Quality, Service & Commitment


  • 22 Jan 2018

    Civil Engineer Needed

  • 08 Dec 2017

    INTERRA Honored With 2017 IRTBA Green Industry Achievement Award For Green Initiatives

  • 26 Oct 2017

    INTERRA To Host Ribbon Cutting With Bolingbrook Mayor Celebrating Going Green

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Laboratory Certifications

  • IL & WI State DOTs
  • ASTM


Firm Certifications

  • DBE with IDOT
  • MBE with City of Chicago

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You have skilled people, a superior laboratory facility with all the equipment in excellent condition and an outstanding QC/QA program. Your certified tranined staff was knowledgeable, courteous and proactive…

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Trusted Results.  INTERRA’s technology-driven materials testing laboratories are some of the most efficient in the country and are designed to deliver consistent results and documentation.  Additionally, as a company with no outside ownership interests and therefore, with completely independent laboratories, clients can confidently rely on their test results throughout the duration of their project.

Rapid Results.  Our state of the art facilities employ automatic equipment and data acquisition systems to minimize operator and data entry errors.  Our proprietary, in-house data management system and Quality Control procedures help ensure accurate results and expedited turn-arounds for faster, more confident decisions.  So…no matter if it’s five samples or five thousand, you can be confident that INTERRA’s reliable test results will be delivered when needed.

Accredited.  INTERRA’s materials testing laboratories have been accredited by a number of regulatory agencies including:  US Army Corps of Engineers, ASTM/AASHTO, and various state departments of transportation.

Partial listing of available test analyses:

Soils testing: Moisture content, unit weight, sieve analysis including hydrometer, Atterberg Limits, shrinkage, organic content by loss on ignition and wet combustion, percent fines, Proctor, CBR, IBR, permeability including flexwall, direct shear, consolidation, triaxial, unconfined compressive strength,  specific gravity, pH

Aggregate testing:  Sieve analysis, moisture content, unit weight and voids, organic impurities, slag count, surface moisture, soundness by sulfate, specific gravity and absorption, LA Abrasion, flat and elongated particles, abrasion by Micro-Deval, carbonate content, hydraulic conductivity

Portland Cement Concrete (PCC) and Masonry testing:  Compressive strength of cylinders, cubes and drilled cores, flexural strength of beams, thickness of drilled cores,  rebound or penetration resistance, maturity testing

Hot Mix Asphalt (HMA) testing: Sieve analysis, Moisture or volatile distillates, maximum specific gravity and density, bulk specific gravity, percent air voids, tensile strength ratio (TSR), asphalt content by ignition and extraction, density by Superpave gyratory, density by Marshall, stability and flow, density and thickness of pavement cores, rut resistance by Hamburg Wheel