摘要
本文研究了Al_(2)O_(3)掺杂对γ-C_(2)S熟料粒径、微观结构和力学性能的影响。试验结果表明:Al_(2)O_(3)掺杂不会改变γ-C_(2)S的晶型,但显著改变了其形貌;纯相γ-C_(2)S颗粒表面褶皱较多,颗粒尺寸较大,掺杂Al_(2)O_(3)后γ-C_(2)S颗粒表面褶皱消失而变得光滑;γ-C_(2)S碳化体的抗压强度与碳化程度随着Al_(2)O_(3)掺量的提高逐渐增加。通过碳化反应温升并结合碳酸钙衍射峰的半峰宽和X射线衍射仪(XRD)定量分析表明,Al_(2)O_(3)掺杂延缓了碳化放热,有利于碳化反应的持久进行,同时促进了碳酸钙晶粒的生长和数量的增加,从而使碳化程度更高,基体结构更加密实,因而抗压强度更高。
The effect of Al_(2)O_(3) doping on the particle size,microstructure and mechanical properties of calcined γ-C_(2)S clinker was investigated.Results indicate that Al_(2)O_(3) doping has no influence on the crystal form of γ-C_(2)S,but significantly changes its morphology.The undopedγ-C_(2)S grains exhibit wrinkly surface morphology and the particle size is larger.After Al_(2)O_(3) doping,the grain surface becomes smooth.The compressive strength and the degree of carbonation of γ-C_(2)S carbonated for 24 h gradually increase with the increasing content of Al_(2)O_(3).Based on the carbonation temperature rise,full width at half maximum of the diffraction peaks of calcium carbonate and the quantitative XRD analysis,Al_(2)O_(3) doping retards the heat release of carbonation,which is beneficial for a more sustained carbonation reaction.Al_(2)O_(3) doping also promotes the growth and the number of calcium carbonate crystals,which increases the degree of carbonation,densifies the carbonated matrix and increases the compressive strength.
作者
明心昭
刘志超
王发洲
胡曙光
胡传林
MING Xinzhao;LIU Zhichao;WANG Fazhou;HU Shuguang;HU Chuanlin(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)
出处
《硅酸盐通报》
CAS
北大核心
2021年第6期2003-2010,共8页
Bulletin of the Chinese Ceramic Society
基金
国际科技合作重点项目计划(2018YFE0106300)
国家自然科学基金(51925205,U2001227,51872216)。
