The grading of fine aggregates as specified by IS : 2386 -1965 , ( part I ) are given in Table 15.8 below . ISI has specified fine aggregates grading into four zones , namely zone 1,2,3,and 4 . Where the grading falls outside the limits of any particular zone of sieves other than 600 mic by a total amount not exceeding 5 percent it should be regarded as falling within that grading zone .
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