Paired Measurement Strategy to Analyze the Effects of Construction Specification Changes on Quality of HMA Surface Courses;Research rept. Sep 98-Aug 00

摘要

The primary objective was to develop and test a 'Measurement Strategy' for evaluating the relative degree of success of new hot mix asphalt (HMA) pavement construction specifications using information from the Texas Department of Transportation (TxDOT) Pavement Management Information System (PMIS) database. The specific reason for developing a Measurement Strategy was for use in comparing relative performance as a function of time of HMA pavements constructed under Item 340 with pavement constructed using the newer quality control/quality assurance (QC/QA) specifications. Researchers developed a paired analysis method and 30 pairs of pavements were identified to test the method. A paired set of pavements is defined herein as an Item 340 pavement and an QC/QA pavement that have similar locations, substrates, thicknesses, mixture type, and traffic but probably were constructed at different times by different contractors. Pavement performance information on these paired pavements from the TxDOT PMIS database was used in a statistical analysis in an attempt to determine which type of specification provided the best performing pavement. A second measurement strategy was developed and provided to TxDOT which uses a general analysis method; that is, it considers all of the appropriate pavements in the PMIS database, even if the number of pavements prepared using the different specifications are unequal.