ASTM C786/C786M-17 PDF Download

ASTM C786/C786M-17 is a standard test method that outlines wet sieving techniques for determining the fineness of hydraulic cement and raw materials using three different sieve sizes: 300-µm (No. 50), 150-µm (No. 100), and 75-µm (No. 200).

The standard describes the apparatus required for the test, including wet test sieves, a spray nozzle, pressure gage, balance, weights, brush, dry test sieves, and NBS SRM No. 1004 (glass bead standard). It also provides guidelines for standardization of the dry sieve and calibration of the wet sieve.

The procedure involves weighing the sample and transferring it quantitatively to a clean dry sieve. The sample is then wetted thoroughly with a gentle stream of water and the sieve is washed and rinsed. After drying the sieve and residue, the residue is brushed off and the sieve is weighed on a balance.

The standard also includes an abstract that provides a brief overview of the test method, emphasizing its focus on wet sieving techniques for determining the fineness of hydraulic cement and raw materials using the specified sieve sizes.