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Publication Number: FHWA-SA-97-027
Date: September 1997
The Superpave system isn't just for State highway agencies. Local governments across the country are also beginning to see the advantages of switching to the Superpave system. One of the first was Albuquerque, New Mexico, where the Public Works Department and local industry are using the Superpave aggregate gradations and the Superpave binder specification to improve the performance of their asphalt pavements.
Now that the long-term pavement performance (LTPP) program is at its midpoint, the 20-year study is beginning to yield new information on asphalt and portland cement concrete pavements, as well as new products for use in pavement design, maintenance, and research. To help engineers, researchers, and others stay abreast of the new information and products, the Federal Highway Administration (FHWA) is rolling out a series of summaries of recent LTPP reports. The summaries, known as Tech Briefs, concisely report the objectives and key findings of the research and relate how these findings will affect current practice. They include descriptions of new test methods, design guidelines, or other products that have resulted from the research project.
There's good news for portland cement concrete bridges that are deteriorating as a result of corrosion caused by deicing salt or seawater. In the past decade, the cost of rehabilitating and protecting these bridges using cathodic protection systems has fallen by as much as one-half, making an already cost-effective technology even more affordable.
As the Superpave mix design system takes hold across the country, highway agencies, contractors, and others are asking questions about the system. Here are answers to some of the most frequently asked questions.
A new series of training workshops in pavement preventive maintenance is being developed by the Federal Highway Administration (FHWA) with financial support from industry.
Maintenance engineers have been making the case for preventive maintenance for years-but their message has often gone unheeded. Now, a study from the Michigan Department of Transportation (DOT) provides hard evidence that preventive maintenance is a wise investment. According to the study, the DOT's preventive maintenance strategy is more than six times as cost-effective as rehabilitation and reconstruction projects.
Finding an industry partner to construct and operate Minnesota's road weather information system (RWIS) has proven more difficult than expected, but the Minnesota Department of Transportation (DOT) hasn't given up on the idea of privatizing its RWIS network.
In late June, 10 new sections of pavement were placed at WesTrack, FHWA's hot-mix asphalt test track in Nevada. The new sections did not last long: within days of being put in service, several of the new sections began exhibiting permanent deformation.
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