Question

Reducing the C3A content of portland cement contributes to improved resistance to: sulfate attack alkali-silica reaction corr

I thought the answer to this question was, "corrosion of reinforcing steel" however that was incorrect. Could you please tell me the correct answer, and explain why that is the right answer. Thank you

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Answer #1

Solution A is correct

the C3A is linked to sulphate attack resistance when the sulphate is coming from the environment. Briefly, the hydration of C3A, together with added gypsum to cement, provide ettringite formation, which later becomes a monosulfate. The monosulfate, when in contact with the sulfate that came from the external environment became unstable and reacts back to ettringite in a strongly expansive reaction. This, occurring in the hardened concrete, produce intense material degradation. Thus, it is important to limit the C3A content of cements for the production of concrete that will be applied in environments rich in sulfate.

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