What is the function of silica in cement?
The main mineral composition of Portland cement is: calcium silicate three, silicate two calcium, aluminum acid three calcium, iron aluminum acid four calcium. Calcium silicate three determines the strength of Portland cement within four weeks; two calcium silicate four weeks later to play the role of strength, about a year to reach three calcium silicate four weeks of play strength;
The strength of aluminum acid calcium three play faster, but the intensity is low, its important role in Portland cement in 1 to 3 days or slightly long time strength; ferritealuminate four calcium intensity is also faster, but low strength, the strength of Portland cement with small.
The main raw material of cement is calcium carbonate and silica, after calcination to form calcium silicate.
