Why do we test aggregates retained between 10 mm and 12.5

Dnyan Deshmukh

Staff member
There are many physical and Mechanical tests on aggregates performed as per IS code provision (See IS 383 for Test Requirement and follow the specified code for testing procedure) which specifies the size of the aggregate to be used for doing the test in which one of the criteria is aggregate passing from 12.5 mm IS sieve and Retaining on 10 mm IS Sieve.

This particular size of aggregate is used to check the shape factor which are elongation and flakiness index of the aggregate.

This particular size of aggregate is also use in determining the mechanical properties of the aggregates such as
Crushing Value
Impact Value
Abrasion Value etc.

You can learn more about same by reading IS 383 and relevant IS 2386 parts for specified test.