Discussion
Portland slag cement uses which material as its blending component?
Answer: B
Correct answer: ground granulated blast furnace slag
The slag is a by-product of iron making, quenched rapidly so that it solidifies as a glass rather than crystallising, then ground. That glassy state is what makes it latently hydraulic: activated by the alkali and lime from the Portland fraction, it hydrates to give a denser paste with lower heat evolution and much better resistance to sulphate and chloride.
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