Sulphate Resistant Cement (SRC) is used when the soil or groundwater contains:
Choose the correct answer
High chloride content
High sulphate content (SO3 > 0.2%) — C3A in OPC reacts with sulphates causing expansive ettringite
Acidic water (low pH)
Saline but sulphate-free water
Correct Answer
B. High sulphate content (SO3 > 0.2%) — C3A in OPC reacts with sulphates causing expansive ettringite
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SRC (IS 12330): Has very low C3A content (< 5%) and low C3S. C3A reacts with sulphates to form ettringite (3CaO·Al2O3·3CaSO4·31H2O) causing expansive disruption. SRC resists sulphate attack. Used in: foundations in sulphate-bearing soil, marine structures, sewage pipes. IS 456 recommends SRC when SO3 > 0.2% in soil.
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