Sustainable Road Pavements for Harsh Canadian Climates

在全国范围内，加拿大有超过一百万公里的铺设道路。虽然加拿大拥有丰富的自然美景和地理，但它也有独特而恶劣的气候。由于该国面积很大，各地区的气候各不相同。天气因素（例如，雨、温度、雪）的强度和模式各不相同，对路面的设计、施工、维护和性能具有不同类型的影响。这些因素也有助于发展的各种路面病害，如创建坑洞，车辙和湿滑的路面。这些灾害影响到交通安全、流动性和经济生产力。为了减轻这些影响，公路机构每年花费数亿美元来修理和维护其路面。这项研究计划的目的是解决一些在沥青路面死灰复燃的问题。具体而言，本研究计划包括三个研究部分：1）水分引起的损害的调查和增强的抗水分损害路面的开发：本研究的目的是产生一个全面的了解如何进入路面水诱导剥离沥青从集料在所有子系统的沥青集料混合物，并评估和确定特定于恶劣气候的防潮添加剂2）车辙现象的研究和改进的抗车辙铺路混合物的开发：该研究部分将调查车辙的未知原因，在一个地区，所有的因素，通常是已知的从过去的研究，导致车辙是不存在的或非常小的幅度。将研究常规配合比设计因素、集料的岩相学效应、集料结构设计、胶砂分数和粘合剂的贡献的影响3）用于可持续冰雪控制的自除冰路面的研究和开发：这项研究的目标是设计一种具有可持续防冰添加剂或技术的路面混合物，以减少冬季维护所需的总盐量，而不影响路面的功能和安全要求。这些步骤的结果将用于开发具有增强型防潮添加剂、抗车辙和盐包封聚合物的最佳沥青混合料设计。拟议的研究计划包括基础研究和应用研究。将培训6名学生。在此过程中，该团队将通过了解沥青材料的复杂行为来开发有关这些主题的新知识，并将模拟路面在加拿大恶劣气候下的表现。该计划的预期结果将有助于设计一个长期持久的路面，降低维护成本，更有效地利用公共资金用于基础设施。

Across the country, Canada has more than a million kilometers of paved roads. Although Canada has rich natural beauty and geography, it also has a unique and harsh climate. Since the country is significantly large, the climate varies between regions. Weather factors (e.g., rain, temperature, snow) with their differing magnitudes and patterns each have different types of impacts on the design, construction, maintenance and performance of pavement. These factors also contribute to the development of various pavement distresses, such as the creation of potholes, rutting, and slippery road surfaces. These distresses impact traffic safety, mobility and economic productivity. To mitigate these effects, road agencies spend hundreds of millions of dollars each year for repairing and maintenance of their road pavements. This research program is designed to address some of the resurgent issues in asphalt pavement. Specifically, this research program consists of three research components: 1) Investigation of Moisture Induced Damages and Development of an Enhanced Moisture Damage Resistant Pavement: The goal of this research is to generate a thorough understanding of how ingressed water in pavements induces the stripping of asphalt from aggregate in all subsystems of an asphalt-aggregate mixture, and to evaluate and determine moisture repellent additives specific to harsh climates 2) Investigation of the Rutting Phenomenon and Development of an Improved Rut Resistant Paving Mixtures: This research component will investigate the unknown causes of rutting in a region where all the factors that are generally known from past research to cause rutting are absent or very minimal in magnitude. The effects of conventional mix design factors, the petrographic effects of aggregates, aggregate structural design, mastic fraction and binder's contribution will be studied 3) Investigation and Development of Self-Deicing Pavement for Sustainable Snow and Ice Control: The goal of this research component is to design a pavement mix with a sustainable anti-icing additive or technology that will reduce the total salt required for the winter maintenance, without compromising the pavement's functional and safety requirements. The findings from these steps will be used to develop an optimal asphalt mixture design with enhanced moisture repellent additives, rut resistant and salt encapsulated polymers. The proposed research program includes both fundamental and applied research. A total of six students will be trained. In this process, the team will develop new knowledge on these topics by understanding the complex behaviour of asphaltic materials, and will model how pavement performs under the harsh Canadian climate. The results expected from this program will contribute to the design of a long lasting pavement with lower maintenance costs that more effectively utilizes public money spent on infrastructure.