Performance evolution of Hot-Mix and Warm-Mix asphalt with field and laboratory aging
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abstract
Economic, environmental, and engineering benefits promoted the rapid implementation of Warm-Mix Asphalt (WMA) across the world during the past decade. While WMA technologies have been successfully used as a paving material, concerns remain about the difference in performance between WMA and Hot-Mix Asphalt (HMA) due to changes in the mixture production process. Previous laboratory testing results indicate that WMA is oftentimes more susceptible to rutting and moisture damage as compared to HMA, and that this difference in performance is minimized with mixture aging. However, the prevalent concern of increased moisture susceptibility of WMA has not been observed in the field. The objectives of this study are to evaluate the differences in stiffness and moisture susceptibility between WMA and HMA with time (i.e., field and laboratory aging). Stiffness was measured with the Resilient Modulus (MR) test, while the Indirect Tensile (IDT) strength test and Hamburg Wheel Tracking Test (HWTT) were used to quantify moisture susceptibility. Test results show that field and laboratory aging significantly increase the stiffness and improve the moisture resistance of the mixtures, and equivalent or better performance can be achieved by WMA versus HMA after a summer of field aging or significant laboratory Long-Term Oven Aging (LTOA). The correlation between field aging and laboratory LTOA in terms of mixture performance was also determined as part of this study.
