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Development of Balanced Mixture Design Index Parameters and the Flex Suite of Performance Analysis Tools for Asphalt Pavements – Volume I
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2024-06-01
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[PDF-7.85 MB]
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Edition:Final Report
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Abstract:This report documents research to advance mechanistic models, performance analysis and evaluation, and design methodologies to aid agency efforts to understand asphalt pavement performance. The research team developed FlexMAT™ version 2.1 and FlexPAVE™ version 2.0 as the material-level and pavement-level analysis tools, respectively. FlexPAVE 2.0 includes the simplified viscoelastic continuum damage model for fatigue and thermal cracking, the permanent strain shift model for rutting, and the NCHRP 09-54 aging models. FlexMAT 2.1 develops the input material properties for FlexPAVE 2.0 seamlessly. Sapp and the Rutting Strain Index are the cracking and rutting indexes, respectively, which aid balanced mix design (BMD) and improve performance analysis. These two indexes’ threshold values are a function of traffic level, using more than 100 different asphalt mixtures. The team used the four corners concept to develop performance-volumetrics and index-volumetrics relationships to use as the foundation for BMD methods. The team employed Bayesian inference-based Markov Chain Monte Carlo technique uncertainty analysis to develop a reliability framework for distress predictions using FlexPAVE 2.0 and also developed PASSFlex™ to support the steps of a performance evaluation on a project. One of the performance protocols the TFRS-01 project recommended was implemented into PASSFlex. The research team performed three shadow projects in concert with the Western Federal Lands Highway Division, Maine Department of Transportation, and Missouri Department of Transportation to introduce the asphalt mixture performance tester suite of performance tests and performance models. This volume is the first in a series. The other volume in the series is FHWA-HRT-24-111: Development of Balanced Mixture Design Index Parameters and the Flex Suite of Performance Analysis Tools for Asphalt Pavements—Volume II
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