Composite Pavement Systems, Volume 1: HMA/PCC Composite Pavements (2013) / Chapter Skim
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1Executive Summary Types of Composite Pavement Systems Two composite pavement design strategies were determined to provide both excellent surface characteristics (low noise; very smooth, nonpolishing aggregates; and durability) that can be rapidly renewed and long-lasting structural capacity for any level of truck traffic.
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2while minimizing their disadvantages. The research in this study, which was conducted from 2007 to 2011, had the following key goals.
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3 • Construction: An initial 200-ft test section for PCC/PCC was built and the EAC surfaced prepared. The lessons learned were invaluable for building the main line, which was constructed in May 2010.
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4[50-mm]
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5 • Less expensive materials can be used in greater quantities in the lower layer, where they will contribute structurally without detracting from the quality and performance of the overall pavement. Studies in Spain provided valuable information on reflection cracking for HMA/RCC and HMA/CTB and the forming of joints in the RCC and CTB.
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6unmodified asphalt binders. The NCHRP 9-30A rutting models for HMA/PCC composite pavements were evaluated and recommendations made for additional research.
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7 error in HMA/CRC) , and all of these modifications have been incorporated into the DARWinME software.
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8cracks. No low-temperature transverse cracks were observed in HMA/JPC or HMA/CRC, and no longitudinal wheelpath cracks have been observed in HMA/PCC pavements.
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9 Informational Products Includes the final R21 reports (Volumes 1 and 2) and detailed appendices (including a previously published report on the European Survey of Composite Pavements by Tompkins, Khazanovich, and Darter in 2010)
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10 reduced severity of joint reflection cracks on comparative sections in Minnesota. Sawed and sealed joint projects were all in excellent condition and are highly recommended for thin asphaltic surfaces over jointed PCC.
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11 and more rapid renewal. In fact, fatigue cracks developed only on the exceptionally thin PCC layers on some experimental sections.
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12 Implementation Road Map The road to implementation includes continued monitoring of constructed composite test sections at MnROAD. Additional analysis of the instrumentation data and the performance data will be extremely useful for convincing highway agencies of the validity of the concepts, the design procedures, and the construction guidelines and specifications.
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13 to conventional concrete and asphalt pavements over the life cycle of the pavement. Together, the R21 reports, software, and guidelines provide information for these technologies to become widely adopted by the transportation community.
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