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

摘要：CMMI-：CMMI-0644047沥青路面易受水损害，这是由于水与沥青-集料粘结剂相互作用造成的。尽管沥青混凝土中的湿致损伤研究已有70多年的历史，但仍有两个非常基本的问题没有得到解答：能否准确预测引起湿致损伤的条件？如何减轻潮湿造成的损害？最大的困难在于，水分与沥青-集料键的相互作用是一种发生在原子或纳米尺度上的现象。这项学院早期职业发展(CALEAR)研究和教育建议提供了一种新的方法，可以在纳米级别上理解和量化水分与沥青-集料结合的相互作用，并在宏观水平上将这些相互作用与水分诱导的破坏联系起来。研究目标是：利用原子力显微镜(AFM)捕捉干湿条件下沥青-集料体系粘结力和粘聚力的微观图像，根据AFM数据确定粘结的微观功；构建数学模型和神经网络，根据粘结的微观功确定粘结损伤指数；进行宏观测试并建立模型，将粘结损伤指数与沥青混凝土的宏观湿致损伤联系起来。这项研究的更广泛的影响是，它可能导致大量节省财政和其他资源，这些资源目前用于抗击因潮湿造成的路面损坏。本文建议的研究活动将通过研究生和本科生的研究参与进行。将设立一个暑期教育活动，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、教育和推广目标取得成功。

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.