Composite Pavement Systems, Volume 2: PCC/PCC Composite Pavements (2013) / Chapter Skim
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1Types 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 under this study, which was conducted from 2007 to 2011, accomplished 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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4high-quality dense-graded WMA layer was placed and bonded to the newly placed 9-in.
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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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6three transfer functions did a fair job of predicting the measured rutting values using mixture properties and other pavement layer properties extracted from project files. Thus, the three rut depth transfer functions described and included in NCHRP 9-30A are believed to be reasonable for composite pavements.
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7 existing 64 sections located in the United States, Canada, the Netherlands, Germany, and Austria. The existing global calibration factors were determined to be adequate.
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8Construction and Materials Products Construction specifications and guidelines were developed as part of construction at MnROAD and UCPRC for use by agencies considering constructing new HMA/PCC and PCC/PCC composite pavements. These include two-lift wet-on-wet construction of PCC/PCC pavements, timing and sequencing of operations, texturing procedures and related guidelines, guidelines for paving the stiffer lower lift PCC and the thin upper lift, saw cutting of joints, and the challenging exposed aggregate brushing technique.
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9 Other Products Three test sections (two PCC/PCC and one HMA/PCC) were constructed at MnROAD with various surface textures (exposed aggregate, conventional grind, next-generation grind, HMA)
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10 of HMA/JPC and HMA/CRC composite pavements for a wide range of heavy truck traffic in their first performance period. The following is a brief summary of the field performance of HMA/PCC type of composite pavements: • Relatively thin asphaltic surfaces that have performed well include a wide variety of types and thicknesses under heavy traffic: 1- to 2-in.
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11 Table ES.2. Examples of "Long-Life" HMA/PCC Composite Pavements Over Several Performance Periods Composite Pavement; Age and No.
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12 A brief summary of the field performance of PCC/PCC type of composite pavements is as follows: • Relatively thin high-quality concrete surfaces include a variety of types and thicknesses: 4 2- to 3-in. PCC over JPC performed well for more than 18 years under very heavy traffic.
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13 reduced that lowers top-down fatigue damage in PCC) ; these composites rarely show any low temperature transverse cracking (they are bonded to the PCC)
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