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Johnson County, Iowa
Construction Materials Testing in Johnson County, IA
Concrete, soil, and aggregate testing in Johnson County, Iowa — 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
- Chicago, IL 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
- Johnson County, IA — Des Moines, Cedar Rapids, Davenport
- Coverage
- Iowa 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 sits at the center of one of Iowa's most active construction corridors, anchored by a major research university, a growing healthcare campus, and steady residential and light-industrial expansion across communities like Iowa City, Coralville, and North Liberty. Iowa's glacially derived soils — often silty, sometimes expansive, and seasonally frost-affected — demand rigorous foundation and subgrade verification before a slab or structure goes up. Short construction windows between late-spring thaw and early-winter freeze make accurate, timely materials data critical to keeping schedules intact and avoiding costly rework. Our firm dispatches certified field technicians to Johnson County project sites for ASTM-compliant testing of concrete, aggregate, and soil. Fresh concrete evaluation, compressive-strength cylinder breaks, aggregate gradation, Proctor compaction curves, nuclear density, soil classification, and corrosivity testing are all performed under a documented quality system and reported in a format prepared for third-party review.
Iowa's glacially influenced subsoils frequently include fine-grained, frost-susceptible materials that warrant careful Proctor (ASTM D698 / D1557) and in-place density verification, particularly for subgrade and utility-trench backfill work. Concrete placement scheduling in Johnson County should also account for the region's cold-weather seasons, where ACI 306R cold-weather concreting practices become relevant from late autumn through early spring.
FAQ · Johnson County
Iowa City's frost depth affects my foundation design — what soil testing supports that work?
Frost penetration in this part of Iowa commonly reaches significant depths, making soil classification and moisture-density relationships foundational data. We perform grain-size analysis (ASTM D6913), Atterberg limits (ASTM D4318), and standard or modified Proctor (ASTM D698 / D1557) to characterize subgrade soils. Those results inform freeze-thaw susceptibility assessments and help engineers specify appropriate frost protection depths and subgrade preparation requirements.
How far out should I schedule a technician for a Johnson County project, given you dispatch from Chicago?
Johnson County is covered through our Chicago regional hub, roughly 200 miles away. We recommend requesting scheduled visits at least 48 to 72 hours in advance to confirm technician availability and travel logistics. Project-based agreements allow us to build recurring inspection schedules around your concrete pours and earthwork phases, reducing last-minute coordination and keeping your progress on track.
What concrete tests are performed during a pour visit on a University of Iowa-area project subject to ACI 318 requirements?
A standard field visit includes slump (ASTM C143), air content (ASTM C231), concrete temperature, and unit weight (ASTM C138). Standard-cured compressive-strength cylinders are cast per ASTM C31 and broken at specified ages per ASTM C39. Documentation aligns with ACI 318 structural concrete requirements and supports project records for engineer of record review and, where applicable, IBC Chapter 17 special inspection compliance.
How fast can a technician be on site in Johnson County?
Johnson County work is dispatched through our Chicago, IL 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, IA?
Field work in Johnson County is dispatched through the Chicago, IL regional hub, about 202 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 Iowa 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.