Attrition Test on Building Stone

1 Attrition Test:

This test is done to determine the resistance of stone to abrasive forces. The results of the test indicate the resisting power of stones against the grinding action under traffic. The Attrition test is carried out in Devel’s Attrition testing Machine.

The following procedure is adopted:

• ·         Samples of stones are broken into pieces about 60mm size.
• ·         Such Sample, weighing 5kg is put in both the cylinders of “Devil’s attrition test machine”.
• ·         Diameter and length of cylinder are  20cm and 34cm.
• ·         Cylinders are closed. Their axes make an angle of 30 degree with the horizontal.
• ·         Cylinders are rotated about the horizontal axis for 5 hours at the rate of 30 RPM.
• ·          After this period, the contents are taken out from the cylinders and they are passed through a sieve of 1.5mm mesh.

·         Quality of material which is retained on the sieve is weighed.

Percentage wear worked out as follows: