Materials Testing

Our in-house laboratory has been inspected and approved by the International Council of Building Officials (ICBO), the International Accreditation Service (IAS), the Oregon Building Officials Association (OBOA), the Washington Association of Building Officials (WABO), the City of Portland Bureau of Development Services (COP-BDS), 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.”

List of Laboratory Tests

Soil and Aggregate Testing Atterberg Limits - ASTM D4318, AASHTO T89/T90 California Bearing Ratio (CBR) - ASTM D1883, AASHTO T193 Classification of Soils - ASTM D2487 Clay Lumps & Friable Particles - ASTM C142, AASHTO T112 Correction of Unit Weight and Water Content of Soils - ASTM D4718 Consolidation of Solils - ASTM D2435, AASHTO T216 Direct Shear - ASTM D3080, AASHTO T236 Elongated Materials - ASTM D4791 Flexible Wall Permeability - ASTM D5084, Fractured Faces - D5821 Hydrometer Analysis - ASTM D422, AASHTO T88 LA Abrasion - ASTM C131/C535, AASHTO T96 Lightweight Pieces - ASTM C123, AASHTO T113 Moisture Content - ASTM D2216, AASHTO T265 Moisture Density Relationship (Modified) - ASTM D1557, AASHTO T180 Moisture Density Relationship (Standard) - ASTM D698, AASHTO T99 No. 200 Wash - ASTM C117/D1140, AASHTO T11 Organic Content - ASTM D2974, AASHTO T267 Organic Impurities - ASTM C40 pH of Soils - AASHTO T289, CALTRANS 643 Resisitivity of Soils - AASHTO T288, CALTRANS 643 Sand Equivalent - ASTM D2419, AASHTO T176 Sieve Analysis - ASTM C136, AASHTO T27 Soundness of Aggregate (Magnesium or Sodium Sulfate) - ASTM C88, AASHTO T104 Specific Gravity and Absorption of Coarse Aggregate - ASTM C127, AASHTO T85 Specific Gravity and Absorption of Fine Aggregate - ASTM C128, AASHTO T84 Specific Gravity of Soil - ASTM D854, AASHTO T100	Unconfined Compression of Soil - ASTM D2166, AASHTO T208 Unit Weight and Voids in Aggregate - ASTM C29, AASHTO T19 Concrete and Masonry Testing Compressive Strength of Concrete Cylinders - ASTM C39, AASHTO T22 Compressive Strength of Cores - ASTM C42, AASHTO T24 Compressive Strength of Grout Prisms - ASTM C1019, UBC 21-18 Compressive Strength of Mortar Cubes or Cylinders - ASTM C109/C780, AASHTO T106, UBC 21-15/21-16 Compressive Strength of Masonry Block - ASTM C90, UBC 21-4 Compressive Strength of Masonry Prism - ASTM E 447/C1314, UBC 21-17 Flexural Test of Concrete - ASTM C78, AASHTO T97 Moisture Content, Unit Weight, Percent Net Area, and Absorption of Masonry Block - ASTM C140	Fireproofing Testing Thickness and Density of Sprayed Fire-Resistive Materials - ASTM E605, UBC 7.6, Technical Manual 12A Asphaltic Concrete Testing Bulk Specific Gravity on Compacted Bituminous Mixtures - ASTM D2726 Core Density and Thickness - ASTM D2726 Percent Air Voids in Compacted Dense and Open Bituminous Paving Mix - ASTM D3203, AASHTO T269 Oil Content Calibration for Ignition Method - ASTM D6307, AASHTO T308, ODOT TM 321 Theoretical Maximum Specific Gravity - ASTM D2041, AASHTO T209

Soil and Aggregate Testing