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原文传递 Continued Evaluation of Pothole Patching Equipment, Materials, and Processes

题名：	Continued Evaluation of Pothole Patching Equipment, Materials, and Processes
作者：	Bennett, D.; Velinsky, S. A.
关键词：	Pothole Patching Equipment##Highway##California Department of Transportation (Caltrans)##Evaluation##Materials analysis##Maintenance crews##Construction##Advanced Highway Maintenance and Construction Technology (AHMCT) Research Center##San Jose maintenance station##
摘要：	California Department of Transportation (Caltrans) maintenance crews repaired approximately 75,000 potholes from 2012-2013. Widely disbursed over 50,000 lane miles of highway, these potholes in most cases rendered conventional lane closures for safe access impractical. Instead, maintenance crews were typically resigned to capitalize on breaks in traffic to rapidly go out and place cold patch asphalt into a pothole and quickly retreat. After the deaths of two Caltrans workers who were patching potholes in 2006-2007, Caltrans tasked the Advanced Highway Maintenance and Construction Technology (AHMCT) Research Center with developing a safe and more efficient means of patching potholes. The implemented solution involved developing and deploying customized, semi-automated pothole patching equipment, which enabled Caltrans workers to patch potholes from inside the vehicle. After an extensive industry search, the Python Manufacturing Incorporated PHP 5000 hot asphalt patching machine was selected because path times averaged less than 30 seconds, which denotes a key prerequisite for conducting moving lane closure operations on mainline highways. The Caltrans District 4 (D4) San Jose maintenance station successfully placed an upgraded Python PHO machine into service patching potholes on mainline highways exclusively in moving closures. The Python PHP machine patching operation consistently applied five tons of hot asphalt patches in a couple of hours, filling potholes across several highways throughout the entire D4 region. Utilizing the Python PHO in mainline patching operations helped Caltrans completely eliminate workers' traffic exposure in highway pothole patching operations. Caltrans D4 personnel therefore fully integrated the Python PHP machine into their work schedule. However, the Python PHP machine was removed from service due to safety and handling concerns expressed by Caltrans Headquarters Maintenance. As a result of the Python PHO's removal from service, the AHMCT Research Center received notification to stop further research on a supplemental task to add urethane spall patching to the Python PHP machine. The Python PHP machine remains functional and located at the University of California, Davis. Meanwhile, Caltrans D4 workers returned to patching potholes manually on foot until improved equipment or other alternatives become available.
总页数：	72
报告类型：	科技报告