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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In-place recycling and reclamation of asphalt pavements provides agencies with the ability to optimize the value of in-place materials, minimize construction time and traffic flow disruptions, and reduce the number of construction vehicles moving in and out of the construction area. This report discusses the use of hot in-place recycling, cold in-place recycling, and full-depth reclamation. Information for this report was gathered by literature review, a survey of state departments of transportation and contractors, and selected interviews.
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Trade-Off Considerations in Highway Geometric Design
Author: Dorothy, Paul W Thieken, Stephen L | Size: 8.49 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 171 | ISBN: 9780309143455
This synthesis describes the processes that transportation agencies currently use to evaluate geometric design trade-offs between competing interests. It also highlights existing key publications on conventional approaches, context-sensitive solutions/context-sensitive design, and performance-based approaches, as well as gaps in information or analysis processes available to support design decisions. The audience for this report includes practitioners in transportation project development and delivery. Information used in this study was acquired through a review of the literature and surveys.
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Long-Term Performance of Polymer Concrete for Bridge Decks
Author: Fowler, David W University of Texas, Austin Whitney, David W | Size: 5.02 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 71 | ISBN: 9780309143547
Thin polymer overlays (TPOs) consist of a polymer binder and aggregates with a thickness not exceeding 25 mm (1 in.). They have provided long-lasting wearing surfaces for bridge decks with many advantages, including adding very little dead load; very fast cure times; shallow depths that eliminate the need for raising approach slabs; ability to transition from overlaid lane to non-overlaid lane during construction; low permeability; and good frictional resistance. This study found that TPOs have become an accepted construction method for deck preservation, restoring surface friction and extending the lives of decks. When constructed properly on sound decks, TPOs should provide a service life of 20 or 25 years. Information was gathered through literature review, a survey of all state transportation agencies, and selected interviews.
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