Chemistry - Complete Pblock- Question with Solution | TestHub

For a good quality cement the ratio of silica (${\mathrm{SiO}}_2$) and alumina (${\mathrm{Al}}_2{\mathrm{O}}_3$) should be between$2.5 \mathrm{to} 4.0$. Similarly, the ratio of lime ($\mathrm{CaO}$) to the total oxide mixtures consisting of${\mathrm{SiO}}_2,{\mathrm{Al}}_2{\mathrm{O}}_3$and${\mathrm{Fe}}_2{\mathrm{O}}_3$should be roughly$2:1:1$, If lime is in excess, the cement cracks during setting.