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

Author(s)

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

Detail(s)

Original language	English
Article number	106893
Journal / Publication	Resources, Conservation and Recycling
Volume	191
Online published	6 Feb 2023
Publication status	Published - Apr 2023
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/j.resconrec.2023.106893 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85147370760&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(e2882b91-0c64-463e-bf99-8b06dfba5bad).html

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.

Research Area(s)

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

SDG 9 - Industry, Innovation, and Infrastructure

Citation Format(s)

[ RIS ] [ BibTeX ]

Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete. / Qian, Lan-Ping; Ahmad, Muhammad Riaz; Lao, Jian-Cong et al.
In: Resources, Conservation and Recycling, Vol. 191, 106893, 04.2023.

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

Qian, L-P, Ahmad, MR, Lao, J-C & Dai, J-G 2023, 'Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete', Resources, Conservation and Recycling, vol. 191, 106893. https://doi.org/10.1016/j.resconrec.2023.106893

Qian, L.-P., Ahmad, M. R., Lao, J.-C., & Dai, J.-G. (2023). Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete. Resources, Conservation and Recycling, 191, Article 106893. https://doi.org/10.1016/j.resconrec.2023.106893

Qian LP, Ahmad MR, Lao JC, Dai JG. Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete. Resources, Conservation and Recycling. 2023 Apr;191:106893. Epub 2023 Feb 6. doi: 10.1016/j.resconrec.2023.106893

Qian, Lan-Ping ; Ahmad, Muhammad Riaz ; Lao, Jian-Cong et al. / Recycling of red mud and flue gas residues in geopolymer aggregates (GPA) for sustainable concrete. In: Resources, Conservation and Recycling. 2023 ; Vol. 191.