Our laboratory is certified by the American Association of State Highway and Transportation Officials (AASHTO) and complies with internationally recognized ASTM standards.

The AASHTO accreditation program recognizes the competency of a testing laboratory in construction materials testing by assessing both the equipment and the staff’s abilities. The accreditation process is often long and arduous, however, Geotechnical & Environmental Services, Inc. (GES) has proudly been AASHTO certified for the last 20 years.

GES’ AASHTO accredited lab provides the following lab testing:

Soil Testing

  • ASTM D421    Dry Preparation of Soil Samples
  • ASTM D422    Particle Size Analysis of Soil
  • ASTM D698    Laboratory Compaction of Soil Using a 5-lb. Rammer
  • ASTM D854    Specific Gravity of Soil
  • ASTM D1557  Laboratory Compaction of Soil Using a 10-lb. Rammer
  • ASTM D2216  Laboratory Moisture Content of Soil & Rock
  • ASTM D2217  Sampling for Test
  • ASTM D2435  One-Dimensional Consolidation Properties of Soil Laboratory Determination of 
                            Moisture Content of Soil.
  • ASTM 2487     Classification of Soils for Engineering Purposes
  • ASTM D3080   Direct Shear Test of Soils Under Consolidated Drained Conditions
  • ASTM D4318   Determining the Liquid Limit of Soil
  • ASTM D4318   Plastic Limit of Soil
  • ASTM D4643   Moisture Content of Soil by Microwave Oven Method
  • ASTM D4959   Moisture Content of Soil by Direct Heating Method
  • ASTM D5321   Determining the Coefficient of Soil by the Direct Shear
  • ASTM D5333   Standard Test Method for Measurement of Collapse Potential of Soils
  • ASTM D5607   Direct Shear Strength Tests of Rock Specimens
  • ASTM G57       Field (and Lab) Measurement of Soil Resistivity Using the Wennar Four-Electrode

Aggregate Testing

  • ASTM C29      Unit Weight of Aggregate
  • ASTM C40      Organic Impurities in Sands for Concrete
  • ASTM C88      Soundness of Aggregates by Use of Sodium Sulfate or   Magnesium Sulfate
  • ASTM C117    Amount of Material Finer 0.075-mm Sieve in   Aggregate
  • ASTM C127    Specific Gravity and Absorption of Coarse Aggregate
  • ASTM C128    Specific Gravity and Absorption of Fine Aggregate
  • ASTM C136    Sieve Analysis of Fine and Coarse Aggregate
  • ASTM C142    Clay Lumps and Friable Particles in Aggregate
  • ASTM C535    L.A. Abrasion Test
  • ASTM C566    Total Moisture Content of Aggregate by Drying
  • ASTM C702    Reducing Field Samples of Aggregate to Testing Size
  • ASTM C2419  Sand Equivalent Test
  • ASTM C2844  R-Value Test
  • ASTM D75      Standard Practice for Sampling Aggregates | Portland Cement Concrete Testing
  • ASTM C617    Capping Cylindrical Concrete Specimens
  • ASTM C1231  Use of Unbonded Caps for Concrete Cylinders


  • ASTM C109     Compressive Strength of Mortar
  • ASTM C780     Evaluation of Mortar for Plain & Reinforced Unit   Masonry
  • ASTM C942     Compressive Strength-Grouts-Preplaced Aggregate | Concrete
  • ASTM C1019   Sampling and Testing of Grout

Asphalt Testing

  • ASTM D1188  Bulk Specific Gravity of Compacted Bituminous Mixtures Using Paraffin-Coated
  • ASTM D1559  Resistance to Plastic Flow of Bituminous Mixtures Using Marshall Apparatus
  • ASTM D2041  Maximum Specific Gravity of Bituminous Paving Mixture
  • ASTM D2172  Quantitative Extraction of Bitumen from Bituminous Paving Mixtures
  • ASTM D2726  Specific Gravity of Compacted Bituminous Mixtures
  • ASTM D3203  Percent Air Voids in Paving Mixtures


  • ASTM C31    Making & Curing Concrete Test Specimens in the Field
  • ASTM C39    Compressive Strength Cylindrical Concrete Specimens
  • ASTM C42    Obtaining and Testing Drilled Cores of Concrete
  • ASTM C138  Unit Weight, Yield, and Air Content of Concrete
  • ASTM C143  Slump of Hydraulic Cement Concrete
  • ASTM C172  Sampling Freshly Mixed Concrete
  • ASTM C173  Air Content Freshly Mixed Concrete-Volumetric Method
  • ASTM C192  Making & Curing Concrete Test Specimens in the Lab
  • ASTM C495  Compressive Strength Lightweight Insulating Concrete