珊瑚砂浆的力学性能与微观结构特征

及界面过渡区的微观结构，提高珊瑚砂浆的力学性能，使其28 d珊瑚砂凹凸不平的表面能与硬化水泥浆体形成紧密的啮合状态，有助于提高砂浆的体积稳
定性；珊瑚砂的内养护作用使砂浆的力学性能和抵抗收缩能力得到了提高；粉煤灰和矿粉的微集
料填充作用和火山灰效应，提高了珊瑚砂浆的力学性能和抗氯离子扩散能力；珊瑚砂持续释放出
Abstract: Compared w让h standard sand mortar, the physical and mechanical properties o£ coral sand mortar(coral mortar, for short), and the effects of mineral admixtures on the coral mortar were investigated. Scanning electron microscope and energy dispersive X-ray spectrometer (SEM-EDS), X-ray diffraction (XRD) and Fourier transform infrared spectrometer(FTIR) were used to explore the microscopic mecha­ nism involved in the mechanical properties, volume stability and hydration of mortar. It is showed that mechanical strength of the coral mortar is lower than that of the standard sand mortar, and the microstruc­ ture of cement mortar and interface transition area are improved by the mineral admixture, also the me­ chanical strength of coral mortar is improved and its 28 d compressive strength is increased by 2. 1% as compared to the control. The uneven surface of coral sand can form a tight meshing state with hardened cement mortar, which is helpful to improve the volume stability of mortar. The internal curing effect of coral sand improves the mechanical properties and resistance to shrinkage of the mortar. Furthermore, mi-
的C『+、M『+参与了水泥的水化反应，有助于生成更多的水化产物.
关键词：珊瑚砂；力学性能；体积稳定性；微观结构；氯离子
中图分类号:TU521. 1
文献标志码：A
doi：10. 3969/j. issn. 1007-9629. 2020. 02. 004
Mechanical Properties and Microstructural Characteristics of Coral Sand Mortar
摘要：研究了珊瑚砂-水泥砂浆(珊瑚砂浆)的力学性能，以及复合矿物掺和料对珊瑚砂浆的改性作
用，并与标准砂浆进行对比.采用扫描电子显微镜-能量弥散X射线谱(SEM-EDS)、X射线衍射
(XRD)和傅里叶变换红外光谱(FTIR),对砂浆力学性能、体积稳定性和水化作用的微观机理进行
了研究.结果表明：珊瑚砂浆的力学强度低于标准砂浆，加入复合矿物掺和料后可改善水泥石基体
珊瑚砂浆的力学强度低于标准砂浆加入复合矿物掺和料后可改善水泥石基体及界面过渡区的微观结构提高珊瑚砂浆的力学性能使其28d抗压強度较标准砂浆提高了2
第23卷第2期 2020年4月
建筑材料学报
JOURNAL OF BUILDING MATERIALS
文章编号：1007-9629(2020)02-0263-08
珊瑚砂浆的力学性能与微观结构特征
Vol. 23,No. 2 Apr. ,2020
梅军帅⑺，吴 静"，王罗新"，梅军鹏3, 丁庆军彳
(1.武汉纺织大学材料科学与工程学院，湖北武汉430200； 2.武汉纺织大学纺织纤维及制品教育部重点实验室，湖北武汉430200；
3.武汉理工大学硅酸盐建筑材料国家重点实验室 ，湖北武汉430070)
收稿日期:2018-11-24 f修订日期：2019-03-04 基金项目：“十三五"国家重点研发计划项目(2017YFB0310100)；湖北省重大专项研发计划(2018AAA001)；固废资源化利用与节能建材 国家重点实验室开放基金资助项目(SWR-2016-002) 第一作者：梅军帅(1991—),男，河南潔河人，武汉纺织大学硕士生.E-mail：13183204638@163. com 通讯作者:吴 静(1981—),女，内蒙古集宁人,武汉纺织大学副教授，博士.E-mail： wujing313@
MEI Junshuai1'2 , WU Jing12 , WANG Luoxin12, MEI Junpeng3 , DING Qingjun3
(1.College of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, China: 2.Key Laboratory of Textile Fiber and Products(Mnistry of Education), Wuhan Textile University, Wuhan 430200, China; 3. State Key Laboratory for Silicate Building Materials, Wuhan University of Technology, Wuhan 430070, China)