Texas State University



Research Project Statement 16-237 FY 2016 Annual ProgramTitle:Develop New Methods for Material Acceptance on Design-Build ProjectsThe Problem:The construction industry is losing qualified laborers, as well as inspectors and testing technicians. There are not enough trained and qualified laborers, inspectors and testers to replace them. There has been a trend by owners to save money by downsizing their construction quality assurance (QA); i.e., types and number of manpower, testing programs, documentation, and data gathering efforts, or handing QA over to the contractor. The FHWA has allowed state DOT’s to use contractor material tests for acceptance, as long as they are validated by owner tests in accordance with FHWA Technical Advisory T6120.3, Use of Contractor Test Results in the Acceptance Decision, Recommended Quality Measures, and the Identification of Contractor/Department Risks, which is based on 23 CFR 637 - Construction Inspection and Approval.On design-build projects, this process has led to a very complicated QA program that requires contractor quality control and quality assurance (QC/QA) materials testing laboratories and owner verification , independent assurance and referee labs; i.e., five labs per project. TxDOT implemented the Technical Advisory with the TxDOT Quality Assurance Program with an Optional 15-year Capital Maintenance Agreement supported by the Design Build Quality Assurance Program Implementation Guide. TxDOT has implemented this testing program on over 10 design-build projects since 2000, and found that validating contractor’s testing using the F- and t-tests for statistical analysis is very complicated. This leads to a lot of extraneous work that reveals little about the quality of the product. Often times, it is unknown whether the tests are not validating until it is too late to take action. The f and t tests statistical analysis works well in the manufacturing arena, where it was developed, but is not well suited for construction materials testing.Under current practices employed by the TxDOT Construction Division, Materials & Pavements Section, the following approach for materials testing is as follows:Take one pool of test results.Select a group of test results as the QC results.Select a second group of test results as the Acceptance results (a smaller data set).Determine the mean and standard deviation of the two selected groups of data (remember they are randomly drawn from the same data set).Perform F- and t-tests on the two data sets.Sometimes the tests show a fail and sometimes they show a pass.How can there be fail and pass when the purpose of the tests is to statistically show if the two sets of data come from the same population of material? The standard deviation is calculated from a randomly selected pool of test results and then the F- and t-tests are performed against the selections. This is to show how the F- and t-tests can show differencing results out of the same pool of data. In other words, this proves that the F- and t-tests are a bogus measure of comparison.If TxDOT does not follow this very lengthy and complicated process, TxDOT is at risk of losing federal funding. This cumbersome validation process impacts project cost, schedule and quality.TechnicalObjectives:This research will provide a new strategy or methodology for accepting materials on design-build projects. This new strategy or methodology should also help the owner define what risk is involved for construction materials acceptance. Focus should be on eliminating the very complicated current method of having to validate contractor tests with owner tests, or at least find a replacement for the F- and t-test, which is used in determining if the two material test data sets do validate.The research objective will be achieved through the following:Conduct a review of past and current studies for construction material acceptance.Identify current practices and innovative strategies or methods to for construction material acceptance on design-build projects.Identify benefits, costs, and risks to highway agencies, contractors, and the traveling public for not having appropriate Construction material acceptance on design build projects.Evaluate the various strategies and methods for accepting materials on design build projects based on risk and manpower limitations.Develop new strategies or methods for construction materials acceptance on design build projects.Research should address the following questions: Is there a better process to use contractor tests in acceptance?Is TxDOT accurately measuring the risk of using contractor tests, and how should TxDOT measure the risk?Are the F- and t-tests the only way to statistically validate contractor material tests?What methods are there to allocate more flexibility to the contractor or owner for construction, material testing, and acceptance?How does this increase in flexibility effect risk?DesiredDeliverables:Value of Research (VoR) that includes both qualitative and economic benefits.A model or method to determine risk and cost if we do not get the materials quality we required. A new method, strategy, test procedures to evaluate that we got the materials quality we required.Research report documenting work performed and findings.Proposal Requirements:Proposals will be considered non-responsive and will not be accepted for technical evaluation if they are not received by the deadline or do not meet the requirements stated in RTI’s University Handbook.Proposals should be submitted in PDF format, 1 PDF file per proposal. File name should include project name and university abbreviation.Pre-Proposal Meeting Information:Friday, September 11, 2015 9:00 – 12:00Austin Riverside Campus118 E. Riverside Dr.ENV Conference Room, 1st Floor, 1B1AWebex Information:Join the online meeting:Go to: Join WebEx meeting Meeting number: 737 294 354 Meeting password:1234Teleconference information;Provide your phone number when you join the meeting to receive a call back. Alternatively, you can call: Call-in toll-free number: 1-866-6371408?(US) Conference Code: 199 125 9183Proposal Deadline:Proposals are due to RTI by 4:00 p.m. Central Time, October 12, 2015. Email submissions should be sent to rtimain@. ................
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