- Self-healing concrete
- 조회수 : 125 작성일 : 2018.09.13
A characteristic of Portland cement is its high content of calcium oxide (CaO). In nearly every case this CaO originated as calcium carbonate (CaCO3) in limestone. The process of producing clinker involves heating the limestone in the presence of other materials containing silica (SiO2), iron oxide (Fe2O3) and alumina (Al2O3) so that the CaCO3 loses the CO2 part of its constitution and the remaining CaO combines with the other oxides to form the compounds we know in clinker as alite (tricalcium silicate), belite (dicalcium silicate), aluminate (tricalcium aluminate) and ferrite (tetracalcium alumino-ferrite) phases. The exact stoichiometry of these phases varies, sometimes quite appreciably, from the chemical analyses implied by the names in brackets.