Discussion
Consider the following data for concrete with mild exposure:
Water-cement ratio = 0.6
Water = 195 liter
The required cement content will be:
Answer: C
The required cement content is 325 kg/m\(^{3}\).
The water-cement ratio is the mass of water divided by the mass of cement, and 195 litres of water weighs 195 kg:
\[ \begin{aligned} \text{cement} &= \frac{\text{water}}{w/c} = \frac{195}{0.6} \\ &= 325\ \text{kg/m}^3 \end{aligned} \]
This is above the IS 456 minimum of 300 kg/m\(^{3}\) for reinforced concrete in mild exposure, so it is adopted. Multiplying instead of dividing gives 117 kg/m\(^{3}\), which is not offered; 472, 383 and 294 kg/m\(^{3}\) correspond to other water-cement ratios.
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