This paper examines some of the research innovations in the 20th century that led to advancements in concrete. The paper also explores what the future may hold as a result of the continuing advancements in high-performance durable concrete. The paper is organized under the following subheadings: significant areas of development; rehabilitation of deteriorating and damaged infrastructure components; design and rehabilitation; recent developments (creep and shrinkage control models, geopolymer concrete, flexible engineered cementitious concrete, hybrid GFRP-reinforcement for bridges and other structural systems, and self-consolidating concrete); constructability considerations; long-term durability; education and training; monitoring and cost evaluation; and expectations and conclusions.
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An all-day workshop at the 84th Annual Meeting of the Transportation Research Board (TRB) addressed asphalt practitioners' concerns related to specifying and achieving density during hot-mix asphalt (HMA) pavement construction. The workshop was divided into four mini-sessions with the following themes: Optimizing HMA Construction Temperatures; Recent Advances in Compaction Equipment, Including "Intelligent Compaction"; Longitudinal Joint Density; and Incentives-Disincentives for Construction Quality. The papers in this document are invited papers for this workshop.
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This circular summarizes a peer exchange that took place in Washington, D.C., on May 3-4, 2006. The peer exchange highlighted several examples of successful collaboration, data sharing, and the effective use of environmental geospatial information systems data in transportation planning. The report focuses on environmental stewardship, streamlining, and sustainable growth; the importance of effective collaboration; and building capacity for data management and sharing. Appendices to the report include the final meeting agenda, biographies of presenters and panelists, contact information for all participants, responses of Mid-Atlantic states to a preconference questionnaire, and references for related initiatives and resources.
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Transportation asset management is a data-intensive process and data integration is a fundamental component to improve integrated decision making. The evolution of geographic information systems and spatial technologies is providing powerful mechanisms for developing asset management decision-making products. However, many agencies are struggling with the development of these spatial products on an enterprise basis. The Transportation Research Board (TRB) Transportation Asset Management Committee (ABC40) and Spatial Data and Information Science Committee (ABJ60) hosted a peer exchange to investigate state and local agency applications of spatial technologies for asset management activities and to identify ongoing issues and research directions. Six state and local transportation agencies were selected based on their leadership and progress in the application of spatial technologies towards asset management. These six agencies were the Alaska Department of Transportation and Public Facilities; the City of Edmonton, Alberta, Canada; the Kansas Department of Transportation; the New York State Department of Transportation; the New York State Thruway Authority; and the North Carolina Department of Transportation. Prior to the peer exchange, agency participants completed an extensive questionnaire on their uses of spatial technologies, their history of implementation, and perceived benefits and issues. The peer exchange participants focused on three major issue areas in moving spatial technology applications to the next level: managing change, data integration, and communication. Upon a thorough discussion of these issues, the peer participants identified research to address three areas of interest: temporal issues, symbology, and data and visualization models. The roles of national organizations in sharing best practices and in promoting standards and open data architectures were also discussed. This circular contains the presentations of the perspectives of the six agencies, a summary of agency responses to the questionnaire, and a summary of the major issues and research directions for the future.
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This circular contains the proceedings of the Joint International Light Rail Conference that was held in St. Louis, Missouri, on April 9-11, 2006. The conference focused on planning and urban integration; vehicle design and innovation; infrastructure use; security and fare enforcement; new infrastructure design; the case for contracting; light rail transit and bus rapid transit; regulations and standards; accessibility; streetcars; financing and controlling capital costs; and operations, supervision, and service quality. The circular includes 26 papers presented at the conference.
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This circular includes six articles that explore five general artificial intelligence (AI) areas including knowledge-based systems, neural networks, fuzzy sets, genetic algorithms, and agent-based models. The circular is designed to serve as an informational resource for transportation practitioners and managers with respect to AI tools within these general areas. Each article details the types of problems to which the paradigm is best suited, its strengths and weaknesses, example applications, and guidelines for its application.
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This circular explores what geotechnical engineers have learned since the construction of the Interstate Highway System and what they see as future challenges for the discipline. The circular is based on presentations made during a session at the 2006 Transportation Research Board 85th Annual Meeting.
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The design and construction of the Interstate Highway System (IHS) is one of the most significant and costly public works projects in the history of the United States. Given that the 50th anniversary of the enabling legislation for the IHS occurred during 2006, it is appropriate to reflect on the performance of the system, specifically its pavements. The American Association of State Highway Officials (AASHO) Road Test was authorized by the IHS legislation and occurred about 5 years after the legislation was enabled. It is also assessed in light of what we know today. Reflections on the performance of IHS pavements and lessons learned from the AASHO Road Test were presented in two sessions organized by the Transportation Research Board (TRB) Pavement Management section (AFD00) for the 2006 TRB Annual Meeting. The two sessions were Session 353: Pavement Lessons from the 50-Year-Old Interstate System and Session 470: Views on AASHO Road Test after 50 Years. Each of the presenters was requested to prepare a manuscript for inclusion in this circular. They are included as six papers, not necessarily in the order they were presented in the sessions.
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This circular reviews methods used to recover residue of bituminous emulsions. It summarizes methods used worldwide and suggests new avenues for research and practice. The papers in the circular are based on presentations made during a session at the 2007 Transportation Research Board 86th Annual Meeting.
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TRB’s Transportation Research Circular E-C128 includes papers that were presented at the 10th International Conference on Bridge and Structure Management held on October 20-22, 2008, in Buffalo, New York. The conference brought together practitioners, administrators, and researchers from around the world to exchange information on the development, implementation, and utilization of effective bridge and structure management practices. Issues addressed by papers presented at the meeting included design and implementation of bridge management systems; application of bridge management in transportation agencies; bridge preservation, maintenance, and deterioration rates; application of prioritization and optimization routines; and more.
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