Effect of hydrated lime and organosilane based adhesion promoters on performance of bituminous concrete mixes

Abstract

This study emphasis on determining the tensile strength ratio (TSR) of bituminous concrete (BC) mixes to check their moisture susceptibility. Two types of bitumen VG30 and CRMB55 were used for preparing the BC mixes. Indirect tensile strength (ITS) test was performed as per AASHTO T283 standard on BC mixes. BC mixes were subjected to multiple freeze-thaw cycles to examine the effect of increased adverse conditions. It was noticed that BC mixes prepared with VG30 bitumen failed to meet the 80% TSR value criteria. However, BC mixes prepared with CRMB55 bitumen exhibited superior resistance to moisture damage. Hydrated lime and organosilane based adhesion promoter (OSAP) has been used as anti-stripping agents (ASAs) to increase the resistance of BC mixes to moisture damage in this study. The results show that hydrated lime and organosilane based adhesion promoter enhances the performance of BC mixes for multiple freeze-thaw cycles also. The potential of data mining techniques like regression technique for predicting the tensile strength ratio (TSR) have also been explored for developing model for the same.