The dilative behaviour of a number of crushed rock samples tested in large triaxial apparatus under different confining pressures is reviewed and the dependency of dilatancy angle on material characteristics and test condition is studied.

Abrasion and point load tests were also carried out to evaluate hardness and compressive strength of the aggregate. An IS50–dependent correlation for dilatancy angle has been developed.

It was noted that under low confining pressures samples from various sources exhibited different extends of dilation. Crushed rock samples with higher grain hardness exhibited greater dilatancy under equal confining pressures.