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Suggested Citation:"Summary ." National Academies of Sciences, Engineering, and Medicine. 2017. Performance-Related Specifications for Pavement Preservation Treatments. Washington, DC: The National Academies Press. doi: 10.17226/24945.
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1 S u m m a r y Performance-related specifications (PRS) are quality assurance specifications that describe the desired levels of key materials and construction quality characteristics that have been found to correlate with the long-term performance of the finished product, thus providing the basis for rational acceptance and price adjustments. Pavement preservation treatments are actions applied to preserve an existing roadway, slow future deterioration, and main- tain and improve roadway functional condition (without substantially increasing structural capacity). There are no widely accepted guidelines for PRS for pavement preservation treat- ments that correlate key engineering properties to treatment quality and long-term perfor- mance. Therefore, research is needed to develop guidelines to facilitate development and implementation of PRS for preservation treatments that directly relate key material and con- struction characteristics to expected as-constructed pavement performance. These guidelines will help highway agencies develop and incorporate PRS in preservation treatment contracts. Consequently, agencies will be able to (1) specify an optimum level of quality that represents the best balance of costs and performance and (2) establish quality-related pay adjustment factors, if desired. The objective of this research was to develop guidelines for use in preparing PRS for pavement preservation treatments for both flexible and rigid pavements. This research produced guidelines for use in preparing pavement preservation PRS. The guidelines identified several quality characteristics and performance measures for the most commonly used pavement preservation treatments. In addition, the report documents the rationale for selecting quality characteristics for a specific preservation treatment. Six preservation treatment types were short-listed for the development of PRS guidelines and examples—three were rigid pavement preservation treatments (diamond grinding, joint resealing, and dowel-bar retrofit) and three were flexible pavement preservation treatments (chip seal, thin overlay, and microsurfacing). Three approaches were adopted to estab- lish relationships between quality characteristics and performance measures: empirical, mechanistic-empirical, and performance-based laboratory and field test properties. These approaches were used to further develop relationships between quality measures, service life extensions, and pay adjustment factors. The expected pay curves were developed based on the quality measures and were used to establish acceptable and rejectable quality levels. The pay adjustment factors were evaluated to ensure fair payments for the quality of work produced. Further, the effects of sampling plans, methods, and sample sizes on the estima- tion of quality measures were evaluated and the associated risks were quantified. Recommendations were made to distinguish pavement preservation treatment PRS development from rehabilitation and reconstruction of flexible and rigid pavements. Rec- ommendations were also documented for using a specific sampling plan and method and establishing the sample size for destructive and non-destructive data collection methods for measuring acceptance quality characteristics. Performance-Related Specifications for Pavement Preservation Treatments

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TRB's National Cooperative Highway Research Program (NCHRP) Research Report 857: Performance-Related Specifications for Pavement Preservation Treatments presents guidelines for use in preparing performance-related specifications (PRS) for pavement preservation treatments and, if desired, determining pay adjustment factors. Although PRS have been used for the construction of pavements, their use for pavement preservation treatments has been limited. These guidelines will help highway agencies develop and incorporate PRS in preservation treatment contracts, specify an optimum level of quality that represents a balance of costs and performance, and, if desired, establish quality-related pay adjustment factors.

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