Laboratory Services - Northwest Geotech

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Laboratory Services

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

SOIL TESTING

Atterberg Limits ASTM D4318; AASHTO T89/T90

California Bearing Ratio (CBR) ASTM D1883; AASHTO T193
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 Wash ASTM D1140
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 ACOE CRD-C148

Clay Lumps & Friable Particles ASTM C142; AASHTO T112
Elongated Materials ODOT TM229; ASTM D4791
Fractured Faces ASTM D5821
L.A. Abrasion ASTM C131/C535; AASHTO T96
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 Wash ASTM C117; AASHTO T11
Oregon Air Degradation; ODOT TM208
Organic Impurities ASTM C40
Sand Equivalent ASTM D2419; AASHTO T176
Sieve Analysis ASTM C136; AASHTO T27
Sieve Analysis Combined with No. 200 Wash

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