Use of CO2-active BOFS binder in the production of artificial aggregates with waste concrete powder

Shaoxiang Deng; Pengfei Ren; Yi Jiang; Xin Shao; Tung Chai Ling

doi:10.1016/j.resconrec.2022.106332

Use of CO₂-active BOFS binder in the production of artificial aggregates with waste concrete powder

Shaoxiang Deng, Pengfei Ren, Yi Jiang, Xin Shao, Tung Chai Ling

Research output: Journal article publication › Journal article › Academic research › peer-review

31 Citations (Scopus)

Abstract

This study investigated the possibility of using CO₂-active basic oxygen furnace slag (BOFS) as binder for the production of AAs with low-value waste concrete powder (WCP). The effects of curing methods (CO₂ and natural air curing) and BOFS dosages on the AAs properties were analyzed. The results showed that BOFS could be successfully used as binder to produce WCP granulated AAs, with attained loose bulk density, crushing strength and water absorption of 1220 kg/m³, 3.6 MPa and 8.6%, respectively. Increasing the BOFS dosage enhanced the crushing strength and decreased the water absorption of AAs. CO₂ curing resulted in C-S-H and CaCO₃ formation, which contributed to further improving the crushing strength by 30%-109% and decreasing the water absorption by 12–22%. From an environmental perspective, the produced BOFS-WCP granulated AAs activated with CO₂ were able to reduce global warming potential by 25% compared with conventional AAs containing 20 wt.% cement as binder.

Original language	English
Article number	106332
Journal	Resources, Conservation and Recycling
Volume	182
DOIs	https://doi.org/10.1016/j.resconrec.2022.106332
Publication status	Published - Jul 2022

Keywords

Artificial aggregate
Basic oxygen furnace slag
CO curing
Waste concrete powder

ASJC Scopus subject areas

Waste Management and Disposal
Economics and Econometrics

More information

10.1016/j.resconrec.2022.106332

Cite this

@article{b73ad4fb4b4e42fdaf5fbd80c49f237d,

title = "Use of CO2-active BOFS binder in the production of artificial aggregates with waste concrete powder",

abstract = "This study investigated the possibility of using CO2-active basic oxygen furnace slag (BOFS) as binder for the production of AAs with low-value waste concrete powder (WCP). The effects of curing methods (CO2 and natural air curing) and BOFS dosages on the AAs properties were analyzed. The results showed that BOFS could be successfully used as binder to produce WCP granulated AAs, with attained loose bulk density, crushing strength and water absorption of 1220 kg/m3, 3.6 MPa and 8.6%, respectively. Increasing the BOFS dosage enhanced the crushing strength and decreased the water absorption of AAs. CO2 curing resulted in C-S-H and CaCO3 formation, which contributed to further improving the crushing strength by 30%-109% and decreasing the water absorption by 12–22%. From an environmental perspective, the produced BOFS-WCP granulated AAs activated with CO2 were able to reduce global warming potential by 25% compared with conventional AAs containing 20 wt.% cement as binder.",

keywords = "Artificial aggregate, Basic oxygen furnace slag, CO curing, Waste concrete powder",

author = "Shaoxiang Deng and Pengfei Ren and Yi Jiang and Xin Shao and Ling, {Tung Chai}",

note = "Funding Information: Financial support from the National Natural Science Foundation of China (NSFC) (Grant No. 52078202) is gratefully acknowledged. Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

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language = "English",

volume = "182",

journal = "Resources, Conservation and Recycling",

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AU - Deng, Shaoxiang

AU - Ren, Pengfei

AU - Jiang, Yi

AU - Shao, Xin

AU - Ling, Tung Chai

PY - 2022/7

Y1 - 2022/7

N2 - This study investigated the possibility of using CO2-active basic oxygen furnace slag (BOFS) as binder for the production of AAs with low-value waste concrete powder (WCP). The effects of curing methods (CO2 and natural air curing) and BOFS dosages on the AAs properties were analyzed. The results showed that BOFS could be successfully used as binder to produce WCP granulated AAs, with attained loose bulk density, crushing strength and water absorption of 1220 kg/m3, 3.6 MPa and 8.6%, respectively. Increasing the BOFS dosage enhanced the crushing strength and decreased the water absorption of AAs. CO2 curing resulted in C-S-H and CaCO3 formation, which contributed to further improving the crushing strength by 30%-109% and decreasing the water absorption by 12–22%. From an environmental perspective, the produced BOFS-WCP granulated AAs activated with CO2 were able to reduce global warming potential by 25% compared with conventional AAs containing 20 wt.% cement as binder.

AB - This study investigated the possibility of using CO2-active basic oxygen furnace slag (BOFS) as binder for the production of AAs with low-value waste concrete powder (WCP). The effects of curing methods (CO2 and natural air curing) and BOFS dosages on the AAs properties were analyzed. The results showed that BOFS could be successfully used as binder to produce WCP granulated AAs, with attained loose bulk density, crushing strength and water absorption of 1220 kg/m3, 3.6 MPa and 8.6%, respectively. Increasing the BOFS dosage enhanced the crushing strength and decreased the water absorption of AAs. CO2 curing resulted in C-S-H and CaCO3 formation, which contributed to further improving the crushing strength by 30%-109% and decreasing the water absorption by 12–22%. From an environmental perspective, the produced BOFS-WCP granulated AAs activated with CO2 were able to reduce global warming potential by 25% compared with conventional AAs containing 20 wt.% cement as binder.

KW - Artificial aggregate

KW - Basic oxygen furnace slag

KW - CO curing

KW - Waste concrete powder

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