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Evaluation of Louisiana's statistically based quality control and acceptance specifications for asphaltic concrete : final report.
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1998-09-01
[PDF-15.03 MB]
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Alternative Title:Evaluation of Louisiana's statistically based quality control and acceptance specifications for asphaltic concrete.
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Abstract:In 1971, the Louisiana Department of Transportation and Development initiated a statistically based specification system for asphaltic concrete using historically generated data. A Materials Test Data (MATT) reporting system was also started to archive all materials and construction data. This data was used to validate the specifications in 1975 and 1979 and to adjust the specification requirements for asphaltic concrete. Since 1987, major specification changes have been made and there have been improvements in equipment and operational control. This study was therefore conducted to review asphalt quality in terms of the current specifications, to evaluate the effectiveness of the current requirements and to propose future directions for specification compliance judgement and acceptance procedures. A particular aspect was to be an evaluation of the "unknown sigma" approach.
The study examines data for asphaltic concrete from the MATT system for the period 1987 to 1995. Quality was described in terms of the mean and standard deviation of the specification parameters affecting the payment for product. The proportion defective product to specification criteria was also estimated. This data is tabulated and graphed for Marshall stability, gradation, antistrip, density, and profile.
The study also developed operating characteristic curves for each of these five parameters and revealed the complexity of some. On the basis of the current quality capabilities a selection of simpler but equally rigorous new specification compliance criteria were formulated.
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