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^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

76 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. © 2021 Elsevier Ltd

Original language	English
Article number	124880
Journal	Construction and Building Materials
Volume	306
Online published	15 Sept 2021
DOIs	https://doi.org/10.1016/j.conbuildmat.2021.124880
Publication status	Published - 1 Nov 2021
Externally published	Yes

Funding

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 ),

Research Keywords

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

RGC Funding Information

RGC-funded

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10.1016/j.conbuildmat.2021.124880

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Cite this

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title = "Roles of hybrid activators in improving the early-age properties of one-part geopolymer pastes",

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. {\textcopyright} 2021 Elsevier Ltd",

keywords = "Alkali-activated materials (AAMs), Flowability, One-part, Slump flow, Thixotropy, Workability",

author = "Yan-Shuai Wang and Yazan Alrefaei and Jian-Guo Dai",

year = "2021",

month = nov,

day = "1",

doi = "10.1016/j.conbuildmat.2021.124880",

language = "English",

volume = "306",

journal = "Construction and Building Materials",

issn = "0950-0618",

publisher = "Elsevier Ltd.",

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T1 - Roles of hybrid activators in improving the early-age properties of one-part geopolymer pastes

AU - Wang, Yan-Shuai

AU - Alrefaei, Yazan

AU - Dai, Jian-Guo

PY - 2021/11/1

Y1 - 2021/11/1

N2 - 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. © 2021 Elsevier Ltd

AB - 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. © 2021 Elsevier Ltd

KW - Alkali-activated materials (AAMs)

KW - Flowability

KW - One-part

KW - Slump flow

KW - Thixotropy

KW - Workability

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U2 - 10.1016/j.conbuildmat.2021.124880

DO - 10.1016/j.conbuildmat.2021.124880

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85114921301

SN - 0950-0618

VL - 306

JO - Construction and Building Materials

JF - Construction and Building Materials

M1 - 124880

ER -

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

Abstract

Funding

Research Keywords

RGC Funding Information

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NSFC: Research and Development on Waste Ash/Slag-based Artificial Aggregates for Applications in Concrete

Cite this

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

Abstract

Funding

Research Keywords

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Projects

NSFC: Research and Development on Waste Ash/Slag-based Artificial Aggregates for Applications in Concrete

Cite this