IS 4925 -1968 Code Book PDF free download

IS 4925 -1968 Code Book PDF free download


This Indian Standard was adopted by the Indian Standards i Institution on 14 December 1968, after the draft. finalized by the Construct titre Lit:~ I and Machinery Sectional Committee had been approved by- lac Cl:;ii Engineering Division Council. On large works where considerable quantity of concrete is !.quirt<::d. central batching plants or batching and mixing plants arc ~Cinerama) used. The plant is erected in a suitable central position and either the mixed concrete is directly transported from it to the working sites, or the dry aggregates or dry mix of concrete is delivered to site mixers. These plants are usually specially designed to suit the local conditions and the output required. Small plants may have an output of as low as 30 m of mixed concrete per hour, medium plants may have the output in the range of 100 to 300 m of mixed concrete per hour and large plants may have an output of over 300 m 3 of mixed concrete per hour., The plants may be manually controlled, semi-automatic or fully automatic ( see 5.1 ). The composition of the plant may also vary depending upon the type and composition of aggregates, cement, admixtures for concrete, and various other requirements, such as temperate control of aggregates, mixing water and concrete and above all t 11 c quality of concrete expected from the plant. This performance oriented specification lays down general requirements and guide lines for medium and large size centralized belching plants with the object of providing guidance to prospective users and manufacturers and for guiding the purchaser in covering all the requisite technical points in the inquiry or tender notice, and to define the same more precisely while placing the order on the manufacturer. With suitable modifications, the specification may also be used for small plants. In view of intricate nature of’ such plants and of the variety of combination of ancillary equipment that may be required under different conditions, information on many aspects may have to be supplied both by the user for the guidance of the manufacturer and by the manufacturer to the prospective user, to obtain a true comparative assessment of different plants available and to ensure that the plant selected is suited to the conditions prevailing. For this reason, the specification contains clauses which call for agreement between the purchaser and the supplier and which permit the purchaser to use ,his option for selection to suit his requirements. These clauses are 3.1, 3.1.1, 3.2, 4.2, 5.4, 5.6, 6.5, 7.2, 6.2 and 9.1. 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: 2-1960*. 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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