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Johnson County, Kansas
Construction Materials Testing in Johnson County, KS
Concrete, soil, and aggregate testing in Johnson County, Kansas — 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.
- Lead time
- Scheduled by phone or proposal; lead time confirmed when the scope is set
- 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
- Johnson County, KS — Wichita, Overland Park, Kansas City
- Coverage
- Kansas statewide · 27 regional hubs
- Technicians
- ACI Grade I · NICET CMT · ICC special inspectors
- Call us
- (346) 420-5425
Scope
What we test in Johnson 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 Johnson County
Johnson County is one of the fastest-growing counties in the Kansas City metropolitan area, with active residential subdivisions, mixed-use corridors, and commercial development pushing into previously agricultural land across cities like Overland Park, Olathe, and Lenexa. That expansion means contractors and engineers are regularly working with native soils that range from expansive clays to glacially influenced silty profiles — conditions where skipping rigorous compaction verification or concrete documentation is a liability, not a shortcut. Our firm dispatches certified field technicians from our Kansas City, MO regional hub to provide scheduled and project-based construction materials testing throughout Johnson County. We perform ASTM-compliant fresh concrete testing, compressive strength cylinder breaks, aggregate gradation and quality analysis, Proctor compaction testing, nuclear density gauge verification, soil classification, and soil corrosivity testing — all reported under a documented quality system that produces defensible records your project file, your owner, and your geotechnical engineer can rely on.
Native soils across much of Johnson County include expansive or high-plasticity clays that respond poorly to moisture fluctuation, making Proctor establishment and in-place density verification critical on any earthwork scope. Kansas City area temperature swings — including cold snaps that can arrive well into spring — mean concrete placement timing and temperature monitoring per ACI 306 cold-weather practices deserve attention on exposed or structural pours.
FAQ · Johnson County
Johnson County has a lot of active residential and commercial subdivisions right now. How do you handle testing across multiple concurrent project sites?
We coordinate multi-site coverage through our Kansas City, MO regional hub, scheduling technicians across concurrent projects based on pour schedules, earthwork milestones, and inspection hold points you communicate in advance. Providing pour notices and compaction windows as early as possible allows us to sequence field visits efficiently across your active scopes without conflict.
We're placing concrete in late October or November in Overland Park. What documentation should we expect for cold-weather pours?
Technicians record fresh concrete temperature at point of discharge per ASTM C1064 alongside standard workability and air content measurements. When temperatures approach thresholds requiring ACI 306 cold-weather precautions, those field observations are captured in the test report. Protection method documentation — blankets, enclosures, heated water — should be maintained by the contractor and referenced in the project file alongside cylinder records.
The native soils on our Olathe site were described by our geotechnical engineer as high-plasticity clay. What compaction testing protocol applies?
High-plasticity fine-grained soils are typically classified under USCS and tested for maximum dry density and optimum moisture using ASTM D1557 (modified Proctor) or ASTM D698 (standard Proctor), depending on your project specification. In-place density is then verified by nuclear gauge per ASTM D6938. Your geotechnical report's compaction specification should designate which Proctor method and target percentage applies.
How fast can a technician be on site in Johnson County?
Johnson County work is dispatched through our Kansas City, MO 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 Johnson County, KS?
Field work in Johnson County is dispatched through the Kansas City, MO regional hub, about 20 miles away. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large Johnson County projects.
Are the technicians you send to Johnson 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 Kansas agencies or owners require state-specific certifications, those are confirmed in the proposal.
Scheduling & proposals
Need construction materials testing in Johnson County?
Call to schedule a technician, or send project documents for a written proposal.