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- W2061114911 abstract "The dynamic modulus ( E * ) of asphalt mixtures correlates well with field performance. Studies have shown that in comparisons of dense-, gap-, and open-graded mixtures, confined E * ( C-E * ) tests are recommended to rank and compare the expected field performance of the different mixtures. Unfortunately, C-E * tests are harder to perform than unconfined E * ( U-E * ) tests. Factors such as time, availability of equipment, technical complexity, and financial needs must be carefully considered when a confined laboratory-testing program is being proposed. The objective of this study was to develop a simple method by which C-E * values could be predicted from U- E * results with a reduced number of C- E * tests. The methods analyzed were developed by using E * test results conducted on nine asphalt rubber mixtures at different confinement levels and were validated by using three conventional densegraded mixes previously tested at Arizona State University. The U- E * and C- E * test results generally showed a linear relationship with the applied bulk stress and were almost parallel regardless of the confinement level. An approach to predict a C- E * relationship from U- E * test data was developed by using one (or two) confined test(s) instead of the five required by current test protocols. The methods investigated potentially would provide a decrease in laboratory testing time of at least 50%. Because some level of laboratory confinement is recognized for gap- and open-graded mixes, the methods investigated in this study also may prove helpful in the development of more accurate pavement distress prediction models." @default.
- W2061114911 created "2016-06-24" @default.
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- W2061114911 date "2004-01-01" @default.
- W2061114911 modified "2023-09-26" @default.
- W2061114911 title "Reduced Confined Dynamic Modulus Testing Protocol for Asphalt Mixtures" @default.
- W2061114911 doi "https://doi.org/10.3141/1891-18" @default.
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