Discussion
The Blaine air permeability apparatus determines fineness by measuring
Answer: C
Correct answer: the time for air to pass through a compacted bed
Air is drawn through a bed of cement compacted to a known porosity, and the time taken is recorded. Finer cement offers more surface for the air to drag against, so it takes longer, and the Kozeny–Carman relation converts that time into a specific surface figure in square metres per kilogram.
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