Our clients count on our multi-disciplined staff and modern equipment to provide expert testing and quality control. Whether preparing a site, evaluating an existing structure or facility, or requiring ongoing testing, Navarro & Wright has the equipment, facilities and expertise you need. We provide top-quality sampling, testing and analysis to help you meet project requirements and provide recommendations for types of testing to accurately suit the specific requirements of your projects.
N&W operates two AASHTO–accredited (American Association of State Highway and Transportation Officials) materials testing and concrete testing laboratories.
Our AASHTO-accredited laboratories located in Harrisburg and Camp Hill, Pennsylvania provide numerous soils, compaction, strength, consolidation and chemical testing in accordance with applicable AASHTO standards.
The AASHTO Accreditation Program (AAP) is the largest accrediting body of construction materials testing laboratories and formally recognizes the competence of testing laboratories to perform specific tests on construction materials. AAP is a voluntary program that is available to all testing laboratories including government, commercial, university, and research facilities.
Soils testing laboratory services include :
Soil Tests
- AASHTO R58 – Dry Preparation of Disturbed Soil and Soil Aggregate Samples for Test
- AASHTO T88 – Particle Size Analysis of Soils
- AASHTO T89 – Determining the Liquid Limit of Soils
- AASHTO T90 – Determining the Plastic Limit and Plasticity Index of Soils
- AASHTO T99 – Moisture-Density Relations of Soils Using a 2.5-kg (5.5-lb) Rammer and a 305-mm (12-in.) Drop
- AASHTO T100 – Specific Gravity of Soils
- AASHTO T180 – Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop
- AASHTO T193 / ASTM D1883 – The California Bearing Ratio
- AASHTO T208 / ASTM D2166 – Unconfined Compressive Strength of Cohesive Soil
- AASHTO T216 / ASTM D4546 – One-Dimensional Consolidation Properties of Soils
- AASHTO T236 / ASTM D3080 – Direct Shear Test of Soils Under Consolidated Drained Conditions
- AASHTO T265 – Laboratory Determination of Moisture Content of Soils
- AASHTO T267 / ASTM D2974 – Determination of Organic Content in Soils by Loss on Ignition
- AASHTO T288 – Minimum Soil Resistivity
- AASHTO T289 / ASTM D4972 – pH of Soils for Corrosion Testing
- AASHTO T290 – Determining Water-Soluble Sulfate Ion Content in Soil
- AASHTO T291 – Determining Water-Soluble Chloride Ion Content in Soil
- AASHTO T296 / ASTM D2850 – Unconsolidated, Undrained Compressive Strength of Cohesive Soils in Triaxial Compression
- AASHTO T297 / ASTM D4767 – Consolidated, Undrained Triaxial Compression Test on Cohesive Soils
- ASTM D421 – Dry Preparation of Soil Samples for Particle-Size Analysis and Determination of Soil ConstantsASTM D421
Dry Preparation of Soil Samples for Particle-Size Analysis and Determination of Soil Constants - ASTM D422 – Particle-Size Analysis of Soils
- ASTM D698 – Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3 (600 kN-m/m3))
- ASTM D854 – Specific Gravity of Soil Solids by Water Pycnometer
- ASTM D1557 – Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3(2,700 kN-m/m3))
- ASTM D2216 – Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
- ASTM D2435 – One-Dimensional Consolidation Properties of Soils Using Incremental Loading
- ASTM D2487 – Soils for Engineering Purposes (Unified Soil Classification System
- ASTM D2488 – Description and Identification of Soils (Visual-Manual Procedure)
- ASTM D4318 – Liquid Limit, Plastic Limit, and Plasticity Index of Soils
- ASTM D5084 – Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter
- ASTM G187 – Soil Resistivity Using a Two-Electrode Soil Box Method
- ASTM D7928 – Particle-Size Distribution (Gradation) of Fine- Grain Soils Using a Flexible Wall Permeameter
- ASTM D1140 – Amount of Material in Soils Finer that the No. 200 (75-µm) Sieve
Rock Tests
- ASTM D4543 – Preparing Rock Core as Cylindrical Test Specimens and Verifying Conformance to Dimensional and Shape Tolerances
- ASTM D7012 – Compressive Strength of Rock Core Specimens (Method C)
- ASTM D3967 – Splitting Tensile Strength of Intact Rock Core Specimens
- ASTM D4644 – Slake Durability of Shales and Weak Rocks
- ASTM D5731 – Point load Strength Index of Rock
Compaction Tests
- ASTM D698 and AASHTO T99 – Standard Compaction
- ASTM E1557 and AASHTO T180 – Modified Compaction
Strength Tests
- ASTM D3080 and AASHTO T236 – Direct Shear
- ASTM D2850 and AASHTO T296 – Triaxial Shear
- ASTM D4767 and AASHTO T297 – Triaxial Shear w/Pore Pressure Measurements
- ASTM D2166 & AASHTO T208 – Unconfined Compressive Strength of Cohesive Soil
- ASTM D7012 (method C) – Unconfined Compressive Strength of Rock Core
- Unconfined Compressive Strength of 6” dia. Concrete Cylinders – in accordance with ASTM C39
- ASTM 1883 and AASHTO T193 – California Bearing Ratio
Consolidation Testing
- ASTM D2435 and AASHTO T21 – One-Dimensional Consolidation of Soil
Chemical Tests (Soils)
- ASTM 4972 and AASHTO T289 – pH of Soils
- ASTM G187 and AASHTO T288 – Minimum Resistivity
- AASHTO T291, CalDOT 417 – Sulfate Content
- AASHTO T290, CalDOT 422 – Chloride Content
Chemical Tests (Water)
- ASTM D1293 – pH
- ASTM D1125 – Resitivity /Conductivity
- ASTM D1125 – Sulfate Content
- ASTM D512 – Chloride Content
Concrete Laboratory Services Include:
- ASTM C31 / C31M / AASHTO T23 – Standard Practice for Making and Curing Concrete Test Specimens in the Field
- ASTM C39 / C39M / AASHTO T22 – Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens
- ASTM C78 / C78M / AASHTO T97 – Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
- ASTM C138 / C138M / AASHTO 121 – Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete
- ASTM C143 / C143M / AASHTO T119– Standard Test Method for Slump of Hydraulic-Cement Concrete
- ASTM C172 / C172M / AASHTO R60 – Standard Practice for Sampling Freshly Mixed Concrete
- ASTM C173 / C173M / AASHTO T196– Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
- ASTM C231 / C231M / AASHTO T152– Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method
- ASTM C293 / C293M / AASHTO T177– Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Center-Point Loading)
- ASTM C511 / M201 – Standard Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes
- ASTM C617 / C617M / AASHTO T231– Standard Practice for Capping Cylindrical Concrete Specimens (8000 PSI and below)
- ASTM C1064 / C1064M / AASHTO T309 – Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
- ASTM C1231 / C1231M – Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Cylindrical Concrete Specimens (7000 PSI and below)
- ASTM C1019 – Standard Test Method for Sampling and Testing Grout for Masonry