STP1358: Monitoring Pavement Response and Performance Using In-Situ Instrumentation

    Chen, D-H
    Data Analysis Engineer and Assistant, Texas Department of Transportation, Design Pavement Section, Austin, Texas

    Bilyeu, J
    Data Analysis Engineer and Assistant, Texas Department of Transportation, Design Pavement Section, Austin, Texas

    Hugo, F
    Research Fellow, Center for Transportation Research, University of Texas at AustinInstitute for Transport Technology, University of Stellenbsoch, Austin, Texas

    Pages: 14    Published: Jan 1999


    Abstract

    The purpose of this paper is to present the effectiveness of in-situ instrumentation on diagnosing the pavement layer conditions under full-scale accelerated traffic loading. The test section is an in-service pavement (US281) in Jacksboro, Texas. Multi-Depth Deflectometers (MDDs) are used to measure both permanent deformations and transient deflections, caused by accelerated traffic loading and Falling Weight Deflectometer (FWD) tests. Four different FWD loads of 25, 40, 52, and 67 kN were applied in close proximity to the MDDs at various traffic loading intervals to determine pavement conditions. It was found that the majority of rutting occurred in the newly recycled asphalt mix. The aged (> 40 years) underlying base and subgrade layers contributed less than 30% to overall rutting. Only the top recycled asphalt layer underwent notable deterioration due to traffic loading. Up to 1.5 million axle repetitions, the test pad responded to FWD load almost linearly, not only over the whole pavement system but also within individual layers. However, under higher FWD loads, the percentage of total deflection contributed by the subgrade increased.

    Keywords:

    accelerated pavement testing, deflectometer, remix, instrumentation, load simulator


    Paper ID: STP14217S

    Committee/Subcommittee: D18.23

    DOI: 10.1520/STP14217S


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