Laboratory Testing Services

7NT labs offer a wide variety of physical and chemical analyses for soil, rock, and other construction materials. Our lab works closely with our engineers to ensure we perform the most effective array of tests, that yield the most appropriate results for the job at hand. We always strive for the highest quality data and results by adhering to many widely accepted testing procedures, such as ASTM test methods. 7NT’s labs are accredited by: AASHTO. For a detailed list of our accredited scopes for each location, please visit https://aashtoresource.org/aap/accreditation-directory

Laboratory Services:

Soil

  • Moisture-Density Relationships (Proctor)
  • USCS Engineering Classification
  • Porosity, Void Ratio
  • Soil Resistivity
  • Permeability
  • Triaxial Compression Testing (UU,CUPP)
  • Swell Potential
  • Consolidation
  • Unconfined Compressive Strength
  • California Bearing Ratio (CBR)
  • Atterberg Limits
  • Moisture Content
  • Particle Size Analysis
  • Oragnic Content (LoI)
  • Specific Gravity
  • Unit Weight and Density
  • pH Testing

Rock 

  • Rock Core Logging
  • Drilled Rock Core Strength
  • Direct Shear
  • Mosture Content
  • Unconfied Compression
  • Moduli in Uniaxial Compression
  • Bulk Density
  • Splitting Tensile Strength
  • Punch Penetration
  • Slake Durability
  • Cerchar Abrasivity
  • Petrographic Anaylsis
  • Direct Shear Strength
  • Moh’s Hardness
  • Point Load Strength

Aggregate

  • Gradation
  • LA Abrasion
  • Organic Impurities
  • DOT Parameters
  • MOH’s Hardness
  • Specific Gravity
  • Clay Lmps
  • Soundness (Sodium Sulfate or Magnesium Sulfate)
  • Crush Count
  • Acid Solubility/Insoluble Resdue
  • Moisture Density Relationships (Proctor)
  • Lightweight Particles
  • ASTM C33 Quality Analysis
  • Freeze Thaw
  • Porosity
  • Sand Equivalency

Masonry

  • Compressive Strength Testing
  • Unit Weight and Absopotion Determinations
  • Grout and Mortar Testing

Concrete

  • Compressive Strength
  • Drilled Concrete Core Strength
  • Block Testing
  • Prisms
  • Point & 3rd Point (Beams)
  • Flexural Strength Center Voids and Absorption

Asphalt

  • Thickness
  • QA/QC Testing at Bituminous Mix Plants

Featured Projects

Ohio River Tunnel2022-02-07T02:23:17+00:00
Ohio River Tunnel
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Ohio River Tunnel

Allegheny Tunnel2022-02-07T02:34:22+00:00
Allegheny Tunnel
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Allegheny Tunnel

“Over the years, 7NT has provided extensive geotechnical drilling and engineering services consisting of hundreds of exploratory borings. 7NT’s engineering and drilling staff regularly accommodate very tight time frames required due to the magnitude of these projects. 7NT’s qualifications are outstanding”

Spencer Fairfax, P.G. • Black & Veatch Corporation

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