Analysis of Chemical Composition of Portland .
During cement hydration CaO in conjunction with SiO 2, Al 2 O 3, and Fe 2 O 3 leads to hardening of Portland cement due to the formation of calcium aluminosilicates and aluminoferrite hydrate. With Portland cement, an increased presence of MgO (greater than 2%) may be detrimental to the soundness of cement, especially at late ages.
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