Effect of fly ash and styrene butadiene rubber on the properties of hot mix asphalt

Abstract

Asphalt cement is a solid elastic material at low pavement temperatures and fast traffic loading. It like as a liquid viscous material at high pavement temperature or slow traffic loading. This need the improving of the performance of asphalt cement to reduce fatigue cracking at low pavement temperatures and rutting at high pavement temperatures. Addition of Styrene butadiene Rubber (SBR) in asphalt pavement mixtures is one of the solutions to match the required performance standards of the pavements. (SBR) material is an expensive and its application is Unhelpful environmental aspects while fly ash is an inexpensive waste material and its application can reduce environmental pollution. The purpose of the study is to know the effect of changing fly ash ratios, Styrene butadiene Rubber (SBR) and combined (fly ash and SBR) on asphalt cement properties to justify the amount of saving made by replacement of SBR by fly ash. The performance and volumetric properties of through Marshall test method was determined. In this study different contents of fly ash and SBR were used (0%, 1%, 2%, 3%, 4%, and 5%) by weight of asphalt cement. The study conducted that asphalt stiffness increase with increase the content ratio of fly ash from asphalt cement and increase with increase the content ratio of SBR from asphalt cement. All mixtures with combined use of (Fly Ash +SBR) were lower stability than those of control mixture. So, for economic affairs, there is no justifying the proportion of SBR by fly ash.