Preservation Approaches for High-Traffic-Volume Roadways (2011) / Chapter Skim
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• Preservation can be done more rapidly than rehabilitation, with fewer adverse effects on the traveling public. Admittedly, there are also challenges to the use of preservation strategies on high-traffic-volume roadways (e.g., a smaller toolbox of treatments that can be used successfully, more difficult treatment construction because of shorter available closure times, less available information on treatment performance and life, increased risk, and less available guidance on preservation strategies)
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Detailed guidelines on pavement preservation strategies for high-traffic-volume roadways were then developed using the state of the practice and a comprehensive treatment selection framework and process. Findings Literature Review Results of the literature review revealed several important items concerning pavement preservation practices in general and the use of preservation treatments on high-traffic-volume roads in particular.
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Treatments considered most inappropriate for use on high-traffic-volume facilities by survey respondents included fog seal, scrub seal, slurry seal, chip seal, and ultra-thin whitetopping for HMA-surfaced pavements and thin HMA overlay, ultra-thin bonded wearing course, and thin PCC overlays for PCC-surfaced pavements. The survey results indicated that the top three deficiencies addressed by preservation treatments on HMA-surfaced pavements are light and moderate surface distress (i.e., various forms of cracking)
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Selection of the Preferred Preservation Treatment • Conduct cost-effectiveness analysis Benefit-cost analysis Life-cycle cost analysis (LCCA) • Evaluate economic and noneconomic factors Pavement Preservation or Major Rehab?
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• Successful selection of projects and preservation treatments for high-traffic-volume roadways requires that Treatment functions be properly matched to pavement conditions; Potential effects of traffic level and climatic conditions on expected treatment performance be properly assessed; Project construction constraints be carefully examined in relation to the limitations of the treatments; and Treatment cost-effectiveness and other factors be properly and methodically considered. Recommendations Key recommendations from this study include the following: • Develop a more comprehensive treatment–pavement condition matching matrix; • Improve estimates of treatment performance and unit costs; and • Investigate more thoroughly the impact of pavement condition, traffic level, and climatic condition on treatment performance.
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