Guidebook for Application of Polymer-Modified Asphalt Overlays: From Decision-Making to Implementation, ST-015

(2024) Guidebook for Application of Polymer-Modified Asphalt Overlays: From Decision-Making to Implementation, ST-015. Transportation, Department of

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Abstract

After the successful experiences of multiple transportation agencies in adopting the usage of polymer-modified asphalt (PMA) cement overlays, now is the time to advocate for the implementation of this pavement preservation technique. Despite the affirmative endorsements from numerous departments of transportation (DOT), a structured process for systematically selecting PMA overlays under specific pavement and service conditions remains conspicuously absent. Incorporating the application of PMA overlays, or any analogous treatment, into agencies’ decision-making frameworks hinges upon comprehensive insights into the treatment’s performance and cost-effectiveness across diverse pavement types and varying service conditions. Regrettably, quantitative data to substantiate objective decision-making remain limited. This research endeavors to lay the groundwork for the integration of PMA overlays into agencies’ overall pavement preservation strategies. This goal is accomplished through the development of the guidebook presented herein, which offers insights into the implementation and efficacy of PMA overlays. The objective of this guidebook is to expedite the assessment of potential benefits conferred by PMA overlays under diverse conditions. In turn, this facilitates informed decisions by pavement engineers on whether they represent a viable and efficient pavement preservation strategy. To meet the objectives, the research team agglomerated the collective experiences of US transportation agencies in utilizing PMA overlays and reviewed pertinent literature to foster a framework for selecting the optimal timing and techniques for PMA overlay treatments. The researchers conducted in-depth scrutiny of prior PMA overlay endeavors, particularly the experiences of state DOTs, and direct engagements with DOT engineers. This comprehensive approach primarily sought to accrue pavement performance data before and after the placement of overlays. Secondly, it aimed to uncover insights into success stories, design methodologies, material choices, and construction practices. The amassed data set and analytical findings serve as the foundation for quantifying treatment effectiveness, measured in terms of extended service life and benefit-cost ratios.