SiO_(2)-MgO-MgCl_(2)的微观结构与性能研究  

Investigation of the Microstructure-property Relationship of SiO_(2)-MgO-MgCl_(2)

作　　者：景杰 李虹波 郑鑫 赵锴 JING Jie;LI Hong-bo;ZHENG Xin;ZHAO Kai(Chongqing Jiaotong University,Chongqing 400714;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714;Chongqing College,University of Chinese Academy of Sciences,Chongqing 400714,China)

机构地区：[1]重庆交通大学,重庆400714 [2]重庆绿色智能技术研究院,重庆400714 [3]中国科学院大学重庆学院,重庆400714

出　　处：《广州化工》2024年第8期67-70,共4页GuangZhou Chemical Industry

摘　　要：以氯氧镁(MOC)为粘结剂,球形石英砂为骨料,在摩尔比MgO∶MgCl_(2)·6H_(2)O∶H_(2)O为7∶1∶18时,研究湿度、粘结剂含量对微观结构和性能的影响。结果表明:MOC的粘结强度贡献主要来源于5相水化物,其在5%RH中相对稳定,其中粘结剂含量为20%~30%的样品7天强度均达到了20 MPa以上。适当提高湿度有利于5相的生成,但同时生成氢氧化镁,造成样品强度和刚度损失。综合来看,SiO_(2)-MgO-MgCl_(2)材料体系拥有较优秀的早期强度和类似于天然岩石的破坏特征,可作为一种潜在的类岩石材料。The effects of humidity and binder content on microstructure and properties were investigated using magnesium oxychloride(MOC)as binder and spherical quartz sand as aggregate at a molar ratio of MgO∶MgCl_(2)∶6H_(2)O∶H_(2)O of 7∶1∶18.The results showed that the bond strength contribution of MOC mainly originated from the 5-phase hydride,which was relatively stable in 5%RH,and the 7-day strength of the samples with binder contents of 20%~30%all reached more than 20 MPa.Appropriately increasing the humidity favors the generation of 5-phase,but at the same time generates magnesium hydroxide,resulting in the loss of strength and stiffness of the samples.Taken together,the SiO_(2)-MgO-MgCl_(2) material system possesses superior early strength and damage characteristics similar to those of natural rocks,and can be used as a potential rock-like material.

关 键 词：类岩石材料 氯氧镁水泥 微观结构 抗压强度 刚度 

分 类 号：TB332[一般工业技术—材料科学与工程]