Mechanical Properties of Unbound Limestone Aggregates Replaced by Recycled Glass Aggregate for Pavement in Canada/Quebec

Abstract

This study investigated the use of recycled glass aggregate (RG) as unbound base/subbase material. The experimental tests included compaction, Los Angeles (LA), Micro-Deval, and California bearing ratio (CBR) tests. In this regard, fine proportion of course limestone aggregate (MG20) was replaced by RG with size ranging from 0 to 5 mm based on volumetric method. Adding RG to the coarse aggregate improved durability in wet conditions, which is more representative of the field condition of Canada/Quebec, but decreased in dry conditions. CBR values decreased with increasing RG inclusion, but all blends with 0-100% RG in the fine fraction of MG20 met minimum requirements for unbound granular layers in Quebec. A simple model predicting the resilient modulus values of these materials based on CBR values at different stress levels was suggested. This equation estimates Mr values of various aggregate-RG blends under a wide range of mean stress based on their CBR values.