This is also called the abrasion test. This test is performed to determine the percentage of the wear of stones that are used for road construction. This test is carried out in Deval’s Attrition Testing Machine.
In this test, a certain quantity of stone is placed on Deval’s Attrition cylinder. The cylinder is rotated about its horizontal axis at the rate of 30 rpm for 5 hours. After the end of rotation, the contents of the cylinder are sieved, and the quantity of material retained on the stone is weighed. The percentage weight is the ratio of loss in weight to the initial weight which is expressed as a percentage.
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