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- W619509752 abstract "Deflection basins from any nondestructive testing device can be characterized by parameters that describe the structural characteristics of an existing pavement. An exponential curve of the form Y equals A times e to the BX power, where Y is the deflection in mils and X is the radial distance in inches, approximates the deflection basins simulated from elastic layer theory and measured by the falling weight deflectometer (FWD). The coefficients A and B describe the structural characteristics of the pavement. Usually, a pavement with a stiffer upper layer or layers is indicated by a lower A value, whereas a stiff subgrade or the presence of a rigid bottom at a shallow depth (or both) is indicated by a higher B value. The value of the coefficient of determination for the exponential fit, R-squared, was found useful for judging the suitability of an FWD-measured basin for backcalculation of layer moduli in a deflection-matching technique. Generally, a low value of R-squared for an exponential curve fitted to an FWD-measured basin indicates that there will be a high error in the backcalculation of layer moduli using elastic layer theory. Guidelines are presented for using the value of R-squared to indicate the error between measured and computed deflections that can be expected during a backcalculation analysis." @default.
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- W619509752 date "1991-01-01" @default.
- W619509752 modified "2023-09-28" @default.
- W619509752 title "CHARACTERIZATION OF FALLING WEIGHT DEFLECTOMETER DEFLECTION BASIN" @default.
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