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Per §8.6, cavitation resistance of concrete is best improved by:
A{'text': 'Increasing the surface roughness with a coarse broom finish during placing', 'label': 'A'}
B{'text': 'Providing a smooth, well-cured surface with epoxy / polymer overlay', 'label': 'B'}
C{'text': 'Reducing the cement content per cubic metre below the design minimum', 'label': 'C'}
D{'text': 'Adding more entrapped air voids to the mix to absorb the cavitation pulses', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Providing a smooth, well-cured surface with epoxy / polymer overlay', 'label': 'B'}
1. §8.6(c): 'To avoid cavitation, provide smooth surface free from irregularities. Use well cured, smooth finished high strength concrete. Epoxy screeding and polymer application to the surface improves resistance against cavitation.'
2. Rough surfaces ENCOURAGE cavitation by promoting flow detachment; entrapped air voids hurt strength.
_Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.6(c), p. 75_
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