氧化石墨烯增强地聚物抗硫酸盐侵蚀性能研究  

Sulfate Attack Resistance of Graphene Oxide Reinforced Geopolymer

作　　者：樊晋源 李茂森 段平 陈伟[2] 张祖华 FAN Jinyuan;LI Maosen;DUAN Ping;CHEN Wei;ZHANG Zuhua(Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,School of Materials Science and Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]中国地质大学(武汉)材料与化学学院,武汉430074 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [3]同济大学材料科学与工程学院先进土木工程材料教育部重点实验室,上海201804

出　　处：《材料导报》2023年第13期237-241,共5页Materials Reports

基　　金：湖北省重点研发计划(2020BAB065);江西省重点研发计划(20201BBG71011)。

摘　　要：为研究氧化石墨烯对地聚物耐久性的影响,以偏高岭土(MK)、氧化石墨烯(GO)为原料,通过碱激发方式制备地聚物。采用抗压强度测试、扫描电子显微镜(SEM)、X射线衍射(XRD)、红外光谱(FTIR)等综合分析经硫酸盐溶液侵蚀后GO增强地聚物的力学性能及微观结构以评价其耐久性能。结果表明:GO的掺入可提高地聚物的抗压强度。当GO掺入量为0.1%(质量分数)时,GO增强地聚物的抗压强度最高,硫酸盐侵蚀7 d后达到73.07 MPa。GO的掺入可增加地聚物致密性,有效减少有害物质侵入,提高地聚物的早期抗硫酸盐侵蚀性能,侵蚀7~14 d抗压强度仅减少5.5%;GO加快地聚合反应及水化速率,促进地聚物凝胶中钠长石和钠沸石等成核结晶生长。This work aims to investigate the effect of graphene oxide(GO)on the sulfate attack of geopolymers.Geopolymers were prepared from metakaolin(MK)and graphene oxide(GO)by alkali activation.Mechanical property and microstructure of the GO-reinforced geopolymers after sulfate attack were analyzed by using compressive strength test,scanning electron microscopy(SEM),X-ray diffraction analysis(XRD),and infrared spectroscopy analysis(FTIR)to evaluate its durability.The results show that GO improves compressive strength.The sample with 0.1wt%of GO exhibits the highest compressive strength,which reaches 73.07 MPa at 7 d of sulfate exposure.GO increases the compactness of geopolymers,effectively reduces the ingress of harmful substances,and improves early-age sulfate attack resistance.The compressive strength of the sample with 7—14 d of sulfate exposure decreases by only 5.5%.GO accelerates geopolymerization process and hydration rate,and promotes nucleation crystallization of albite and flusston in geopolymer gel.

关 键 词：地聚物 偏高岭土(MK) 氧化石墨烯(GO) 硫酸盐侵蚀 微观结构 

分 类 号：TB332[一般工业技术—材料科学与工程]