MAKE YOUR CONCRETE MORE DURABLE
- Fresh concrete has an inhurent tendency to crack and preventive measures at hthe time of placing and curing remain the best means of minimicing cracking
- When concrete is placed under high ambient temperatures / low humidity / windy conditions, cracks appear during the setting/hardening period due to evaporation of water from the concrete surface.
- Cracks appear in winter also under windy conditions. Further delay in curing would widen and deepen such cracks thereby causing leakages through slabs.
- These cracks are known as PLASTIC SHRINKAGE cracks and are commonly observed in concrete footings and slabs. These cracks are classified as non-structural and do not affect structural stability; however, the cracks have to be sealed to achieve the intended serviceability of the structure,
PREVENTIVE MEASURES TO REDUCE AND CONTROL PLASTIC SHRINKAGE
CRACKING IN CONCRETE
- AFTER PLACING THE CONCRETE DO NOT ALLOW CONCRETE TO DRY. START CURING AS SOON AS POSSIBLE. > Moisten the formwork and reinforcement before placing the concrete to prevent moisture loss from concrete.
- Arrange adequate manpower to place, compact, finish and cure the concrete without any delays.
- ▸ Protect concrete during any appreciable delay between placing and finishing Float properly after placing the concrete.
- Cover with plastic sheet immediately after finishing, or, Start sprinkling / misting concrete surfaces (care must be taken not to use high pressure hose pipe to sprinkle. they may damage the surface/ wash away cement particles). The plastic sheet needs to be held down properly, if this option is chosen.
- After the concrete is sufficiently stiffened, place wet hessian on the concrete surface and cover it with plastic sheet to keep the hessian wet for longer time. Make arrangements to keep the hessian wet all the time for the entire specified curing period.
- Alternatively, pond water and cure continuously for the specified period, or for at least 7 days. > Ensure appropriate and adequate curing under all circumstances.
REFERENCES
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