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7 Admittedly, there are also challenges to the use of preser- 2. Develop criteria to identify best practices; apply such cri- vation strategies on high-traffic-volume roadways, including teria to the data obtained during the literature search and the following: survey. 3. Submit an interim report summarizing the results obtained There is a smaller set of materials and procedures that can by completing Tasks 1 and 2. be employed successfully on high-traffic-volume roadways. Shorter available closure times for busy roadways make Phase II treatment construction more complicated. 4. Develop guidelines for pavement preservation approaches There is less available information on the life and perfor- for high-traffic-volume roadways. mance of treatments used on high-traffic-volume roadways. 5. Submit a draft final report that documents the entire There is an increased risk (because of the higher traffic research effort. volumes and speeds) should failure occur. 6. Submit a final report that addresses SHRP 2 comments on Less guidance is available on the successful implementation the draft final report. of preservation strategies on high-traffic-volume roadways. In Phase I, an extensive literature search and review was Nonetheless, it is believed that the benefits of practicing undertaken, resulting in a comprehensive selection of references preservation on high-traffic-volume roadways outweigh the regarding pavement preservation practices from the last 5 years. challenges, and it is worthwhile to take steps to increase or In addition, a questionnaire was developed and distributed improve the practice of pavement preservation on these in September 2008 to all 50 SHAs, several large municipalities, roadways. seven Canadian provinces, international practitioners, and This research was conducted to identify and advance prac- several industry representatives. The purpose of the question- tices that lead to higher-volume roadways being maintained naire was to obtain information on current pavement preser- in serviceable condition for longer periods of time before vation practices for high-traffic-volume roadways from North rehabilitation is needed, at a lower cost, in a safer manner, and American and international practitioners. with less disruption to the traveling public. The study was part Information from the compiled literature and the question- of the second Strategic Highway Research Program (SHRP 2) naire survey was summarized and analyzed to identify the Renewal focus area, which addresses the need to complete current state of practice for rural and urban high-traffic- long-lasting highway projects with minimal disruption to the volume roadways on both portland cement concrete (PCC) traveling public. SHRP 2 Renewal research has a focus of surfaced and hot-mix asphalt (HMA)surfaced pavements. "applying new methods and materials for preserving, rehabil- Criteria were developed and applied to focus on preservation itating, and reconstructing roadways. . . . Alternative strategies approaches that are currently successfully implemented and for contracting, financing, and managing projects, and miti- others that have the potential to be successful but have not gating institutional barriers also are part of the emphasis on been regularly deployed. Results of these activities, along with rapid renewal" (SHRP 2 2007). an updated Phase II work plan, were documented in a draft interim report. Research Objectives In Phase II of the project, detailed guidelines on pavement The main objective of this study was to develop guidelines on preservation strategies for high-traffic-volume roadways pavement preservation strategies for high-traffic-volume road- were developed. These guidelines, entitled Guidelines for the ways that can be used and implemented by public agencies. Preservation of High-Traffic-Volume Roadways, evolved from A secondary objective was to identify promising pavement the state of the practice identified in Phase I and incorporated preservation strategies for application on high-traffic-volume various methodologies for evaluating treatment suitability at the roadways that might not commonly be used and to make project level, based on several decision factors. Recommended recommendations for further research opportunities. procedures for evaluating treatment cost-effectiveness were also incorporated. Research Scope and Approach Overview of Report To accomplish the stated objectives, the project was divided into two phases of work consisting of the following tasks: Including this introductory chapter, this report is presented in five chapters. Chapter 2 describes the information-gathering Phase I activities and presents a summary of the findings of those 1. Identify the state of the practice via a national and inter- activities. Chapter 3 discusses the development of preservation national literature search and survey. treatment selection guidelines through a state-of-the-practice

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8 synthesis that provides support for the recommendations used in the study. Appendix B contains the questionnaire used made in the guidelines. Chapter 4 discusses the application to survey highway agencies about their preservation practices. of the guidelines, focusing on potential impediments to Appendix C provides a detailed breakdown and discussion of implementation and successful ways of overcoming those the preservation survey responses. Appendix D is a short dis- impediments. Finally, Chapter 5 presents the study's conclu- cussion of several new or limited-use pavement preservation sions and recommendations, including suggestions for future treatments. The report also provides a glossary of terms. research of preservation-related policies and practices. The detailed guidelines developed in this study are provided The report includes four appendices. Appendix A is an in a separate publication, Guidelines for the Preservation of annotated bibliography covering the key source documents High-Traffic-Volume Roadways.