碱渣-矿渣复合胶凝材料硬化体的微观结构与组成  

Microstructure and Composition of Hardened Paste of Soda Residue-Slag Complex Binding Materials

作　　者：刘继中 赵庆新[1] 张津瑞[2] 安赛 LIU Jizhong;ZHAO Qingxin;ZHANG Jinrui;AN Sai(Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province,Yanshan University,Qinhuangdao 066004,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;College of Urban Construction,Hebei Normal University of Science and Technology,Qinhuangdao 066004,China)

机构地区：[1]燕山大学河北省土木工程绿色建造与智能运维重点实验室,河北秦皇岛066004 [2]天津大学水利工程仿真与安全国家重点实验室,天津300072 [3]河北科技师范学院城市建设学院,河北秦皇岛066004

出　　处：《建筑材料学报》2019年第6期872-877,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51578477,51708403);中国博士后科学基金特别资助项目(2018T110200)

摘　　要：为了对工业废料—碱渣进行回收利用,研发了一种碱渣-矿渣复合胶凝材料(SSCBM).采用扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)和热重差示扫描热分析(DSC-TG)等对碱渣-矿渣复合胶凝材料28 d龄期硬化体的微观结构与组成进行了研究.结果表明:水胶比为0.5,砂胶比为3∶1,碱渣和矿渣的质量比为1∶4时,所成型的40 mm×40 mm×160 mm SSCBM试件28 d龄期抗压强度为39.6 MPa,抗折强度为8.0 MPa,氯离子化学结合率为84.4%;SSCBM体系中生成了大量尺寸为5~10μm的水化产物,且水化产物之间互相搭接形成致密的三维网状结构,其28 d龄期的水化产物主要为水化硅酸钙(C-S-H)、水化碳铝酸钙(C-A-C-H)、水化硅铝酸钙(C-A-S-H)和3CaO·Al2O3·CaCl 2·10H2O(Friedel's盐).In order to recycle soda residue,a kind of binding material from it to mix with slag was developed.Meanwhile,microstructures and compositions of hardened paste of soda residue-slag complex binding materials(SSCBM)after curing for 28 days were analyzed by means of scanning electron microscope,energy dispersive X-ray spectroscopy,X-ray diffraction and thermogravimetric-differential scanning calorimetry.The results show that when water-binder ratio is 0.5 and sand-binder ratio is 3∶1,soda residue and slag are prepared according to the mass percentage of 1∶4,the compressive strength of the SSCBM specimen(40 mm×40 mm×160 mm)is 39.6 MPa,the flexural strength is 8.0 MPa,and the chemical binding rate of chloride ions is 84.4%.A large number of hydration products between 510μm are observed in the SSCBM system;meanwhile,the hydration products are bonded to each other to form a dense three-dimensional network structure.The hydration products of binding materials after curing for 28 days are mainly C-S-H gel,C-A-C-H gel,C-A-S-H gel and 3CaO·Al2O3·CaCl2·10H2O crystal(Friedel's salt).

关 键 词：碱渣 矿渣 胶凝材料 水化产物 

分 类 号：TU526[建筑科学—建筑技术科学]