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).
作者
刘继中
赵庆新
张津瑞
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)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
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)
关键词
碱渣
矿渣
胶凝材料
水化产物
soda residue
slag
binding material
hydration product
作者简介
第一作者:刘继中(1991-),男,河北丰润人,燕山大学硕士生.E-mail:1693684862@qq.com;通讯作者:赵庆新(1973-),男,河北玉田人,燕山大学教授,博士生导师,博士.E-mail:zhaoqx2002@163.com。
