Grubbs, Hoskyn, Barton & Wyatt, Inc. laboratory operations use state-of-the-art equipment and methods for performing routine and specialized tests on soil and rock. Testing capabilities include: water content, specific gravity, density, Atterberg Limits, grain-size from sieve analyses and hydrometer, permeability using constant-head and falling-head and flexible-wall apparatus, shrinkage tests, maximum and minimum density tests, pin-hole dispersion, resistivity, pH and chemical analyses, triaxial shear and direct shear tests, consolidation tests and Standard and Modified Proctor moisture-density tests.
Our Little Rock laboratory facility is periodically inspected by AASHTO, the US Army Corps of Engineers, Center for Training Transportation Professionals (CCTP), and CCRL. Laboratory certification information is attached.