Effects of Foreign lons on Minerals of High Belite-Calcium Sulfoaluminate Cement

摘要

The influence of foreign ions doping on the property of belite - sulfoaluminate (BCSA) clinker with belite and calcium sulfo-aluminate as main minerals was investigated. The research on four foreign doping ions with P~(5+), B~(2+), Ba~(2+), and Zn~(2+) was carried out. The mineral components were characterized by SEM, X-ray powder diffraction and Infrared. Some foreign ions entering into the lattice of β-C_2S and C_4A_3S during sintering at high temperature attained a high reactivity. The mechanism of the effect of these ions on stabilization and activation of minerals were clarified. Results revealed that P~(5+), Ba~(2+), and Zn~(2+) could stabilize and activate β-C_2S as well as enhance reactivity ofC_4A_3S, but no positive effect of ion B~(2+) was observed. The sequence of influence of different ions on C_2S is: Ba~(2+)＞P~(5+)＞Reference>Zn~(2+)＞B~(3+), and the sequence for C_4A_3S was: P~(5+)＞ Ba~(2+)＞Zn~(2+)＞Reference ＞B~(3+). Compared to the 28-d compressive strength of reference one, P~(5+), Ba~(2+), and Zn~(2+) could enhance the strength by 15.6%, 8.9% and 26.5% respectively.