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    KnowledgeGlossaryOPC (Ordinary Portland Cement)
    Aggregates & Materials

    OPC (Ordinary Portland Cement)

    // Definition

    The most common type of cement, manufactured by grinding clinker with gypsum. Available in three grades in India: 33, 43, and 53 (compressive strength in MPa at 28 days).

    OPC 53 is widely used in RMC for its high early strength. OPC 43 is used in general construction. OPC 33 is largely phased out.\n\nOPC produces more heat and shrinkage than blended cements. For mass or durability-critical work, PPC or PSC is often preferred.

    // Related Indian Standards
    IS 269IS 8112IS 12269
    // Cross-references
    Cement Hydration

    The chemical reaction between cement and water that produces hardened cementitious paste. Hydration generates heat and the binding C-S-H gel that gives concrete its strength.

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