Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid

Kang, Suk-Pyo; Hye-Ju, Kang; Lee, Byoungky

doi:10.3390/ma14102641

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…Meanwhile, the values of UCS for the D-3 sample (30% CP) and group E samples (40% CP) show a slight increase. Previous investigations have shown that the strength of the CGFB samples is mainly determined by the cement hydration [30][31][32][33][34]. Generally, the stronger the cement hydration is, the larger the corresponding strength of the CGFB sample is.…”

Section: Uniaxial Compression Test Resultsmentioning

confidence: 99%

Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Yin

Zhu

et al. 2021

Energies

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In this investigation, six groups of cemented coal gangue-fly ash backfill (CGFB) samples with varying amounts of kaolin (0, 10, 20, 30, 40, and 50%) instead of cement are prepared, and their mechanical properties are analyzed using uniaxial compression, acoustic emission, scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The uniaxial compressive strength, peak strain, and elastic modulus of CGFB samples decreased with the kaolin content. The average uniaxial compressive strength, elastic modulus, and peak strain of CGFB samples with 10% amount of kaolin are close to that of CGFB samples with no kaolin. The contribution of kaolin hydration to the strength of CGFB sample is lower than that of cement hydration, and the hydration products such as ettringite and calcium-silicate-hydrate gel decrease, thereby reducing strength, which mainly plays a role in filling pores. The contents of kaolin affect the failure characteristics of CGFB samples, which show tensile failure accompanied by local shear failure, and the failure degree increases with the kaolin content. The porosity of the fracture surface shows a decreasing trend as a whole. When the amount of kaolin instead of cement is 10%, the mechanical properties of CGFB samples are slightly different from those of CGFB samples without kaolin, and CGFB can meet the demand of filling strength. The research results provide a theoretical basis for the application of kaolin admixture in fill mining.

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Section: Uniaxial Compression Test Resultsmentioning

confidence: 99%

Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Yin

Zhu

et al. 2021

Energies

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“…However, this recycling process is complex and economically inefficient. The red mud’s recycling rate has typically stayed within 10% [ 17 ]. In previous studies, liquefied red mud (LRM) was neutralized with sulfuric acid (LRM + S) or nitric acid and was added to cement paste to improve the economic efficiency and recycling rate [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Properties of Red Mud Neutralized with Sulfuric Acid and Effects on Cement Mortar

et al. 2023

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The purpose of this study was to recycle red mud, an industrial byproduct that generates 300,000 tons per year, into the construction industry. Red mud was prepared as a liquid, neutralized with sulfuric acid, and replaced with cement mortar. The properties of liquefied red mud (LRM) neutralized with sulfuric acid (LRM + S) were investigated as well as its effect on cement mortar’s mechanical and hydration characteristics. The pH of LRM + S stabilized at 7.6; its SO3 content was ~4.19% higher than that of LRM. Sulfites were contributed by calcium and sodium sulfate. The flows and setting times of the mortars containing LRM and LRM + S decreased as the substitution rate increased. The compressive strength of mortar that replaced 5% of cement with LRM + S was similar to that of the plain cement mortar. Scanning electron microscopy and X-ray diffraction revealed that the hydration products of LRM + S-containing cement mortar were similar to those of the plain cement mortar. Thus, LRM + S can be used as a cement substitute.

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Insights into the enhanced corrosion resistance of carbon steel in a novel low-carbon concrete with red mud and phytic acid

Zhou

Guan

et al. 2023

Corrosion Science

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Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid

Cited by 3 publications

References 32 publications

Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Properties of Red Mud Neutralized with Sulfuric Acid and Effects on Cement Mortar

Insights into the enhanced corrosion resistance of carbon steel in a novel low-carbon concrete with red mud and phytic acid

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