This digest presents the two key products from research conducted under National Cooperative Highway Research Program (NCHRP) Project 1-28A, "Harmonized Test Methods for Laboratory Determination of Resilient Modulus for Flexible Pavement Design." The objective of Project 1-28A was to develop (1) a test method for measurement of the resilient modulus of hot mix asphalt (HMA) that harmonizes the procedure proposed by NCHRP Project 1-28 with the existing American Association of State Highway and Transportation Officials (AASHTO) TP31 method and the Federal Highway Administration (FHWA) Long Term Pavement Performance (LTPP) "Laboratory Start-Up and Quality Control Procedure" and (2) a test method for measurement of the resilient modulus of unbound granular base and subbase materials and subgrade soils that harmonizes the procedure proposed by Project 1-28 with the existing AASHTO TP46, T 292, and T 294 methods and the FHWA LTPP "Laboratory Start-Up and Quality Control Procedure." (Author/publisher) This report may be accessed by Internet users at http://gulliver.trb.org/publications/nchrp/nchrp_rrd_285.pdf
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