高硅石灰石对贝利特硫铝酸钡钙水泥的影响机理

Influence Mechanism of High-Silicon Limestone on Belite-Barium Calcium Sulphoaluminate Cement

通过热分析、显微镜观察、X射线衍射分析和扫描电子显微镜-能谱仪测试,研究了高硅石灰石对贝利特-硫铝酸钡钙水泥熟料矿物结构和性能的影响.结果表明:高硅石灰石的分解温度低,少量掺入可以促进C3S晶体发育,提高水泥熟料质量;高硅石灰石带入的α-石英阻碍了C3S矿物的形成和发育,但高硅石灰石带入的菱镁矿和白云石能够改善水泥熟料液相性质,促进C3S矿物在低温下形成.当高硅石灰石与普通石灰石质量比为1.0︰5.0时,所制备的贝利特-硫铝酸钡钙水泥的3,7,28d抗压强度分别为37.9,60.3,87.9MPa,展现出了良好的力学性能.

The influence of high-silicon limestone on mineral structure and performance of belite-barium calcium sulphoaluminate cement clinker were investigated by thermal analysis, petrographic analysis, X- ray diffraction and scanning electron microscopy-energy dispersive spectroscopy. The results show that high-silicon limestone has low decomposition temperature, which can promote the development of C3S by adding small quantity. The formation and development of C3 S is hindered by a-quartz while C3 S is formed easily by mixing magnesite and dolomite in high-silicon limestone at low temperature. When mass propor- tions of high-silicon limestone and ordinary limestone is 1.0： 5.0, the compressive strength of this cement at 3, 7, 28 d is 37.9, 60.3, 87.9 MPa respectively, which shows excellent improvement of mechanical properties.