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Carbon Dioxide–Activated Steel Slag for Slag-Bonded Wallboard Application

Shao, Yixin / El-Baghdadi, Ahmed / He, Zhen / Mucci, Alfonso / Fournier, Benoit

The feasibility of making slag-bonded construction wallboard through carbon dioxide activation of steel slag was investigated. The steel slag used in the study is a by-product of the Klockner Oxygen Blown Maxhutte (KOBM) steel-making process. The ${CO}_{2}$ -activated steel slag can potentially be used as a cementing material in place of ordinary portland cement (OPC). The 2-h carbonation strength of the activated steel slag reached 46 MPa and the 28-day strength after carbonation and hydration was more than 60 MPa. Carbonation of steel slag enabled ${CO}_{2}$ utilization up to 6.8% on a dry-slag-mass basis. The high early strength obtained in ${CO}_{2}$ -activated slag is attributed to the rapid formation of calcium-silicate-hydrates and calcium carbonates. The precipitation of rhombohedral ${CaCO}_{3}$ nanoparticles significantly enhances packing density and reduces the porosity of the carbonate matrix. A slag-bonded wallboard using sawdust as lightweight filler was successfully fabricated and its mechanical performance was comparable to cement-based commercial products.

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Carbon Dioxide–Activated Steel Slag for Slag-Bonded Wallboard Application

Shao, Yixin / El-Baghdadi, Ahmed / He, Zhen / Mucci, Alfonso / Fournier, Benoit

The feasibility of making slag-bonded construction wallboard through carbon dioxide activation of steel slag was investigated. The steel slag used in the study is a by-product of the Klockner Oxygen Blown Maxhutte (KOBM) steel-making process. The ${CO}_{2}$ -activated steel slag can potentially be used as a cementing material in place of ordinary portland cement (OPC). The 2-h carbonation strength of the activated steel slag reached 46 MPa and the 28-day strength after carbonation and hydration was more than 60 MPa. Carbonation of steel slag enabled ${CO}_{2}$ utilization up to 6.8% on a dry-slag-mass basis. The high early strength obtained in ${CO}_{2}$ -activated slag is attributed to the rapid formation of calcium-silicate-hydrates and calcium carbonates. The precipitation of rhombohedral ${CaCO}_{3}$ nanoparticles significantly enhances packing density and reduces the porosity of the carbonate matrix. A slag-bonded wallboard using sawdust as lightweight filler was successfully fabricated and its mechanical performance was comparable to cement-based commercial products.

Carbon Dioxide–Activated Steel Slag for Slag-Bonded Wallboard Application

Shao, Yixin / El-Baghdadi, Ahmed / He, Zhen / Mucci, Alfonso / Fournier, Benoit

The feasibility of making slag-bonded construction wallboard through carbon dioxide activation of steel slag was investigated. The steel slag used in the study is a by-product of the Klockner Oxygen Blown Maxhutte (KOBM) steel-making process. The ${CO}_{2}$ -activated steel slag can potentially be used as a cementing material in place of ordinary portland cement (OPC). The 2-h carbonation strength of the activated steel slag reached 46 MPa and the 28-day strength after carbonation and hydration was more than 60 MPa. Carbonation of steel slag enabled ${CO}_{2}$ utilization up to 6.8% on a dry-slag-mass basis. The high early strength obtained in ${CO}_{2}$ -activated slag is attributed to the rapid formation of calcium-silicate-hydrates and calcium carbonates. The precipitation of rhombohedral ${CaCO}_{3}$ nanoparticles significantly enhances packing density and reduces the porosity of the carbonate matrix. A slag-bonded wallboard using sawdust as lightweight filler was successfully fabricated and its mechanical performance was comparable to cement-based commercial products.

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Title:

Carbon Dioxide–Activated Steel Slag for Slag-Bonded Wallboard Application

Contributors:

Shao, Yixin (author) / El-Baghdadi, Ahmed (author) / He, Zhen (author) / Mucci, Alfonso (author) / Fournier, Benoit (author)

Published in:

Journal of Materials in Civil Engineering ; 27

Publication date:

2014-07-14

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0001055

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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