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- W67758072 abstract "Four Long Term Pavement Performance monitoring sites, part of the Strategic Highway Research Program (SHRP), were investigated in Texas with ground penetrating radar (GPR) to determine asphalt and base layer thicknesses as well as base moisture content. It was found that, with coring, the GPR could determine asphalt layer thicknesses to plus or minus 0.11 in. This accuracy is reduced to plus or minus 0.32 in. if the GPR results are not calibrated with cores. The base thicknesses could be determined to plus or minus 0.99 in. The data obtained during this survey indicated that significant variations in layer thicknesses were present within the 500-ft SHRP sections. Practical limitations in the data collection process have forced SHRP personnel to treat pavement thicknesses as shown on plans, or obtained during the drilling and sampling process, as representative of the entire section, even though it is recognized that this may not be true. Deflection data currently are being gathered on the SHRP sites and will be used to backcalculate the material properties of the pavement layers. Values for material properties obtained through the backcalculation of deflection basins are extremely sensitive to pavement layer thickness. It was the intent of this study to quantify the errors introduced by variations in pavement layer thicknesses that are not accounted for in the backcalculation process. It was found that errors of up to 100% in pavement layer moduli were possible when comparing the moduli obtained using GPR measured thicknesses and moduli obtained using SHRP data base thicknesses. It was also found that deflection basins alone are not a good indicator of layer thickness variations and that a good fit between measured and calculated deflection basins is not a good indicator of the correctness of the moduli values. The paper concludes by recommending that some method be investigated to quantify layer thickness variations on SHRP sites before using the deflections for backcalculation purposes." @default.
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- W67758072 date "1992-01-01" @default.
- W67758072 modified "2023-09-24" @default.
- W67758072 title "ASPHALT THICKNESS VARIATION ON TEXAS STRATEGIC HIGHWAY RESEARCH PROGRAM SECTIONS AND EFFECT ON BACKCALCULATED MODULI" @default.
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