WHAT IS THE GRADING LIMITS FOR COARSE AGGREGATES?

The grading of coarse aggregate may be varied through wider limits than that of fine aggregates, since it does not affect the workability, uniformity and finishing qualities of concrete mix. As per IS-383 the grading limit of coarse aggregate, both for single size as well as graded should be as per the table given below.

Grading Limit

Grading Limits For Single-Sized Aggregate of Nominal Size

Sieve Size (mm) 63 mm 40 mm 20 mm 16 mm 12.5 mm 10 mm
(Percentage of Passing)
80 100
63 85 to 100 100
40 0 to 30 85 to 100 100
20 0 to 5 0 to 20 85 to 100 100
16 85 to 100 100
12.5 85 to 100 100
10 0 to 5 0 to 5 0 to 20 0 to 30 0 to 45 85 to 100
4.75 0 to 5 0 to 5 0 to 10 0 to 20
2.36 0 to 5

 

Grading Limits For Graded Aggregate of Nominal Size

Sieve Size (mm) 40 mm 20 mm 16 mm 12.5 mm
(Percentage of Passing)
80 100
63
40 95 to 100 100
20 30 to 70 95 to 100 100 100
16 90 to 100
12.5 90 to 100
10 10 to 35 25 to 55 30 to 70 40 to 85
4.75 0 to 5 0 to 10 0 to 10 0 to 10
2.36

Grading Limit2

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