CAREER: Characterization and Modeling of Asphalt Concrete for Moisture-Induced Damage

摘要：CMMI-：CMMI-0644047沥青路面易受水分诱导损坏的影响，这是由水分与沥青-骨料粘结相互作用引起的。尽管人们对沥青混凝土中的水分损伤已经研究了70多年，但两个非常基本的问题仍然没有得到回答：能否准确预测导致水分损伤的条件？如何减轻湿气引起的损坏？最大的困难在于，水分与沥青-集料键的相互作用是发生在原子或纳米尺度上的现象。该学院早期职业发展（CAREER）研究和教育建议提供了一种新的方法来理解和量化水分与纳米级沥青-骨料键的相互作用，并将这些相互作用与宏观级别的水分引起的损害联系起来。研究目的是：利用原子力显微镜（AFM）获取干、湿状态下沥青-集料体系的粘着力和内聚力的微观图像，由AFM数据确定微观粘着功，建立由微观粘着功确定粘结损伤指数的数学模型和神经网络，并利用神经网络计算粘结损伤指数。并进行宏观尺度的测试和开发模型，将粘结损伤指数与沥青混凝土中宏观尺度的水分引起的损伤联系起来。这项研究的更广泛的影响是，它可能会导致显着节省的财政和其他资源，目前用于打击路面病害源于水分引起的损害。本文提出的研究活动将通过研究生和本科生的研究参与进行。将举办一次夏季教育活动，重点是高中生的参与。将成立一个由学术界、工业界、政府机构和研究机构的个人组成的咨询委员会，以确保拟议的研究、教育和外联目标取得成功。

Abstract: CMMI-: CMMI-0644047Asphalt pavements are susceptible to moisture induced-damage, which is caused by moisture interaction with asphalt-aggregate bonds. Although moisture-induced damage in asphalt concrete has been studied for over 70 years, two very fundamental questions remain unanswered: Can the conditions that cause moisture-induced damage be accurately predicted? How can moisture-induced damage be mitigated? The foremost difficulty lies in the fact that the moisture interaction with asphalt-aggregate bonds is a phenomenon that occurs at the atomic or nano-scale level. This Faculty Early Career Development (CAREER) research and education proposal offers a novel approach to understanding and quantifying moisture interactions with asphalt-aggregate bonds at the nano-scale level, and relating these interactions to the moisture-induced damage at the Macro-scale level. The research objectives are to: capture microscopic images of the adhesive and cohesive forces in the asphalt-aggregate system under dry and wet conditions using an atomic force microscope (AFM), determine the microscopic work of adhesion from the AFM data; construct mathematical models and neural networks to determine the bond damage index from the microscopic work of adhesion; and conduct macro-scale testing and develop models to relate the bond damage index to the macro-scale moisture-induced damage in asphalt concrete. The broader impact of this study is that it may result in significant saving of financial and other resources that are currently used to combat pavement distresses originating from moisture-induced damages. The research activities proposed herein will be conducted through the research participation of graduate and undergraduate students. A summer educational event will be established that will focus on the participation of high school students. An advisory board consisting of individuals from academia, industries, government agencies and research institutions will be formed to ensure success of the proposed research, educational and outreach objectives.