Comprehensive multiphase visualization of steel slag and related research in cement: Detection technology and application

Xu, Yangfan; Lv, Yang‐Yang; Qian, Chunxiang

doi:10.1016/j.conbuildmat.2023.131572

Cited by 14 publications

(5 citation statements)

References 141 publications

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“…Meanwhile, the second group of steel slag specimens was subjected to oven-drying at a temperature of 40 • C for t time to obtain their wet basis weight (M t ). The water content of each specimen was calculated using Equation (1). Throughout the weighing process and water content control procedures, efforts were made to maintain an error margin within ±0.1%.…”

Section: Methodsmentioning

confidence: 99%

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Exploring the Effect of Moisture on CO2 Diffusion and Particle Cementation in Carbonated Steel Slag

Lin,

Chen,

Xiang

et al. 2024

Applied Sciences

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The study of the mechanisms affecting the preparation parameters of carbonated steel slag is of great significance for the development of carbon sequestration materials. In order to elucidate the mechanism of the influence of moisture on CO2 diffusion and particle cementation in steel slag, the effects of different water–solid ratios and water contents on the mechanical properties, carbonation products, and pore structure of steel slag after carbonation were investigated. The results show that increasing the water–solid ratio of steel slag can control the larger initial porosity and improve the carbon sequestration capacity of steel slag, but it will reduce the mechanical properties. The carbonation process relies on pores for CO2 diffusion and also requires a certain level of moisture for Ca2+ dissolution and diffusion. Increasing the water content enhances particle cementation and carbonation capacity in steel slag specimens; however, excessive water hinders CO2 diffusion. Reducing the water content can increase the carbonation depth but may compromise gelling and carbon sequestration ability. Therefore, achieving a balance is crucial in controlling the water content. The compressive strength of the steel slag with suitable moisture and initial porosity can reach 118.7 MPa, and 217.2 kg CO2 eq./t steel slag can be sequestered.

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Section: Methodsmentioning

confidence: 99%

“…Steel slag is a prominent by-product generated during the smelting process in the iron and steel industry, constituting approximately 8-15% of the total crude steel production [1][2][3]. In 2021, global crude steel production reached around 1.952 billion tons, resulting in an annual emission of steel slag exceeding 250 million tons [4].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Effect of Moisture on CO2 Diffusion and Particle Cementation in Carbonated Steel Slag

Lin,

Chen,

Xiang

et al. 2024

Applied Sciences

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“…In the original method [21], the beaker was placed on the magnetic pole surface of a strong magnet for physical separation. Due to the magnetic properties of Fe 3 O 4 , it would adhere to the magnet's surface while non-magnetic impurities were suspended above the mixed liquid and then poured out through horizontal shaking by artificial means.…”

Section: Feasibility Analysismentioning

confidence: 99%

“…Gutteridge W [19] and Hou [20] employed a salicylic acid-methanol (SAM) and potassium hydroxy-sucrose (KOSH) solution to dissolve the silicate phase and mesophase in steel slag, as well as extract the primary RO phase present in steel slag. Xu [21] further investigated the chemical phase analysis method for determining the presence of metal Fe, Fe 3 O 4 , and RO phases in steel slag. The metal Fe content in steel slag was selectively dissolved using iodoethanol, while no other minerals apart from metal Fe were solubilized by this solvent.…”

Section: Introductionmentioning

confidence: 99%

Determination of Fe3O4 Content and Total Nonhydraulic Minerals in Steel Slag

Hou,

Sun,

Wang

et al. 2024

Coatings

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The nonhydraulic minerals (Fe3O4, RO phase, Fe) in slag are important indicators for evaluating the pozzolanic activity and detecting the quality of the slag activation processing technology. Fe3O4 is an important characteristic mineral among the nonhydraulic minerals. In order to accurately assess the pozzolanic activity of steel slag powder and to monitor the quality of the activation process of steel slag powder for separate nonhydraulic minerals, it is imperative to precisely determine the nonhydraulic mineral content within the steel slag. Further refinement and enhancement are required for both the HNO3 dissolution method used in determining Fe3O4 content in steel slag, as well as for the EDTA-DEA-TEA (ethylenediamine tetraacetate sodium-diethylamine-triethanolamine) dissolution method employed in determining total nonhydraulic minerals, due to potential deviations caused by challenging impurity separations. The results show that the content of Fe3O4 is determined by 10%HNO3-20%NaOH-chemical analysis method, which solves the problem that the impurities of refractory materials (quartz, corundum, mullite) and amorphous phase affects the content determination in HNO3 dissolution method. The total amount of nonhydraulic minerals (Fe3O4, RO phase, Fe) was determined by the EDTA-NaOH-TEA dissolution method, which solved the problem that the incomplete dissolution of C2F in the EDTA-DEA-TEA dissolution method affected the content determination. The maximum error between the content determination value and the theoretical calculation value of the two methods is less than 0.50%. The improved Fe3O4 and total nonhydraulic mineral quantification methods are feasible and reliable.

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“…Steel slag is a typical solid waste material with strong alkalinity [17][18][19] and has the potential to be incorporated into asphalt mixtures. Steel slag possesses the characteristics of wear resistance, impact resistance and skid resistance [20].…”

Section: Introductionmentioning

confidence: 99%

Research on the Moisture Stability of Asphalt Mixtures with Three Solid Waste Fillers

Hu,

Chen,

Chen

et al. 2023

Materials

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Widespread interest has been drawn to the use of solid waste fillers as a partial replacement for natural fillers in high-performance asphalt mixtures in recent years. However, variations in the material properties of solid waste fillers remain a problem for the recycling method. To address this issue, the limestone powder in asphalt mixtures was replaced with three solid waste fillers, including steel slag powder, tailings powder and calcium carbide slag powder in this study. The chemical composition of the fillers was first characterized to assess the homogeneity of the material. Then, a dense-graded asphalt mixture (AC) and a stone matrix asphalt (SMA) mixture were designed, produced and characterized for wet stability. The results show that the asphalt mixtures with solid waste fillers were superior to limestone powder (LP) asphalt mixtures in terms of resistance to water damage, and the steel slag powder showed the best improvement in moisture stability of the asphalt mixtures. The optimum substitution of solid waste filler for limestone filler was 25%. With the addition of anti-stripping agents, the moisture stability of the asphalt mixture with limestone filler was also greatly enhanced. On the contrary, a marginal enhancement was observed in the moisture stability of asphalt mixtures using solid waste fillers. Solid waste fillers can be used in asphalt mixtures and have a similar function as that of anti-stripping agents. In summary, the use of solid waste fillers to replace mineral fillers in asphalt mixtures is a reliable, value-added recycling option.

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Comprehensive multiphase visualization of steel slag and related research in cement: Detection technology and application

Cited by 14 publications

References 141 publications

Exploring the Effect of Moisture on CO2 Diffusion and Particle Cementation in Carbonated Steel Slag

Exploring the Effect of Moisture on CO2 Diffusion and Particle Cementation in Carbonated Steel Slag

Determination of Fe3O4 Content and Total Nonhydraulic Minerals in Steel Slag

Research on the Moisture Stability of Asphalt Mixtures with Three Solid Waste Fillers

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