Home / Services / Materials Testing / Multnomah County, OR
Multnomah County, Oregon
Construction Materials Testing in Multnomah County, OR
Concrete, soil, and aggregate testing in Multnomah 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
- Multnomah 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 Multnomah 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 Multnomah County
Multnomah County sits at the convergence of the Columbia and Willamette rivers, where a wet marine climate, seismically active geology, and a mix of dense urban infill, bridge infrastructure, and large-scale transit construction create real demands on construction materials. Concrete placed during the extended cool, rainy season requires careful attention to fresh concrete properties — temperature, slump, and air content — to meet specification limits and protect long-term strength gain. Native soils across the county vary from alluvial silts and clays near the river corridors to volcanic-derived materials on the West Hills slopes, making soil classification and compaction verification consequential decisions, not formalities. Our certified technicians dispatch from a regional hub to provide ASTM-compliant field and laboratory testing of concrete, aggregate, and soil. Every engagement runs under a documented quality system, and reports are structured to be defensible to project engineers, owners, and public agency reviewers.
Multnomah County's river-adjacent lowlands commonly contain compressible alluvial soils — silts and soft clays — that warrant careful moisture-density and classification work before fill placement or foundation construction. Extended rainy seasons from fall through spring can affect concrete placement windows and soil workability, making timely test results particularly important for schedule management.
FAQ · Multnomah County
Multnomah County has a long rainy season — how does wet weather affect concrete testing requirements on our project?
Cool, wet conditions slow cement hydration and can mask inadequate mix performance if testing is deferred. ASTM C31 requires concrete test cylinders to be protected from freezing and kept within specified temperature ranges during initial curing. During Oregon's rainy season, technicians verify fresh concrete temperature per ASTM C1064 and document ambient conditions so the project record reflects any temperature-related curing risk relevant to ACI 306R cold-weather guidance.
How do you handle soil compaction testing on projects near the Willamette or Columbia river corridors where subgrade soils are soft or variable?
Alluvial silts and soft clays common to lowland areas require a baseline Proctor curve — ASTM D698 or D1557 depending on the compaction energy specified — matched to the actual material being placed. If soil types change across a site, additional Proctor testing is needed for each distinct material. Nuclear gauge density testing per ASTM D6938 is then referenced against the correct curve for each zone.
Portland has active ODOT and TriMet projects — can you meet public agency reporting and documentation formats for Oregon DOT or transit work?
Our reports document test methods, results, specimen identification, and technician certification in a format structured for project file review and owner submittals. For ODOT-influenced specifications or transit project requirements, we recommend confirming specific report format or submittal requirements with your project engineer or inspector of record early, as agency formats can vary and our documentation can be tailored accordingly.
How fast can a technician be on site in Multnomah County?
Multnomah 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 Multnomah County, OR?
Field work in Multnomah County is dispatched through the Seattle, WA regional hub, about 145 miles away. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large Multnomah County projects.
Are the technicians you send to Multnomah 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 Multnomah County?
Call to schedule a technician, or send project documents for a written proposal.