Type I Unbound Granular Base Synthetic Reference Sample Program

摘要

All laboratories conducting tests for the LTPP program were required to beaccredited by the AASHTO Accreditation Program (AAP). AAP includes site inspections of equipment and procedures, and participation in applicable proficiency sample testing. A few critical LTPP tests were not addressed fully by the AAP, and LTPP decided to conduct supplemental testing. The Type 1 Unbound Granular Base Synthetic Reference Sample Program was approved for implementation as one such supplemental testing program. SHRP Protocol P46 as the specified test procedure for laboratories performing resilient modulus tests on samples of unbound granular base material obtained from LTPP field sites. P46 requires a test system which includes a triaxial pressure cell component, a closed loop electro-hydrualic repeated load component, and certain load and specimen response control, measurement, and recording components. Worksheets, supporting data, analyses, final comments, and conclusions are presented. A complete set of proficiency sample statements in AASHTO/ASTM format are provided.