This report is concerned with the review of data generated on projects let under the statistically oriented end-result specifications (ERS) on asphaltic concrete and portland cement concrete. The review covered analysis of data for determination of price reduction for deficient material and overall variability of data. The analysis and evaluation indicated: (1) an overall reduction of less than 0.5 percent in the contract unit price for asphaltic concrete and portland cement concrete; (2) at least 74 percent of all projects meeting the requirements for 100 percent pay; (3) a significant decrease in overall price reduction for asphaltic concrete since the first evaluation of 1975; (4) some increase (from 1975) in non-uniformity in the production phase of asphaltic concrete with little or no difference in the compaction phase; (5) good to excellent control in production and testing of concrete used as critical concrete; and (6) a need for continual evaluation, such as the one presented here, for enhancement of the state's overall quality assurance system. /FHWA/.
Samenvatting