Discussion
A sulphate resisting cement is made by limiting the content of
Answer: A
Correct answer: tricalcium aluminate
Sulphate attack works by sulphate reacting with the hydrated aluminate to form ettringite, which occupies a greater volume and disrupts the hardened paste. Limiting the tricalcium aluminate content, typically to five per cent or less, removes most of what the sulphate has to attack. The silicates are unaffected, so the cement retains its strength.
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