Effect of mixing method on the performance of alkali-activated fly ash/slag pastes along with polycarboxylate admixture

Yazan Alrefaei; Yan Shuai Wang; Jian Guo Dai

doi:10.1016/j.cemconcomp.2020.103917

Effect of mixing method on the performance of alkali-activated fly ash/slag pastes along with polycarboxylate admixture

Yazan Alrefaei, Yan Shuai Wang, Jian Guo Dai

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

53 Citations (Scopus)

Abstract

The addition sequence of raw materials during mixing is one factor that affects the fresh and hardened properties of ordinary Portland cement (OPC). Similar to OPC, the properties of alkali-activated materials (AAMs) may be susceptible to the mixing procedure, yet the mixing procedure's effect is still unclear. This research aims to investigate how different mixing procedures affect the fresh and hardened properties of the Na₂SiO₃-anhydrous alkali-activated materials along with polycarboxylate superplasticizer. Besides, a new mixing method named “hybrid-mixing” is proposed, evaluated, and compared with the conventional one-part (1 GP) and two-part (2 GP) mixing methods. It was found that the mixing procedure markedly affects the fresh and hardened properties of AAMs without changing their chemical composition. Compared with 1 GP and 2 GP binders, the hybrid-mixed binders achieved a relatively better slump-flow and compressive strength. The mechanisms governing different mixing methods are further discussed.

Original language	English
Article number	103917
Journal	Cement and Concrete Composites
Volume	117
DOIs	https://doi.org/10.1016/j.cemconcomp.2020.103917
Publication status	Published - Mar 2021

Keywords

Admixtures
Alkali-activated materials (AAMs)
Alkaline activator
Mechanical properties
Slump flow
Workability

ASJC Scopus subject areas

Building and Construction
General Materials Science

More information

10.1016/j.cemconcomp.2020.103917

Cite this

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title = "Effect of mixing method on the performance of alkali-activated fly ash/slag pastes along with polycarboxylate admixture",

abstract = "The addition sequence of raw materials during mixing is one factor that affects the fresh and hardened properties of ordinary Portland cement (OPC). Similar to OPC, the properties of alkali-activated materials (AAMs) may be susceptible to the mixing procedure, yet the mixing procedure's effect is still unclear. This research aims to investigate how different mixing procedures affect the fresh and hardened properties of the Na2SiO3-anhydrous alkali-activated materials along with polycarboxylate superplasticizer. Besides, a new mixing method named “hybrid-mixing” is proposed, evaluated, and compared with the conventional one-part (1 GP) and two-part (2 GP) mixing methods. It was found that the mixing procedure markedly affects the fresh and hardened properties of AAMs without changing their chemical composition. Compared with 1 GP and 2 GP binders, the hybrid-mixed binders achieved a relatively better slump-flow and compressive strength. The mechanisms governing different mixing methods are further discussed.",

keywords = "Admixtures, Alkali-activated materials (AAMs), Alkaline activator, Mechanical properties, Slump flow, Workability",

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

note = "Funding Information: The first author would like to sincerely thank the Hong Kong Ph.D. Fellowship Scheme (HKPFS) offered by the Research Grants Council (RGC) of Hong Kong for sponsoring his Ph.D. study. The authors would like to acknowledge the financial support received from the Hong Kong-Guangzhou Technology and Innovation Partnership Program (Project No. 201807010055 ), National Science Foundation of China (NSFC) (Project No. 51638008 ), and Hong Kong General Research Fund (Project code: 15223120 ). Special thanks to Ms. Eun Shim for her contribution during the experimental work and Mr. King Hee Wong and Ms. Dorothy Chan for conducting the MIP tests. The contribution of Dr. Xiao Xue and Dr. Ning Tang in the analysis of FTIR results is acknowledged. The authors would like to deliver their grateful thanks to the anonymous reviewers and the editor, whose comments helped enhance this paper considerably. Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2021",

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doi = "10.1016/j.cemconcomp.2020.103917",

language = "English",

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journal = "Cement and Concrete Composites",

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AU - Alrefaei, Yazan

AU - Wang, Yan Shuai

AU - Dai, Jian Guo

N1 - Funding Information: The first author would like to sincerely thank the Hong Kong Ph.D. Fellowship Scheme (HKPFS) offered by the Research Grants Council (RGC) of Hong Kong for sponsoring his Ph.D. study. The authors would like to acknowledge the financial support received from the Hong Kong-Guangzhou Technology and Innovation Partnership Program (Project No. 201807010055 ), National Science Foundation of China (NSFC) (Project No. 51638008 ), and Hong Kong General Research Fund (Project code: 15223120 ). Special thanks to Ms. Eun Shim for her contribution during the experimental work and Mr. King Hee Wong and Ms. Dorothy Chan for conducting the MIP tests. The contribution of Dr. Xiao Xue and Dr. Ning Tang in the analysis of FTIR results is acknowledged. The authors would like to deliver their grateful thanks to the anonymous reviewers and the editor, whose comments helped enhance this paper considerably. Publisher Copyright: © 2021 Elsevier Ltd Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2021/3

Y1 - 2021/3

N2 - The addition sequence of raw materials during mixing is one factor that affects the fresh and hardened properties of ordinary Portland cement (OPC). Similar to OPC, the properties of alkali-activated materials (AAMs) may be susceptible to the mixing procedure, yet the mixing procedure's effect is still unclear. This research aims to investigate how different mixing procedures affect the fresh and hardened properties of the Na2SiO3-anhydrous alkali-activated materials along with polycarboxylate superplasticizer. Besides, a new mixing method named “hybrid-mixing” is proposed, evaluated, and compared with the conventional one-part (1 GP) and two-part (2 GP) mixing methods. It was found that the mixing procedure markedly affects the fresh and hardened properties of AAMs without changing their chemical composition. Compared with 1 GP and 2 GP binders, the hybrid-mixed binders achieved a relatively better slump-flow and compressive strength. The mechanisms governing different mixing methods are further discussed.

AB - The addition sequence of raw materials during mixing is one factor that affects the fresh and hardened properties of ordinary Portland cement (OPC). Similar to OPC, the properties of alkali-activated materials (AAMs) may be susceptible to the mixing procedure, yet the mixing procedure's effect is still unclear. This research aims to investigate how different mixing procedures affect the fresh and hardened properties of the Na2SiO3-anhydrous alkali-activated materials along with polycarboxylate superplasticizer. Besides, a new mixing method named “hybrid-mixing” is proposed, evaluated, and compared with the conventional one-part (1 GP) and two-part (2 GP) mixing methods. It was found that the mixing procedure markedly affects the fresh and hardened properties of AAMs without changing their chemical composition. Compared with 1 GP and 2 GP binders, the hybrid-mixed binders achieved a relatively better slump-flow and compressive strength. The mechanisms governing different mixing methods are further discussed.

KW - Admixtures

KW - Alkali-activated materials (AAMs)

KW - Alkaline activator

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KW - Workability

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VL - 117

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Effect of mixing method on the performance of alkali-activated fly ash/slag pastes along with polycarboxylate admixture

Abstract

Keywords

ASJC Scopus subject areas

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