Recommendations

Although the improved performance of the US-56 mixture after the addition of ARA could have been the result of higher binder content and softer original binder (Table 1), thereby allowing easier diffusion of ARA, the declined or unimproved performances of US-59 and K-14 mixtures demonstrate the need for modifications in ARA application rate and time/temperature of mixing. While it is known that the content of asphalt binder and its microstructure affect the mechanical properties of asphalt binder, and consequently asphalt mixture, more research is needed to connect microstructural properties of asphalt binder with performance characteristics of asphalt mixture. It is recommended that KDOT investigates possible specification changes in order to improve ARA mixing since the results of this study suggest that increased binder consistency leads to improved performance of HIR mixtures.

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