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Per §7.2 ('Richness of Mix'), the aggregate/cement ratio is typically taken as 'very rich' and 'very lean' respectively at values of about:
A{'text': '1 and 4', 'label': 'A'}
B{'text': '0.5 and 1.5', 'label': 'B'}
C{'text': '20 and 50', 'label': 'C'}
D{'text': '2.5 and 10', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': '2.5 and 10', 'label': 'D'}
1. §7.2 (Richness of Mix) reads: 'The aggregate/cement ratio may vary generally between 2.5 to 10 where 2.5 and 10 is to be taken as very rich and very lean mix respectively.'
2. At constant water-cement ratio, a leaner mix has fewer voids per unit concrete volume and so slightly higher strength.
_Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.2, p. 47_
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