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原文传递 Effect of FWD Testing Position on Modulus of Subgrade Reaction.

题名：	Effect of FWD Testing Position on Modulus of Subgrade Reaction.
作者：	RIAD, M. Y.; SHOUKRY, S. N.; WILLIAM, G. W.
关键词：	Pavement-condition; Subgrades-.;Calibration-; Highway-maintenance; Dowel-bars; Transverse-joints; Load-transfer; Efficiency-; Joint-testing; Diameters-.
摘要：	The current overlay design procedures specified by the AASHTO Pavement Design Guide depends upon evaluating the value of the Modulus of Subgrade Reaction (MSR) for the existing pavement. Accurate determination of the value of the modulus of subgrade reaction is highly desired for designing the required overlay thickness. As a rapid and convenient technique, FWD testing is in use by almost all state DOTs to evaluate the MSR for their existing pavements. The thickness of the overlay layer is determined based on the measured value of the MSR. Thus, it becomes apparent that accurate determination of the value of modulus of subgrade reaction is directly related to the economic efficiency of overlaid concrete pavements. Limited field data obtained from West Virginia instrumented concrete pavement section in Elkins indicate the wide variations in the measured values of the MSR can take place due to slab curling and the position of applying FWD impact load relative to the slab. At present time, there is no data available on the effect of temperature gradient through the slab thickness on the measured values of MSR. Additionally, it was noticed that the position of application of FWD impact on the slab might result in under estimation of the value of MSR and consequently a larger thickness of overlay.
报告类型：	科技报告