Comparing the properties of HMA with warm asphalt mixes by varying temperatures using sasobit and stearic acid as additives

Abstract

A recent technology used to minimize mixing and compaction temperatures without affecting pavement consistency is Warm Mix Asphalt (WMA). The Warm Mix Asphalt (WMA) is modified to produce, lay and compact Hot Mix Asphalt (HMA) at temperatures that are lower than conventional HMA. The WMA is developed to enhance the efficiency of the pavement by mixing chemical additives into the traditional mix. In this study an attempt is made to compare the Marshall properties of WMA produced with the inorganic additive: “SASOBIT” and chemical additive “STEARIC ACID” with HMA for Dense Grade Bituminous Macadam (DBM). The adopted mixing temperature for HMA was 160°C and the mixing temperatures for WMA was 110°C - 140°C, with an additive dosage rate of 3% by weight of the binder respectively.The optimum binder content was to be found out individually for the mixture for different mixing temperatures and additive dosage rate. The Laboratory Study Concludes that volumetric properties (VA, VMA and VFB), stability, flow value was improved for WMA mix by the addition of the additive.