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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This study has looked at how U.S. transportation agencies have applied engineering economics (benefit–cost analyses and similar procedures) to decisions on highway investments. State departments of transportation (DOTs) are most likely to use economic methods when considering investments in pavement and bridge preservation, safety improvements, and major projects on trunk lines and in urban areas. This study, however, has found agencies that use economic information across their key business and decision processes. Information was gathered through literature review, presentations at conference committee meetings, a screening survey of state DOTs, and interviews leading to case studies.
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Author: Russell, Henry G Henry G. Russell, Incorporated | Size: 2.04 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 67 | ISBN: 9780309223461
The objective of this synthesis study was to update NCHRP Synthesis of Highway Practice 220, "Waterproofing Membranes for Concrete Bridge Decks," a report on the same topic published in 1995. This synthesis documents information on materials, specification requirements, design details, application methods, system performance, and costs of waterproofing membranes used on new and existing bridge decks since 1995. The synthesis focuses on North American practices with some information provided about systems used in Europe and Asia. Information used in this study was acquired through a review of the literature and surveys of state departments of transportation and Canadian provincial transportation agencies. For additional details, follow-up interviews were conducted with several agencies.
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This synthesis examines current performance-based management practices that are applied by state departments of transportation (DOTs) in highway maintenance and operations (M&O). Past studies have focused on the elements that make up a performance-based M&O approach, such as condition ratings, levels of service, performance measures, and threshold values. This study focuses on how state DOTs actually use performance-based measures to manage their highway programs. Information used in this study was acquired through a review of the literature, a survey of state DOTs, and follow-up interviews with four state DOTs to develop case examples of highway M&O performance management.
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Author: Dowling, Richard G Elias, Aaron | Size: 1.40 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 61 | ISBN: 9780309223546
The Highway Capacity Manual (HCM), a publication of the Transportation Research Board, is used for a variety of transportation facility and traffic engineering applications. This study reports on the current use of the HCM in transportation planning by federal, state, regional, and local agencies. The scope includes performance monitoring, problem identification, project prioritization, programming, and decision-making processes. Information was gathered through a literature review, a survey of selected agencies, and in-depth interviews.
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