A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of Initial Subgrade Variability on the Ohio SHRP Test Road. Interim Report for Continued Monitoring of Instrumented Pavement in Ohio
The Ohio Department of Transportation (ODOT) currently uses density and moisture measured with a nuclear density gauge as the principal criteria for approving subgrade construction in Ohio. This procedure is time consuming, thereby restricting the number of tests that can be performed, and the device is limited to measuring density in the top 12 inches of the material. When the subgrade on mainline sections of the Ohio SHRP Test Road was completed and accepted by ODOT in 1995, nondestructive tests (NDT) performed with the falling Weight Deflectometer (FWD) indicated considerable variation in stiffness within and between the 36 test sections in the SPS-1, SPS-2 and SPS-9 experiments. While this variation could be attributed to several factors, laboratory tests on subgrade samples demonstrated a definite sensitivity of stiffness to moisture. After being openend to traffic, four sections in the SPS-1 experiment experienced severe rutting in the subgrade. The most distressed areas in two of these sections studied in detail coincided with locations of low stiffness under the FWD load plate, either on the subgrade or on the completed pavement system. Had these areas been addressed during construction, it is likely the service life of these sections would have been extended significantly. Because of the speed of NDT and because it assesses the in-situ stiffness of the entire pavement structure, density-based specifications for subgrade construction should be replaced with NDT-based specifications.
Evaluation of Initial Subgrade Variability on the Ohio SHRP Test Road. Interim Report for Continued Monitoring of Instrumented Pavement in Ohio
The Ohio Department of Transportation (ODOT) currently uses density and moisture measured with a nuclear density gauge as the principal criteria for approving subgrade construction in Ohio. This procedure is time consuming, thereby restricting the number of tests that can be performed, and the device is limited to measuring density in the top 12 inches of the material. When the subgrade on mainline sections of the Ohio SHRP Test Road was completed and accepted by ODOT in 1995, nondestructive tests (NDT) performed with the falling Weight Deflectometer (FWD) indicated considerable variation in stiffness within and between the 36 test sections in the SPS-1, SPS-2 and SPS-9 experiments. While this variation could be attributed to several factors, laboratory tests on subgrade samples demonstrated a definite sensitivity of stiffness to moisture. After being openend to traffic, four sections in the SPS-1 experiment experienced severe rutting in the subgrade. The most distressed areas in two of these sections studied in detail coincided with locations of low stiffness under the FWD load plate, either on the subgrade or on the completed pavement system. Had these areas been addressed during construction, it is likely the service life of these sections would have been extended significantly. Because of the speed of NDT and because it assesses the in-situ stiffness of the entire pavement structure, density-based specifications for subgrade construction should be replaced with NDT-based specifications.
Evaluation of Initial Subgrade Variability on the Ohio SHRP Test Road. Interim Report for Continued Monitoring of Instrumented Pavement in Ohio
S. M. Sargand (author) / D. L. Wasniak (author) / T. Masada (author) / D. Beegle (author)
2000
148 pages
Report
No indication
English
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