Abstract
Warm Mix Asphalt (WMA) technology offers a wide range of potential for use in road construction projects. Although the main advantage of using WMA mixtures is environmental, there are also noteworthy technical and economic benefits. This paper discusses results for the laboratory evaluation of WMA mixtures and their subsequent comparison to traditional hot mix asphalts (HMA). WMA and HMA mixtures of nominal maximum aggregate size of 25 mm were employed in this study. The WMAs were obtained by means of a liquid chemical solution that foams the asphalt binder AC 60-70 (PG 58-22). Aspects studied include strength under monotonic and dynamic loading. Additionally, a battery of tests was performed: Marshall, resilient modulus, permanent deformation and indirect tensile strength. The research herein leads to the conclusion that the WMA chemical additive decreases mix temperatures by 30° C, which, in turn, translates into better mixture workability and volumetric composition. Furthermore, WMAs display higher levels of resistance to high service temperatures under monotonic and dynamic loading.
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