Effect of High-Range Water-Reducing Admixtures on Alkali-Activated Slag Concrete

Journal article (2022)

Authors

Yubo Sun Universiteit Gent
Yaxin Tao Universiteit Gent
A. V. Rahul Universiteit Gent
G. Ye Materials and Environment - CEG , Universiteit Gent
Geert De Schutter Universiteit Gent
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2022 Yubo Sun, Yaxin Tao, A. V. Rahul, G. Ye, Geert De Schutter
DOI
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https://doi.org/10.14359/51737192
Rheology Alkali-activated slag concrete Reaction kinetics Strength development Superplasticizer
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Published Date

2022

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

The rapid workability loss of alkali-activated materials (AAM) has been a major obstacle limiting its onsite application. In this study, two conventional SPs (made of polynaphthalene sulfonate (PNS) and lignosulfonate (LS) salts), which have been reported to be effective in some specific AAM mixtures were separately applied in alkali-activated slag (AAS) concretes. A comprehensive testing program was performed to study their effect on reaction kinetics, rheology evolution, and strength development. Results showed sodium silicate-activated AAS mixtures exhibited lower yield stress than those activated by sodium hydroxide. In hydroxide media, PNS and LS remained effective to reduce yield stress and increase slump value, while they both failed to improve the rheological behavior of AAS activated by silicate. Moreover, the inclusion of 2% admixtures did not result in much strength reduction in both activators although LS showed a retardation effect and subsequent increase in the setting time in the fresh state.