GTA maintains soils and concrete laboratories in most of their facilities. Laboratory testing is performed in accordance with the latest AASHTO and ASTM standard methods. Our facilities have been accredited by AASHTO Materials Reference Laboratory (AMRL), Cement and Concrete Reference Laboratory (CCRL), U.S. Army Corps of Engineers (USACE), and the Washington Council of Engineering Laboratories (WACEL).

GTA's areas of specialization are as follows:

Soil Testing

• Unconfined compression
• Gradation analyses
• Atterberg limits
• Natural moisture contents
• Specific gravity
• Moisture-density
• California Bearing Ratio
• Consolidation
• Direct shear
• Triaxial compression
• Classification
• Organic content
• LA abrasion

Concrete Testing

• Field QA/QC
• Cores
• Mix design
• Compressive strength
• Entrained air
• Unit weight
• Flexural testing of molded beams
• Mortar/grout cubes
• Floor Flatness/Levelness