Description
Ground tire rubber (GTR) produced from scrap tires has great potentials in using with asphalt binder. The objective of this study is to evaluate the moisture resistance of GTR-modified asphalt binders by a surface science approach named the Sessile Drop method. A performance grade (PG) binder, namely, PG 64-22, modified with different dosages (10%, 15%, and 20%) of GTR was evaluated in this study. Surface Free Energy (SFE) data of five different aggregates, (sandstone, gravel, granite, basalt and limestone) was considered for compatibility analyses. It is seen that the addition of GTR increases the SFE components, and cohesive energy. The work of adhesion between aggregates and GTR-modified binder increases notably in absence of water, but it decreases slightly in presence of water. In general, an addition of GTR increases the compatibility, an indicator of improved moisture resistance, between aggregate and binder.
