NCAT test track design, construction, and performance
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NCAT test track design, construction, and performance

Filetype[PDF-1.94 MB]


English
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  • Resource Type:
    Research Paper
  • Geographical Coverage:
    Alabama
  • Corporate Publisher:
    National Center for Asphalt Technology (U.S.)
  • Abstract:
    Empirical laboratory tests have been used for years to test hot mix asphalt (HMA) to determine the potential for various mixtures to perform well. As the amount of traffic has increased (higher volumes, higher loads, and increased tire pressures) the ability of these laboratory tests to evaluate potential performance has become more important. As the traffic has increased, better laboratory tests and material specifications have been developed to help ensure that high quality mixtures are produced. The Alabama DOT in conjunction with National Center for Asphalt Technology (NCAT) decided that a test track was the best approach to provide practical answers to existing performance issues. The primary objective of the test track was to provide an accelerated loading facility that could be used to rapidly test a large number of test sections simultaneously. This allows validation of laboratory tests and pavement design procedures under traffic similar to that which is observed on roadways. Unlike conventional efforts on public roadways, research at the NCAT Test Track is conducted on a closed-loop facility where axle loadings are monitored and environmental effects are similar for every mix. The Test Track (referred to occasionally as the Track) is the result of industry and government committing to work together to improve the quality of flexible pavements. The facility is expected to clarify the relationship between methods and performance such that design and construction policy in the future can be objectively guided by life cycle costs. The Alabama DOT funded the construction of the track at NCAT with anticipation that operation of the track would be a cooperative effort between several sponsors. Experimental sections on the 2.8 kilometer (1.7 miles) Test Track are cooperatively funded by external sponsors, most commonly state DOT?s, with subsequent operation and research managed by NCAT. References, 7 tables, 56 figures, 72 pages.
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