Recycling of Reclaimed Asphalt Pavement (RAP) with Rice Husk Ash (RHA)/Ordinary Portland Cement (OPC) Blend As Filler

Large quantities of agricultural waste are generated daily, and their safe disposal raised much global concern. The popular trends in the stabilization or modification of construction materials, especially soil, have resulted in innovative techniques of utilizing the solid waste materials. This paper presents an experimental investigation into the use of Rice Husk Ash (RHA) as filler to replace Ordinary Portland Cement (OPC) in Reclaimed Asphalt Pavement (RAP). Results of preliminary tests on RAP showed that its properties for pavement mix design were below the standard specification for road works. For correction, RAP was reconstituted with fresh aggregate. Rice Husk Ash (RHA) was used as partial replacement for Ordinary Portland Cement (OPC). Marshall stability tests were performed on various mixes to investigate the pavement performance indices of the blended materials. The most effective combination of mix constituents that meets all design requirements was 70% RAP, 27% fresh aggregate and 3% mineral filler. An optimum value of 25% RHA filler replacement for OPC was obtained. Indirect tensile strength test results indicated that the use of RHA as filler contributes more to crack resistance of recycled asphalt pavement than OPC filler.