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

摘要/ Abstract摘要：CMMI-: CMMI-0644047沥青路面易发生湿气损伤，这是由湿气与沥青-骨料键的相互作用引起的。尽管沥青混凝土的湿损伤研究已经有70多年了，但仍有两个非常基本的问题没有得到解答：能否准确预测导致湿损伤的条件？如何减轻湿气造成的损害？最大的困难在于水分与沥青-骨料键的相互作用是一种发生在原子或纳米尺度上的现象。这项教师早期职业发展（Career）研究和教育提案提供了一种在纳米尺度上理解和量化沥青-骨料键与水分相互作用的新方法，并将这些相互作用与宏观尺度上的水分诱导损伤联系起来。研究目标是：利用原子力显微镜（AFM）捕捉干燥和潮湿条件下沥青-骨料体系的黏附力和黏附力的微观图像，根据AFM数据确定黏附的微观功；建立数学模型和神经网络，从粘接微观功出发确定粘接损伤指标；并进行宏观尺度试验，建立模型，将沥青混凝土粘结损伤指标与宏观尺度水致损伤联系起来。这项研究的更广泛的影响是，它可能会导致大量的财政和其他资源的节省，这些资源目前用于对抗由潮湿引起的损坏引起的路面损害。本文提出的研究活动将通过研究生和本科生的研究参与来进行。将设立以高中生参与为中心的夏季教育活动。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、教育和推广目标的成功。

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.