EFFECT OF USE OF RECYCLED MATERIALS ON INDIRECT TENSILE STRENGTH OF ASPHALT CONCRETE MIXES

Abstract

Depletion of natural resources and aggregate quarries for the road construction is a serious problem to procure materials. Hence recycling or reuse of material is beneficial. On emphasizing development in sustainable construction in the present era, recycling of asphalt pavements is one of the effective and proven rehabilitation processes. For the laboratory investigations reclaimed asphalt pavement (RAP) from NH-4 and crumb rubber modified binder (CRMB-55) was used. Foundry waste was used as a replacement to conventional filler. Laboratory tests were conducted on asphalt concrete mixes with 30, 40, 50, and 60 percent replacement with RAP. These test results were compared with conventional mixes and asphalt concrete mixes with complete binder extracted RAP aggregates. Mix design was carried out by Marshall Method. The Marshall Tests indicated highest stability values for asphalt concrete (AC) mixes with 60% RAP. The optimum binder content (OBC) decreased with increased in RAP in AC mixes. The Indirect Tensile Strength (ITS) for AC mixes with RAP also was found to be higher when compared to conventional AC mixes at 30 0 C.