矿渣掺量对偏高岭土基地聚物孔溶液碱度和地质聚合行为的影响  

Influence of slag content on alkalinity of pore solution and polymerization behavior of metakaolin-based geopolymer

作　　者：吕毅刚 王世玉[3,4] 戈娅萍 肖百豪 彭晖 LÜYigang;WANG Shiyu;GE Yaping;XIAO Baihao;PENG Hui(Engineering Laboratory of Bridge Structure of Hunan Province,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Safety Control of Bridge Engineering of Ministry of Education,Changsha University of Science and Technology,Changsha 410114,China;School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,China;Guangdong Hualu Communications Technology Co.Ltd.,Guangzhou 510550,China)

机构地区：[1]长沙理工大学桥梁结构安全控制湖南省工程实验室,湖南长沙410114 [2]长沙理工大学桥梁工程安全控制教育部重点实验室,湖南长沙410114 [3]长沙理工大学土木工程学院,湖南长沙410114 [4]广东华路交通科技有限公司,广东广州510550

出　　处：《中南大学学报（自然科学版）》2021年第12期4434-4442,共9页Journal of Central South University:Science and Technology

基　　金：长沙理工大学桥梁结构安全控制湖南省工程实验室开放基金资助项目(14KD13);国家自然科学基金资助项目(51878068,51578078);长沙理工大学专业学位研究生“实践创新与创业能力提升计划”资助项目(SJCX201916);湖南省杰出青年基金资助项目(2017JJ1027);湖南省教育厅科学研究创新平台开放基金资助项目(20K005)。

摘　　要：为实现废渣的资源化利用,使用矿渣替代部分偏高岭土制备地聚物混凝土。采用固液萃取法测定不同激发剂模数(M)和矿渣掺量(S)下偏高岭土基地聚物的孔溶液pH,分析激发剂模数和矿渣掺量对地聚物孔溶液碱度变化的影响机理,并通过考察矿渣/偏高岭土复合凝胶的早期放热行为以及偏高岭土的反应水平,研究矿渣对偏高岭土地质聚合行为的影响规律。研究结果表明:在激发剂质量分数为35%,激发剂模数为1.0~1.8时,固液萃取法测试得到的纯偏高岭土基地聚物孔溶液表观pH在11.75~12.05之间,其对应的真实pH超过12.75;激发剂模数降低或矿渣掺量增加,均会使地聚物孔溶液pH升高,表明降低激发剂模数以及掺入矿渣均可以提高地聚物的初始碱度,增强结构的稳定性,阻止外界物质侵蚀;矿渣能够使复合体系的碱激发反应更加有序,提高偏高岭土的整体反应水平,使微观结构更加致密。In order to realize the resource utilization of slag,slag was used instead of metakaolin to produce geopolymer concrete.The pH of pore solution of metakaolin geopolymer was determined by solid-liquid extraction method with different activator modulus(M)and slag contents(S).The mechanism of activator modulus and slag content on the alkalinity of geopolymer pore solution was analyzed.By investigating the exothermic behavior of alkali activated slag/metakaolin composite gel and the reaction level of metakaolin,the effect of slag content on the geopolymerization behavior of metakaolin was studied.The results show that the apparent pH of metakaolin-based geopolymer pore solution measured by solid-liquid extraction method is 11.75−12.05,and the corresponding real pH is over 12.75 when mass fraction of activator is 35%and activater modulus is 1.0−1.8.The pH of geopolymer pore solution increases with the decrease of activator modulus or the increase of slag content,which indicates that the reduction of activator modulus and the addition of slag can improve the initial alkalinity of geopolymer,increase the structural stability and prevent the erosion of external substances.Slag can make the reaction of the composite system more orderly,promote the reaction level of metakaolin,and make the microstructure more compactable.

关 键 词：碱度 偏高岭土 矿渣 地聚物 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]