A Study on Engineering Properties of Carbide Lime Modified Asphalt Concrete Mixes

抄録

This study investigated the properties of asphalt concrete mixes prepared with waste carbide lime (CL) in place of conventional stone dust (SD) as filler. Firstly, various characterization properties of CL and SD were determined. Subsequently, optimum asphalt content (OAC) of asphalt concrete mixes having both fillers were determined and their mechanical, volumetric properties as well as performance against rutting, cracking and moisture sensitivity was assessed. CL modified mixes had relatively higher OAC than conventional mixes due to the higher porosity of CL, they also had marginally higher Marshall stability, rutting resistance, and cracking resistance. This was primarily attributed to higher fineness of CL which cause its uniform distribution in asphalt mixes. CL modified mixes also displayed superior moisture resistance and active-passive adhesions. This might be attributed to the presence of high amount of asphalt aggregate adhesion promoters like Portlandite and calcite in the composition of CL.