A Statistical Analysis of Georgia's HMA Quality Assurance Proccess

Abstract

In the recent years, there has been a push towards allowing contractors to use their own test results in the quality assurance process of Departments of Transportation (DOTs). While this movement saves the states money due to less testing, it has often been wondered if the contractor’s data compare well with GDOT data. An analysis was conducted on hot mix asphalt data for the 2003 construction year in the state of Georgia to evaluate statistically significant differences between the contractor’s and GDOT’s data with the purpose of evaluating Georgia’s QA process and contractor work. It was seen that while the contractor’s means compared well, significnat statistical differences were found with variances.