The four main compounds of OPC clinker and their contributions are:
Choose the correct answer
Only CaO and SiO2
C3S, C2S, C3A, C4AF — each with different rate of hydration and heat generation
Only C3S and C3A
Quartz, feldspar, mica, calcite
Correct Answer
B. C3S, C2S, C3A, C4AF — each with different rate of hydration and heat generation
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OPC compounds: C3S (alite) → early strength + heat; C2S (belite) → late strength + low heat; C3A → very early set + high heat (causes sulfate attack, controlled by gypsum); C4AF → contributes little strength, grey colour. Gypsum is added to retard C3A and control setting time.
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