Binder-scale creep behavior of metakaolin-based geopolymer. (October 2019)

• Record Type: Journal Article
• Authors: Chen, Shikun; Wu, Chenglin; Yan, Dongming
• Is Part Of: Cement and concrete research. Volume 124(2019)
• Publication Date: 2019-10
• Subjects: Geopolymer -- Creep -- Nanoindentation; Cement -- Periodicals; Cement -- Research -- Periodicals; Concrete -- Periodicals; Concrete -- Research -- Periodicals; Ciment -- Périodiques; Béton -- Périodiques; Cement; Concrete; Periodicals; 620.135
• DOI: 10.1016/j.cemconres.2019.105810
• Languages: English
• ISSNs: 0008-8846

Abstract

Abstract: In this study, the creep behavior of binder phase in metakaolin-based geopolymers (MKGs) was investigated using nanoindentation. The underlying influence of the Si/Al ratio on the creep behavior was determined from detailed microstructure characterization and micromechanical analysis. The results indicated a strong correlation between the binder-scale creep behavior in MKG and its microstructure, particularly the characteristic pore size, which was further related to the Si/Al ratios of the binder. Combined with micromechanical analysis, the underlying influence of the composition and structure on the creep behavior in MKG was further explained. Graphical abstract: Unlabelled Image Highlights: Binder-scale indentation shows the creep/elastic behavior of metakaolin-based geopolymer (MKG) vary with its Si/Al ratio. The influences of Si/Al ratio on creep/elastic properties are attributed to the changes of pore structure of the binder. Micromechanics analysis indicates a surface layer may account for the pore-size effect in creep/elastic behavior of MKG.