A review of the use of recycled concrete aggregate (RCA) in new construction has been issued by the Minnesota Department of Transportation. The report evaluates the current state of practice across the U.S. and historical performance data to understand differences between RCA pavements and non-RCA pavements. It includes an economic analysis and provides guidelines from the American Concrete Institute, Federal Highway Administration and AASHTO for suggested uses and quality types of concrete. The report recommends that the use of recycled fines not be permitted during construction and that mitigation techniques should be used to prevent alkali-aggregate related distress. For more information, link to the report. (3-4-17).
The Transportation Research Board has issued a report under the National Cooperative Highway Research Program (NCHRP) concerning the management of aging bridges. The report addresses the reuse of bridge foundations to reduce costs and traffic impacts, and to provide environmental benefits. The report provides a review of the national bridge system that highlights reasons at the state level for reusing foundations. The report discusses methods for investigating reuse, design of reused foundations, and construction techniques and performance monitoring. The report also focuses on case studies from Colorado, Illinois, Maine and Ontario. For more information, link to the report. (2-27-17)
The Transportation Research Board’s National Cooperative Highway Research Program has released a report concerning the use of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in asphalt mixtures. The report summarizes current practices for the use of RAP and RAS in the design, production and construction of asphalt mixtures. The report also focuses on collecting information about the use of high percentage RAP, RAS and/or a combination of RAP and RAS. For more information, link to the report. (9-9-16)
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