Testing of Materials

Sampling and testing of materials may be divided into the following categories:
  • Project Tests
    • Quality Assurance (QA)/Acceptance/Verification
    • Quality Control (QC)
  • Independent Assurance Program (IAP)
  • Quality Monitoring Program (QMP)
  • MPL
The following identifies actions and responsibility for the different types of tests:
  • Project Acceptance
     – Results Pass or Fail
    • Action – Material(s) is accepted by independent verification sampling and testing by TxDOT. Failing material is rejected and replaced, reworked and re-treated, accepted at the reduced unit price if specified in the contract and only if engineering judgement is documented in SM, accepted based on engineering judgement of reasonable conformance with the specification requirements.
    • Test Performance – Usually in the AE laboratory. In other cases, district laboratory, MTD central laboratory, or outside laboratory Material(s) is accepted by independent verification sampling and testing by TxDOT
  • MPL and QMP – Preapproved Material or Product/Source(s)
    • Action – Preapproved material sources must be sampled and tested in accordance with the required program interval.
    • Test Performance – MTD Central Lab or it's designee
  • IA Program – Meets tolerance or does not meet tolerance
    • Action – Compare the Independent Assurance test to acceptable tolerances established in Appendix B of the QAP for Design Bid Build Projects. Document results of the comparison. If the result is out of tolerance, determine the cause and take remedial action.