Roles of hybrid activators in improving the early-age properties of one-part geopolymer pastes

Yan Shuai Wang; Yazan Alrefaei; Jian Guo Dai

doi:10.1016/j.conbuildmat.2021.124880

Roles of hybrid activators in improving the early-age properties of one-part geopolymer pastes

Yan Shuai Wang, Yazan Alrefaei, Jian Guo Dai

Research output: Journal article publication › Journal article › Academic research › peer-review

53 Citations (Scopus)

Abstract

The simple operation of one-part geopolymer has shown promising practicability for future in-situ construction similar to ordinary Portland cement. Intending to meet the demand of various industrial applications such as 3D printing, this study aims to tailor the early-age properties of one-part fly ash/ground granulated blast-furnace slag (FA/GGBS) geopolymer through the utilization of hybrid activators, such as anhydrous sodium metasilicate (Na₂SiO₃), sodium carbonate (Na₂CO₃), and sodium aluminate (NaAlO₂). The reaction kinetics and chemistries of such alkali activators are expounded to understand the working principles and their contribution to the performance improvement of one-part geopolymer. The experimental results indicated that Na₂SiO₃-activated one-part geopolymer released high reaction heat and achieved a faster setting. Such shortcomings could be improved by partial replacement of Na₂SiO₃ with Na₂CO₃ in a solid form. Besides, the incorporation of slight NaAlO₂ decreased the self-flow of geopolymer paste, whereas the slump-flow properties remained unchanged.

Original language	English
Article number	124880
Journal	Construction and Building Materials
Volume	306
DOIs	https://doi.org/10.1016/j.conbuildmat.2021.124880
Publication status	Published - 1 Nov 2021

Keywords

Alkali-activated materials (AAMs)
Flowability
One-part
Slump flow
Thixotropy
Workability

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

More information

10.1016/j.conbuildmat.2021.124880

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abstract = "The simple operation of one-part geopolymer has shown promising practicability for future in-situ construction similar to ordinary Portland cement. Intending to meet the demand of various industrial applications such as 3D printing, this study aims to tailor the early-age properties of one-part fly ash/ground granulated blast-furnace slag (FA/GGBS) geopolymer through the utilization of hybrid activators, such as anhydrous sodium metasilicate (Na2SiO3), sodium carbonate (Na2CO3), and sodium aluminate (NaAlO2). The reaction kinetics and chemistries of such alkali activators are expounded to understand the working principles and their contribution to the performance improvement of one-part geopolymer. The experimental results indicated that Na2SiO3-activated one-part geopolymer released high reaction heat and achieved a faster setting. Such shortcomings could be improved by partial replacement of Na2SiO3 with Na2CO3 in a solid form. Besides, the incorporation of slight NaAlO2 decreased the self-flow of geopolymer paste, whereas the slump-flow properties remained unchanged.",

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note = "Funding Information: The authors would like to acknowledge the financial support received from the Hong Kong-Guangzhou Technology and Innovation Partnership Program (Project No. 201807010055 ), Hong Kong RGC General Research Fund (Project No. 15219919 ), NSFC/RGC Joint Research Scheme ( N_PolyU542/20 ), and the National Natural Science Foundation of China (NSFC) Key Project (Project Code: 51638008 ), Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

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Roles of hybrid activators in improving the early-age properties of one-part geopolymer pastes

Abstract

Keywords

ASJC Scopus subject areas

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