To5 95 to 100 25 to 55 otolo 100 9oto100 30to70 oto10

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Unformatted text preview: m+ 80 mm 90 to 100 Oto IO Large, 80 to 40 mm 80 mm 41) mm 90 to 100 Oto 10 Medium, 4Omm 20 mm 90 to 100 Oto 10 20 mm 4.75 mm 2136 mm 9O‘to 100 Oto 10 Oto 2 40 to 20 mm Small, 20 to 4.75 mm *There complying 5. being no IS Skzve having an aperture larger than 100 mm a perforated plate with IS : 2405-1963 and having a square aperture of 160 mm may be used. SAMPLING AND TESTING 5.1 Sampling-The method of sampling shall be in accordance with IS : 2430-1969. The amount of material required for each test shall be as specified in the relevant method of test given in IS : 2386 (Part I)-1963 to IS : 2386 ( Part VIII )-1963. 5.2 All tests shall be carried out as described in IS:2386 (Part I)-1963 Unless otherwise stated in the enquiry or to IS : 2386 (Part VIII)-1963. order, duplicate tests shall be made in all cases and the results of both tests reported. 5.2.1 In the case of all-in-aggregates, for purposes of tests to verify its compliance with the requirements given in Table 1, and when necessary for such other tests as required by the purchaser, the aggregates shall be first separated into two fractions, one finer than 4*75-mm IS Sieve and the other coarser than 4*75-mm IS Sieve, and the appropriate tests shall be made on samples from each component, the former being tested as fine aggregate and the latter as coarse aggregate. 5.2.2 If further confirmation as to the satisfactory nature of an aggregate is required, tests may be made in accordance with 2 and 5 of IS : 516-1959 with a view to comparing the properties of the concrete made with the aggregate under consideration with those of concrete made with an- aggregate of known quality. 10 IS : 303 -1970 TABLE 4 FINE AGGREGATES’ ( Clause 4.3 ) IS SIEVE DESIGNATION PERCENTACK r--- _____ PASSINQ FOR .-.-----~ ---__--___h------- Grading zone I GradinS Zone 11 Grading Zone IV Grading Zone III 10 mm 100 100 4.75 mm 90-100 90-100 90-100 95-100 2.36 mm 60-95 75-100 85-100 95-100 1.18 mm 30-70 55-90 75-100 90-100 600 micron 15-34 35-59 60-79 80-100 300 micron 5-20 8-30 12-40 15-50 150 micron O-10 O-10 O-10 o-15 100 100 NOW b--For crushed stone sands, the dermissible limit on 150-micron IS Sieve is increased to 20 percent. This does not affect the 5 percent allowance permitted in 4.3 applymg to other sieve sizes. NOTE 2Fine aggregate complying with the requirements of any grading zone in this table is &table for concrete but the quality of concrete produced will depend upon a number of factors including proportions. Nc)TI’: 3 - Where concrete of high strength and good durability is required, line aggregate conforming to any one of the four grading zones may be used, but the concrete mix should be properly designed. AS the ne aggregate grading be&mea progressively finer, that is, from Grading Zones I to I $ the ratio of fine aggregate to coarse aggregate should be progressively reduced. Tie most suitable fine to coarse ratio to be used for any particular mix will, howevQer, depend upon the actual gi...
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This document was uploaded on 10/01/2013.

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