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.


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    Title :

    Reduced Confined Dynamic Modulus Testing Protocol for Asphalt Mixtures


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2004-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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