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Per §8.4.2 and Table 8.6, the coefficient of thermal expansion of concrete typically varies with:
A{'text': 'Curing time alone, independent of mix', 'label': 'A'}
B{'text': 'Aggregate density only, regardless of mix', 'label': 'B'}
C{'text': 'Water-cement ratio and the type of aggregate used', 'label': 'C'}
D{'text': 'Only with the colour of the concrete', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Water-cement ratio and the type of aggregate used', 'label': 'C'}
1. §8.4.2 closes Table 8.6 with: 'It can be observed that the coefficient increases with increase in water/cement ratio and varies with type of aggregate used.'
2. The same table contrasts calcareous gravel concrete with expanded shale and shows the effect of curing humidity.
_Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.4.2 and Table 8.6, p. 72_
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