Testing Services

Specializing in aggregates, concrete & construction materials, County Materials’ Testing Laboratory offers comprehensive sampling, testing, and failure analysis for aggregates, concrete and related construction materials.

ASTM Testing Capabilities

All testing is performed in accordance with ASTM, AASHTO, ACI and D.O.T. guidelines or design specification requirements.
    • ASTM C29
      Test method for bulk density and voids in aggregate

    • ASTM C40
      Test method for organic impurities in fine aggregate

    • ASTM C87
      Test method for effect of organic impurities in fine aggregate on mortar

    • ASTM C88
      Test method for soundness of aggregate by sodium sulfate or magnesium

    • ASTM C117
      Materials finer by No. 200 sieve in aggregates by washing

    • ASTM C127/128
      Density and absorption of coarse/fine aggregate

    • ASTM C131
      Resistance to degradation of small size coarse aggregate by abrasion and impact in L.A. machine

    • ASTM C136
      Sieve analysis of fine and coarse aggregates

    • ASTM C142
      Clay lumps and friable particles in aggregates

    • ASTM C1252
      Uncompacted void content of fine aggregate
    • ASTM C31
      Curing concrete test specimens in field

    • ASTM C39
      Compressive strength of cylindrical concrete test specimens

    • ASTM C138
      Density, yield and air content of concrete

    • ASTM C143
      Slump of hydraulic cement concrete

    • ASTM C173
      Air content of freshly mixed concrete by volumetric method

    • ASTM C231
      Air content of freshly mixed concrete by pressure method

    • ASTM C403
      Time of setting of concrete mixtures by penetration resistance

    • ASTM C642
      Density, absorption and voids in hardened concrete

    • ASTM C672
      Scaling resistance of concrete surfaces exposed to deicing chemical

    • ASTM 1064
      Temperature of freshly mixed hydraulic- cement concrete

    • ASTM C1074
      Estimating strength at concrete by maturity method

    • ASTM C1231
      Compressive strength of hardened concrete cylinders

    • ASTM C1611
      Slump flow of SCC concrete

    • ASTM C1621
      Passing ability of SCC by J-Ring

    • ASTM C1688
      Density and void content of pervious concrete
    • ASTM C109
      Compressive strength of hydraulic cement mortars

    • ASTM C185
      Air content of hydraulic cement mortar

    • ASTM C187
      Normal consistency of hydraulic cement

    • ASTM C191
      Time of setting of hydraulic cement by Vicat needle

    • ASTM C266
      Time of setting of hydraulic cement paste by Gillmore needles

    • ASTM C430
      Fineness of hydraulic cement by No. 325 sieve

    • ASTM C1019
      Test methods for sampling and testing grout

    • ASTM C1437
      Flow of hydraulic cement mortar
    • ASTM C90
      Loadbearing concrete masonry units

    • ASTM C140
      Sampling and testing concrete masonry units

    • ASTM C936
      Solid concrete interlocking paving units

    • ASTM C1372
      Dry cast segmental retaining wall units

    • ASTM C1403
      Test method for rate of water absorption of masonry mortars
    • ASTM C1194
      Compressive strength of architectural cast stone

    • ASTM C1195
      Absorption of architectural cast stone

    • ASTM C1364
      Architectural cast stone


Our in-house testing lab has achieved accreditation or certification by several agencies:

• The American Association of State Highway and Transportation Officials (AASHTO) AMRL Proficiency Testing, the primary accreditation body for construction material testing in the United States.
• Cement and Concrete Reference Laboratory (CCRL), an agency committed to the improvement of quality testing in the construction materials industry through laboratory assessments, proficiency samples, instruction, guidance, and clarification of ASTM standards.

Our quality control group has over 50 years of combined experience and participates in a number of qualification programs:

• Wisconsin Department of Transportation
• Minnesota Department of Transportation
• Iowa Department of Transportation
• Illinois Department of Transportation
• NPCA-National Precast Concrete Association
• Precast/Prestress Concrete Institute (PCI)
• Wisconsin Ready Mix Concrete Association (WRMCA) for Concrete Field/Lab testing and Concrete Mix Design testing
• American Concrete Institute (ACI)

Scope of Service

Material Sampling, Testing & Analysis

• Particle Size Analysis
• Specific gravity
• Hydroscopic Moisture
• Angularity
• Hardness
• Unit Weight
• Absorption
Concrete (flat work, pipe and CMUs)
• Mix Design & Verification
• Compressive & Flexural Strength
• Concrete Core Samples & Testing

Cements and grouts
Masonry units

For more information:

Contact County Materials Today 800.242.7733

You are welcome to schedule a meeting with key project personnel and tour our laboratory. Should you have questions or wish to request aditional information, please contact Mike Strong or Chris Kirchner.