聚合硫酸铝改性低碱度水泥性能研究  

Properties of Polyaluminum Sulfate-Modified Low-Alkalinity Cement

作　　者：韦琦 刘艳[3] 耿海宁[4] 马浩森 陈伟[1] 王东文[3] 潘社奇[3] 李秋[1] WEI Qi;LIU Yan;GENG Haining;MA Haosen;CHEN Wei;WANG Dongwen;PAN Sheqi;LI Qiu(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Institute of Materials,China Academy of Engineering Physics,Mianyang 621907,China;Hubei Urban Construction Vocational and Technological College,Wuhan 430205,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]中国工程物理研究院材料研究所,绵阳621907 [4]湖北城市建设职业技术学院,武汉430205

出　　处：《硅酸盐通报》2022年第4期1237-1244,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52072279);中国工程物理研究院横向科研项目;硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2021-12);湖北省重点研发计划项目(2020BAB065);湖北省自然科学基金青年项目(ZRMS2020001673);深圳市科技计划项目协同创新专项(CJGJZD20200617102601003)。

摘　　要：以水泥、硅灰和粉煤灰为主要胶凝材料制备的低碱度水泥可应用于放射性焚烧灰的固化,但其存在早期强度发展慢、后期强度不高的问题。本文以聚合硫酸铝作为添加剂激发火山灰材料反应活性,通过测定不同掺量聚合硫酸铝加入后固化体的抗压强度、孔隙率及pH值变化,并结合水化产物组成与含量、水化放热特性等表征手段,分析了聚合硫酸铝对低碱度水泥早期水化过程的影响规律和作用机理。结果表明:掺入聚合硫酸铝可以显著提高低碱度水泥固化体的早期抗压强度,使水化放热峰提前,促进了火山灰反应的发生,提高了水化产物的生成量,使微观结构更加密实,同时有效降低试样的早期碱度,有利于抑制焚烧灰中活性铝的腐蚀反应。The compressive strength at early and late age is relatively low for low-alkalinity cement prepared by ordinary Portland cement, silica fume and fly ash for the solidification of radioactive incineration ash. In this study, polyaluminum sulfate was used as additive to stimulate the reactivity of pozzolanic materials in the low-alkalinity cement. The effect and mechanism of polyaluminum sulfate on the early age hydration of low-alkalinity cement were characterized by evaluating the compressive strength, porosity, pH value, phase assemblage and microstructure of low-alkalinity cement after addition of polyaluminum sulfate. The results indicate that the incorporation of polyaluminum sulfate significantly improves the early age compressive strength of the low-alkalinity cement. The exothermic peak of early age hydration is advanced and the pozzolanic reaction is promoted. The amount of hydration products increases, and the microstructure is densified. The early age alkalinity effectively reduces, which is beneficial to inhibit the corrosion reaction of metal aluminum in the incineration ash waste form.

关 键 词：低碱度水泥 聚合硫酸铝 火山灰反应 水化产物 微观结构 碱度 

分 类 号：TL941[核科学技术—辐射防护及环境保护]