详情

Remote Detection and Characterization of Field Aging of Asphalt Pavement

项目名称：	Remote Detection and Characterization of Field Aging of Asphalt Pavement
摘要：	The oxidation of binders in asphalt pavements has been a subject of interest for a significant number of years given that oxidative aging constitutes a primary cause of binder hardening in pavements, thus contributing to various forms of pavement failures. The action of oxygen is one of the principal factors responsible for the occurrence of aging phenomena. When asphalt is exposed to atmospheric oxygen, a slow autoxidation occurs, the chemical nature of which depends to a very large extent upon the temperature. As binders oxidize, carbonyl groups are formed increasing the polarity of their host compounds and making them much more likely to associate with other polar compounds. As they form these associations, they create less soluble asphaltenes materials, which behave like solid particles. This composition change results in orders-of-magnitude increases in both the asphalt�s viscous and elastic properties. The end result is a material that increases its stress greatly with deformation and simultaneously cannot relieve the stress by flow, leading to a pavement that is very brittle and susceptible to fatigue and thermal cracking. Current techniques do not allow for the detection of asphalt aging levels in the field. Most of the experimental techniques are limited to laboratory settings, thus leading to erroneous simulation predictions compared to actual observed degradation levels in the field. The objective of this project is to design and implement a low cost, easy to install, and implementable in the field, sensing system. The process is based on the inclusion of the material of chemical compounds that exhibit similar oxidation kinetics properties as to the used asphalt binder. These engineered compounds will also contain fluorescent elements which exhibit a varying fluorescence emission spectrum depending on levels of concentration of surrounding reactants (such as oxygen). The system will characterize the levels of oxidation in a particular location where the engineered compounds have been added and will be interrogated using remote imaging analysis (detection of emission spectrum). Successful development of this technique would allow for: (1) field sensing and evaluation of levels of oxidative aging of asphalt; (2) improve prediction models and correct for discrepancies between laboratory and field observations, thus improving planning in the context of pavement network preservation.
状态：	Active
资金：	74448
资助组织：	Office of the Assistant Secretary for Research and Technology
管理组织：	Michigan State University - Center for Pavement Preservation
执行机构：	Michigan State University, East Lansing
主要研究人员：	Chatti, Karim
开始时间：	20170131
预计完成日期：	20180731
实际结束时间：	0