Light Weight Deflectometer Evaluation of Low-Volume Road Structural Deterioration under Rapidly Increased Traffic Patterns

Author:

Ordaz Margarita12ORCID,Doyle Jesse D.3ORCID,Howard Isaac L.1ORCID

Affiliation:

1. Richard A. Rula School of Civil and Environmental Engineering, Mississippi State University, Mississippi State, MS

2. Airfields and Pavement Branch, Geotechnical and Structured Laboratory, U.S. Army Engineer Research and Development Center, Vicksburg, MS

3. U.S. Army Corps of Engineers, Engineer Research and Development Center, CEERD-GMA, Vicksburg, MS

Abstract

When evaluating low-volume road (LVR) condition, there is not a tremendous emphasis on structural capacity, since deterioration is typically caused by environmental factors. However, in cases where LVRs experience rapidly increased traffic loading, structural condition becomes important. The research objective was to determine whether the light weight deflectometer (LWD) can be used as a structural evaluation tool for LVRs. This study explored three major factors that affect measurement of flexible pavement structural capacity: load-induced deterioration (e.g., rutting and cracking), soil moisture, and asphalt temperature. Four full-scale flexible pavement test items were constructed with varying base-course materials and layer thickness typical of LVR. Instrumentation was installed during construction to monitor moisture content, temperature, and ambient weather conditions. Accelerated traffic was applied with a 4-axle military truck. A total of 10,000 cumulative vehicle passes were completed. Falling weight deflectometer (FWD) and LWD testing equipment were utilized to measure pavement structural condition at selected traffic intervals. The LWD was shown applicable for LVRs experiencing accelerated traffic. The LWD is portable and is more efficient for LVRs when high rut depths are permitted. The LWD tracked trends of the FWD; therefore, the LWD, based on these experiments, can be recommended for use in lieu of FWD to assess structural condition in some LVR conditions.

Funder

U.S. Army Corps of Engineers

Publisher

SAGE Publications

Subject

Mechanical Engineering,Civil and Structural Engineering

Reference25 articles.

1. Sayers M. W., Gillispie T. D., Queiroz Q. A. V. The International Road Roughness Experiment: Establishing Correlation and a Calibration Standard for Measurements. World Bank, Technical Paper No. 45, 1986, pp. 453.

2. Investigation of thin flexible pavement response between traffic and the falling weight deflectometer (FWD)

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