Round 1 Type 1 Unbound Granular Base Course Proficiency Sample Program

摘要

Strategic Highway Research Program (SHRP) Protocol 46, 'Resilient Modulus ofUnbound Granular Base/Subbase Materials and Subgrade Soils' was the specified procedure for laboratories performing resilient modulus tests on research samples of unbound granular base course material obtained from long term pavement performance (LTPP) field sites. P46 requires a test system which includes a triaxial pressure cell component, a closed loop electro-hydraulic repeated load component, and certain load and specimen response control, measurement, and recording components. A set of eight test samples was shipped to each of nine participating laboratories together with appropriate instructions. All participants were required to complete testing of the Type I synthetic reference sample set prior to testing the Round 1 proficiency samples. Worksheets, supporting data, analyses, final comments, and conclusions are presented. A complete set of proficiency sample statements in AASHTO/ASTM format are provided.