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- W293700107 abstract "The Code of Federal Regulations for highways, specifically 23 CFR 637 Subpart B allows for the use of contractor quality control (QC) testing in the acceptance decision if validated by the owner agency’s verification testing and sampling. The SH 130 was the first design-build highway infrastructure project in Texas where contractor QC testing was used in the acceptance decision for all project-produced materials. A project-specific quality assurance program that addresses the Federal Highway Administration’s requirements was developed for the project. With the completion of the SH 130 and the 183A projects, Texas Department of Transportation (TxDOT) built upon lessons learned from those projects to develop a statewide quality assurance program for design-build projects. An enhancement to the previous owner verification process is the new three-tiered approach. Level 1 is applied to the tests which are strong indicators of performance and provides the highest level of confidence in the contractor’s QC testing through the running of continuous F- and t- tests. Level 2 is applied to tests that are secondary indicators of performance through running quarterly independent verification on the contractor’s QC test results. Level 3 is applied to tests with extremely low test frequencies where independent verification cannot be meaningfully performed or tests on materials whose risk of failure does not affect the long-term performance of the facility past the contractual maintenance obligations. While the previous design-build quality assurance programs served TxDOT well, this new approach is an enhancement that focuses verification efforts on tests that are better indicators of material performance." @default.
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- W293700107 date "2011-01-01" @default.
- W293700107 modified "2023-09-24" @default.
- W293700107 title "Texas DOT Design-Build Quality Assurance Program: Lessons Learned and Development of Three-Tiered Analysis Approach to Owner Verification" @default.
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