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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This study identifies and describes current practice and available methods for evaluating the influence of local ground conditions on earthquake design ground motions on a site-specific basis. Information includes criteria used to determine when a site-specific analysis is needed, how to develop input parameters required for a site-response analysis, the nature of the site-response analysis performed (equivalent-linear, total stress nonlinear, effective-stress nonlinear), the process of model setup, and how uncertainties are dealt with in the analysis process. Information was gathered by a literature review and a survey of state departments of transportation and selected academics.
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Recent Roadway Geometric Design Research for Improved Safety and Operations
Author: Brewer, Marcus A | Size: 3.14 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 90 | ISBN: 9780309223591
Use of the design-build project delivery method by state agencies for transportation projects is increasing each year. This study reviews how states use geotechnical information in solicitation documents and contracts for design-build highway projects. The report examines current practices regarding the allocation of geotechnical risk and the level of geotechnical information provided with bid documents, the scope of geotechnical information required after contract award, geotechnical-related performance testing during construction, and contract provisions related to geotechnical design and construction. Information used in this study was gathered through a literature review, a survey of state departments of transportation (DOTs), analysis of design-build policy guidelines and solicitation documents from state DOTs, and interviews with design-build contractors. The report also provides case studies on legal and engineering geotechnical issues.
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Autodesk Autocad Utility Design Version 2013 (WIN32)
Size: 1.77 GB
AutoCAD Utility Design software is a model-based design solution for electrical distribution networks that combines design and documentation with standards-driven workflows and analysis. Utility designers and engineers can improve productivity, analyze and optimize network designs for performance and reliability, and deliver more consistent and coordinated construction documentationall in a familiar AutoCAD software environment.
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IMPORTANT NOTICE: You may use this software for evaluation purposes only.
If you like it, it is strongly suggested you buy it to support the developers.
By any means you may not use this software to make money or use it for commercial purpose.
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