In cement theoretical, the strength development of the clinker compounds are mainly based on 2 compounds; Tricalcium silicate (Ca3SiO5, C3S) and Dicalcium silicate (Ca2SiO4, C2S). The most existing C3S in clinker is 45-55 %, is which occurs at high temperature (1,450 °C ). For C2S occurs at lower temperature than C3S and it emissions of CO2 less than C3S. As a result, people interested in education to synthesis C2S.