Portland Cement Concrete Overlays. State of the Technology Synthesis

摘要

This report presents the latest information on the design, construction, and performance of Portland cement concrete (PCC) overlays. It describes the four types of PCC overlays that are commonly used in highway pavement applications: bonded PCC overlays, unbonded PCC overlays, conventional whitetopping, and ultra-thin whitetopping. Recommended applications, critical design elements, current overlay design methodologies, recommended construction practices, and performance highlights are described for each overlay type. Information is also provided on the selection of PCC overlays as possible rehabilitation alternatives for existing pavements. Taken together, this document address the current 'state of the technology' of PCC overlays placed on both existing PCC pavements and on existing hot-mix asphalt (HMA) pavements. As described in this document, there has been significant progress over the last decade in improving the performance of PCC overlays. However, there remain several critical design and construction areas that are currently not adequately addressed, and these suggested future research needs are listed in this report.