详情

Project 1b: Spalling Solution of Precast - Prestressed Bridge Deck Panels

项目名称：	Project 1b: Spalling Solution of Precast - Prestressed Bridge Deck Panels
摘要：	Precast-prestressed concrete panels are commonly used in the construction of concrete bridge decks. Almost all prefabricated bridge decks in Missouri Department of Transportation's (MoDOT's) inventory consist of precast-prestressed 3" thick deck panels and cast-in-place 5.5" thick slabs on top of the panels. The precast-prestressed concrete panels serve as formwork for the cast-in-place concrete slabs and accelerate the construction of bridge decks in a cost-effective way. Traditionally these panels are reinforced with mild steel temperature reinforcement in the traffic direction along with low-relaxation seven wire steel prestressing strands perpendicular to the traffic direction (along the length of the panel). It was recently observed that some bridges in MoDOT inventory have experienced rusting of embedded steel reinforcement and concrete spalling issues in deck panels. The plausible reasons for spalling observed in many bridges currently in service likely include corrosion of the steel in the panels due to use of deicing salts, permeability/cracking in the panels, and inadequate concrete cover. Corrosion of steel reinforcement can be detrimental as it can result in shorter life spans for the deck panels. Since the use of stay-in-place deck panels has proven to be a very cost-effective practice for concrete bridge deck constructions in Missouri, it is of interest to examine ways to mitigate spalling and the resulting service-life reduction associated with corrosion of embedded reinforcement in these panels. Hence an investigation of the causes and development of solutions including alternate design options for these panels will have a significant economic impact on MoDOT bridge construction practices. Further, as steel reinforcing bar prices continue climbing and more rusting/spalling issues appear, eliminating the steel in these panels could become cost effective. The idea proposed in this project is to replace the steel reinforcement, both prestressed and nonprestressed, by fiber reinforced polymer (FRP) bars and perform experimental testing of these panels to evaluate their long-term structural performance.
状态：	Completed
资金：	349010.00
资助组织：	Center for Infrastructure Engineering Studies<==>Missouri Department of Transportation
开始时间：	20080901
实际结束时间：	20100831
主题领域：	Bridges and other structures；Highways；Maintenance and Preservation；I30: Materials