Reactivity of BOF slag under autoclaving conditions

J.C.O. Zepper; S.R. van der Laan; K. Schollbach; H.J.H. Brouwers

doi:10.1016/j.conbuildmat.2022.129957

Reactivity of BOF slag under autoclaving conditions

Building Materials

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Abstract

Basic oxygen furnace (BOF) slag is an industrial by-product of the steel industry and is currently used only in low-end applications like road fill or is landfilled. This study explores the possibility of BOF slag as raw material in the building industry by investigating its reactivity under autoclave conditions. The results reveal that autoclaving improves the mechanical performance as well as increases the reactivity based on the degree of hydration in BOF slag containing samples. Although, >40 wt% of hydration product (α-C₂SH, hydrogarnet, portlandite and amorphous) was formed after autoclaving, autoclaved BOF slag containing samples show poor mechanical performance.

Original language	English
Article number	129957
Number of pages	14
Journal	Construction and Building Materials
Volume	364
DOIs	https://doi.org/10.1016/j.conbuildmat.2022.129957
Publication status	Published - 18 Jan 2023

Funding

The authors would like to express their gratitude for the financial support of the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) by funding this research (project no.10023338) and Materials Innovation Institute (M2i) for managing this project. Furthermore, the authors would like to acknowledge the following sponsors of this research: Tata Steel; ENCI; V.d. Bosch Beton; Beton Mortel; Inashco; Hess AAC systems. The recognition for helping with the autoclave treatment of the samples belongs to Ladislaus Heinz of Hess AAC Systems. A special thanks goes to Frank van der Does of Tata Steel Ijmuiden for the SEM/EDS sample preparation and measurement. Moreover, Anneke Delsing at TU Eindhoven is thanked for the analysis of the leachates with ICP-OES.

Funders	Funder number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek	10023338
Materials Innovation Institute (M2i)

Keywords

BOF slag
Hydrogarnet
Hydrothermal activation
Microstructure
Mineralogy
Reactivity

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10.1016/j.conbuildmat.2022.129957

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Cite this

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title = "Reactivity of BOF slag under autoclaving conditions",

abstract = "Basic oxygen furnace (BOF) slag is an industrial by-product of the steel industry and is currently used only in low-end applications like road fill or is landfilled. This study explores the possibility of BOF slag as raw material in the building industry by investigating its reactivity under autoclave conditions. The results reveal that autoclaving improves the mechanical performance as well as increases the reactivity based on the degree of hydration in BOF slag containing samples. Although, >40 wt\% of hydration product (α-C2SH, hydrogarnet, portlandite and amorphous) was formed after autoclaving, autoclaved BOF slag containing samples show poor mechanical performance.",

keywords = "BOF slag, Hydrogarnet, Hydrothermal activation, Microstructure, Mineralogy, Reactivity",

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AU - van der Laan, S.R.

AU - Schollbach, K.

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PY - 2023/1/18

Y1 - 2023/1/18

N2 - Basic oxygen furnace (BOF) slag is an industrial by-product of the steel industry and is currently used only in low-end applications like road fill or is landfilled. This study explores the possibility of BOF slag as raw material in the building industry by investigating its reactivity under autoclave conditions. The results reveal that autoclaving improves the mechanical performance as well as increases the reactivity based on the degree of hydration in BOF slag containing samples. Although, >40 wt% of hydration product (α-C2SH, hydrogarnet, portlandite and amorphous) was formed after autoclaving, autoclaved BOF slag containing samples show poor mechanical performance.

AB - Basic oxygen furnace (BOF) slag is an industrial by-product of the steel industry and is currently used only in low-end applications like road fill or is landfilled. This study explores the possibility of BOF slag as raw material in the building industry by investigating its reactivity under autoclave conditions. The results reveal that autoclaving improves the mechanical performance as well as increases the reactivity based on the degree of hydration in BOF slag containing samples. Although, >40 wt% of hydration product (α-C2SH, hydrogarnet, portlandite and amorphous) was formed after autoclaving, autoclaved BOF slag containing samples show poor mechanical performance.

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Reactivity of BOF slag under autoclaving conditions

Abstract

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Keywords

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New Building and Construction Study Results from Eindhoven University of Technology Described (Reactivity of Bof Slag Under Autoclaving Conditions)

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Reactivity of BOF slag under autoclaving conditions

Abstract

Funding

Keywords

Access to Document

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New Building and Construction Study Results from Eindhoven University of Technology Described (Reactivity of Bof Slag Under Autoclaving Conditions)

Cite this