Mortar Designed from Red Mud with Iron Tailings and Moulded by 3D Printing

A specific mortar material (abbreviated as RFT) was designed from industrial solid wastes, such as red mud, fly ash, and iron tailings. It was mainly developed for 3D printing in this work. Mechanical properties, microstructure and heavy metal leaching properties were discussed. The RFT composed of...

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Bibliographic Details
Published in:Bulletin of environmental contamination and toxicology 2022-07, Vol.109 (1), p.95-100
Main Authors: Zhang, Jiale, Zhang, Na, Yuan, Jianbo, Zhao, Jihan, Zhang, Jiancong, Zhang, Yihe
Format: Article
Language:English
Subjects:
3-D printers
Aggregates
Alkalinity
Aluminum
Aquatic Pollution
Bonding strength
Calcium hydroxide
Calcium silicate hydrate
Cement
Composite materials
Construction materials
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental impact
Ettringite
Fly ash
Gels
Heavy metals
Hydration
Industrial wastes
Iron
Laboratories
Leaching
Mechanical properties
Metals
Mine tailings
Mortars (material)
Mud
Pollution
Printing
Red mud
Reducing agents
Slaked lime
Soil Science & Conservation
Solid wastes
Solidification
Solids
Tailings
Three dimensional printing
Toxicity
Toxicity testing
Toxicology
Waste Water Technology
Water Management
Water Pollution Control
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Summary:A specific mortar material (abbreviated as RFT) was designed from industrial solid wastes, such as red mud, fly ash, and iron tailings. It was mainly developed for 3D printing in this work. Mechanical properties, microstructure and heavy metal leaching properties were discussed. The RFT composed of 15% red mud, 45% iron tailings, 9% fly ash, 30% cement, and 1% FDN water reducing agent attained good mechanical properties. Hydration products including Ca(OH) 2 , ettringite and C-S-H gel were found in RFT through SEM observation. Iron tailings mainly acted as fine aggregates in RFT, and they were wrapped by the C-S-H gels, producing a strong bonding effect between aggregates and cementitious matrix. The leaching toxicity test results proved that the developed RFT mortar materials were environmentally acceptable. Finally, RFT was subjected to a 3D printing test to verify its feasibility as 3D printable construction material.
ISSN:0007-4861
1432-0800
DOI:10.1007/s00128-022-03529-z