Discussion
An ordinary Portland cement has a Blaine fineness of 320 square metres per kilogram. How much surface area is present in a 50 kg bag?
Answer: C
Correct answer: 16,000 square metres
\[ 320\ \mathrm{m^2/kg} \times 50\ \mathrm{kg} = 16{,}000\ \mathrm{m^2}. \] That is about two hectares of surface in one bag, which is worth pausing over: it is the reason cement hydrates as quickly as it does, and the reason its water demand is what it is.
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