Concrete Cube Testing Safety

Concrete cube testing verifies that delivered concrete meets the specified compressive strength.
Cubes are cast on site during concrete pours and sent to an accredited laboratory for crushing.
The process involves handling wet concrete, filling steel moulds, and curing the specimens safely.
Wet concrete is highly alkaline (pH 12-13) and causes chemical burns on unprotected skin.
Filled concrete cube moulds weigh approximately 8 kg each and require careful manual handling.
Cubes must be stored in a secure area on site where they will not be disturbed during initial curing.
Temperature-controlled curing tanks may contain water with residual alkalinity from previous specimens.
The sampling location on site may be near active concrete pumping with associated strike hazards.
Test results are critical for structural acceptance — damaged or incorrectly cured cubes cause delays.
BS EN 12390 and BS 8500 set out the requirements for concrete testing and specimen preparation.

Skin burns	Wet concrete causes chemical burns that develop slowly and can require hospital treatment.
Manual handling	Repeated lifting of filled moulds causes back and wrist strain over time.
Quality impact	Incorrectly prepared or cured cubes give false results, delaying structural acceptance.
Sampling hazards	Working near active concrete pumps and deliveries exposes testers to strike risks.

Do

Don't

Wear waterproof gloves and eye protection when handling wet concrete for cubes.
Fill and compact cube moulds following the BS EN 12390 procedure exactly.
Label each cube clearly with pour reference, date, time, and location.
Store freshly cast cubes in a secure area protected from vibration and disturbance.
Transfer cubes to a curing tank within the specified time after casting.
Use correct manual handling technique when lifting filled cube moulds.
Wash hands and forearms thoroughly after handling wet concrete.
Coordinate with the concrete pump crew to sample safely away from the discharge.
Record all sampling details on the test request form contemporaneously.
Ensure the testing laboratory is UKAS-accredited for concrete testing.

DON'T handle wet concrete without waterproof gloves — cement causes skin burns.
DON'T drop or knock cube moulds during transport — it damages the specimen.
DON'T leave freshly cast cubes where they can be disturbed by site traffic.
DON'T delay transferring cubes to the curing tank beyond the specified period.
DON'T fill cubes from a location that is unsafe or too close to the pump.
DON'T use damaged or dirty cube moulds — they affect the test result.
DON'T skip compaction — under-compacted cubes give falsely low strength results.
DON'T label cubes after the event — errors in identification invalidate results.
DON'T allow cubes to freeze or overheat during initial curing on site.
DON'T send cubes to a laboratory that is not UKAS-accredited for the test.

See also: Concrete Pour Safety | Inspection and Test Plan Awareness

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