Safety, Test Standards, Records, and Reporting
Safety, test standards, records, and reporting is the domain that separates a technician who gets valid numbers from one who can defend them. The exam tests hazard control, the correct ASTM reference for each task, and documentation that preserves traceability.
Safety
- PPE: safety glasses, gloves, and boots when handling concrete, caps, and chemicals.
- Isopropanol is flammable; keep it away from ignition sources and use ventilation.
- Capping compounds and cleaning acids can burn skin and eyes; know the SDS and eyewash location.
- Pressure air meters store energy; follow the manufacturer's charging and venting procedure.
- Lift cylinders with proper technique; use two hands or a cart, not a bent-back lift.
Standards and records
Know which standard governs: C172 sampling, C143 slump, C231/C173 air, C1064 temperature, C138 unit weight, C31/C192 specimens, C617 caps, C1231 pads, C39 strength, C42 cores. Records must include sample location, mix design, time, specimen IDs, curing history, test age, dimensions, failure load, calculated strength, and any deviation. Correct errors with a single line-through and initials; no correction fluid.
Worked example
A calculated strength is 3,687 psi. C39 reports to the nearest 10 psi, so record 3,690 psi. Also record the failure load (46,350 lb), cylinder diameter, and test age. If the cylinder was capped 0.20 in thick, note the deviation - the cap exceeds the 1/8 in C617 limit and the result may be invalid.
Traps
Reporting calculated values without raw data; missing calibration dates; using correction fluid; failing to record deviations; and citing the wrong ASTM standard for a test.