| 摘要 |
PROBLEM TO BE SOLVED: To provide a test method for precisely securing particles of aggregate so as to be good in repeatability and have little difference between individuals. SOLUTION: The method for testing the particle quantity of the aggregate by using sifters, includes: a washing step of applying an ultrasonic washing operation to a washing medium containing the aggregate; and the step of bringing a sifter which has a prescribed opening size, to be overlapped by another sifter which has an opening size larger than the above sifter, after the washing operation, and then putting the operated washing medium on the sifters and removing a portion passing through the sifters. In the method, the washing step and the subsequent step of removing the portion passing through the sifters are repeated until any portion passing through the sifter which has the prescribed opening size, cannot observed visually, and then the washing medium is removed from the washing operated sample, thereby obtaining a constant weight to calculate the particle quantity. COPYRIGHT: (C)2010,JPO&INPIT
|
