Materials Testing


NTI maintains the only full-time materials testing laboratory on the North Olympic Peninsula.  Soil compaction, sieve analysis, concrete compressive strength, and other construction related quality control and performance tests are available.

Concrete, Grout & Masonry Testing

    • Compressive Strenth Testing
    • Mix Design and Placement
    • Slump Test of Concrete
    • Air Entrainment Content by Pressure
    • Weight & Volume

Soils & Aggregates

    • Moisture Density Relationship (Proctor) - ASTM D1557/D698 , AASHTO T99/T180
    • Classification of Soils using USCS - ASTM D2487
    • Liquid Limits, Plastic Limits and Plasticity Index - ASTM D4318
    • Wet and Dry Gradation Sieve Analysis - ASTM C117/C136 , AASHTO T27/T90
    • Sand Equivalency Value - ASTM D2419, AASHTO T176
    • Fractured Particle Determination - ASTM D5821
    • Specific Gravity and Absorption of Soils - ASTM C127
    • Soundness of Aggregate using Sodium Sulfate - C88
    • pH Value of Soils - ASTM D4972
    • Organic Matter by Ignition - ASTM D2974
    • Hydrometer- Grain Size Distribution Analysis ASTM D-422
    • D10/D30/D60 Determination
    • Degradation - T113

Special Inspection

  • Structural Steel/ Rebar Inspection
  • High Strength Bolting
  • Compaction Testing using Nuclear Densometer
  • Welding Inspection
  • Epoxy Dowel Installation Inspection
  • Detention Basin Monitoring
  • QA/ QC Construction Monitoring and Inspection
Materials Testing