Testing Mineral Filler From Hot Plants

Usually the mineral filler of a hot plant will be relatively constant in gradation.  However, occasionally you may need to test the gradation if you make any changes to the dust collection or distribution system.  In California there is no special test method for testing the gradation of mineral filler and it is tested using CT 202.  This test method requires a sample size of 500g for typical fine aggregate samples BUT if less than 10% of the sample is retained on the #30 sieve (as most mineral fillers commonly are), a sample size of 125g can be used instead.  This reduces the amount of time needed to wash out the materials passing the #200 sieve and allows for a quick and efficient test.  The rest of the test method remains the same.