关键词: γ-C2S;β-C2S;碳化反应;水化活性

Abstract: γ-C2 S basically have slow hydration activity , but β-C2 S have relatively high hydration activity at room temperature and atmosphere pressure .Both γ-C2 S and β-C2 S are carbonated under certain humidity and concentration of CO 2 .γ-C2 S and β-C2 S with Similar specific surface area are prepared at laboratory .The hydration activity at different temperatures and carbonation reaction at room temperature and atmosphere pressure of γ-C2 S and β-C2 S are studied by SEM、XRD、TG-DSC, content of free lime and ignition loss .The results show that main carbonation products of γ-C2 S and β-C2 S are calcite and small amounts of vaterite.Small amounts of aragonite are also produced after γ-C2S's carbonation. Carbonation activity of γ-C2 S are slightly higher .The hydration activity of γ-C2 S is much more slowly than β-C2 S's at 140 ℃, the hydration activity of γ-C2 S will be greatly improved when the temperature rises to 200 ℃, and the difference of hydration rate became much smaller .

Key words: γ-C2 S;β-C2 S;carbonation;hydration