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Title: REDUCED CONFINED DYNAMIC MODULUS TESTING PROTOCOL FOR ASPHALT MIXTURES
Accession Number: 00984571
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available 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 dense-graded 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.
Supplemental Notes: This paper appears in Transportation Research Record No. 1891, Bituminous Paving Mixtures 2004.
Monograph Title: Monograph Accession #: 00984553
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Sotil, AKaloush, K EWitczak, M WPagination: p. 153-162
Publication Date: 2004
Serial: ISBN: 0309094852
Features: Figures
(7)
; References
(13)
; Tables
(3)
TRT Terms: Uncontrolled Terms: Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials
Files: TRIS, TRB, ATRI
Created Date: Jan 18 2005 12:00AM
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