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A platform for research: civil engineering, architecture and urbanism
Development and optimization of phosphogypsum-based geopolymer cement
https://orcid.org/0000-0003-3374-6725
https://orcid.org/0000-0003-2862-3392
Highlights The PBG cement was prepared using phosphogypsum waste, and the 28-day compressive strength of the cement can exceed 60 MPa. The effects of fly ash content, citric acid dosage, and sodium metasilicate dosage on the properties of the PBG cement were investigated. Qualitative and quantitative analyses of the hydration products and micromorphology of the PBG cement were carried out. The effect of the water addition process on the strength and fluidity of the cement at a constant total water consumption was determined.
Abstract Phosphogypsum (PG) is a solid waste product that is generated in the phosphoric acid manufacturing process, most of which is currently sent to landfills rather than reused. In this study, beta-hemihydrate phosphogypsum (β-HPG), slag, fly ash (FA) and alkali activator were mixed to form a phosphogypsum-based geopolymer (PBG) cement. The effects of the slag and FA content, citric acid (CA) dosage, sodium metasilicate (SM) dosage, and water addition process were investigated. The results indicated that the 28-day unconfined compressive strength (UCS) of the cement can exceed 60 MPa when a reasonable mix proportion is adopted. The hydration products and strength formation mechanism of the PBG cement were assessed using XRD-Rietveld and SEM-EDS. The micro-analysis results indicated that the main hydration products were dihydrate phosphogypsum, ettringite, and CSH gel, which jointly provided the strength for the PBG cement. The PBG cement may improve the utilisation prospects of PG waste.
Development and optimization of phosphogypsum-based geopolymer cement
https://orcid.org/0000-0003-3374-6725
https://orcid.org/0000-0003-2862-3392
Highlights The PBG cement was prepared using phosphogypsum waste, and the 28-day compressive strength of the cement can exceed 60 MPa. The effects of fly ash content, citric acid dosage, and sodium metasilicate dosage on the properties of the PBG cement were investigated. Qualitative and quantitative analyses of the hydration products and micromorphology of the PBG cement were carried out. The effect of the water addition process on the strength and fluidity of the cement at a constant total water consumption was determined.
Abstract Phosphogypsum (PG) is a solid waste product that is generated in the phosphoric acid manufacturing process, most of which is currently sent to landfills rather than reused. In this study, beta-hemihydrate phosphogypsum (β-HPG), slag, fly ash (FA) and alkali activator were mixed to form a phosphogypsum-based geopolymer (PBG) cement. The effects of the slag and FA content, citric acid (CA) dosage, sodium metasilicate (SM) dosage, and water addition process were investigated. The results indicated that the 28-day unconfined compressive strength (UCS) of the cement can exceed 60 MPa when a reasonable mix proportion is adopted. The hydration products and strength formation mechanism of the PBG cement were assessed using XRD-Rietveld and SEM-EDS. The micro-analysis results indicated that the main hydration products were dihydrate phosphogypsum, ettringite, and CSH gel, which jointly provided the strength for the PBG cement. The PBG cement may improve the utilisation prospects of PG waste.
Development and optimization of phosphogypsum-based geopolymer cement
https://orcid.org/0000-0003-3374-6725
https://orcid.org/0000-0003-2862-3392
Highlights The PBG cement was prepared using phosphogypsum waste, and the 28-day compressive strength of the cement can exceed 60 MPa. The effects of fly ash content, citric acid dosage, and sodium metasilicate dosage on the properties of the PBG cement were investigated. Qualitative and quantitative analyses of the hydration products and micromorphology of the PBG cement were carried out. The effect of the water addition process on the strength and fluidity of the cement at a constant total water consumption was determined.
Abstract Phosphogypsum (PG) is a solid waste product that is generated in the phosphoric acid manufacturing process, most of which is currently sent to landfills rather than reused. In this study, beta-hemihydrate phosphogypsum (β-HPG), slag, fly ash (FA) and alkali activator were mixed to form a phosphogypsum-based geopolymer (PBG) cement. The effects of the slag and FA content, citric acid (CA) dosage, sodium metasilicate (SM) dosage, and water addition process were investigated. The results indicated that the 28-day unconfined compressive strength (UCS) of the cement can exceed 60 MPa when a reasonable mix proportion is adopted. The hydration products and strength formation mechanism of the PBG cement were assessed using XRD-Rietveld and SEM-EDS. The micro-analysis results indicated that the main hydration products were dihydrate phosphogypsum, ettringite, and CSH gel, which jointly provided the strength for the PBG cement. The PBG cement may improve the utilisation prospects of PG waste.
Development and optimization of phosphogypsum-based geopolymer cement
Wang, Yongrui (author) / Huo, Hong (author) / Chen, Bing (author) / Cui, Qi (author)
2023-01-28
Article (Journal)
Electronic Resource
English
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