Chapter 1: Introduction


Section 1: Overview

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The Texas Department of Transportation (TxDOT) established the Quality Assurance Program (QAP) to ensure that materials and workmanship incorporated into any highway construction project are in reasonable conformity with the requirements of the approved plans and specifications, including any approved changes. This program conforms to the criteria in 23 CFR 637(b). It consists of an "Acceptance Program" and "Independent Assurance (IA) Program" based on test results obtained by qualified persons and equipment.

The QAP allows for the use of validated contractor-performed quality control (QC) test results as part of an acceptance decision. It also allows for the use of test results obtained by commercial laboratories in the IA program, as well as in acceptance decisions. The acceptance of all materials and workmanship shall be the responsibility of the engineer.

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The following terms and definitions are referenced in this manual:

  • Abuse. Abuse is defined as the intentional deviations from approved procedures.
  • Acceptance Program. An Acceptance Program is defined as all factors that comprise the State highway agency’s (SHA) determination of the quality of the product as specified in the contract requirements. These factors include verification sampling, testing, and inspection and may include results of quality control sampling and testing.
  • Independent Assurance Program. An Independent Assurance Program is defined as activities that are an unbiased and independent evaluation of all the sampling and testing procedures used in the acceptance program. Test procedures used in the acceptance program, which are performed in the SHA's central laboratory, would not be covered by an independent assurance program.
  • Neglect. Neglect is defined as unintentional deviations from approved procedures that may or may not cause erroneous results.
  • Proficiency samples. Proficiency samples are defined as homogenous samples that are distributed and tested by two or more laboratories and/or personnel. The test results are compared to assure that the laboratories and/or personnel are obtaining the same results.
  • Qualified laboratories. Qualified laboratories are laboratories that are capable as defined by appropriate programs established by the SHA. As a minimum, the qualification program shall include provisions for checking testing equipment and the laboratory shall keep records of calibration checks.
  • Qualified sampling and testing personnel. Qualified sampling and testing personnel are personnel who are capable as defined by appropriate programs established by the SHA.
  • Quality assurance. Qualified assurance is defined as all those planned and systematic actions necessary to provide confidence that a product or service will satisfy given requirements for quality.
  • Quality control. Quality control is defined as all contractor/vendor operational techniques and activities that are performed or conducted to fulfill the contract requirements.
  • Vendor. Vendor is defined as a supplier of project-produced material that is not the contractor.
  • Verification sampling and testing. Verification sampling and testing is defined as sampling and testing performed to validate the quality of the product.
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For more information regarding the information and procedures in the manual, contact the Materials & Pavements Section of the Construction Division (512-506-5803).

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