Self-compensating geopolymer utilizing nano-clay and chopped basalt fibers. (28th November 2022)

• Record Type: Journal Article
• Authors: Li, Jingyao; Si, Jiwen; Luo, Feng; Zuo, Chuanxiao; Zhang, Peiping; Sun, Yanbin; Li, Wenqing; Miao, Shiding
• Is Part Of: Construction & building materials. Volume 357(2022)
• Publication Date: 2022-11-28
• Subjects: SL slag -- FA fly ash -- LP laponite -- GM geopolymer mortar -- Ht hydrotalcite -- PVA polyvinyl alcohol -- FBF "flexible" basalt fibers -- PBF pristine basalt fibers -- NBF none basalt fibers -- C-S-H Calcium-Silicate-Hydrate; Self-compensating -- Composite Geopolymer -- Shrinkage -- Basalt fiber -- Laponite -- Hydrotalcite-like phase; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.129302
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstract: Highlights: Self-compensating geopolymer was developed by using laponite and basalt fibers. The flexible basalt fibers was prepared via one-step drawing with PVA lubircation. The improved roughness and enhanced resistance to alkalis was obtained. Mechanism was found as hydrotalcite-like species formed in the geopolymer. Abstract: To eliminate the drying shrinkage as well as improve toughness of alkali activated geopolymer, the nano-sized laponite and chopped basalt fibers were utilized as additives to prepare self-compensating reinforced geopolymer. The magnesium-silicate laponite featured with gelable properties was found to influence geopolymerization in the slag/fly ash-based alkali system. This was validated by the new formation of hydration products as hydrotalcite-like phase (Ht). The release of Mg 2+ under activation promoted the participation of Al from the starting materials (slag and fly ash). Near-zero shrinkage was obtained at the dosage of laponite 4.0–5.0 wt% in the slag/fly ash-based geopolymetric mortars. The composite mortars exhibited excellent tensile-bond strength up to 5.7 MPa, and the low numbers pores of per unit area was achieved compared to other literatures. The flexural strength was improved by 51 % when the geopolymer was incorporated with flexible basalt fibers as modified with polyvinyl alcohol at dosage of 4.0 vol%.