Per §7.2 (Eq. 7.1A), Feret's strength formula for concrete incorporate…

Question

Per §7.2 (Eq. 7.1A), Feret's strength formula for concrete incorporates not just cement (C) and water (e) but also the volume of:

Accepted Answer

A. {'text': 'Entrapped air voids in the mix', 'label': 'A'}

1. §7.2 reads: 'Feret, however, in his formulation, incorporated three entrapped air voids. It says S = K (C/(C + e + a))^2 wherein… C, e and a are the absolute volumes of cement, water and air respectively.'
2. Feret's improvement over Abrams is the explicit air-void volume in the denominator.
_Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.2 (Eq. 7.1A), p. 43_

Answer

{'text': 'Coarse aggregate phase only', 'label': 'B'}

Answer

{'text': 'Fine aggregate phase only', 'label': 'C'}

Answer

{'text': 'Total mix in cubic metres', 'label': 'D'}