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Specialty Materials Testing

Thermal Resistivity Testing

Calicore Engineering and Soil Tests Laboratory provide thermal resistivity testing services for soil, concrete, grout, and engineered backfill. Engineers and suppliers use the measured thermal rho values and dry-out curves for underground cable design and material submittals.

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Service overview

Thermal resistivity testing services for engineers and suppliers

Soil Tests Laboratory, the specialty materials-testing division of Calicore Engineering, performs thermal resistivity testing of soils, concrete, controlled backfill, grout, and related materials.

Programs may include as-received measurements, molded specimens, target-density or target-moisture testing, multi-point dry-out curves, and field sampling. Test conditions and sample preparation are documented so the resulting rho values can be applied correctly.

When the project needs the existing ground rather than only a shipped specimen, Calicore can visit the site for an in-situ thermal survey. Test locations are planned around the alignment and material changes, a thermal probe is installed in suitable soil or backfill, current conditions are documented, and selected bulk samples can be collected for laboratory dry-out testing during the same mobilization.

Looking for a thermal resistivity testing lab?

Send the project specification, material description, sample count, requested test conditions, and report deadline. We confirm whether the assignment needs a single thermal rho point, a measured dry-out curve, or field testing with supporting laboratory samples. Nationwide sample submission makes it possible to use a specialty thermal testing lab even when your project is outside California.

For ASTM D5334 testing services or an IEEE 442 testing request, include the required edition, units, moisture basis, target density where applicable, and any acceptance limit. Concrete and cementitious samples also need casting and curing information. These details connect the test report to the designer’s actual requirement.

Step by step

How the process works

The exact scope is matched to the project, but a typical assignment follows these steps.

  1. 01

    Confirm the design condition

    We review the material, governing specification, units, target density, target moisture, Proctor reference when applicable, and whether a single point or dry-out curve is needed.

  2. 02

    Receive and document the sample

    The source, condition, quantity, packaging, and preparation instructions are checked before the specimen is prepared.

  3. 03

    Prepare and measure

    The specimen is tested at the agreed as-received or controlled condition; a dry-out program uses repeated measurements as moisture is progressively reduced.

  4. 04

    Report the curve and conditions

    Thermal resistivity or conductivity values are issued with moisture, density, preparation, and other information needed by the designer.

Review criteria

What the electrical or thermal designer needs from the report

Thermal rho changes with moisture, density, material fabric, temperature, and sample representativeness, so the reported condition is as important as the number.

What you receive

Typical project deliverables

  • ASTM D5334 / IEEE 442 test report
  • As-received or specified-condition data
  • Multi-point thermal dry-out curve
  • Sample molding and moisture-density documentation

Common project needs

When this service is useful

  • Underground power and transmission
  • Solar and renewable-energy projects
  • Data centers and substations
  • Backfill and concrete material selection

Nationwide testing

Ship samples from any U.S. project—or request a field survey.

Calicore coordinates soil, backfill, concrete, grout, and slurry samples from major U.S. project markets. Regional context helps plan a representative program, while the laboratory result remains tied to the actual material, moisture, density, and preparation.

Browse 260 location guides How field thermal surveys work
CaliforniaLos Angeles–Long BeachCaliforniaRiverside–San Bernardino / Inland EmpireArizonaPhoenix–MesaTexasDallas–Fort WorthTexasHoustonGeorgiaAtlantaDistrict of Columbia · Virginia · Maryland · West VirginiaWashington–Arlington–AlexandriaNew York · New Jersey · ConnecticutNew York City–NewarkIllinois · Indiana · WisconsinChicagoOhioColumbusColoradoDenver–AuroraWashingtonSeattle–Tacoma

Frequently asked

Thermal Resistivity Testing questions

Can you test at a specified moisture content?+

Yes. The requested moisture content, dry density, preparation method, equilibration, and interpolation approach should be defined so the result matches the design question.

Do you accept shipped samples?+

Yes. Soil and material samples can be shipped to the laboratory with project-specific quantity and packaging instructions.

What should I send for a thermal resistivity testing quote?+

Send the material type, sample count, governing specification, required units and condition, and report deadline. Include target density for remolded soil and casting or curing information for concrete. We confirm pricing, specimen requirements, and turnaround in business days before testing.

Is thermal resistivity testing the same as a Wenner test?+

No. Thermal resistivity describes resistance to heat flow. Wenner four-pin testing measures soil electrical resistivity for grounding and related applications. Tell us which property the specification requires.

Technical guides

Learn more about thermal resistivity testing.

Use these technical articles to understand the methods, limitations, evidence, and decisions behind the service.

Related services

View Specialty Materials Testing
Materials TestingIn-Situ Thermal Resistivity SurveysMaterials TestingConcrete Thermal Resistivity TestingMaterials TestingThermal Conductivity Testing for Soil & ConcreteMaterials TestingThermal Testing Company for Soil, Concrete & Backfill

Request a proposal

What to send us to begin

Send the test specification, sample count, material and source, target density or moisture when applicable, required report units, and deadline. We will confirm preparation, shipping instructions, pricing, and turnaround in business days.

Request a proposal