Exploring a premium asphalt patching mixes by using 100% RAP recycler********

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Pavements are constantly deteriorating and require routine maintenance such as crack and pothole repairs. Currently in Canada, there is a large surplus of Recycled Asphalt Pavement (RAP) materials. Using more of this abundant resource in asphalt patching mixtures has many economic and environmental benefits. When creating asphalt mixtures with high RAP content, one must use rejuvenators to restore binder properties, most importantly its flexibility. Infrared heating is a technology which can be used to effectively heat asphalt mixtures with less risk of burning and damaging the materials, a common occurrence when using conventional high intensity gas burners. This project will evaluate the performance of asphalt patching mixtures made with 100% RAP materials and infrared heating technology. Extensive laboratory testing is planned to evaluate multiple asphalt patching mixtures created with different RAP source materials, rejuvenators, and temperature of infrared heating applied to them. The performance of these mixtures will be compared to mixtures created with the same materials, but heated with a conventional high intensity gas burner. Proposed laboratory performance tests to evaluate theses asphalt patching mixtures include: dynamic modulus testing, flexural test (four-point bending beam), indirect tension test, thermal stress restrained specimen test, and the Hamburg wheel tracking test. Results expected from this project include: knowledge of how the properties of different RAP materials are affected by infrared heating versus traditional gas burners, quantification of the effects that different rejuvenators have on RAP materials, and the laboratory performance results of asphalt patching mixtures made with 100% RAP materials. Furthermore, this research is focused on creating opportunity for economical roadway patching operations in locations where virgin asphalt material is difficult to acquire, and verifying the environmental benefits of using more RAP materials in roadway repairs and maintenance. ******