IS 383 -1970 Code Book PDF free download
This Indian Standard (Second Revision) was adopted by the Indian Standards Institution on 25 September 1970, 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 1952 and subsequently revised in 1963. The present revision of the standard has been taken up to incorporate the modification necessary in the light of experience gained in its use and also to bring it in line with the latest thinking on the subject. The requirements for aggregates for mass concrete have been included and it is proposed to withdraw IS: 515-1959*when this standard is printed. The limiting values for the permissible deleterious materials in the aggregates, aggregate abrasion value and soundness test for aggregates have been revised, Recommendations have been included for the size of aggregates for mass concrete. The four grading zones for fine aggregates as specified in the earlier version of the standard have not been changed. These four grading zones become progressively finer from Grading Zone I to Grading Zone IV (see Table 4). The fine aggregates within each of these grading zones are suitable for making concrete, but to make concrete of high strength and durability, the mix proportions should be c!biosensor according to the grading characteristics of the fine aggregates used; the ratio of fine to coarse aggregate being reduced as the fine aggregate becomes finer from Grading Zones I to IV. In particular, the correct design of the mix becomes increasingly important as the grading of the fine aggregate approaches the coarse outer limit.of Grading Zone I or the fine outer limit of Grading Zone IV, and the suitability of a given fine aggregate grading may, in some circumstances, depend on the grading and shape of the coarse aggregate. It is sometimes found that a fine aggregate which lies in one grading zone and near the border of another does not remain consistently in one zone but fluctuates between the two. It is therefore, desirable to choose a suitable ratio of fine to coarse aggregate proportions of the concrete to allow some fluctuations in the grading zone of the Abe aggregate 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 : Z-1960. The number of significant places retained in the rounded off value should be the same LU that of the specified value in this standard.
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