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• 01:26, 4 December 2024 Admin talk contribs created page Cement (Created page with "==Types== Cement normally consists of a 30:20:1 ratio of calcium oxide, silicon dioxide, and gypsum. Some aluminum oxide can be substituted for silicon dioxide. ===Portland Cement=== {| class=wikitable !C3S / Alite |50% | {{#Chem: 3CaO*SiO2}} | C3S + 6H = C-S-H + 3CH<br> '''Alite''' + 6 Water = '''C-S-H''' + 3 Portlandite<br> {{#Chem: 2(CaO)3SiO2 + 6H2O = (CaO)3(SiO)2(OH)3 + 3Ca(OH)2 dH=-173.6}} | +120cal/g |very reactive compound, high heat of hydration, h...")