Investigation the effect of different types of mineral fillers on mechanical properties of Hot Mix Asphalt

Abstract

Abstract The use of waste materials in the construction process has become more popular during the last decades since that it reduces the initial cost and reduces the cost of solid waste disposal. Rice Husk Ash (RHA) is a waste material available in a huge quantity of Iraq and used as mineral filler in this study. The current research focuses on the investigation of the effect of three types of mineral filler on mechanical properties of Hot Mix Asphalt (HMA). In addition to RHA, the limestone and Ordinary Portland Cement (OPC) were used as mineral fillers (MF). The RHA was prepared by burning it in two stages, the first stage involves burning the RHA in a closed space and the second stage involves burning the RHA in an oven at 800 °C for two hours. Different percentages of these mineral fillers as (25%, 50%, 75% and 100%) RHA and OPC replacement with conventional mineral filler were used in produced HMA. The obtained mixes were tested to determine Marshall Stability, Marshall Flow, indirect tensile strength and tensile strength ratio. The results showed that the RHA can be used as mineral filler in HMA; however, the optimum ratio of mineral filler was 25 % RHA and 75 % limestone.