Materials laboratory testing & field inspection

Materials and Fabrication Inspection staff test and approve a variety of materials for use in construction projects.

Materials and fabrication inspection

Materials and Fabrication Inspection staff test and approve a variety of materials for use in construction projects. Often, these materials have protective coatings such as liquid coating, powder coating, thermal spray zinc coating, hot dip galvanized zinc coating, or anodizing. We also:

  • Complete visual inspections of materials to assure compliance to contract provisions
  • Ensure that tape measures, digital calipers, survey equipment and other construction-related equipment provide accurate measurements
  • Collect samples of reinforcing bar, paint, bolting material, etc. for testing
  • Witness testing of concrete at the fabricator's facility
  • Review material certifications and documentation as required by contract.

Chemical Materials Testing

At the Chemistry Laboratory, we conduct a variety of tests on the following roadway construction materials to determine conformance with WSDOT Standard Specifications:

  • Cement (chemical analysis)
  • Joint materials
  • Paints
  • Fencing
  • Epoxies
  • Bearing pad material
  • Pigmented sealers

Katharine Dafoe
Chemical Materials Supervisor
360-709-5537

Bituminous Materials Testing

The Bituminous Materials Section staff perform a variety of tests on the following roadway construction materials to determine conformance to WSDOT Standard Specifications:

  • Hot Mix Asphalt (HMA) mix design
  • Warm Mix Asphalt (WMA) mix design
  • Mix design conformation testing
  • Performance Graded (PG) binder testing
  • Emulsified asphalt testing

The Bituminous Materials Section also provides forensic testing on asphalt binders and mixtures, new bituminous technology evaluation, nuclear density gauge service and calibration, and special project assistance.

Steve Davis
Bituminous Materials Engineer
360-709-5424

8,683 animals crossed the Snoqualmie Pass East Project area

as recorded by WSDOT and partners in 2020 and 2021.

46% increase in Amtrak Cascades ridership to 251,000 passengers

in 2021 compared to 172,000 in 2020.

Nine wetland and stream mitigation sites across 32.7 acres added

to our monitoring program in 2021 to help offset climate change impacts.