Improved Resistance of Long-Term Aged Warm-Mix Asphalt to Moisture Damage Containing Moist Aggregates

Effect of SBS Polymer and Anti-stripping Agents on the Moisture Susceptibility of Hot and Warm Mix Asphalt Mixtures

“…Based on previous researches, modification of bitumen with 5% SBS (by weight percent of bitumen) showed satisfactory results regarding performance of asphalt mixtures [31,32]. Therefore, this SBS percentage (5%) was added to bitumen using a high shear mixer at speed of 3500 rotation per minute for about 15 minutes.…”

“…They indicated that the resistance of WMA mixtures against moisture damage was improved with long-term aging. The aggregate type had a key role in controlling ITS values [31].…”

A Review of Warm Mix Asphalt Technology: Technical, Eco-nomical and Enviromental Aspects

“…An updated state of knowledge on the subject can be found in Mehrara and Khodaii (2013). The lower manufacturing temperatures can make the drying of the stone aggregate in asphalt plants insufficient, producing the loss of adhesion between the stone aggregate and the asphalt binder in the mixture (Vaitkus et al 2009;Xiao et al 2010;Mallick et al 2011;Mogawer et al 2011a;Kanitpong et al 2012;Ali et al 2014;Sengöz et al 2013;Xiao et al 2011Xiao et al , 2013Xiao et al , 2013a and generating mixtures that are susceptible to moisture damage. In the laboratory design of mixtures, this phenomenon is not apparent because, in general, the stone aggregate is dried in ovens before being mixed with the binder.…”

“…In the laboratory design of mixtures, this phenomenon is not apparent because, in general, the stone aggregate is dried in ovens before being mixed with the binder. To increase the resistance to moisture damage, some researchers have opted to add hydrated lime (conventional and in nanoparticles) to the stone aggregate or anti-stripping additives, such as amines, diamines, liquid polymers, Portland cement, fly ash, and combustion powder (e.g., Buddhala et al 2011;Hashemian 2011, 2012;Cheng et al 2011;Arabani et al 2012;Hossain et al 2012;Shivaprasad et al 2011aShivaprasad et al , 2012Xiao et al 2010Xiao et al , 2012Diab et al 2013;Xiao et al 2013;Kavussi et al 2014). Certain researchers, such as Kanitpong et al (2012) and Sangsefidi et al (2014), report that the deficiencies found in WMA can be addressed by the use of good stone aggregates and an optimum grading curve, which generates high adhesion properties with the asphalt and cohesion.…”

Rheology evaluations of WMA binders using ultraviolet and PAV aging procedures

“…Research articles on WMA technologies indicate that reducing the aging temperature reduces the aging index and increases the m-values, but has no significant effects on G ⁄ /sin d, G ⁄ sin d and stiffness of the binders [23][24]. Also, the addition of warm asphalt additives significantly increases the G ⁄ /sin d values and lowers the m-values of the binders [23].…”