不同铁相含量高铁低钙水泥抗硫酸盐侵蚀研究  

Investigating on sulfate corrosion resistance of high-iron low-calcium cements with different iron phase contents

作　　者：张忠飞 赵艳荣[1,3,4,2] 陈平 刘荣进[1,3,4,2] 张建兵 ZHANG Zhongfei;ZHAO Yanrong;CHEN Ping;LIU Rongjin;ZHANG Jianbing(College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin 541004,China;Guangxi Nonferrous Metal Hidden Deposit Exploration and Material Development Collaborative Innovation Center,Guilin University of Technology,Guilin 541004,China;Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004 [2]桂林理工大学广西工业废渣建材资源利用工程技术研究中心,广西桂林541004 [3]桂林理工大学广西建筑新能源与节能重点实验室,广西桂林541004 [4]桂林理工大学广西有色金属隐伏矿床勘查及材料开发协同创新中心,广西桂林541004

出　　处：《混凝土》2023年第1期45-48,共4页Concrete

基　　金：国家重点研发计划课题(2019YFC1906202);广西创新驱动重大专项(2018AA23004);广西建筑新能源与节能重点实验室自主研发项目(桂科能-19-J-21-24);广西青年基金项目(2018GXNSFBA138053)。

摘　　要：为提高海洋工程基础材料水泥的抗侵蚀性能,在高铁低钙硅酸盐水泥体系中,制备不同C4AF设计含量(15%、18%、21%、24%)水泥熟料,研究水泥中不同C4AF设计含量对水泥矿物形成、工作性能、力学性能、抗硫酸盐侵蚀性能等的影响。使用XRD、SEM分析熟料的矿物形成情况及水泥水化产物形貌。研究结果表明,试验烧结制备的水泥熟料矿物组成与设计基本一致。当C4AF含量提高时,同龄期水泥的抗压强度降低,抗硫酸盐侵蚀系数先增大后减小,在C4AF含量21%时达到最大值。体系中C4AF含量高时,Fe取代部分Al形成的AFt晶粒细小,致密度高,SEM下微观表现为钙矾石形貌由粗变细,是抗硫酸盐侵蚀性能提升的主要原因。With the ultimate aim of improving the anti-corrosion performance of cement material used in marine engineering foundations,it prepared cement clinkers with different design contents of C4AF(15%,18%,21%,24%)in a high-iron low-calcium silicate cement system,and investigated the effects of different design contents of C4AF on cement mineral formation,working performance,mechanical properties,and sulfate resistance.X-ray diffraction and scanning electron microscopy(SEM)were used to analyze the mineral formation of clinker and the morphology of cement hydration products.The results showed that the mineral compositions of the cement clinkers prepared by experimental sintering were basically consistent with the design.With the increase of the C4AF content,the compressive strength of cements of the same age decreased.Meanwhile,the sulfate resistance coefficient first increased and then decreased,reaching its maximum value when the content of C4AF was 21%.As the content of C4AF increased,the ettringite grains formed by Fe and replacing part of the Al became fine and their density grew,explaining most of the observed improvement in the cement sulfate resistance.

关 键 词：高铁低钙水泥 C4AF 矿物组成 抗硫酸盐侵蚀性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]