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Concrete Pavement Technology Update
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In This Update:
Quest for Long-Life Concrete Pavements
U.S. Experts Learn Canadian and European Approaches
In May 2006, a team of 13 concrete pavement and concrete materials specialists from the United States visited Canada, Germany, Austria, Belgium, The Netherlands, and the United Kingdom to identify successful design approaches, material requirements, construction practices, and maintenance strategies for long-life concrete pavements. The scan tour was sponsored by the American Association of State Highway and Transportation Officials, Federal Highway Administration (FHWA), and National Cooperative Highway Research Program. The team included experts and leaders from FHWA, State departments of transportation, academia, and industry. The following activities were conducted:
Typical "super-single" tridem axles in use in European countries visited.
The scan tour confirmed that well-designed and well-constructed concrete pavements (both CRCP and JPCP) continue to be important pavement types in the countries visited. Concrete pavements in the European countries visited are designated as long-life and are designed for 30 or more years of low-maintenance service life. The European countries visited are responding aggressively to pavement-tire noise issues in urban areas, and the exposed aggregate surface is the texture of choice in Germany, Austria, Belgium, and The Netherlands. A two-lift concrete placement is used to obtain the exposed aggregate surface. In the UK, the use of an asphalt-based wearing surface is mandated for highway concrete pavements. Also, Germany and Austria have successfully implemented the use of catalog designs for their jointed plain concrete pavements. Germany requires use of a geo-fabric as a separator layer between cement-treated base and the concrete pavement, while the use of an asphalt concrete interlayer is required in Austria. Belgium primarily uses continuously reinforced pavements.
Exposed aggregate surface on an Austrian motorway pavement.
The long-life concrete pavement scan team tentatively identified the following items as having the greatest impact for improving pavement design and construction practices in the United States:
The final report on the scan trip findings is expected to be available during early 2007. The highlights and findings of the scan trip were discussed at the International Conference on Long-Life Concrete Pavements, held in Chicago, Illinois, October 25 to 27, 2006.
Scan team touring at the accelerated load testing facility at the Transport Research Laboratory (TRL).
Article prepared by Shiraz Tayabji, email@example.com
For more information on the Scan, contact:
Update on CPTP Project Reports
The Concrete Pavement Technology Program continues to produce various reports under each of its six focus areas (design, materials, construction, repair and rehabilitation, user satisfaction, and technology transfer). Recent additions to the CPTP library, listed below, may be accessed at the FHWA Concrete Pavements page. A complete project listing of CPTP reports and products is also available at the Web site.
Tests or Standards to Identify Compatible Combinations of Individually Acceptable Concrete Materials
Computer-Based Guidelines for Concrete Pavements
Guide for Curing of Portland Cement Concrete Pavements
Achieving a High Level of Smoothness in Concrete Pavements Without Sacrificing Long-Term Performance
Long-Term Plan for Concrete Pavement Research and Technology―The Concrete Pavement Road Map
High Performance Concrete Pavements
TechBrief: Use of Magnetic Tomography Technology to Evaluate Dowel Bar Placement (FHWA-IF-06-002)
TechBrief: Maturity Testing for Concrete Pavement Applications (FHWA-IF-06-004)
TechBrief: Concrete Pavement Rehabilitation and Preservation Treatments (FHWA-IF-06-005)
In addition, several publications and documents will be completed within the coming months and should be available from FHWA shortly thereafter. These reports, which are all based on CPTP projects or CPTP-related disciplines, include the following:
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