Advancing the characterization of pavement materials to improve the resistance to moisture damage

铺装材料的表征在机械经验设计方法的实施中起着核心作用。表征包括实验室和现场测试套件和基本材料模型，以完全再现材料在各种负载和环境条件下的响应。在沥青和混凝土路面的粘结层和非粘结层中可以观察到水分的影响。本提案的范围仅限于在马尼托巴省和草原地区使用的主要类型的沥青混凝土材料。湿损是加速路面结构退化的主要破坏形式。水分通过扩散降低了某些粘结剂的刚度，并降低了胶泥和骨料颗粒之间的粘结。沥青混凝土在水的作用下损伤机理的识别是一个难点。一种很有前途的方法是确定受水分损害影响的压实混合物的基本材料特性，然后比较水分调节前后的这些特性。该提案确定需要开发一种合理和实用的测试方法，特别是考虑到加拿大交通量和气候的测试方法。这项研究的动机是有机会使用先进的表征方法（动态模量、弹性模量和几种环境调节方法）来提高对水分破坏机制的理解，并分析缓解策略。

Characterization of paving materials has a central role in the implementation of mechanistic-empirical design methods. Characterization encompasses the suite of laboratory and in-situ tests and fundamental material models required to fully reproduce the material response at the various loading and environmental conditions. Moisture effects can be observed in bound and unbound layers of asphalt and concrete pavements. The scope of this proposal is limited to asphalt concrete materials of the predominant types used in Manitoba and the prairie region.Moisture damage is a primary mode of distress which accelerates structural degradation of pavements. Moisture reduces the stiffness of certain binders through diffusion and degrades the bond between the mastic and aggregate particles. The identification of the damage mechanisms of asphalt concrete in the presence of water is difficult. A promising approach is to identify fundamental material properties of the compacted mixtures that are impacted by moisture damage and then compare these properties before and after moisture conditioning.This proposal identifies the need to develop a rational and practical test method, particularly one that takes into account Canadian traffic volumes and climates. The research is motivated by the opportunity to use advanced characterization methods (dynamic modulus, resilient modulus and several environmental conditioning methods) to improve the understanding of moisture damage mechanisms and to analyze mitigation strategies.