Review of the Bituminous Reference Sample Program of the AASHTO (American Association of State Highway and Transportation Officials) Materials Reference Laboratory

摘要

Background information on the development of standard specifications and methods of test, the AASHTO and the AMRL, is presented to give a historical perspective and to identify the need for the program. Details concerning its operation are reviewed. The coefficients of variation derived from the analysis of laboratory test data from a number of selected tests are plotted and evaluated. The value of the laboratory rating system and the laboratory performance charts which have been developed is discussed. Conclusions are made regarding the effectiveness of the program and the accuracy of established test precision limits.