Quantifying the Effects of Preservation Treatments on Pavement Performance (2018) / Chapter Skim
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From page 5... ...
5 Information relevant to pavement performance measures and preservation treatments was reviewed in order to establish a reasonable body of knowledge for use in the evaluation, validation, and testing of the measures, and for the development of guidelines for their implementation. The following three activities were performed: • Review of literature available from various sources.
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6 Quantifying the Effects of Preservation Treatments on Pavement Performance • Fifteen states used at least one individual pavement condition measure with ride quality, cracking, and rutting being the most common, and 24 states used at least one composite pavement condition measure with a form of the Pavement Serviceability Rating/Index (PSR/PSI) and Pavement Condition Index/Rating (PCI/PCR)
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Review of Existing Practices and Recommended Measures 7 of rehabilitation decisions by identifying preventative or minor rehabilitative treatments prior to the time at which only very expensive alternatives can be considered. This capability has improved overall average network pavement condition index, remaining service life, and objectivity of decision-making processes.
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8 Quantifying the Effects of Preservation Treatments on Pavement Performance • RSL. This measure is calculated as the variation of a reference year from the expected year for a LLCC activity.
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Review of Existing Practices and Recommended Measures 9 The State of Queensland, Australia uses an asset consumption ratio (ACR) , which is the value of infrastructure assets divided by gross current replacement cost of infrastructure assets (Proctor et al.
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10 Quantifying the Effects of Preservation Treatments on Pavement Performance In all, 33 of 50 (or 66%) state highway agencies and 9 of 13 (or 69%)
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Review of Existing Practices and Recommended Measures 11 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Surface abrasion Bonded wearing course (Nova Chip) Patching Mill and fill Other seal Slurry seals Fog seals Crack seal Microsurfacing Chip Seal Thin overlays Percent of Respondents Total Number of Respondents (n)
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12 Quantifying the Effects of Preservation Treatments on Pavement Performance • Other measures (e.g., environmental, user satisfaction, etc.) derived from/driven by individual and/or composite performance measures and asset type measures.
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Review of Existing Practices and Recommended Measures 13 • Surface texture – a measure of the differences in height of the pavement surface caused by aggregates (macro texture) or by small changes in particle shape of the aggregate or binder (micro texture)
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14 Quantifying the Effects of Preservation Treatments on Pavement Performance • Historical cost of pavement service – a measure not based on pavement condition measures, but an evaluation of past costs to identify pavement segments that may be candidates for preservation versus those that may require rehabilitation. • Expected cost of future pavement rehabilitation – similar to LCC, a measure of the cost of future rehabilitation needs based on decisions made in the present.
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Review of Existing Practices and Recommended Measures 15 Finally, the literature review revealed two key uses for performance measures, as illustrated in Figure 5. Specifically, performance measures should have the ability to be used to select maintenance actions for specific projects, and also to be aggregated over a pavement network to compare against an agencies strategic goals.
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16 Quantifying the Effects of Preservation Treatments on Pavement Performance goals. For example, safety is a strategic goal for many agencies, and pavement friction has been shown to be directly related to the expected number of crashes along the pavement segment (de Leon Izeppi et al.
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Review of Existing Practices and Recommended Measures 17 have varying practices as to what should be included in that type. For example, different results were obtained when the immediate change in longitudinal cracking following a chip seal application was evaluated by some agencies.
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