The strength of the cement clinker compounds that are based on the C3S and C2S majority. The most existing C3S in cement is 45-55 percent. Occurs at high temperature (1,450 C), causing a large amount of CO2 emissions. As a result, people interested in education. Synthesis C2S a lot. Which is available in 35 and 15 percent of cement occur at temperatures below C3S.