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Per §4.4, the cheapest and most commonly used accelerating admixture for early-strength development is:
A{'text': 'Triethanolamine organic compound', 'label': 'A'}
B{'text': 'Calcium chloride (CaCl2)', 'label': 'B'}
C{'text': 'Soluble sodium silicate liquid', 'label': 'C'}
D{'text': 'Aluminium sulphate (Al2(SO4)3)', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Calcium chloride (CaCl2)', 'label': 'B'}
1. §4.4 reads: 'the most common material used as an admixture to accelerate the early strength development of concrete is calcium chloride.'
2. The same section names triethanolamine, soluble carbonates and fluorosilicates as alternatives, but CaCl2 'being cheapest is still very commonly used'.
_Source: IGNOU ET-522 Block-1 Unit-4 Admixtures, §4.4, p. 47_
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