Performance-Related Specifications for Pavement Preservation Treatments (2017) / Chapter Skim
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42.1 Background Highway agencies are implementing performance specifications in highway construction standards to mitigate their risks. These specifications are based on construction- or material-related parameters known to relate to expected pavement performance.
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process for Developing prS Guidelines 5 requirements. The performance specifications can be classified into the following types (Scott et al.
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6 performance-related Specifications for pavement preservation treatments 6. Identify deficiencies in strategy, 7.
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process for Developing prS Guidelines 7 • Defining performance parameters and associated performance measures, • Defining testing methods and sampling plans that evaluate compliance, and • Using compliance test results in quality assurance programs. Each of these components must be determined through a detailed evaluation of candidate quality characteristics considered for inclusion in a performance-related specification.
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8 performance-related Specifications for pavement preservation treatments Step 5: Establish Incentive Strategies and Payment Mechanisms A performance-related strategy that reduces costs (i.e., maintenance and repairs) for a project and provides incentives to the contractor for performing quality work would motivate a contractor to produce high-quality work.
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process for Developing prS Guidelines 9 • Upon identification of possible risks, the agency and contractor need to coordinate the assignment of risk responsibility. Potential scenarios under which a risk may manifest itself should be determined, and an appropriate risk management and monitoring strategy should be developed.
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10 performance-related Specifications for pavement preservation treatments Guidelines for PRS Development Step 1 Treatment Selection Step 2a Identify and Select Candidate AQCs (Variables/attributes for the treatment material properties and construction process which can be related to expected performance) Step 2b Identify Performance Measures (Functional or structural performance measures which can be explained by the AQCs)
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process for Developing prS Guidelines 11 3. Establish relationships between quality characteristics and performance measures and determine performance limits.
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12 performance-related Specifications for pavement preservation treatments between pavement preservation and rehabilitation and reconstruction is needed for the following reasons: 1. The performance of preservation treatments significantly depends on the pre-existing pavement conditions.
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process for Developing prS Guidelines 13 Specify Test Methods Successful adoption of a PRS requires the use of an objective test method that can measure AQCs. Methods that provide quantitative results are preferable because the tests can be repeated to obtain the required information.
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14 performance-related Specifications for pavement preservation treatments characteristics. By definition, PWL is the percentage of a lot that falls above a lower specification limit (LSL)
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process for Developing prS Guidelines 15 Stages 1. Selection of preservation treatment 2.
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16 performance-related Specifications for pavement preservation treatments 6. Selection of quality measurement methods Two common quality measures: o LCC analysis of performance prediction models o Statistically based sampling and testing plans measuring variability Statistically based methods for pay adjustment factors more common (e.g., PWL)
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