Located in Dulles, Virginia, our laboratory is accredited by the Washington Area Council of Engineering Laboratories (WACEL) and the U.S. Army Corps of Engineers (USACE). The laboratory is inspected by the AASHTO Materials Reference Laboratory (AMRL) and the Cement and Concrete Reference Laboratory (CCRL).  GC&T verifies the results through a rigorous Quality Assurance Program.

We train and certify our lab technician personnel in their respective field of operation and applicable test methods.

Our Laboratory Manager and a Project Manager reviews and approves all of our test results prior to acceptance.  We maintain independent calibration records for the required instrumentation in accordance with the National Institute of Standards and Technology.  In accordance with AASHTO, ACI, ASTM, EPA, DDOT, MDOT and VDOT standards, we perform specific test procedures.

Our laboratory has acquired extensive experience in soils and concrete testing:

Soils – The soil testing process starts with a careful sampling of the materials to be tested. In order to determine the suitability of the soils, our laboratory performs tests such as:

• Moisture-Density relationship
• Atterberg limits
• Sieve analysis
• Soil classification
• CBR tests
• Hydrometer testing
• Peak strength direct shear test
• Residual direct shear test
• Expansion index test
• Organic content test
• pH test
• Moisture content test

Concrete - Our concrete services include complete inspection of concrete batching plants, trucks, and curing procedures. We verify compliance by utilizing procedures and specifications recommended by American Concrete Institute (ACI) and American Society for Testing and Materials (ASTM).  Our field and laboratory services include: