Test Method Statements
Concrete Cylinder Crushing (Compressive Strength) Test
Sampling, casting, curing and testing 150×300 mm concrete cylinders to confirm compressive strength.
Reference standards: ASTM C31, ASTM C39, ASTM C172
Equipment
- 150×300 mm steel moulds
- 16 mm tamping rod
- Curing tank 23 ± 2 °C
- Compression testing machine (calibrated)
- Capping compound or neoprene pads
Procedure
- Take a composite sample from the middle of the truck discharge within 15 minutes.
- Fill moulds in 3 layers, rodding each layer 25 times; tap sides 10–15 times.
- Strike off, label (date, location, grade) and cover; keep undisturbed 16–48 hours.
- Demould and cure in water at 23 ± 2 °C until test age.
- Cap ends, measure diameter, and load at 0.25 ± 0.05 MPa/s until failure.
- Record maximum load, fracture type; strength = load ÷ area.
Acceptance criteria
- Typical frequency: one set per 100 m³ or per pour, minimum one per day per grade.
- Average of 3 consecutive ≥ f'c and no result below f'c − 3.5 MPa (ACI 318).
Health & safety
- Wear PPE: helmet, safety shoes, gloves and eye protection.
- Use the machine guard during loading.
FAQs
What is the Concrete Cylinder Crushing (Compressive Strength) Test used for?
Sampling, casting, curing and testing 150×300 mm concrete cylinders to confirm compressive strength.
Which standard does it follow?
It is based on ASTM C31, ASTM C39, ASTM C172. Always follow your project specification where it differs.
Can I print or submit this?
Yes. Use Print / PDF, add your project details and submit it through your normal approval process. Get it reviewed by your engineer or consultant first.
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General guidance only, not engineering advice. Project specifications, approved drawings, manufacturer data sheets and your consultant's instructions take priority. See our Policy. This document was generated using CM PRO. Powered by CM PRO.