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Per §4.13, the use of a pozzolanic admixture does NOT typically achieve which of the following effects?
A{'text': 'Lower heat of hydration and thermal shrinkage', 'label': 'A'}
B{'text': 'Reduced alkali-aggregate reaction risk', 'label': 'B'}
C{'text': 'Improved resistance to sulphate soils and sea water', 'label': 'C'}
D{'text': 'Faster very-early strength gain in cold weather', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Faster very-early strength gain in cold weather', 'label': 'D'}
1. §4.13 lists pozzolana benefits as: lower heat of hydration and thermal shrinkage, increased water tightness, reduced alkali-aggregate reaction, improved sulphate/sea-water resistance, improved LATER strength, and improved workability.
2. Early-age strength is typically lower with pozzolana — fast cold-weather early strength is not on the list of improvements.
_Source: IGNOU ET-522 Block-1 Unit-4 Admixtures, §4.13, p. 55_
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