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San Antonio, Texas
Construction Materials Testing in San Antonio, TX
Concrete, soil, and aggregate testing in San Antonio, Texas — 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
- Austin, TX 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
- San Antonio and the surrounding TX area — Austin, Houston
- Coverage
- Texas statewide · 27 regional hubs
- Technicians
- ACI Grade I · NICET CMT · ICC special inspectors
- Call us
- (346) 420-5425
Scope
What we test in San Antonio
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 San Antonio
San Antonio's construction market is defined by its geology and its pace. The region sits atop and adjacent to the Balcones Escarpment, where contractors routinely encounter expansive clays in the upper soil profile before hitting caliche or limestone bedrock — conditions that demand verified compaction and classification data, not assumptions. Above grade, the Texas Hill Country climate means concrete placements face high summer temperatures and low relative humidity that accelerate slump loss and affect hydration, making timely field testing a technical necessity rather than a formality. Commercial and infrastructure construction across the San Antonio metro spans hospitality, healthcare, distribution, and TxDOT-governed roadwork — all project types where materials data must be defensible to the owner, the engineer of record, and the authority having jurisdiction. Our certified field technicians serve San Antonio projects dispatched through our Austin regional hub, delivering ASTM-compliant concrete, aggregate, and soil testing with a documented quality system behind every result.
San Antonio-area soils commonly include high-plasticity clays that are sensitive to moisture variation, making accurate Proctor curve development and in-place density verification especially important before and during earthwork. Summer concrete placements in the South Texas heat require close attention to fresh concrete temperature per ACI 305 hot-weather guidelines, with field testing timed to catch conditions before they drift outside specification.
FAQ · San Antonio
My San Antonio project has highly plastic clay subgrade. Which soil classification and compaction tests should I be specifying?
For expansive clay subgrades common to the San Antonio region, specification should include ASTM D2487 for Unified Soil Classification, ASTM D4318 for Atterberg limits to characterize plasticity, and a Standard or Modified Proctor curve (ASTM D698 or D1557) appropriate to the compaction energy specified. In-place density is then verified by nuclear gauge (ASTM D6938) or sand-cone (ASTM D1556) against that curve.
How does the summer heat in San Antonio affect what your technicians do during a concrete pour?
High ambient temperatures accelerate cement hydration and slump loss, so technicians prioritize getting to the truck quickly after discharge. Fresh concrete temperature is measured per ASTM C1064, and ACI 305R sets 95°F as a common maximum concrete temperature threshold. If temperature, slump (ASTM C143), or air content (ASTM C231) approach specification limits, the technician documents conditions so the engineer of record can make an informed acceptance decision.
TxDOT has specific testing frequency requirements on my San Antonio roadwork project. Can you work to those frequencies rather than just a standard schedule?
Yes. Technicians follow the testing frequencies and documentation requirements written into the project specification or the governing agency's standard, including TxDOT special provisions where applicable. The test methods themselves remain ASTM-designated — for example, ASTM C172 for sampling, ASTM C39 for compressive strength — but the schedule, lot sizes, and acceptance criteria are driven by what the contract documents and the engineer of record require.
How fast can a technician be on site in San Antonio?
San Antonio work is dispatched through our Austin, TX 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 San Antonio, TX?
Field work in San Antonio is dispatched through the Austin, TX regional hub, about 74 miles away. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large San Antonio projects.
Are the technicians you send to San Antonio 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 Texas agencies or owners require state-specific certifications, those are confirmed in the proposal.
Hiring for project coverage. Field technician openings in San Antonio · all positions.
Scheduling & proposals
Need construction materials testing in San Antonio?
Call to schedule a technician, or send project documents for a written proposal.