{"title":"Chemical deformation and mass change of metakaolin-based geopolymer grouting material in sulfate environment","authors":"Leping Liu, H. Liu, Yue Xu, Maojia Xie, Yan He","doi":"10.1680/jadcr.21.00090","DOIUrl":null,"url":null,"abstract":"In this study, metakaolin and waterglass with a modulus of 1.3 were mixed to prepare metakaolin based geopolymer grouting materials (MKGPGM) with different alkalinity of 11 wt%, 12 wt%, and 13 wt% The linear expansion, mass change, mechanical properties and microstructure of the specimens were investigated after being immersed in pure water and sodium sulfate solutions with a concentration of 1-4 wt% for 90 days. The results indicate that the main gel products were sodium silicoaluminate hydrate (N-A-S-H) gel, gypsum and ettringite were not detected in the specimens. The MKGPGM samples showed slight expansion first and then followed by a micro-shrinkage. When the mass concentration of Na2O is 12 wt%, the maximum expansion rate was less than 0.12%. MKGPGM samples showed a small increase in mass, essentially unchanged compressive strength and good anti- sulfate corrosion performance.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":" ","pages":""},"PeriodicalIF":1.4000,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advances in Cement Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1680/jadcr.21.00090","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 1
Abstract
In this study, metakaolin and waterglass with a modulus of 1.3 were mixed to prepare metakaolin based geopolymer grouting materials (MKGPGM) with different alkalinity of 11 wt%, 12 wt%, and 13 wt% The linear expansion, mass change, mechanical properties and microstructure of the specimens were investigated after being immersed in pure water and sodium sulfate solutions with a concentration of 1-4 wt% for 90 days. The results indicate that the main gel products were sodium silicoaluminate hydrate (N-A-S-H) gel, gypsum and ettringite were not detected in the specimens. The MKGPGM samples showed slight expansion first and then followed by a micro-shrinkage. When the mass concentration of Na2O is 12 wt%, the maximum expansion rate was less than 0.12%. MKGPGM samples showed a small increase in mass, essentially unchanged compressive strength and good anti- sulfate corrosion performance.
期刊介绍:
Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.