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Washington County, Oregon
Construction Materials Testing in Washington County, OR
Concrete, soil, and aggregate testing in Washington County, Oregon — fresh concrete tests and cylinder breaks, Proctor and nuclear density, gradation, Atterberg limits, and soil corrosivity — by ACI- and NICET-certified technicians, with results reviewed and issued under a documented quality system.
- Dispatched from
- Seattle, WA regional hub · project-based mobilization
- Lead time
- Set in the proposal, with mobilization planned around your pour and earthwork schedule
- Laboratory
- Sugar Land, TX laboratory under chain of custody, or a mobile laboratory for large projects
- Reporting
- Reviewed and issued under a documented quality system; formatted for owner, engineer, and building-official review
- Serving
- Washington County, OR — Portland, Eugene, Salem
- Coverage
- Oregon statewide · 27 regional hubs
- Technicians
- ACI Grade I · NICET CMT · ICC special inspectors
- Call us
- (346) 420-5425
Scope
What we test in Washington County
Concrete testing services
Fresh concrete sampled and tested at the pour — slump, air content, unit weight, and temperature — with cylinders and beams cast on site and broken in the laboratory on the schedule your specification calls for.
ASTM C172ASTM C143ASTM C231ASTM C173ASTM C138ASTM C1064ASTM C31ASTM C39
Aggregate testing services
Gradation, fines content, specific gravity and absorption, unit weight, abrasion resistance, and stockpile moisture for concrete, base course, and backfill aggregates.
ASTM D75ASTM C136ASTM C117ASTM C127ASTM C128ASTM C29ASTM C131ASTM C566
Soil compaction and density testing
Standard and modified Proctor curves in the laboratory and in-place density by nuclear gauge on every lift, so fill, subgrade, and trench backfill are documented against the specified percent compaction.
Soil classification and index testing
Sieve and hydrometer gradation, Atterberg limits, moisture content, specific gravity, and USCS classification for earthwork acceptance, select-fill verification, and geotechnical reports.
ASTM D6913ASTM D7928ASTM D1140ASTM D4318ASTM D2216ASTM D854ASTM D2487
Soil corrosivity testing
pH and electrical resistivity of backfill for MSE walls, pipelines, and buried structures, reported against the specification limits for metallic and geosynthetic reinforcement.
Special inspection (IBC Chapter 17)
ICC-certified special inspectors for reinforced concrete and soils, reporting to the building official alongside the materials test results, so one agency covers both requirements.
Full scope, standards list, and pricing basis: Construction Materials Testing.
Local conditions
Construction materials testing conditions in Washington County
Washington County is one of the fastest-growing counties in Oregon, with active residential subdivision, commercial corridor, and light-industrial development concentrated along the US-26 and OR-217 corridors. The region's combination of Tualatin Valley basin soils — often soft, compressible, and moisture-sensitive — and a marine-influenced climate with wet winters and mild summers creates real compaction and concrete-placement challenges that require disciplined testing protocols, not guesswork. Our firm dispatches certified field technicians into Washington County from a regional hub to perform ASTM-compliant concrete, aggregate, and soil testing throughout the project lifecycle. Fresh concrete testing, cylinder fabrication and breaks, aggregate gradation, Proctor compaction standards, nuclear density gauge readings, soil classification, and soil corrosivity assessments are all performed under a documented quality system designed to produce defensible data your geotechnical engineer, structural engineer of record, and building department can rely on.
Washington County soils in low-lying Tualatin Valley areas are frequently fine-grained, with high moisture content through much of the year, making Proctor moisture-density relationships and compaction verification particularly important during earthwork and subgrade preparation. Oregon's wet season can extend concrete placement windows and affect curing conditions, so consistent fresh concrete testing — slump, air content, temperature, and unit weight per ASTM C143, C231, C1064, and C138 — is especially valuable on projects scheduled from late fall through spring.
FAQ · Washington County
Washington County winters are long and wet — what concrete tests matter most when we're placing in cold or wet conditions?
Concrete temperature at point of discharge must be recorded per ASTM C1064 on every load during cold or marginal weather. If mix temperature approaches 50°F or below, ACI 306R cold-weather placing guidance applies, and your engineer of record may require additional cylinder sets cured under job-site conditions alongside standard lab-cured cylinders. Documenting these variables at the point of placement gives you defensible data if strength results are later questioned.
Our grading contractor is working in Tualatin Valley soils that seem to change character across the site — how do you handle variable soil conditions during compaction testing?
When soil type changes visibly between lifts or areas, a new laboratory Proctor compaction curve (ASTM D698 or D1557, per project specification) is required to establish the correct maximum dry density for that material. Running compaction against the wrong Proctor is a common source of failing test results. Our technicians collect samples for re-classification and Proctor when field conditions indicate the reference curve may no longer apply.
Washington County Building Permits Office requires special inspection — does materials testing satisfy that requirement?
Materials testing generates the data that supports special inspection documentation under IBC Chapter 17, but the two are distinct scopes. Concrete cylinder breaks and compaction tests feed into the inspection record; a separately designated special inspector of record typically compiles and certifies the final statement of special inspections. Coordinate with your engineer of record and the Washington County Building Permits Office early to confirm which test types must appear in the special inspection program.
How fast can a technician be on site in Washington County?
Washington County work is dispatched through our Seattle, WA regional hub. Scheduled visits are set up by phone at (346) 420-5425; multi-day placements and full-time project assignments are scheduled through a proposal request.
Which office covers materials testing in Washington County, OR?
Field work in Washington County is dispatched through the Seattle, WA regional hub, about 147 miles away. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large Washington County projects.
Are the technicians you send to Washington County certified?
Yes. Concrete technicians hold ACI Concrete Field Testing Technician Grade I; soils and laboratory technicians hold NICET Construction Materials Testing certifications; special inspection is performed by ICC-certified special inspectors. Where Oregon agencies or owners require state-specific certifications, those are confirmed in the proposal.
Scheduling & proposals
Need construction materials testing in Washington County?
Call to schedule a technician, or send project documents for a written proposal.