Of practice for plain and reinforced concrete for

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Unformatted text preview: RNACE SLAG CEMENT ‡IS : 456-1957 CODE OF PRACTICE FOR PLAIN AND REINFORCED CONCRETE FOR GENERAL BUILDING CONSTRUCTION ( Revised ) *IS : 460-1953 SPECIFICATION FOR TEST SIEVES 0.4.1 Wherever a reference to any standard mentioned in 0.4, except IS : 460-1953, appears in this standard, it shall be taken as a reference to the latest version of the standard. 0.5 In pursuance of the decision of the Government of India to introduce a uniform system of weights and measures throughout the country based on the metric system, in this standard, all dimensions and values have been given in metric units only. It is hoped that this step will facilitate the change-over to the metric system by the industry more expeditiously. 0.6 This edition 1.2 incorporates Amendment No. 2 (July 1991). Side bar indicates modification of the text as the result of incorporation of the amendment. 0.7 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with *IS : 2-1949 Rules for Rounding Off Numerical Values. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 0.8 This standard is intended chiefly to cover the technical provisions relating to the testing of concrete, and it does not include all the necessary provisions of a contract. 1. SCOPE 1.1 This standard covers tests for the determination of compressive strength, flexural strength and modulus of elasticity of cement concrete. 2. MAKING AND CURING COMPRESSION TEST SPECIMENS IN THE LABORATORY 2.1 This clause specifies the procedure for making and curing compression test specimens of concrete in the laboratory where accurate control of the quantities of materials and test conditions are possible and where the maximum nominal size of aggregate does not exceed 38 mm. The method is specially applicable to the making of preliminary compression tests to ascertain the suitability of the available materials or to determine suitable mix proportions. *Since revised. †Second revision issued in 1967. ‡Second revision issued in 1964. 4 IS : 516 - 1959 2.2 Sampling of Materials — Representative samples of the materials of concrete for use in the particular concrete construction work shall be obtained by careful sampling. Test samples of cement shall be made up of a small portion taken from each of a number of bags on the site. Test samples of aggregate shall be taken from larger lots by quartering. 2.3 Preparation of Materials — All materials shall be brought to room temperature, preferably 27° ± 3°C before commencing the tests. The cement samples, on arrival at the laboratory, shall be thoroughly mixed dry either by hand or in a suitable mixer in such a manner as to ensure the greatest possible blending and uniformity in the material, care being taken to avoid the intrusion of foreign mat...
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This document was uploaded on 10/01/2013.

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