised from 30 per cent. to 33 per cent.
(iv) Fine aggregate containing less than 10 per cent. of material passing the No. 52 test sieve may be used provided an approved satisfactory inorganic material is added to correct the deficiency in grading.
(v) A fine aggregate intended for use in medium and lean concrete shall contain not less than 2 per cent. of material passing the No. 100 test sieve.
(vi) In order to control the grading of fine aggregate from any one source a preliminary sample shall be submitted before actual deliveries are made. This sample shall be representative of the material which it is proposed to supply. The fineness modulus of this sample and of samples from subsequent consignments shall be determined in the manner described in Appendix B. If the sample from any consignment shows a variation in fineness modulus greater than plus or minus 0-2 from the fineness modulus of the preliminary sample, the consignment shall be rejected or at the option of the purchaser it may be accepted subject to such changes in the proportion of materials as he or his representative may deem necessary by changes in grading of the fine aggregate.
(vii) When fine aggregate consisting of crushed stone sand is to be used in the manufacture of cast concrete products, the limit of material passing the No. 100 test sieve may be raised to 15 per cent.
(d) All-in Aggregates.
(a) by the supplier in the event of the results of the test showing that the material does not comply with the specification,
(b) by the purchaser in the event of the results of the test showing that the material complies with the specification
(i) County.
(ii) Townland.
(iii) Name of Quarry or Pit.
(iv) In the case of material dredged from seas, estuaries or rivers, the precise locality from which the material was taken.
(i) In the case of sampling from stock piles, twelve initial samples of about 1 cwt. each shall be taken from different parts of the stock pile, care being taken to avoid sampling a segregated area of coarse or fine material. These initial samples shall be well mixed together.
(ii) In the case of sampling from bins, six initial samples of about 1 cwt. each shall be taken from the top surface of the bin and a single initial sample of about 6 cwt. from the discharging chute. These initial samples shall be well mixed together.
(iii) When sampling during loading or unloading of a vehicle or boat, twelve initial samples of about 1 cwt. each shall be taken at approximately equal intervals throughout the loading or unloading operation. These initial samples shall be well mixed together.
(a) Three sizes of open-ended mild steel cylinder, with plunger and base plate. The size of cylinder to be used shall depend on the nominal size of aggregate and shall be as given in Table 6. The cylinder with plunger and base plate shall be constructed as indicated in Fig. 1 and shall be of the dimensions given in Table 7.
(b) Straight metal tamping rods of circular cross-section round-nosed at one end and of the appropriate dimensions given in Table 7.
(c) A scale or balance accurate to ±5 g. in the case of samples to be tested in the 12 in. cylinder, ±1 g. for the 6 in. cylinder and ±0.2 g. for the 3 in. cylinder.