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Per §8.6, which definition is correct?
A{'text': 'Cavitation is damage from non-linear flow of water at velocities above 12 m per second', 'label': 'A'}
B{'text': 'Abrasion is the wearing action of flowing fluids on the concrete external surface', 'label': 'B'}
C{'text': 'Erosion is the wearing action that occurs through dry friction between surfaces', 'label': 'C'}
D{'text': 'Erosion and abrasion are exact synonyms in the §8.6 nomenclature of the source', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Cavitation is damage from non-linear flow of water at velocities above 12 m per second', 'label': 'A'}
1. §8.6 explicitly distinguishes: 'Erosion refers to the wearing action by fluids while abrasion occurs through friction. Cavitation refers to damage which occurs due to non-linear flow of water at velocities greater than 12 metres per second.'
2. The Key Words §8.12 re-states: Abrasion = wearing action by friction; Erosion = wearing action by fluids.
_Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.6 and Key Words §8.12, pp. 75 and 80_
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