University of Oulu

Nguyen, H., Kinnunen, P., Gijbels, K., Carvelli, V., Sreenivasan, H., Kantola, A. M., … Illikainen, M. (2019). Ettringite-based binder from ladle slag and gypsum – The effect of citric acid on fresh and hardened state properties. Cement and Concrete Research, 123, 105800. https://doi.org/10.1016/j.cemconres.2019.105800

Ettringite-based binder from ladle slag and gypsum : the effect of citric acid on fresh and hardened state properties

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Author: Nguyen, Hoang1; Kinnunen, Päivö1; Gijbels, Katrijn2;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, Pentti Kaiteran katu 1, 90014 Oulu, Finland
2Nuclear Technological Centre, Hasselt University, Agoralaan, Gebouw H, 3590 Diepenbeek, Belgium
3Department A.B.C., Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133 Milan, Italy
4NMR Research Unit, University of Oulu, Pentti Kaiteran katu 1, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.9 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019070222640
Language: English
Published: Elsevier, 2019
Publish Date: 2019-07-02
Description:

Abstract

The retardant effects of citric acid on the properties of ettringite binders are not yet fully understood. This investigation provides insights into the effects of citric acid on both the fresh and hardened state properties of the binder produced from the hydration between ladle slag and gypsum (LSG). The results revealed that LSG’s initial setting time could be controlled via different citric acid contents and could range from 20 min to 2 h. Citric acid is effective at relatively high dosages; in its absence, ettringite formed almost immediately directly following exposure to water. The presence of citric acid alters the hydration reactions in LSG. AFm was found to be one of main hydration products; citric acid promoted the conversion from ettringite to monosulfate, detected by using solid-state ²⁷Al magic-angle spinning nuclear magnetic resonance spectroscopy. In addition, citric acid increased the compressive strength of LSG mortars by up to 45%.

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Series: Cement and concrete research
ISSN: 0008-8846
ISSN-E: 1873-3948
ISSN-L: 0008-8846
Volume: 123
Article number: 105800
DOI: 10.1016/j.cemconres.2019.105800
OADOI: https://oadoi.org/10.1016/j.cemconres.2019.105800
Type of Publication: A1 Journal article – refereed
Field of Science: 212 Civil and construction engineering
216 Materials engineering
Subjects:
Funding: This work was done as part of the FLOW project (project number 8904/31/2017) funded by Business Finland in the ERA-MIN 2 Innovation program (EU Horizon 2020 program) and industrial partners including SSAB Europe Oy, Saint-Gobain Finland Oy, Kiertokaari Oy, and Destaclean Oy. Hoang Nguyen gratefully acknowledges financial support from the Tauno Tönning Research Foundation. A.M.K. and V.-V.T. acknowledge financial support from the Kvantum Institute (University of Oulu) and the Academy of Finland (grant numbers 289649 and 294027).
Academy of Finland Grant Number: 289649
294027
Detailed Information: 289649 (Academy of Finland Funding decision)
294027 (Academy of Finland Funding decision)
Dataset Reference: Supplementary data:
  https://ars.els-cdn.com/content/image/1-s2.0-S0008884619300560-mmc1.docx
Copyright information: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).
  https://creativecommons.org/licenses/by-nc-nd/4.0/