Quantifying effect of stress levels on aggregate degradation using an abrasion test in a model rotating drum

Abstract

This paper presents the results of a study of aggregate particle degradation by quantifying changes to aggregate particle shape due to different levels of applied stress. Proof of concept of the experimental system, developed to provide some insights into aggregate degradation solely due to particle-to-particle interaction mechanism is introduced. The aggregate particle degradation process is created within a customised rolling small model drum, in which the aggregate assemblage is subjected to different stress levels created through simulated increased gravitational forces by testing in the geotechnical centrifuge. The aim of this study is to establish consistency of the experimental system with expected results on the influence of stress levels on aggregate degradation. This is achieved through the quantification of the number of generated fines. The determined generated fines show consistency with expected results of the influence of stress level on the degradation of quartzite, fresh and weathered aggregate samples and therefore validating the experimental system.