Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete

Lan-Ping Qian; Muhammad Riaz Ahmad; Jian-Cong Lao; Jian-Guo Dai

doi:10.1016/j.resconrec.2023.106893

Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete

Lan-Ping Qian, Muhammad Riaz Ahmad^*, Jian-Cong Lao, Jian-Guo Dai^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

45 Citations (Scopus)

Abstract

This study proposed simultaneous utilization of red mud (RM) and flue gas residues (FGR) as a partial replacement of traditional precursors and energy-intensive activators. Reaction mechanisms of geopolymer pastes were investigated through isothermal calorimetry, X-ray diffraction, thermogravimetry and infrared spectroscopy, by varying the dosage of RM (40%) and FGR (24%, 32%). Results showed that use of RM and FGR as a replacement of FA and commercial activator had a limited influence on the compressive strength. RM and FGR participated in reaction at a slower rate. After optimization, heat-cured FGR0.32 mix was selected to manufacture geopolymer aggregates (GPA). Engineering properties, cost analysis and environmental impact of GPA were evaluated. Natural aggregates (NA) were replaced by GPA at replacement levels of 25%, 50%, 75% and 100% by volume to prepare concrete. GPA concrete with 25% and 100% replacement level could achieve the 94.6% and 86.6% of NA concrete strength respectively at 28 days age. © 2023 Elsevier B.V.

Original language	English
Article number	106893
Journal	Resources, Conservation and Recycling
Volume	191
Online published	6 Feb 2023
DOIs	https://doi.org/10.1016/j.resconrec.2023.106893
Publication status	Published - Apr 2023
Externally published	Yes

Funding

The authors would like to acknowledge the financial support received from NSFC/RGC Joint Research Scheme ( N_PolyU542/20 ), Hong Kong RGC General Research Fund (No. 15223120 ), The Hong Kong Polytechnic University through the Research centre for Resources Engineering towards Carbon Neutrality (No. BBC7 ) and the Hong Kong Polytechnic University Ph.D. studentship, awarded to the first author.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 9 Industry, Innovation, and Infrastructure

Research Keywords

Flue gas residues (FGR)
Geopolymer aggregate concrete (GAC)
Geopolymer aggregates (GPA)
Mechanical properties
Red mud (RM)

RGC Funding Information

RGC-funded

Access Output

10.1016/j.resconrec.2023.106893

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Cite this

@article{e2882b910c64463ebf998b06dfba5bad,

title = "Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete",

abstract = "This study proposed simultaneous utilization of red mud (RM) and flue gas residues (FGR) as a partial replacement of traditional precursors and energy-intensive activators. Reaction mechanisms of geopolymer pastes were investigated through isothermal calorimetry, X-ray diffraction, thermogravimetry and infrared spectroscopy, by varying the dosage of RM (40%) and FGR (24%, 32%). Results showed that use of RM and FGR as a replacement of FA and commercial activator had a limited influence on the compressive strength. RM and FGR participated in reaction at a slower rate. After optimization, heat-cured FGR0.32 mix was selected to manufacture geopolymer aggregates (GPA). Engineering properties, cost analysis and environmental impact of GPA were evaluated. Natural aggregates (NA) were replaced by GPA at replacement levels of 25%, 50%, 75% and 100% by volume to prepare concrete. GPA concrete with 25% and 100% replacement level could achieve the 94.6% and 86.6% of NA concrete strength respectively at 28 days age. {\textcopyright} 2023 Elsevier B.V.",

keywords = "Flue gas residues (FGR), Geopolymer aggregate concrete (GAC), Geopolymer aggregates (GPA), Mechanical properties, Red mud (RM)",

author = "Lan-Ping Qian and Ahmad, {Muhammad Riaz} and Jian-Cong Lao and Jian-Guo Dai",

year = "2023",

month = apr,

doi = "10.1016/j.resconrec.2023.106893",

language = "English",

volume = "191",

journal = "Resources, Conservation and Recycling",

issn = "0921-3449",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete

AU - Qian, Lan-Ping

AU - Ahmad, Muhammad Riaz

AU - Lao, Jian-Cong

AU - Dai, Jian-Guo

PY - 2023/4

Y1 - 2023/4

N2 - This study proposed simultaneous utilization of red mud (RM) and flue gas residues (FGR) as a partial replacement of traditional precursors and energy-intensive activators. Reaction mechanisms of geopolymer pastes were investigated through isothermal calorimetry, X-ray diffraction, thermogravimetry and infrared spectroscopy, by varying the dosage of RM (40%) and FGR (24%, 32%). Results showed that use of RM and FGR as a replacement of FA and commercial activator had a limited influence on the compressive strength. RM and FGR participated in reaction at a slower rate. After optimization, heat-cured FGR0.32 mix was selected to manufacture geopolymer aggregates (GPA). Engineering properties, cost analysis and environmental impact of GPA were evaluated. Natural aggregates (NA) were replaced by GPA at replacement levels of 25%, 50%, 75% and 100% by volume to prepare concrete. GPA concrete with 25% and 100% replacement level could achieve the 94.6% and 86.6% of NA concrete strength respectively at 28 days age. © 2023 Elsevier B.V.

AB - This study proposed simultaneous utilization of red mud (RM) and flue gas residues (FGR) as a partial replacement of traditional precursors and energy-intensive activators. Reaction mechanisms of geopolymer pastes were investigated through isothermal calorimetry, X-ray diffraction, thermogravimetry and infrared spectroscopy, by varying the dosage of RM (40%) and FGR (24%, 32%). Results showed that use of RM and FGR as a replacement of FA and commercial activator had a limited influence on the compressive strength. RM and FGR participated in reaction at a slower rate. After optimization, heat-cured FGR0.32 mix was selected to manufacture geopolymer aggregates (GPA). Engineering properties, cost analysis and environmental impact of GPA were evaluated. Natural aggregates (NA) were replaced by GPA at replacement levels of 25%, 50%, 75% and 100% by volume to prepare concrete. GPA concrete with 25% and 100% replacement level could achieve the 94.6% and 86.6% of NA concrete strength respectively at 28 days age. © 2023 Elsevier B.V.

KW - Flue gas residues (FGR)

KW - Geopolymer aggregate concrete (GAC)

KW - Geopolymer aggregates (GPA)

KW - Mechanical properties

KW - Red mud (RM)

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U2 - 10.1016/j.resconrec.2023.106893

DO - 10.1016/j.resconrec.2023.106893

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85147370760

SN - 0921-3449

VL - 191

JO - Resources, Conservation and Recycling

JF - Resources, Conservation and Recycling

M1 - 106893

ER -

Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete

Abstract

Funding

UN SDGs

Research Keywords

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

GRF: Development of Multiple Functional Geopolymer Coating for Performance Upgrading of Concrete Building Structures

NSFC: Research and Development on Waste Ash/Slag-based Artificial Aggregates for Applications in Concrete

Cite this

Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete

Abstract

Funding

UN SDGs

Research Keywords

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Projects

GRF: Development of Multiple Functional Geopolymer Coating for Performance Upgrading of Concrete Building Structures

NSFC: Research and Development on Waste Ash/Slag-based Artificial Aggregates for Applications in Concrete

Cite this