水泥种类对模型石膏性能的影响规律研究  

Effect on the Performances of Model Gypsum by Different Kinds of Cement

作　　者：赵敏 张明涛[2] 彭家惠[2] Zhao Min;Zhang Mingtao;Peng Jiahui(School of Civil and Architectural Engineering,Yangtze Normal University,Chongqing 408100;College of Materials Science and Engineering,Chongqing University,Chongqing 400045)

机构地区：[1]长江师范学院土木建筑工程学院,重庆408100 [2]重庆大学材料科学与工程学院,重庆400045

出　　处：《非金属矿》2020年第4期41-44,共4页Non-Metallic Mines

基　　金：国家自然科学基金青年科学基金项目(51902034);重庆市自然科学基金博士后科学基金项目(cstc2019jcyj-bshX0015)。

摘　　要：陶瓷注浆成型工艺中水分的溶解与泥浆电解质的化学侵蚀是导致石膏模型性能劣化的主要因素。对比研究了硅酸盐水泥(OPC)、铝酸盐水泥(AC)与硫铝酸盐水泥(SAC)对增强模型石膏力学性能、耐水与耐溶蚀性能的影响。结果表明,3种水泥均发挥有利改性作用,其增强效果按照OPC、SAC、AC顺序递增;OPC水化进程缓慢,水化7 d掺量低于12%时,硬化体早期力学强度低于纯石膏,水化后期其作用效率与SAC相当;AC改性效果最显著,水化3 d时硬化体绝干与饱水抗折强度、软化系数、耐溶蚀性能均大幅提高,增幅达26.2%、103.0%、47.2%、75.0%;复合硬化体吸水率均随水泥掺量的增加而逐渐降低。综合考虑石膏模型高吸水性能的要求,AC最佳改性掺量为8%~10%,SAC宜为12%。水化产物针棒状二水石膏晶体与细小针尖状钙矾石晶体相互交织、穿插生长,同时无定形铝凝胶密实地填充在内部孔隙中,共同形成了致密的晶胶结构,从而使模型石膏力学性能大幅提高,耐水与耐溶蚀性能显著改善。The dissolution by water and the chemical corrosion by electrolyte solution in ceramic slurry casting technology are the document factors to make the performances deterioration of gypsum model. The effect on mechanical properties, water resistance and corrosion resistance of model gypsum by OPC, AC and SAC were studied respectively. The results showed that: the three types of cement were all benificial for modification and the effect gradually increased by OPC, SAC and AC. The effect between OPC and SAC was little different. The early stage mechanical properties of composite hardening were lower than pure gypsum when the amout was under 12% due to the slow hydration process of OPC. The influences of AC was the strongest, the dry and water saturated flexural strength, water coefficient and corrosion resistance rise ratios of 3 d hardened cement were high to 26.2%, 103.0%, 47.2% and 75.0%, respectively. Meanwhile, the water absorption was declined by the improvement of mechnical performances. In view of the high water absorbing capacity, the optimum amount of AC was 8%~10%, and 12% of SAC. The pinpoint AFt and the need-rob DH crystals intergrowed to play an interconnect function between crystals. Moreover the hydration production of AH3 filled densely in the pores. Consequently, the mechnical properties, the water resistance and corrosion resistance were all significantly enhanced.

关 键 词：模型石膏 水泥 力学性能 耐水性能 耐溶蚀性能 

分 类 号：TQ172.4[化学工程—水泥工业] TU528[化学工程—硅酸盐工业]