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Per §8.4.1, the thermal conductivity of concrete is shown by the source to DEPEND on all the following EXCEPT:
A{'text': 'Type of aggregate (basalt vs. quartz)', 'label': 'A'}
B{'text': 'Amount of aggregate present', 'label': 'B'}
C{'text': 'Moisture content of the concrete', 'label': 'C'}
D{'text': 'Colour of the formwork used during casting', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Colour of the formwork used during casting', 'label': 'D'}
1. §8.4.1 lists the three governing factors: type of aggregate, amount of aggregate and moisture content. Conductivity rises with moisture; basalts are low, dolomite / lime stone average, quartzites high.
2. Formwork colour is unrelated to conduction.
_Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.4.1, p. 71_
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