Effects of internal CO2 curing provided by biochar on the carbonation and properties of steel slag-based artificial lightweight aggregates (SALAs)

Maochun Xu; Yuyang Zhang; Shuo Yang; Liwu Mo; Peng Liu

doi:10.1016/j.cemconcomp.2023.105197

Effects of internal CO₂ curing provided by biochar on the carbonation and properties of steel slag-based artificial lightweight aggregates (SALAs)

Maochun Xu, Yuyang Zhang, Shuo Yang, Liwu Mo, Peng Liu

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

Diffusion of CO₂ strongly influenced the carbonation efficiency of steel slag. A novel approach for preparing steel slag-based artificial lightweight aggregates (SALAs) was proposed, in which biochar was employed to provide internal CO₂ curing and reduce the bulk density. Owing to the additional diffusion channels and temporary storage tank for CO₂ provided by the biochar, the carbonation degree of steel slag was effectively improved, leading to improved performance of SALAs as well as concrete. For instance, with the addition of 3 wt% biochar, the CO₂ uptake was increased by 24.3%, the crushing resistance was 5.7 MPa, while the bulk density was reduced to 1070 kg/m³. In addition, the SALAs improved the compressive strengths and volume stability of concrete.

Original language	English
Article number	105197
Journal	Cement and Concrete Composites
Volume	142
DOIs	https://doi.org/10.1016/j.cemconcomp.2023.105197
State	Published - Sep 2023

Keywords

Accelerated carbonation
Artificial lightweight aggregate
Biochar
Concrete
Steel slag

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10.1016/j.cemconcomp.2023.105197

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title = "Effects of internal CO2 curing provided by biochar on the carbonation and properties of steel slag-based artificial lightweight aggregates (SALAs)",

abstract = "Diffusion of CO2 strongly influenced the carbonation efficiency of steel slag. A novel approach for preparing steel slag-based artificial lightweight aggregates (SALAs) was proposed, in which biochar was employed to provide internal CO2 curing and reduce the bulk density. Owing to the additional diffusion channels and temporary storage tank for CO2 provided by the biochar, the carbonation degree of steel slag was effectively improved, leading to improved performance of SALAs as well as concrete. For instance, with the addition of 3 wt% biochar, the CO2 uptake was increased by 24.3%, the crushing resistance was 5.7 MPa, while the bulk density was reduced to 1070 kg/m3. In addition, the SALAs improved the compressive strengths and volume stability of concrete.",

keywords = "Accelerated carbonation, Artificial lightweight aggregate, Biochar, Concrete, Steel slag",

author = "Maochun Xu and Yuyang Zhang and Shuo Yang and Liwu Mo and Peng Liu",

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T1 - Effects of internal CO2 curing provided by biochar on the carbonation and properties of steel slag-based artificial lightweight aggregates (SALAs)

AU - Xu, Maochun

AU - Zhang, Yuyang

AU - Yang, Shuo

AU - Mo, Liwu

AU - Liu, Peng

PY - 2023/9

Y1 - 2023/9

N2 - Diffusion of CO2 strongly influenced the carbonation efficiency of steel slag. A novel approach for preparing steel slag-based artificial lightweight aggregates (SALAs) was proposed, in which biochar was employed to provide internal CO2 curing and reduce the bulk density. Owing to the additional diffusion channels and temporary storage tank for CO2 provided by the biochar, the carbonation degree of steel slag was effectively improved, leading to improved performance of SALAs as well as concrete. For instance, with the addition of 3 wt% biochar, the CO2 uptake was increased by 24.3%, the crushing resistance was 5.7 MPa, while the bulk density was reduced to 1070 kg/m3. In addition, the SALAs improved the compressive strengths and volume stability of concrete.

AB - Diffusion of CO2 strongly influenced the carbonation efficiency of steel slag. A novel approach for preparing steel slag-based artificial lightweight aggregates (SALAs) was proposed, in which biochar was employed to provide internal CO2 curing and reduce the bulk density. Owing to the additional diffusion channels and temporary storage tank for CO2 provided by the biochar, the carbonation degree of steel slag was effectively improved, leading to improved performance of SALAs as well as concrete. For instance, with the addition of 3 wt% biochar, the CO2 uptake was increased by 24.3%, the crushing resistance was 5.7 MPa, while the bulk density was reduced to 1070 kg/m3. In addition, the SALAs improved the compressive strengths and volume stability of concrete.

KW - Accelerated carbonation

KW - Artificial lightweight aggregate

KW - Biochar

KW - Concrete

KW - Steel slag

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JO - Cement and Concrete Composites

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Effects of internal CO₂ curing provided by biochar on the carbonation and properties of steel slag-based artificial lightweight aggregates (SALAs)

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Keywords

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