Experimental study to investigate the performance of cold in-place recycling asphalt mixes

Abstract

This research work was performed to study the impact of steel slag and limestone virgin aggregates as a substitution for recycled asphalt pavement (RAP) in cold in-place recycling (CIR) asphalt mixes. An anionic slow-setting (SS-1) emulsion was used to fabricate the specimens. Marshall stability and flow test, dynamic creep test and moisture susceptibility test were performed to evaluate the mechanical performance of the CIR mixes. The results of this research showed that the presence of modifier aggregates leads to an increase of Marshall stability, and a decrease in permanent deformation and moisture susceptibility. Furthermore, the additional aggregate contents have a significant impact on the moisture and rutting resistance of CIR mixes. Limestone-modified mixes were more resistant to moisture damage. However, steel slag-modified mixes showed better performance against rutting distress.