Abstract
A relatively recent development in asphalt pavement technology, warm mix asphalt (WMA) offers a number of benefits. Although its most salient advantage is environmental in nature, it shows technical and economic upsides. This paper presents and discusses results for the laboratory evaluation of WMAs, which were compared to traditional hot mix asphalts (HMA). Two types of WMA and two types of HMA of nominal maximum aggregate sizes 10 mm and 19.0 mm were employed. The WMAs were obtained by means of a liquid chemical solution that foamed asphalt binder AC 60-70 (PG 58-22). Aspects studied include moisture susceptibility and strength under monotonic and dynamic loading. Additionally, a battery of tests were performed: Marshall, resilient modulus, permanent deformation and indirect tensile strength. Research leads to the conclusion that the WMA chemical additive decreases mix temperatures by 30° C, which, in turn, translates into better workability and volumetric composition. Furthermore, WMAs display higher levels of resistance to both moisture damage and high service temperatures under monotonic and dynamic loading.
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