Construction And Materials

Independent assurance program (IAP)

  • Double checks to make sure the testers and test equipment are working correctly. This includes contractor, state, county, city, and consultant staff and test equipment.
  • IAP is done by district and central laboratory personnel.
  • IAP double checks the testing of:
    • Hot-mix asphalt mix, pavement, and ride quality.
    • Portland cement concrete mix, pavement, and ride quality.
    • Aggregates.
    • Soils.
    • Binder sampling.
The IAP is a part of the Iowa DOT's Quality Assurance Program for Construction. Iowa DOT's IM 207 and Appendix A explain the program components and responsibilities. Another good source for more information is the FHWA Tech Brief.