IS 4926 -2003 Code Book PDF free download
This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Civil Engineering Division Council. This standard was first published in 1968. The first revision of the standard was brought out in 1976. In the first revision the major modifications included increase in the time limit for supply of ready-mixed concrete by half an hour in order to make the standard more practicable and permitting use of fly ash. This second revision is being brought out to incorporate modifications found necessary based on the experience gained with the use of this standard and specially in the context of recent developments in this field in the couch-y. The significant modifications included are as follows : a) Rationalization of definitions and addition of definitions for more terms. b) Requirements for materials brought in line with IS 456:2000 ‘Plain and reinforced concrete — Code of practice’. c) Minimum testing frequencies introduced for aggregates and water.
d) Basis of supply modified to bring it in line with IS 456:2000 ‘Plain and reinforced concrete — Code of practice’. e) Transportation time made uniform to 2 h. t) Requirement of temperature of concrete deleted. g) Sampling procedure has been modified. h) Tolerance limits for work ability have been modified. j) A clause on non-compliance has been included. k) A detailed clause on production and delivery including plant safety and maintenance and environmental considerations has been included. m) A detain!ed clause on quality control has been included. n) A detailed clause on order processing and training has been included. p) Detailed provisions on calibration and weighing equipment accuracy has been introduced as Annex E. For effective implementation of the provisions of the standard, it maybe desirable that the ready-mixed concrete plants operate their system under a third party certification scheme to ensure operation of a well structured system and to build confidence in the users of such concrete. The composition of the Committee responsible for formulation of this standard is given at Annex H. 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 shall be rounded off in accordance with IS 2:1960 ‘Rules for rounding off numerical values ([email protected]’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
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