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Ordinary Portland Cement



Ordinary Portland cement (simply called ordinary cement) refers to the hydraulic binding material ground by mixing Portland cement clinker 90%, 4% ~ 15% blended materials, and appropriate amount of gypsum.


OPC is a general purpose Portland cement suitable for all uses where the special properties of other types are not required. It is used where cement or concrete is not subject to specific exposures, such as sulfate attack from soil or water, or to an objectionable temperature rise due to heat generated by hydration.


Clinkers make up more than 90% of the cement, along with a limited amount of calcium sulfate (CaSO4, which controls the set time), and up to 5% minor constituents (fillers) as allowed by various standards. Clinkers are nodules (diameters, 0.2–1.0 inch 5.1–25.4 millimetres) of a sintered material that is produced when a raw mixture of predetermined composition is heated to high temperature. The key chemical reaction which defines Portland cement from other hydraulic limes occurs at these high temperatures (1,300 °C (2,370 °F)) as belite (Ca2SiO4) combines with calcium oxide (CaO) to form alite (Ca3SiO5).


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