Discussion
Alkali sulphates in clinker are found chiefly
Answer: D
Correct answer: in the interstitial material and on crystal surfaces
Alkalis and sulphur volatilise in the burning zone and condense further back, so they end up concentrated in the last material to solidify and on the surfaces of the crystals. Being at the surface makes them readily soluble, which is why they influence early setting and the alkali content of the pore solution out of proportion to their quantity.
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