Influence of Laboratory Compaction Methods on Shear Performance of Graded Crushed Stone

Abstract

This paper presents a study on the effects of two laboratory compaction methods, namely, vibrating compaction and modified Proctor compaction on the stress-strain characteristics and shear strength of graded crushed stone. The results of the triaxial shear test show that samples made by vibrating compaction possess higher peak strength, higher initial modulus of elasticity, and lower failure strain than samples made by the modified proctor compaction. Specifically, the cohesion, friction angle, and shear strength of the samples made by the vibrating compaction increase by 38%, 2 degrees, and 10%, respectively, over the samples made by the modified Proctor compaction. In summary, the vibrating compaction method generally performs better than the modified Proctor compaction method, owing to a better distribution of particle orientation. Therefore, it is recommended that, in practice, the vibrating roller should be applied for the construction of graded crushed stone.