详情

Subsurface Imaging of Corrosion in Painted Steel Bridges

项目名称：	Subsurface Imaging of Corrosion in Painted Steel Bridges
摘要：	According to a comprehensive study carried out by CC Technologies in 1998, cost of corrosion to the US economy was 3% of the gross domestic product (GDP) in 1998 amounting to $276 billions (FHWA-RD-01-156). From that amount, $121 billion was spent on corrosion control, from which $107 billion was spent on protective coatings. It was reported that better corrosion protection could save up 40% of that cost. Improved practices were sited as better coating quality control and effective inspection at time of coating application, routine/periodic coating inspection during the service life of the structure, and appropriate repair action when coating degradation, delaminate or substrate corrosion is detected. In 2007, New York University Polytechnic Institute was awarded a grant by the gas industry to evaluate infrared thermography as a method for detection of early onset of corrosion in gas pipelines beneath the protective coating. Results indicated that it is possible to detect corrosion at stages earlier than it is possible to detect with current ultrasonic thickness gauges and it is possible to detect poor quality coating, such as the presence of air blisters, even in the absence of corrosion. Furthermore thermal imaging is a two dimensional technique and lends itself for inspection and documentation of surfaces. A preliminary analysis of the application of infrared thermography as a tool for subsurface condition assessment of painted steel bridges is proposed. The objective is to detect early onset of corrosion and to detect paint delamination, both of which are not possible by visual inspection. Currently, federal guidelines hold the contractor responsible for the coating quality, however there is no practical methodology for evaluating the coating and subsurface condition.
状态：	Completed
资金：	11996.00
资助组织：	University Transportation Research Center
项目负责人：	Eickemeyer, Penny
执行机构：	Polytechnic Institute of NYU
开始时间：	20121001
实际结束时间：	20131130
主题领域：	Bridges and other structures；Highways；Maintenance and Preservation