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Positive Practices, Lessons Learned, and Challenges When Implementing Balanced Design of Asphalt Mixtures: Site Visits
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Virtual site visits and interviews of seven key State Departments of Transportation (DOTs), along with material producers, consultants and paving contractors that serviced the agencies were conducted to learn more regarding the details of Balanced Mix Design (BMD) and performance tests implementation efforts. Successful practices documented from these virtual site visits were collected and synthesized into an overall process of implementing BMD as part of mix design approval and quality assurance (QA). This process comprises eight major tasks that are meant to present and summarize the activities that a State DOT may need to undertake to implement a BMD program depending on its organizational structure, staffing level, workspace, annual asphalt tonnage, as well as industry experiences and practices. Examples of positive practices, lessons learned, and challenges from States for the various tasks are presented. A list of research and deployment topics identified during the virtual site visits are also summarized.