Strength and durability characteristic of alkali activated GGBS stabilized red mud as geo-material

Alam, Shamshad; Das, Sarat Kumar; Rao, B. Hanumantha

doi:10.1016/j.conbuildmat.2019.03.261

Cited by 138 publications

(32 citation statements)

References 33 publications

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“…The peaks at 896 cm 1 and 482 cm 1 in the ocs were attributed to the bending vibration of Fe-OH-Fe and the peak of Fe-OH/Al-OH respectively, which con rmed that there were still Fe-Al polymers in the ocs. In the FTIR spectrum of the ocs, the two characteristic absorption peaks at 1071 cm 1 and 625 cm 1 were caused by the shift of 1099 cm 1 and 603 cm 1 , respectively, suggesting that Al-OH and Fe-OH in PAFC were involved in the occulation process. FTIR spectra showed that there was occurrence of similar functional groups between PAFC sample and ocs but the relative intensity of transmittance and wavenumber position varied due to physicochemical interaction between ocs and active groups in PAFC (Ghani et al 2017).…”

Section: Ftirmentioning

confidence: 98%

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Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Cheng

Liu

et al. 2021

Preprint

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In this work, red mud was used as raw material to extract Al and Fe with hydrochloric acid. The high-efficiency polyaluminum iron chloride (PAFC) flocculant was prepared via adjusting the pH of the leaching solution, the molar ratio of aluminum and iron, and the polymerization temperature. The effect of synthesis and flocculation conditions on the flocculation performance of aged landfill leachate was investigated. The results confirmed that the PAFC prepared at the polymerization pH of 2.5, the Al/Fe molar ratio of 8, and the polymerization temperature of 70 °C had the optimum flocculation effect. The flocculation consequences of PAFC and commercial polyaluminum iron chloride flocculant (CPAFC) under different flocculation conditions were compared. The chemical oxygen demand (COD), UV254, chroma and settlement height of PAFC at flocculant concentration of 60 g/L and solution pH of 6 were 72.2%, 79.2%, 82.9% and 9.5 cm (within 90 min), respectively. PAFC has excellent flocculation performance and can be used as a simple, potentially low-cost wastewater treatment agent in industrial applications.

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Section: Ftirmentioning

confidence: 98%

“…Red mud (RM) is a strong alkaline solid waste discharged during the production of alumina by the Bayer process (Alam et al 2019). At present, about 1.0-1.5 t of RM is generated from 1 t of alumina production, which is mainly related to the characteristics and production process of bauxite (Khairul et al 2019, Samal et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Cheng

Liu

et al. 2021

Preprint

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“…In addition, there are many reports for the application of red mud in the construction for road traffic. Alam et al [14] used alkaliactivated ground granulated blast furnace slag (GGBS) to stabilize red mud as the geotechnical material and tested its durability in the drying-wetting cycles. e leaching toxicity tests showed that the stabilized red mud was nontoxic.…”

Section: Introductionmentioning

confidence: 99%

Effect of Freezing‐Thawing Cycle on the Mechanical Properties and Micromechanism of Red Mud‐Calcium‐Based Composite Cemented Soil

Hao

Suo

Hao

et al. 2020

Advances in Civil Engineering

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The environmental issues caused by solid waste have become increasingly serious. Adding additive is considered as an effective measure to improve the performance of the cemented soil. Therefore, the feasibility study of solid waste such as red mud and desulfurization gypsum used in composite cemented soil is in urgent demand. In this study, the mechanical properties and durability to freezing-thawing cycle of red mud-calcium-based composite cemented soil (RMCC) were analyzed through compressive strength test, resistivity test, and freezing-thawing cycle test. The action mechanism of RMCC was revealed through a series of X-ray diffraction (XRD) and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS) test. The results show that the optimal red mud content in RMCC is 12%. As the freezing-thawing cycle progresses, the difference in resistivity and pressure sensitivity of RMCC gradually weakens. When the freezing-thawing cycle reaches 7, the pressure sensitivity characteristic of RMCC is lost. The change in resistivity and pressure sensitivity can be used to characterize the damage caused by the freezing-thawing cycle. Combined with XRD and SEM analysis, the presence of minerals such as K2Ca5(SO4)6·H2O and (Ca, Na)2(Si, Al)5O10·3H2O play a key role in fixation of alkali metal elements, and the coordination of CSH gel cementation effect and AFt filling effect has a significant impact on mechanical properties. The study provides an effective way to the utilization of red mud and desulfurization gypsum in subgrade strengthening.

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“…Every year, more than 300 million tons of red mud is producing from the alumina industries in worldwide. The disposal of large quantities of red mud is very difficult and it leads to land, air and water pollution [11]. Because it has high alkaline nature and it contains many hazardous substances like metals and radioactive elements [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The bauxite ore and refining process can influence the amount of red mud comes as a wastage. Many studies are done to use red mud in several industrial products such as ceramic tiles, brick manufacturing, cement production, land reclamation and others [10][11][12][13][14][15]. Also, red mud used in the treatment of waste water and exhaust gas as an adsorbent [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A State of the Art on Red Mud as a Substitutional Cementitious Material

Venkatesh¹,

Madduru²,

Nerella³

2019

ACSM

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Red mud is a highly alkaline solid waste produced from the alumina refinery plants. Every year more than 300 million tons of red mud is producing throughout world. Disposal of a large quantity of red mud is very expensive and it creates contamination of neighbor lands, air and water bodies. Using red mud as a sustainable cementitious material in concrete is highly appreciable, because concrete is a second largest using material after water. Moreover, reduce the negative effect on environment due to red mud disposal as well as cement industries. The present paper conducted a critical review on bayer process of red mud, physical and chemical properties of red mud. And also workability, mechanical, durability and microstructure characterization of red mud when used in concrete as sustainable cementitious material. In the red mud iron oxide and alumina oxide are presented abundantly. Red mud accelerates the heat of hydration in concrete and it leads to strength enhancement in early ages. Increases the quantity of red mud in concrete reduces the workability but increases the strength of concrete. However, the chemical composition of red mud and its particle size helps to improve the durability property of concrete. Red mud offers more capable to arrest the chloride ions and other ions diffusion into concrete. Red mud minimizes the micro cracks and voids present in concrete by its particles size as well as bonding nature with other materials up to certain dosage of red mud used in concrete.

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Strength and durability characteristic of alkali activated GGBS stabilized red mud as geo-material

Cited by 138 publications

References 33 publications

Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Effect of Freezing‐Thawing Cycle on the Mechanical Properties and Micromechanism of Red Mud‐Calcium‐Based Composite Cemented Soil

A State of the Art on Red Mud as a Substitutional Cementitious Material

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