Effects of delayed addition of polycarboxylate ether on one-part alkali-activated fly ash/slag pastes: Adsorption, reaction kinetics, and rheology

Yazan Alrefaei; Jian Guo Dai

doi:10.1016/j.conbuildmat.2022.126611

Effects of delayed addition of polycarboxylate ether on one-part alkali-activated fly ash/slag pastes: Adsorption, reaction kinetics, and rheology

Yazan Alrefaei, Jian Guo Dai

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

19 Citations (Scopus)

Abstract

The admixture addition method is one of the vital factors influencing the fresh performance of ordinary Portland cement (OPC) through directly affecting the adsorption, hydration, and rheology. However, such an issue is less researched in the one-part alkali-activated materials (AAMs), which have great potentials in the industry due to their simple operation, similar to OPC. This study reports and discusses the effects of delayed polycarboxylate ether (PCE) addition at different contents on adsorption, reaction kinetics, and rheology of one-part AAMs. It is found that the delayed PCE addition had minimized the competitive adsorption phenomenon and reduced the consumption rate of PCE surfactants, which in turn facilitates easier adsorption of silicate species onto the GGBS grains. This had decreased the retardation effect of PCE, slightly improved the compressive strength, and lowered the viscosity and yield stress of the one-part AAMs. The mechanisms that govern such observations are further discussed.

Original language	English
Article number	126611
Journal	Construction and Building Materials
Volume	323
DOIs	https://doi.org/10.1016/j.conbuildmat.2022.126611
Publication status	Published - 14 Mar 2022

Keywords

Admixture
Adsorption
Alkali-activated materials (AAMs)
Calorimetry
Geopolymer
One-part
Rheology
Superplasticizer
Yield stress
Zeta potential

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2022.126611

Cite this

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title = "Effects of delayed addition of polycarboxylate ether on one-part alkali-activated fly ash/slag pastes: Adsorption, reaction kinetics, and rheology",

abstract = "The admixture addition method is one of the vital factors influencing the fresh performance of ordinary Portland cement (OPC) through directly affecting the adsorption, hydration, and rheology. However, such an issue is less researched in the one-part alkali-activated materials (AAMs), which have great potentials in the industry due to their simple operation, similar to OPC. This study reports and discusses the effects of delayed polycarboxylate ether (PCE) addition at different contents on adsorption, reaction kinetics, and rheology of one-part AAMs. It is found that the delayed PCE addition had minimized the competitive adsorption phenomenon and reduced the consumption rate of PCE surfactants, which in turn facilitates easier adsorption of silicate species onto the GGBS grains. This had decreased the retardation effect of PCE, slightly improved the compressive strength, and lowered the viscosity and yield stress of the one-part AAMs. The mechanisms that govern such observations are further discussed.",

keywords = "Admixture, Adsorption, Alkali-activated materials (AAMs), Calorimetry, Geopolymer, One-part, Rheology, Superplasticizer, Yield stress, Zeta potential",

author = "Yazan Alrefaei 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 acknowledge the financial support received from the Hong Kong RGC General Research Fund (Project code: 15223120) and NSFC/RGC Joint Research Scheme (Project code: N_PolyU542/20). The contribution of Mr. Jiancong Lao in testing and preparing the compressive strength and SEM samples is acknowledged. Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

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AU - Alrefaei, Yazan

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 acknowledge the financial support received from the Hong Kong RGC General Research Fund (Project code: 15223120) and NSFC/RGC Joint Research Scheme (Project code: N_PolyU542/20). The contribution of Mr. Jiancong Lao in testing and preparing the compressive strength and SEM samples is acknowledged. Publisher Copyright: © 2022 Elsevier Ltd

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Y1 - 2022/3/14

N2 - The admixture addition method is one of the vital factors influencing the fresh performance of ordinary Portland cement (OPC) through directly affecting the adsorption, hydration, and rheology. However, such an issue is less researched in the one-part alkali-activated materials (AAMs), which have great potentials in the industry due to their simple operation, similar to OPC. This study reports and discusses the effects of delayed polycarboxylate ether (PCE) addition at different contents on adsorption, reaction kinetics, and rheology of one-part AAMs. It is found that the delayed PCE addition had minimized the competitive adsorption phenomenon and reduced the consumption rate of PCE surfactants, which in turn facilitates easier adsorption of silicate species onto the GGBS grains. This had decreased the retardation effect of PCE, slightly improved the compressive strength, and lowered the viscosity and yield stress of the one-part AAMs. The mechanisms that govern such observations are further discussed.

AB - The admixture addition method is one of the vital factors influencing the fresh performance of ordinary Portland cement (OPC) through directly affecting the adsorption, hydration, and rheology. However, such an issue is less researched in the one-part alkali-activated materials (AAMs), which have great potentials in the industry due to their simple operation, similar to OPC. This study reports and discusses the effects of delayed polycarboxylate ether (PCE) addition at different contents on adsorption, reaction kinetics, and rheology of one-part AAMs. It is found that the delayed PCE addition had minimized the competitive adsorption phenomenon and reduced the consumption rate of PCE surfactants, which in turn facilitates easier adsorption of silicate species onto the GGBS grains. This had decreased the retardation effect of PCE, slightly improved the compressive strength, and lowered the viscosity and yield stress of the one-part AAMs. The mechanisms that govern such observations are further discussed.

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KW - Calorimetry

KW - Geopolymer

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KW - Rheology

KW - Superplasticizer

KW - Yield stress

KW - Zeta potential

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Effects of delayed addition of polycarboxylate ether on one-part alkali-activated fly ash/slag pastes: Adsorption, reaction kinetics, and rheology

Abstract

Keywords

ASJC Scopus subject areas

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