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Per §7.2 ('Maturity of Concrete'), the datum temperature taken in maturity calculations (because hydration almost ceases at this point) is:
A{'text': '+38 degree C (warm cure)', 'label': 'A'}
B{'text': '0 degree C (freezing point)', 'label': 'B'}
C{'text': '+18 degree C (standard cure)', 'label': 'C'}
D{'text': '-11 degree C (eleven below zero)', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': '-11 degree C (eleven below zero)', 'label': 'D'}
1. §7.2 (Maturity of Concrete): 'hydration almost ceases at a temperature of -11°C and for measurement of temperature in case of maturity we shall take -11° as datum line.'
2. Maturity M = Σ (time × (temperature - (-11°C))) and is reported in °C-hr or °C-days.
_Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.2 (Maturity), p. 50_
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