United States Department of Transportation
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Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, Volume IV: Appendix C, Material Characterization for Superheavy Load Movement Analysis
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2018-10-01
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[PDF-1.53 MB]
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OCLC Number:1076363360
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Abstract:The movement of superheavy loads (SHLs) has become more common over the years, since it is a vital necessity for many important industries, such as chemical, oil, electrical, and defense. SHL hauling units are much larger in size and weight compared to standard trucks. SHL vehicles’ gross vehicle weights may be in excess of a few million pounds, so they often require specialized trailers and components with nonstandard spacing between the tires and axles. Accommodating SHL movement requires the determination of whether the pavement is structurally adequate and involves the analysis of the likelihood of instantaneous or rapid load-induced shear failure. As part of this Federal Highway Administration project, Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, procedures for characterizing properties of the existing pavement layers were developed. This report describes the material characterization required to predict pavement responses (stresses, strains, and deflections) within the pavement structure when subjected to SHL-vehicle movement. An overall step-by-step procedure is presented for determining the damaged dynamic modulus master curve for the asphalt-concrete layer. An analogous procedure is also presented for determining the resilient modulus of unbound materials as a function of the state of stresses based on falling weight deflectometer measurements.
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