Rock Crusher Frequently Asked Questions - Air Permitting for .Opacity is measured in percentages and is performed by a certified technician using visible observation. Crushing activity.how to crush a rock to perform testing,How to check quality of crushed sand to be used in concrete?Poor quality of crushed sand will affect workability, cement demand, strength .. sp. gravity, bulking of sand and test for impurities can be performed to check its . quality of crushed basically depends on quality of rock and crushing method.
how to crush a rock to perform testing