Statistical quality control and quality assurance evaluation of structural & paving concrete : phase I final report.
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2001-08-01
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Alternative Title:Statistical quality control and quality assurance evaluation of structural and paving concrete.
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Abstract:This report discusses the variability associated with the production, construction, and testing of structural and paving concrete. The study evaluated data from over 900 projects constructed between 1992 and 1999, representing over 25,000 lots. The data was collected from the DOTD computerized Materials Test Data Reporting System (MATT). The analysis also included an assessment of price reductions for nonconforming lots.
The analysis and evaluation indicated: 1) an overall price reduction of less than 0.2 percent for structure concrete and about 0.5 percent for paving concrete; 2) thickness of concrete cores to be the major contributor to the overall price reduction in paving concrete; 3) good control in the production and testing of structure concrete; and 4) increase in non-uniformity of paving concrete acceptance criteria.
Recommendations include 1) a need to maintain better control of the variability of paving concrete tests through the application of control charts and/or the variability of unknown types specifications and 2) a need for continued evaluation, such as the one presented here, for monitoring the overall quality control and quality assurance program of the DOTD.
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