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Variation in backcalculated layer moduli is somewhat greater within the Modulus-program than the Elmod-program. Consequently, the Modulus-program yields higher values for asphalt layer modulus than the Elmod-program. From a comparison of backcalculated layer moduli from the two programs at Finnish standard wheel load of 50 kN, it is concluded that higher subgrade modulus values are obtained with the Elmod-program than with the Modulus-program. Basic concepts of the two backcalculation programs used in this study, Modulus and Elmod, are discussed, and collection of input data for the programs is described. First, a brief look is made into the material models, which describe the behaviour of pavement layer materials. In this study, a comparison of two programs with different calculation methods, Modulus and Elmod, is made using deflection data derived from 43 SHRP-LTPP (Strategic Highway Research Program, Long-Term Pavement Performance) test sections. Most likely due to differences in the loading conditionsĪbstract = "Backcalculation programs are used for evaluation of pavement layer moduli from falling weight deflectometer (FWD) measurements. Measured strains under moving wheel load from the fieldĪt Virttaa test site. It was found, thatĬalculated strains from the two programs agree very well,Įven though the calculated moduli are quite different.Ĭalculated strains from FWD loading were compared with (BISAR) with layer moduli from the Modulus-program as Highest in the base course of unbound pavement layers.Ĭritical strains were calculated using the linear program Of pavement layers, since the stress level is also The baseĬourse modulus was found to be the most stress-sensitive Using the FWD at four different loading levels. Stress-sensitivity of paving materials was studied by Is somewhat greater within the Modulus-program than the Higher values for asphalt layer modulus than theĮlmod-program. Obtained with the Elmod-program than with the Is concluded that higher subgrade modulus values are Two programs at Finnish standard wheel load of 50 kN, it In this study, Modulus and Elmod, are discussed, andĬollection of input data for the programs is described.įrom a comparison of backcalculated layer moduli from the Which describe the behaviour of pavement layer materials.īasic concepts of the two backcalculation programs used SHRP-LTPP (Strategic Highway Research Program, Long-Termįirst, a brief look is made into the material models, Programs with different calculation methods, Modulus andĮlmod, is made using deflection data derived from 43 Pavement layer moduli from falling weight deflectometer Copyright © National Academy of Sciences.Backcalculation programs are used for evaluation of
PAVEMENT BACKCALCULATION BISAR PDF
Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. 1384, Strength and Deformation Characteristics of Pavement Structures.
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