Effect of type and percentage of unconventional mineral fillers on the performance of hot mixed asphalt

Abstract

There were several studies, analysis and research projects concerning the performance, practicability and environmental suitableness of using recycled products in highway construction. There are plenty of local waste materials that might be utilized effectively as mineral filler in hot mix asphalt concrete (HMA) rather than traditional limestone dust. The main objective of this study is to explore through an experiment the effect of amount and quality of appending three different unconventional types of mineral filler include waste glass beads (WGB), local loam redbrick dust (LRD) and coal fly ash (CFA) as proposed alternative materials instead of the traditional limestone powder (LSP). for this purpose, a comprehensive laboratory-testing program was performed to determine the effect of different sorts and amounts of those fillers on the engineering and mechanical properties of HMA, and then verify the consequents on design properties and performance of the surface layer of flexible pavement. Based on this investigational program, it is verified that fillers comprise important influence on the properties of HMA mixtures. In addition, inclusion of theses non-conventional fillers could be utilized efficiently in asphalt-concrete mixture as a replacement in terms of stability, deformation and voids characteristics.