Moisture Susceptibility of Warm-Mix Asphalt Containing Wax- and Chemical-Based Additives

Abstract

The present study deals with two types of warm-mix asphalt additives [i.e., wax-based and chemical-based warm-mix asphalt (WMA)]. It involves the application of low calcium fly ash (FA) as a replacement for natural stone dust (NSD) in WMA. The FA content varied from 2% to 8% by the weight of the mix and was subjected to moisture susceptibility tests. The Marshall properties and indirect tensile strength (ITS) tests were conducted for strength evaluation, and the tensile strength ratio was evaluated per AASTHO T283. Also, cohesion resistance and rutting were evaluated for the mixes. A significant increment in strength and reduction in moisture susceptibility was observed in both methods with FA addition. The Cantabro loss and rut depth with wax-based prepared samples was less compared to chemical-based samples. The statistical analysis reported that there was a significant difference between the two techniques.