Drilling
Ohio River Tunnel
Louisville, Kentucky
Geotechnical drilling and laboratory services for a 33.7-million-gallon deep tunnel and pump station system.
View ProjectLaboratory Testing Services
Soil, rock, aggregate, masonry, concrete, and asphalt laboratory testing aligned with widely accepted ASTM and AASHTO procedures.
Capability overview
Laboratory Testing
7NT laboratories perform physical and chemical analyses for soil, rock, aggregate, masonry, concrete, asphalt, and other construction materials. The labs work closely with engineers to choose the most effective array of tests for the job at hand and produce high-quality data using widely accepted procedures including ASTM methods.
View the AASHTO accreditation directory
7NT states that its labs are AASHTO accredited and directs visitors to the AASHTO accreditation directory for detailed location-specific scopes.
What this includes
Capabilities
- Soil classification, Atterberg limits, moisture, density, permeability, CBR, consolidation, and triaxial testing
- Rock core logging, compressive strength, point load, slake durability, Cerchar abrasivity, and petrographic analysis
- Aggregate gradation, LA abrasion, soundness, clay lumps, crush count, and quality analysis
- Concrete compression, drilled core strength, beams, prisms, voids, and absorption
- Masonry, grout, mortar, asphalt thickness, and bituminous plant QA/QC testing
- AASHTO accreditation directory reference for location-specific scopes
Soil
- Moisture-density relationships (Proctor)
- USCS engineering classification
- Porosity and 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
- Organic content (LoI)
- Specific gravity
- Unit weight and density
- pH testing
Rock
- Rock core logging
- Drilled rock core strength
- Direct shear
- Moisture content
- Unconfined compression
- Moduli in uniaxial compression
- Bulk density
- Splitting tensile strength
- Punch penetration
- Slake durability
- Cerchar abrasivity
- Petrographic analysis
- Direct shear strength
- Moh's hardness
- Point load strength
Aggregate
- Gradation
- LA abrasion
- Organic impurities
- DOT parameters
- Moh's hardness
- Specific gravity
- Clay lumps
- Soundness (sodium sulfate or magnesium sulfate)
- Crush count
- Acid solubility / insoluble residue
- Moisture-density relationships (Proctor)
- Lightweight particles
- ASTM C33 quality analysis
- Freeze thaw
- Porosity
- Sand equivalency
Masonry
- Compressive strength testing
- Unit weight and absorption determinations
- Grout and mortar testing
Concrete
- Compressive strength
- Drilled concrete core strength
- Block testing
- Prisms
- Point and third-point beams
- Flexural strength
- Center voids and absorption
Asphalt
- Thickness
- QA/QC testing at bituminous mix plants
How 7NT works
Service process
- Review the engineering question and select the test methods best suited to the material and project stage.
- Coordinate samples from field teams, owners, contractors, or related engineering programs.
- Perform physical and chemical analysis using widely accepted ASTM and AASHTO procedures.
- Provide data that can support engineering interpretation, quality decisions, and construction documentation.
Connected work
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Allegheny Tunnel
Somerset County, Pennsylvania
Drilling and instrumentation in active landslide conditions near the Pennsylvania Turnpike's Allegheny Tunnel.
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