| Identification | Back Directory | [Name]
dicalcium silicate | [CAS]
10034-77-2 | [Synonyms]
dicalcium silicate
Silicic acid (H4SiO4), calcium salt (1:2) | [EINECS(EC#)]
233-107-8 | [Molecular Formula]
Ca2O6Si2 | [MDL Number]
MFCD03701475 | [MOL File]
10034-77-2.mol | [Molecular Weight]
232.323 |
| Hazard Information | Back Directory | [Chemical Properties]
Dicalcium silicate crystallizes in four polymorphic modifications which are known under the designations α, α', β, and γ. The β modification is metastable at all temperatures. It is converted to the less dense γ modification at below 500 ℃. This conversion is the reason why a cement clinker rich in C2S may disintegrate at low cooling rates. In industrial clinkers, however, burnt above 1200 ℃, disintegration generally does not take place because the different high temperature modifications of C2S are stabilized by incorporation of, e.g., Al3+, Mg2+, P3+, Na+, K+ etc. The type of modification present in industrial clinkers additionally depends on the cooling rate. Commonly, C2S exists in its β modification besides the α and α' modifications. | [General Description]
Dicalcium silicate occurs when cement clinker is not completely saturated with calcium oxide. Pure dicalcium silicate melts congruently at 2130 ℃. In lime-rich raw mixes, C2S forms already at temperatures below 1000 ℃ by solid-state reaction. During the sintering process in the presence of a melt above 1250 ℃, C2S incorporates additional Ca2+, resulting in the formation of C3S. |
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Rhawn Reagent
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