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Clackamas County, Oregon
Construction Materials Testing in Clackamas County, OR
Concrete, soil, and aggregate testing in Clackamas 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
- Clackamas 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 Clackamas 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 Clackamas County
Clackamas County sits at the convergence of the Willamette Valley's alluvial lowlands and the foothills of the Cascades, giving construction projects here a soil profile that shifts quickly — from compressible silts and clays near the valley floor to volcanic-origin gravels and weathered basalt as terrain rises toward Mount Hood. Winter rainfall that regularly pushes soil moisture above optimum, combined with freeze-thaw exposure at higher elevations, makes rigorous materials testing less a formality and more a project control tool. Our firm dispatches ACI- and NICET-certified field technicians into Clackamas County through our regional hub network to deliver ASTM-compliant testing of concrete, aggregate, and soil — fresh concrete properties and cylinder breaks, aggregate gradation and quality, Proctor compaction and nuclear density, soil classification, and soil corrosivity — backed by a laboratory operating under a documented quality system. Reports are prepared for third-party review and specification audits.
Soils across the Clackamas County lowlands frequently include fine-grained alluvial and lacustrine deposits that are moisture-sensitive and prone to density variability; extended Oregon rainy seasons can push in-place moisture well above Proctor optimum, making timely compaction verification and accurate moisture-density relationships critical to achieving specification compliance. Concrete placements during cooler months should account for Oregon's sustained low temperatures, which can extend set times and require cold-weather monitoring consistent with ACI 306 guidelines.
FAQ · Clackamas County
The soils on our Clackamas County site look highly variable — silty near the low areas and gravelly upslope. Does that change how many Proctor tests we need?
Yes. When visual classification or ASTM D2487 grain-size analysis reveals distinct soil types within a single project, a separate moisture-density relationship (ASTM D698 or D1557, per your specification) is required for each material type. Running a single Proctor on a mixed borrow and applying it across the site creates real compaction variance risk. We identify material changes in the field and flag when additional curves are warranted.
We're placing concrete for a tilt-up warehouse in Clackamas County in November. What testing adjustments apply to cold-weather pours?
Oregon's sustained fall and winter temperatures can slow hydration and compress the margin between placement and freezing. We document fresh concrete temperature at point of discharge per ASTM C1064, verify air content per ASTM C231, and record ambient conditions. Results feed directly into cold-weather protection decisions aligned with ACI 306R. Cylinder sets can also be field-cured to evaluate actual in-place strength development under site conditions.
Clackamas County has active residential and light industrial development along the valley corridor. How do you handle concurrent testing across multiple active projects?
We coordinate scheduling through our regional dispatch system, which allows technicians to sequence site visits across multiple projects in a defined area on the same day. At project kickoff we establish testing frequencies, notification lead times, and report routing so field coverage aligns with your pour schedule or earthwork production rate rather than reacting to it. Contact our coordination team early in a project to set that cadence.
How fast can a technician be on site in Clackamas County?
Clackamas 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 Clackamas County, OR?
Field work in Clackamas County is dispatched through the Seattle, WA regional hub, about 152 miles away. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large Clackamas County projects.
Are the technicians you send to Clackamas 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 Clackamas County?
Call to schedule a technician, or send project documents for a written proposal.