Discussion
Belite-rich cements are proposed as a lower-carbon option because belite
Answer: D
Correct answer: forms at a lower burning temperature than alite
Belite forms by solid-state reaction from about 1,200 degrees, while alite needs a liquid phase at around 1,450. A belite-rich cement therefore burns cooler, saving fuel, and needs less lime, saving process emissions. The cost is slow early strength, which is why such cements suit mass concrete rather than general use.
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