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

路面不断恶化，需要定期保养，例如修补裂缝和坑洞。目前在加拿大，有大量的再生沥青路面（RAP）材料过剩。在沥青修补料中更多地利用这种丰富的资源具有许多经济和环境效益。在制造高RAP含量的沥青混合料时，必须使用恢复剂来恢复粘合剂的性能，最重要的是它的灵活性。红外线加热是一种技术，可以有效地加热沥青混合物，减少燃烧和损坏材料的风险，这是使用传统高强度燃气燃烧器时常见的情况。本项目将评估100% RAP材料和红外加热技术制成的沥青修补料的性能。计划进行广泛的实验室测试，以评估由不同RAP源材料、再生剂和红外加热温度制成的多种沥青修补料混合物。这些混合物的性能将与用相同材料制成的混合物进行比较，但用传统的高强度气体燃烧器加热。评估这些沥青修补料的实验室性能测试建议包括：动态模量测试、弯曲测试（四点弯曲梁）、间接拉伸测试、热应力约束试件测试和汉堡车轮跟踪测试。该项目的预期结果包括：了解不同RAP材料的性能如何受到红外加热与传统燃气燃烧器的影响，量化不同再生剂对RAP材料的影响，以及100% RAP材料制成的沥青修补混合物的实验室性能结果。此外，本研究的重点是在难以获得原始沥青材料的地区为经济的道路修补作业创造机会，并验证在道路维修和维护中使用更多RAP材料的环境效益。

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.