Our highly trained geotechnical team prepares soils investigations for the planning phase of the project and then conducts all of the materials testing during the construction phase. Our team provides clients with a total geotechnical package.

The NEI Geotechnical lab is certified by the Arizona Department of Transportation, U.S. Army Corps of Engineers, and is accredited by the American Association of State Highway and Transportation Officials (AASHTO).

Our lab has met the minimum requirements in AASHTO R 18 set forth by the AASHTO Highway Subcommittee on Materials for the testing of:

Hot Mix Asphalt: AASHTO T30, T166, T209, T245, T269, T308 and ASTM D2041, D2726, D3203, D3666, D5444, D6307, D6926

Aggregate: AASHTO T11, T21, T27, T84, T85, T96, T176, T248, T255 and ASTM C40, C117, C127, C128, C131, C136, C566, C702, D2419

Soil: AASHTO T87, T89, T90, T99, T176, T180, T265 and ASTM D421, D698, D1557, D2216, D2419, D3740, D4318

Portland Cement Concrete: AASHTO T22, T23 (Cylinders), T119, T121, T141, T152, and ASTM (3) (Cylinders), C39, C138, C143, C172, C231, C1064, C1077, C1231

SOILS INVESTIGATIONS

NEI Geotechnical conducts soils investigations at sites proposed for development using a truck mounted drill rig CME 45B 4.25" hollow stem 8" auger, 4" split tube sampler, and 2" split tube sampler. Our geotechnical team collects soil samples and performs the Standard Penetration Test (SPT) at varying depths to determine the underlying soil conditions. Our certified laboratory technicians analyze the soil samples following the ASTM standards for mechanical gradation, moisture content and plasticity index. Our engineering staff utilizes this information to make recommendations on earthwork preparation and foundation design.

MATERIALS TESTING

NEI Geotechnical is also certified to conduct a wide variety of materials testing including subgrade compaction, concrete testing and asphalt testing.