alleryStart learning →Per §7.2 ('Richness of Mix'), the aggregate/cement ratio is typically taken as 'very rich' and 'very lean' respectively at values of about:
A1 and 4
B0.5 and 1.5
C20 and 50
D2.5 and 10
Answer & Solution
Correct answer: D. 2.5 and 10
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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