The U.S. Department of Transportation has released a report concerning Caltrans’ evaluation of the second Strategic Highway Research Program (SHRP 2) Pavement Renewal Solutions rePave tool. The web-based software tool is to help pavement designers and project engineers select pavement rehabilitation strategies and examine projects with service lives of 30-50 years. Caltrans concluded that the rePave tool is user-friendly and efficient, requiring a minimal amount of data. The report highlights the existing tools that Caltrans uses to evaluate rehabilitation for asphalt-surfaced pavements, concrete surfaced pavements and composite pavements, noting the limitations of existing tools such as overestimation or underestimation of rehabilitation needs and the need for a greater amount of engineering judgement. The Caltrans Headquarters Pavement Program plans to develop training materials for the tool. For more information, link to the report. (4-3-17)
The Illinois State Tollway Authority has announced savings of approximately $218.5 million due to adopting the use of sustainable materials between 2004 and 2016. Illinois reused concrete pavement as a base for hot mix asphalt instead of conventional reconstruction along 32 miles of Interstate 88 to save $29.5 million. The tollway also has incorporated sustainable asphalt materials such as recycled asphalt shingles, and reclaimed asphalt pavement to reconstruct and widen the I-90 and I-39 tollways and construct shoulder lanes. In addition, the authority rebuilt the west end of I-90 with higher levels of supplementary cementitious materials which saved the state $8 million. For more information, link to the report. (June 2017)
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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