The American Association of State Highway and Transportation Officials (AASHTO) established the AASHTO Accreditation Program (AAP) in 1998. The objective of AAP is to provide a mechanism for formally recognizing the competency of testing laboratories to perform specific tests. The AAP utilizes both laboratory assessment and proficiency sample services provided by the AASHTO Materials Reference Laboratory (AMRL).

The following links will direct you to the AASHTO materials reference laboratory website that details our accreditation information.

Pittsburgh, Pennsylvania

Raleigh, North Carolina

Geotechnics has participated in the AMRL laboratory assessment and proficiency sample programs for soil and aggregates every year since 1996. The following is a list of AASHTO practices and test methods for which Geotechnics has been accredited.

• R18 Establishing and Implementing a Quality System for Construction Materials Testing Laboratories
  

• T88 Particle Analysis of Soils
  
• T89 Determining the Liquid Limit of Soils
  
• T90 Determining the Plastic Limit and Plasticity Index of Soils
  
• T99 Moisture Density Relations of Soils - 2.54-kg (5 lb.) Rammer, 305-mm (12 in.) Drop
  
• T100 Specific Gravity of Soils
  
• T180 Moisture Density Relations of Soils - 4.5-kg (10 lb.) Rammer, 457-mm (18 in.) Drop
  
• T193 The California Bearing Ratio
  
• T208 Unconfined Compressive Strength of Cohesive Soil
  
• T215 Permeability of Granular Soils ( Constant Head )
  
• T216 One-Dimensional Consolidation Properties of Soils
  
• T236 Direct Shear Test of Soils under Consolidated Drained Conditions
  
• T265 Laboratory Determination of Moisture Content of Soils
  
• T296 Unconsolidated, Undrained Compressive Strength of Soils in Triaxial Compression
  
• T297 Consolidated, Undrained Compression Test on Cohesive Soils
  

Aggregate Test Methods

T27 Sieve Analysis of Fine and Coarse Aggregates

T85 Specific Gravity and Absorption of Coarse Aggregate