About this code
Standard test methods for hardened concrete — cube and cylinder compressive strength, flexural strength, splitting tensile strength.
Key sections
- 01Cube compressive strength
- 02Cylinder strength
- 03Flexural strength
- 04Splitting tensile
- 05Sampling and curing
Critical clauses
Clause 5.0Cube Test Procedure
150mm cubes, 28-day water cure, loaded at 14 N/mm2/min.
In practiceMost common QC test in India.
Clause 5.5Acceptance
Read with IS 456 clause 16.
In practiceMean of 4 >= fck + 0.825σ.
Clause 6.0Flexural Test
100x100x500 prism, 4-point load.
In practiceUsed for pavements and PQC.
Practical implications
For specifiers
Specify cube count per IS 456.
For suppliers
Calibrated CTM mandatory.
For executors
Cast cubes from each pour, mark properly.
FAQs
Cube vs cylinder strength?
Cylinder ~ 0.8 × cube. India uses cubes; US uses cylinders.
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