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From page 61...
... B-1   A P P E N D I X B Supplemental Guide Regarding Materials RBI
From page 62...
... B-2 Risk-Based Construction Inspection: A Guide Property-Based Optimization of Materials For materials that are to be accepted by sampling and testing, the optimization process presented in this appendix provides a systematic approach for further evaluating: • Properties and test methods that are more direct indicators of performance • The appropriate level of owner verification testing (if contractor test data is being used in the acceptance decision) Conceptual Framework The property-based assessment framework, as illustrated in Figure B-1, provides a structured decision process for prioritizing material sampling and testing activities based on the risk (i.e., likelihood and consequences)
From page 63...
... Supplemental Guide Regarding Materials RBI B-3   Framework Steps The framework shown in Figure B-1 includes a six-step process to determine the extent to which acceptance testing can be optimized or reduced based on performance risk. Step 1: Identify Materials of Interest The Level 2 optimization process applies to materials that are accepted on the basis of sampling and testing, a resource-intensive method that is primarily used for higher risk or more critical materials.
From page 64...
... B-4 Risk-Based Construction Inspection: A Guide • Does the property provide a measure of fundamental material characteristics (e.g., stiffness modulus, fatigue)
From page 65...
... Supplemental Guide Regarding Materials RBI B-5   Property Tier Description Suggested Level of QA Observational Property has an indirect relationship to performance and risk related to noncompliance is low QA methods entailing observational verification of contractor/producer tests combined with intermittent to random inspection, sampling, and testing of in-progress work Step 4: Assess benefit of using alternative or advanced acceptance properties Current sampling and testing protocols for material acceptance often rely on destructive testing of the inplace product. Although such testing generally provides more accurate and reliable results, it tends to be costly and time intensive.
From page 66...
... B-6 Risk-Based Construction Inspection: A Guide conformance with the specifications)
From page 67...
... Supplemental Guide Regarding Materials RBI B-7   a. Primary Properties.
From page 68...
... B-8 Risk-Based Construction Inspection: A Guide b. Secondary Property.
From page 69...
... Supplemental Guide Regarding Materials RBI B-9   observational approach, the DOT does not directly perform tests but instead observes the contractor's QC testing for equipment and procedural compliance with the test standard. Table B-4 provides an example of how a sampling and testing acceptance plan could be optimized based on material risk and property importance when the DOT uses contractor QC data for acceptance purposes.
From page 70...
... B-10 Risk-Based Construction Inspection: A Guide Box B.2: TxDOT Risk-Based Approach to Verification Testing Texas DOT (TxDOT) , in its Design Build Quality Assurance Program (QAP)

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