Effect of ultrafine red mud on the workability and microstructure of blast furnace slag-red mud based geopolymeric grouts

Li, Zhaofeng; You, Hao; Gao, Yifan; Wang, Chuan; Zhang, Jian

doi:10.1016/j.powtec.2021.07.046

Cited by 45 publications

(3 citation statements)

References 28 publications

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“…Actinite (Na 0.15 K 0.04 Ca 1.68 (Fe 1.42 Mg 3.68 )Si 7.38 Al 0.83 O 22 (OH) 2 ) content was 22.3%. For the chemical composition of actinite, the iron content was 9.3% and no hematite or goethite in RM were found in the XRD analysis results, indicating that the hematite and goethite in RM were dissolved in the alkaline medium [ 4 ]. The content of calcite (CaCO 3 ) is 7.8%.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and Strength Formation Mechanism of Calcined Oyster Shell, Red Mud, Slag, and Iron Tailing Composite Cemented Paste Backfill

Sun

2022

Materials

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The use of bulk solid-waste iron tailing (IOT), red mud (RM), and oyster shells to prepare cemented paste backfill (CPB) can effectively solve the ecological problems caused by industrial solid waste storage and improve the utilization rate of such materials. In this study, a new type of CPB was prepared by partially replacing slag with RM, with calcined oyster shell (COS) as the alkaline activator and IOT as aggregate. The central composite design (CCD) method was used to design experiments to predict the effects of the COS dosage, RM substitution rate, solid mass, and aggregate–binder ratio using 28-dUCS, slump, and the cost of CPB. In this way, a regression model was established. The quantum genetic algorithm (QGA) was used to optimize the regression model, and X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS) microscopic tests are performed on CPB samples of different ages with the optimal mix ratio. The results showed that COS is a highly active alkaline substance that provides an alkaline environment for polymerization reactions. In the alkaline medium, the hematite and goethite in RM and quartz in IOT gradually dissolved and participated in the process of polymerization. The main polymerization products of the CPB samples are calcium–silicate–hydrogel (C–S–H), calcium–aluminosilicate–hydrogel (C–A–S–H), and aluminosilicate crystals such as quartz, albite, and foshagite. These products are intertwined and filled in the internal pores of the CPB, enabling the pore contents to decrease and the interiors of the CPB samples to gradually connect into a whole. In this way, the compressive strength is increased.

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Section: Resultsmentioning

confidence: 99%

“…Moreover, as of 2019, the annual output of oyster shells reached 5.23 million tons [ 3 ]. RM is rich in active Al 2 O 3 and SiO 2 , which can be used to prepare cementitious materials after alkali excitation [ 4 ]. Furthermore, the Na 2 O components in RM make the mud alkali-activated [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Strength Formation Mechanism of Calcined Oyster Shell, Red Mud, Slag, and Iron Tailing Composite Cemented Paste Backfill

Sun

2022

Materials

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“…The microstructure characterization results indicated that RM played a filling role in the geopolymerization process, and a reduction of the particle size could increase the reactivity of the RM. In addition, the iron components in ultrafine RM could also have participated in the geopolymerization process [56].…”

Section: Slagsmentioning

confidence: 99%

Synergistically Using Bauxite Residue (Red Mud) and Other Solid Wastes to Manufacture Eco-Friendly Cementitious Materials

Wenliang

Zheng

et al. 2022

Buildings

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Bauxite residue (red mud) is a solid waste resulting from the aluminum production industry. Disposal or landfill of the red mud (RM) poses irreversible environmental problems; therefore, it is compelling to find practical solutions that can mitigate the negative environmental problems of RM stacking storage. In the past decades, although the recycling of RM has achieved significant progress, challenges remain from both academic and practical perspectives. Previous studies have demonstrated that all the aluminosilicate-based solid wastes have pozzolanic activity, and thus can be considered as resources to manufacture eco-friendly cementitious materials to relieve the carbon emission burden. Therefore, combining RM and other solid wastes to manufacture green cementitious materials has become a promising route to alleviate the burden of environmental pollutions. However, challenges from the fluctuation of the chemical compositions, inert activity, heavy metals stabilization, efflorescence, the side effects of the second pollutions from solid wastes, the hydration process, and mutual interaction mechanisms between the various types of solid wastes are still unclear, especially for multi-components RM-based cementitious materials. This review article summarizes the state of the art of mechanical properties, microstructure characterization methodologies, and hydration process and mechanisms of RM along with other solid wastes. The main challenges and future research trends are discussed. This article attempts to summarize the details of the RM recycling technologies that are beneficial to readers in understanding the background knowledge and research methodologies of eco-friendly cementitious materials.

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Study on occurrence form and solidification mechanism of alkaline components in red mud

Gao,

Li,

Zhang

et al. 2023

J Mater Cycles Waste Manag

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Effect of ultrafine red mud on the workability and microstructure of blast furnace slag-red mud based geopolymeric grouts

Cited by 45 publications

References 28 publications

Preparation and Strength Formation Mechanism of Calcined Oyster Shell, Red Mud, Slag, and Iron Tailing Composite Cemented Paste Backfill

Preparation and Strength Formation Mechanism of Calcined Oyster Shell, Red Mud, Slag, and Iron Tailing Composite Cemented Paste Backfill

Synergistically Using Bauxite Residue (Red Mud) and Other Solid Wastes to Manufacture Eco-Friendly Cementitious Materials

Study on occurrence form and solidification mechanism of alkaline components in red mud

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