Discussion
State whether the following is true or false.
Every low-carbon cement can be adopted at the scale of Portland cement production.
Answer: C
Correct answer: False
Cement is made in billions of tonnes a year, so any substitute must have a raw material available at that scale and near the markets. Several low-carbon cements are excellent and limited to a fraction of that volume by supply - slag and fly ash by how much iron and coal are produced, sulphoaluminate cements by bauxite.
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