Test Method Statements
Concrete Core Test
Drilling and testing cores to check in-place strength when cylinder results are low.
Reference standards: ASTM C42, ACI 318 §26.12
Equipment
- Core drilling machine with diamond bit
- Rebar scanner
- Compression machine
Procedure
- Scan and mark rebar; select locations approved by the structural engineer.
- Drill cores (diameter ≥ 3 × aggregate size, L/D ≈ 2).
- Condition cores as per ASTM C42 (sealed bags, 5 days).
- Trim, cap and test in compression; apply L/D correction factors.
- Repair holes with non-shrink grout.
Acceptance criteria
- Average of 3 cores ≥ 0.85 f'c and no single core < 0.75 f'c (ACI 318).
Health & safety
- Wear PPE: helmet, safety shoes, gloves and eye protection.
- Use water cooling and keep hands clear of the bit.
FAQs
What is the Concrete Core Test used for?
Drilling and testing cores to check in-place strength when cylinder results are low.
Which standard does it follow?
It is based on ASTM C42, ACI 318 §26.12. 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.