Attrition Test on Stones
Aim of Attrition Test on Stones
This attrition test is conducted to determine the resistance power of stone against the grinding action. This test is mainly conducted to find out the suitability of a particular action.
This test is mainly conducted to find out the suitability of a particular stone for road construction.
Procedure of Attrition Test on Stones
For the attrition test, 5 kg of broken angular pieces of stones is placed in both the cylinders of Deval’s attrition testing machine. The cylinders are kept in an inclined position such that their axis makes an angle of 30 degrees with the horizontal.
Now, the cylinders are rotated at the rate of 30 r.p.m (Revolution per minute) for 5 Hours.
Later on, these pieces are removed from the cylinders and passed through a 1.5 mm sieve. The quantity of stones pieces retained on the sieve is weighed. And by this.
The Loss of weight of the sample can be calculated. The percentage of wear can be calculated as
Stones which should have a greater percentage of wear are unsuitable for road construction.