Morphological and mineralogical insights into acetic acid modifying and hydraulic process on steel slag for enhanced reactivity

Huo, Binbin; Li, Baoliang; Chen, Chun; Zhang, Yamei; Wang, Dongmin

doi:10.1016/j.conbuildmat.2021.125004

Cited by 20 publications

(7 citation statements)

References 43 publications

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“…This phenomenon conformed to surface morphology in Figure 5w–x. Based on a comparison of rates of autoclave expansion rates and surface morphology, between specimens of groups B and D, it can be said that acid activation can improve the soundness of specimens effectively 43,44 …”

Section: Resultsmentioning

confidence: 99%

“…The dead-burnt CaO develops completely and its crystal body is big, with low porosity and large volume density. [42][43][44] The dead-burnt CaO is finally wrapped in solid solution, which results in volume instability of steel slag.…”

Section: Meso-structural Analysis Of Steel Slag Sections After Acid A...mentioning

confidence: 99%

“…The limestone which has not been reacted in time forms dead‐burnt CaO through high‐temperature calcination in the steel furnace. The dead‐burnt CaO develops completely and its crystal body is big, with low porosity and large volume density 42–44 . The dead‐burnt CaO is finally wrapped in solid solution, which results in volume instability of steel slag.…”

Section: Mechanism Analysismentioning

confidence: 99%

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Effect of acid‐activation on CaO existential state and reactive properties of hot‐splashed steel slag in cement‐based materials

Zhou

Zhang

et al. 2022

Structural Concrete

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The over-burnt free-CaO(f-CaO) existential state in hot-splashed steel slag is understood by observing the microstructure of steel slag section and analyzing the minerals in the steel slag (SS). In the investigation, a new method of using hydrochloric acid as the solvent to modify the steel slag powder (SSP) is put forward. The effects of hydrochloric acid pretreatment on the surface morphology of SS and the hydration activity and soundness of SSP blended cement are investigated. Furthermore, the failure mechanism of steel slag cement-based materials and the hydration mechanism of acid-activated steel slag (ASS) are discussed in detail. The research indicated that the optimum dosage of modified SSP is 20 wt%. At this dosage, the 7-and 28-day compressive strength of paste is nearly increased 15% compared with the untreated steel slag cementbased mortar specimens. Moreover, the acid activated SS-blended cement pastes show much better soundness performances after autoclaved curing tests when compared with corresponding pastes with SS without treatment. It provides a promising approach for efficient and safe utilization of SS as supplementary cementitious material.

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Section: Resultsmentioning

confidence: 99%

Section: Meso-structural Analysis Of Steel Slag Sections After Acid A...mentioning

confidence: 99%

Section: Mechanism Analysismentioning

confidence: 99%

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Effect of acid‐activation on CaO existential state and reactive properties of hot‐splashed steel slag in cement‐based materials

Zhou

Zhang

et al. 2022

Structural Concrete

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“…[151][152][153][154] The functional groups on the surface of activated carbon are oxygen-containing functional groups, such as hydroxyl, carboxyl, carbonyl and lactone groups, which are introduced through the oxidation pathway. [155][156][157] The introduction of carboxyl groups on the surface of biomass-derived activated carbon will play an important role in the adsorption of metal ions. The hydrogen in the carboxyl group will be ionexchanged by metal ions, and the carboxyl group will chelate with metal ions.…”

Section: Modication Of Biomass-derived Activated Carbonmentioning

confidence: 99%

Adsorption of heavy metal onto biomass-derived activated carbon: review

et al. 2023

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“…According to Huo et al (2020) and Huo et al (2021b), the surface roughness of SS and VTS modified by CPA, increases the SSA and porosity of the powder, which makes it easier for the surface of the powder to absorb water molecules. Meanwhile, water molecules can enter the interior of the powder particles through pore channels, which enables the active minerals in SS and VTS to have more contact with water molecules.…”

Section: Effect Of Cpa Content On the Properties Of Cpbmmentioning

confidence: 99%

Properties and microstructure of total tailings cemented paste backfill material containing mining and metallurgical solid waste

Wang

Jing

et al. 2023

Front. Earth Sci.

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Introduction: In order to improve the utilization efficiency of industrial waste discharged in the process of iron and steel metallurgy, a kind of material that can replace cement for mine filling is sought. In the test, steel slag (SS) and vanadium-titanium slag (VTS) were used as the primary raw materials to prepare cementing agents (CA). Then, combine it with vanadium-titanium iron ore tailings (VTIOTs) to make mine cemented paste backfill material (CPBM).Methods: The composition, properties and hydration mechanism of CPBM are studied through various tests, in-cluding mechanical property test, hydration heat test, X-ray diffraction (XRD), scanning electronic mi-croscopy (SEM), and fourier transform-infrared spectroscopy (FT-IR).Results: The results show that when the following conditions are met, the slump is 216 mm, and the 28-day flexural strength and compressive strength of CPBM reach 4.25 and 9.41 MPa, respectively, which meets the requirements of Chinese National Standard GB/T 39489-2020 Technical specification for the total tailings paste backfill: the mass percentage SS: VTS: phosphogypsum (PG): dicyandiamide waste slag (DWS) = 31:59:6:4; the content of compound phosphoric acid (CPA) accounts for 4% of the dry material; the cement sand ratio of CPBM is 1:4; the paste mass concentration (PMC) is 80%; and the content of water reducing agent (WRA) is 0.18%.Discussion: Mechanism studies show that the hydration product of the CA is mainly ettringite (AFt) and C-S-H gel. The addition of CPA promotes the hydration of active minerals in SS and VTS. The existence of PG pro-motes the formation of AFt, and the formation of AFt further promotes the fracture of [AlO4]5− and [SiO4]4− along the bridge oxygen in VTS and SS.

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Morphological and mineralogical insights into acetic acid modifying and hydraulic process on steel slag for enhanced reactivity

Cited by 20 publications

References 43 publications

Effect of acid‐activation on CaO existential state and reactive properties of hot‐splashed steel slag in cement‐based materials

Effect of acid‐activation on CaO existential state and reactive properties of hot‐splashed steel slag in cement‐based materials

Adsorption of heavy metal onto biomass-derived activated carbon: review

Properties and microstructure of total tailings cemented paste backfill material containing mining and metallurgical solid waste

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