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Per §8.9, the 'Ocrate Process' described as a surface treatment for improving concrete durability consists of:
A{'text': 'Sand blasting with carborundum and bitumen sealing', 'label': 'A'}
B{'text': 'Coating with polyurethane and chlorinated rubber paints', 'label': 'B'}
C{'text': 'Treatment with sodium silicate under vacuum', 'label': 'C'}
D{'text': 'Impregnation with silico fluoride under pressure', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Impregnation with silico fluoride under pressure', 'label': 'D'}
1. §8.9: 'Ocrate Process is another important surface treatment in which the concrete member is impregnated with silico fluoride under pressure. This process is very useful in improving durability of precast concrete pipes for sewage disposal and piles for foundation.'
2. Polymer impregnation is a separate, more modern treatment listed in the same section.
_Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.9, p. 78_
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