Laboratory Services - Northwest Geotech
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Laboratory Services
NTI's in-house laboratory has been inspected and approved by the Oregon Building Officials Association (OBOA), the City of Portland Bureau of Development Services (COP-BDS), the American Association for Laboratory Accreditation (A2LA Scope of Accreditation), the Washington Association of Building Officials (WABO), the Oregon Department of Transportation (ODOT), and the U.S. Army Corps of Engineers (USACE). NTI operates under and is certified to meet ASTM E329, “Standard Specification for Agencies Engaged in the Testing and/or Inspection of Materials Used in Construction” and the International Standards ISO/IEC 17020 “General Criteria for the Operation of Various Types of Bodies Performing Inspection”, ISO/IEC 17025 “General Requirements for the Competence of Testing and Calibration Laboratories” and ISO/IEC 9000 “Quality System Management.” For a printable list of our Laboratory Sevices click here
Atterberg Limits ASTM D4318; AASHTO T89/T90
- Constant Head Permeability of Granular Soil ASTM D2434
- Consolidation ASTM D2435; AASHTO T216
- Collapse Potential of Soils ASTM D5333
- Direct Shear (3 points) ASTM D3080; AASHTO T236
- Residual Direct Shear
- Expansion Index UBC 29-2 ASTM D4829; AASHTO T258
- Flexible Wall Permeability ASTM D5084
- Moisture Content ASTM D2216; AASHTO T265
- Moisture Content and Dry Density
- Moisture Density Relationship - Modified ASTM D1557; AASHTO T180
- Moisture Density Relationship - Standard ASTM D698; AASHTO T99
- No. 200
- Organic Content ASTM D2974; AASHTO T267
- Particle Size Analysis of Soil (Hydrometer) ASTM D422
- pH CalTrans 643; AASHTO T289
- Resistance R-Value ASTM D2844; AASHTO T190
- Resistivity – Minimun CalTrans 643; AASHTO T288
- Specific Gravity of Soil ASTM D854; AASHTO T100
- Swell or Settlement (One-Dimensional)
Potential of Cohesive Soils ASTM D4546
- Triaxial Compression Test AASHTO T296
Unconsolidated-Undrained ASTM D2850
Consolidated Undrained D4767
- Unconfined Compression of Soil ASTM D2166; AASHTO T208
- Unconfined Compression of Rock Cores ASTM D4543/D7012 Method C
ASPHALTIC CONCRETE TESTING
Asphaltic Concrete Mix Design
- Core Density and Thickness ASTM D2726/D1188
- Theoretical Maximum Specific Gravity ASTM D2041; AASHTO T209
- Oil Content/Gradation Ignition ASTM D6307; AASHTO T308
- Oil Content Calibration Ignition ASTM D6307;
ODOT TM323 (Per Each Temperature)
- Softening Point of Bitumen (Ring-and-Ball) ASTM D36
- Asphaltic Concrete Mix Design Superpave Verification Set
(VMA, VFA, Bulk Density) AASHTO T312
CONCRETE AND MASONRY TESTING
- Concrete or Grout Mix Design
- Compression Test, 4” x 8” or 6” x 12” Cylinder ASTM C39; AASHTO T22
- Compression Test, Core ASTM C42; AASHTO T24
- Compression Test, Grout Prism ASTM C1019; UBC 21-18
- Compression Test, Mortar Cube or 2” x 4” Cylinder ASTM C109/C780;
UBC 21-15 or 21-16; AASHTO T106
- Compressive Strength of Masonry Block ASTM C90; UBC 21-4
- Compressive Strength of Masonry Prism – Grouted or Ungrouted
ASTMC1314; UBC 21-17
- Density, Absorption, and Voids in Hardened Concrete
ASTM C642
- Flexural Test, 6” x 6” x 22” ASTM C78; AASHTO T97
- Moisture Content, Unit Weight, Percent Net Area & Absorption
of Masonry Block ASTM C140
- Split Tensile Testing of Concrete ASTM C496
- Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)
ASTM C1260/C1567
AGGREGATE TESTING
Accelerated Expansion US
- Clay Lumps & Friable Particles ASTM C142; AASHTO T112
- Elongated Materials ODOT TM229; ASTM D4791
- Fractured Faces ASTM D5821
- Lightweight Pieces ASTM C123; AASHTO T113 (2.0 & 2.4 Specific Gravity)
- Moisture Density Relationship - Modified ASTM D1557; AASHTO T180
- Moisture Density Relationship - Standard ASTM D698; AASHTO T99
- No. 200
- Organic Impurities ASTM C40
- Sand Equivalent ASTM D2419; AASHTO T176
- Sieve Analysis ASTM C136; AASHTO T27
- Sieve Analysis Combined with No. 200
ASTM C136/C117; AASHTO T27/T11
- Soundness - Magnesium or Sodium, 5 cycles ASTM C88; AASHTO T104
- Specific Gravity and Absorption Coarse Aggregate
ASTM C127; AASHTO T85
- Specific Gravity and Absorption Fine Aggregate
ASTM C128; AASHTO T84
- Uncompacted Void Content of Fine Aggregate ASTM C1252; AASHTO T304
- Unit Weight and Voids in Aggregate ASTM C29; AASHTO T19
- Wood Particles; ODOT TM225
