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原文传递 Best Practices for Construction and Repair of Bridge Approaches and Departures.

题名：	Best Practices for Construction and Repair of Bridge Approaches and Departures.
作者：	Lu, Q.; Li, M.; Gunaratne, M.; Xin, C.; Hoque, M.; Rajalingola, M.
关键词：	Asphalt pavement, Bridge approach, Bridge departure, Rehabilitation criteria, Rehabilitation guidelines, Pavement design
摘要：	Florida Department of Transportation (FDOT) has experienced frequent distresses in bridge approach/departure asphalt pavements in its highway system. Commonly observed distresses include alligator cracking and rutting, which reduce roadway smoothness and safety. To minimize the pavement distress and improve ride quality, there is a need to determine the extent and root causes of the problem and to develop pavement rehabilitation strategies and guidelines. This research serves such purposes by carrying out three research tasks: (1) literature review and extent of the problem; (2) literature review and rehabilitation criteria; and (3) literature review and rehabilitation guidelines. This report summarizes the work and findings under all tasks. From the work under Task 1, it was found that in 2014-2015 on Florida Interstate highways, about 27% of bridges with asphalt pavements on their approaches/departures showed signs of cracking in their approach or departure asphalt pavements, and about 20% of the bridges have noticeable rutting in their approach or departure asphalt pavements. Bridges showing distresses in approach/departure asphalt pavements are mainly on I-75 and I-95. A variety of factors may cause excessive distresses in bridge approach/departure asphalt pavements, among which, inadequate asphalt layer thickness is one potential cause. The common maintenance and rehabilitation (M&R) techniques used by various states for bridge approach/departure asphalt pavements include crack sealing, patching, milling and overlay, and reconstruction. Most states do not have special M&R strategies and guidelines. From the work under Task 2, tentative criteria for rehabilitation of bridge approach/department pavements were recommended. From the work under Task 3, a step-by-step procedure was proposed for identifying and comparing feasible rehabilitation strategies for bridge approach/departure asphalt pavements. The recommended rehabilitation strategy selection procedure includes: (1) pavement condition survey and evaluation; (2) identification of pavement distress causes; (3) selection of rehabilitation techniques; (4) formation of rehabilitation strategies; (5) life-cycle cost analysis; and (6) selection of rehabilitation strategy.
报告类型：	科技报告