Discussion
State whether the following is true or false.
Limestone and wollastonite contribute lime to a body in the same way.
Answer: C
Correct answer: False
Both supply lime, but by quite different routes. Limestone must first decompose, absorbing heat and releasing carbon dioxide, and the resulting lime then reacts. Wollastonite is calcium silicate already, so it contributes its lime directly with no decomposition, no gas and no associated shrinkage step - which is exactly why it is preferred in fast firing.
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