Experimental and Multi-Scale Damage and Healing Characterization of Asphaltic Road Materials: Experimental and Computational Studies

道路交通基础设施对加拿大经济起着直接的支撑作用。不幸的是，加拿大大部分道路基础设施状况的恶化给所有加拿大人造成了沉重的负担，无论是现在还是未来。在过去，道路行业主要依靠基于经验的工程方法来进行道路结构设计和材料选择。由于它们是基于历史的，这些传统的经验道路工程方法是有限的，因为它们不能明确地量化不同交通、创新的道路材料、创新的道路结构设计和替代的道路资产管理政策的道路现场性能。该提案的重点是开发基于机械的道路工程和资产管理系统，以改进加拿大道路的设计和材料规格。本研究建议将多尺度损伤修复力学融入现有的非线性-正交各向异性连续介质道路工程设计和材料设计体系中。在拟议的研究中，利用加拿大光源预测加拿大条件下道路材料的损伤和修复的多尺度道路建模框架将验证所调查的各种加拿大沥青混凝土路面的损伤和修复模型。这项研究将在实验室表征和现场性能测试路段评估的基础上，探索各种沥青路面系统。本研究还将评估与改进全寿命道路性能预测相关的整体经济学，以帮助加拿大在优化资本投资框架中基于生命周期性能预测优化基础设施投资，该框架以科学为基础，而不是依赖传统的资本预算分配方法。这项研究是唯一能够使用加拿大光源来预测和验证加拿大沥青路面内微裂缝和塑性流动的研究，并将为加拿大各种路面和现场状态提供基于科学的路面性能预测。

Road transportation infrastructure plays a direct supportive role to the Canadian economy. Unfortunately, the deteriorated condition state of much of Canada's road infrastructure has created a significant liability for all Canadians, present and future. In the past, the road industry has predominantly relied on empirical based engineering methods for the road structural design and materials selection. Because they are historic based, these traditional empirical road engineering methods are limited because they cannot explicitly quantify road field performance across different traffic, innovative road materials, innovative road structural designs, and alternative road asset management policies. This proposal focuses on the development of mechanistic based road engineering and asset management systems for improved design and materials specifications for Canadian roads. This research proposes to incorporate multi-scale damage-healing mechanics into the existing non-linear-orthotropic continuum road engineering design and materials design systems. In the proposed research, a multi-scale road modeling framework that predicts the damage and healing of road materials in Canadian conditions utilizing the Canadian Light Source will validate damage and healing models of various Canadian asphaltic concrete pavements investigated. This research will explore diverse aspaltic road systems based on laboratory characterization and evaluation of field performance test sections. This research will also evaluate the holistic economics associated with improved whole life road performance prediction to help Canada optimize infrastructure investment based on life cycle performance prediction in optimized capital investment framework that is based on science instead of relying on traditional capital budget allocation approaches. This research is uniquely capable to employ the Canadian Light Source for the prediction and validation of microfracture and plasticity flow within Canadian asphaltic pavements and will provide scientific based pavement performance predictions of diverse Canadian pavements and field state conditions.