Author: Russell, Henry G | Size: 15.77 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2009 | pages: 83 | ISBN: 9780309098304
Bridges built with adjacent precast, prestressed concrete box beams are a popular and economical solution in many states because they can be constructed rapidly and most deck forming is eliminated. Bridges constructed with box beams have been in service for many years and have generally performed well. A recurring problem, however, is cracking in the longitudinal grouted joints between adjacent beams, resulting in reflective cracks forming in the wearing surface. This in turn may lead to leakage, corrosion, and, in severe cases, complete cracking of joints and loss of load transfer. This study discusses current design and construction practices that are reported to reduce the likelihood of longitudinal cracking in box beam bridges. Information for the study was gathered through a literature review. In addition, state and Canadian provincial transportation agencies were surveyed, and the survey was augmented with selected individual interviews.
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Scour is the primary cause of bridge failure in the United States. There are more than 20,000 highway bridges that are rated "scour critical." Selected bridges have been monitored for more than ten years and valuable field data have been obtained from these bridges. This report presents the current state of practice for fixed scour bridge monitoring. It will be useful for bridge owners, in particular those responsible for bridge maintenance and safety. Information for this report was obtained through literature review, survey of the state transportation agencies, and selected interviews.
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This study gathers information on current practices that senior managers at transportation agencies use to make network-level decisions on resource allocations for their bridge programs. In particular, the study explores how agency bridge management systems are employed in this process. Information was gathered through a review of literature on U.S. and international bridge management, a survey of U.S. and Canadian transportation agencies, and 15 in-depth interviews with state department of transportation executive and bridge managers.
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Cathodic Protection for Life Extension of Existing Reinforced Concrete Bridge Elements
Author: Sohanghpurwala, Ali Akbar | Size: 2.08 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2009 | pages: 56 | ISBN: 9780309098397
Cathodic protection is the only technology that can directly stop corrosion in reinforced concrete structures. This report examines the use of cathodic protection by state transportation agencies for controlling corrosion on existing reinforced concrete bridge elements. There are descriptions of different types of systems and case studies of states using these systems. As well, there is analysis of reasons that public agencies may or may not employ cathodic protection. Information was gathered through a literature review and a survey of U.S. state transportation agencies and Canadian provincial transportation agencies, augmented by selected interviews.
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During all phases of the transportation planning, development, and operations process environmental data are needed to prepare environmental documents, obtain permits, design and construct road improvements, mitigate or avoid impacts, monitor mitigation, and conduct maintenance activities. The objectives of this synthesis were to survey transportation and natural resource professionals familiar with transportation systems to identify ecological survey needs related to transportation activities and to identify technologies, techniques, and innovative methods to fulfill those needs. These technologies, techniques, and methods, collectively called new approaches, include data collection, its analysis and delivery, how it can be used in planning and operations, and cooperative working relations. The audience for this synthesis includes transportation professionals responsible for planning, designing, constructing, operating, and maintaining transportation projects and the road corridor in an environmentally and fiscally responsible manner, as well as professionals in natural resource agencies and other organizations who work with departments of transportation (DOTs) on these issues. The synthesis is based on an electronic survey conducted in early 2008 that was sent to all state DOTs and state fish and wildlife agencies, and concurrent literature and new initiatives searches.
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Transportation agencies are developing procedures and guidelines for managing the quality of pavement data collected to ensure the data meet the needs of the pavement management process. This study reviews the quality management practices being employed by public highway agencies for automated, semi-automated, and manual pavement data collection and delivery. Information was gathered through literature review, surveys of U.S. state and Canadian province public agencies and private contractors, and selected interviews.
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Author: Gransberg, Douglas D | Size: 5.55 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2010 | pages: 123 | ISBN: 9780309143196
This study gathers information on the use of highway microsurfacing treatments by transportation agencies in the United States and Canada. Microsurfacing is a polymer-modified asphalt emulsion cold-mix surface treatment that can remedy a broad range of problems on today's highways. The report identifies and discusses practices reported as effective by transportation agencies in microsurfacing project selection, design, contracting, equipment, construction, and performance measures. Information used in this study was acquired through a review of the literature, a survey distributed to maintenance engineers at all U.S. state departments of transportation (DOTs) and Canadian provincial transportation agencies, evaluation of all 50 state DOT microsurfacing specifications as well as the one used by the U.S. Federal Lands Highway Division, and case studies of six microsurfacing projects from five U.S. states and one Canadian province.
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Author: Maevski, Igor Y | Size: 6.31 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 160 | ISBN: 9780309143301
This synthesis offers information on the state of the practice of design fires in road tunnels, focusing on tunnel fire dynamics and the means of fire management for design guidance. Information is derived from a literature review and a survey of U.S. and international transportation agencies and tunnel owners and reports on their experience with tunnel fire life safety systems such a ventilation and fire protection and detection. Extensive appendices offer more details about tunnel safety projects, fire tests, and national and international standards requirements, as well as past tunnel fire descriptions. Basic information is provided for tunnel operators, first responders, and tunnel agencies to better understand their tunnels and train their personnel. It includes statistical data for fire incidents in road tunnels since 1949 through the last decade, as well as statistical data documents for several tunnel fire safety projects that have been established and accomplished in the United States and Europe. Survey data were also solicited about agencies' experiences regarding problems with systems, gaps in current knowledge, and what improvements agencies would like to see made. Worldwide, a total of 15 agencies reported on their experiences with 319 tunnels yielding a 60% national and 100% international response rate. A majority of the respondents expressed interest in a tunnel fire computer simulator, as only research programs using "Virtual Fires" have been successfully developed and used in Sweden and Austria.
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Each state transportation agency has its own design guidance and standards for nonfreeway resurfacing, restoration, and rehabilitation (3R) projects. These include enhancements to improve highway safety. The purpose of this study was to gather and synthesize current state practices related to 3R projects. Information was acquired through a literature review and a survey of all state transportation agencies. Documents that provide state 3R policies were obtained either from state websites or directly from the states.
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Developing Production Pile Driving Criteria from Test Pile Data
Author: Brown, Dan A Thompson III, W Robert Dan Brown and Associates | Size: 44.79 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 76 | ISBN: 9780309143356
This report provides information on the current practices used by state transportation agencies to develop pile driving criteria, with special attention paid to the use of test pile data in the process. The information collected shows high variability in the level and sophistication of the practices being used. A significant component of the variation in pile driving criteria may be related to the pace of implementation of new approaches for pile testing and differences between agencies in training, experience, and acceptance of new technologies. Information was gathered through a literature review, a survey of all state transportation agencies, and selected interviews.
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