What is blended hydraulic cement?

Blended hydraulic cement is produced by blending Portland cement and other cementitious materials like, slag, fly ash, silica fume, clay, hydrated lime and other pozzolans, to produce a performance cement meeting ASTM C595 or C1157. The use of hydraulic cement in ready-mix concrete reduces mixing water and bleeding, improves workability and finishing, inhibits sulfate attack and the alkaline aggregate reaction, and reduces the heat of hydration.

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