scholarly journals Use of CO2 to Cure Steel Slag and Gypsum-Based Material

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5174
Author(s):  
Xue Wang ◽  
Wen Ni ◽  
Jiajie Li ◽  
Siqi Zhang ◽  
Keqing Li ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Building Materials ◽  
Steel Slag ◽  
Binding Energies ◽  
Strength Development ◽  
Co2 Uptake ◽  
Hydration Products ◽  
Al Content ◽  
High Al Content ◽  
Carbonation Curing

To improve the utilization of steel slag (SS) in CO2 capture and making building materials, the paper mainly discussed the effects of desulphurization gypsum (DG) and w/s ratio on strength development and CO2 capture capability of high Al content SS. It showed that 10 wt% DG enhanced the strength of hydration-curing SS by 262% at 28 days. Similarly, adding 6 wt% DG in carbonation-curing SS contributed to increases in strength and CO2 uptake by 283% and 33.54%, reaching 42.68 MPa and 19.12%, respectively. Strength decreases and CO2 uptake increases with w/s. Microanalysis (QXRD, SEM-EDS, TG-DTG, FTIR, XPS, and MIP) revealed that the main hydration products of SS were C-S-H gel and C4AH13, which transformed to ettringite with DG addition. The carbonation products were mainly calcite and aragonite. Additionally, the amount of aragonite, mechanically weaker than calcite, decreased and calcite increased significantly when DG was added in carbonation-curing samples, providing a denser structure and higher strength than those without DG. Furthermore, high Al 2p binding energies revealed the formation of monocarboaluminate in the DG-added carbonation samples, corresponding to higher CO2 uptake. This study provides guidance for the preparation of SS-DG carbide building materials.

scholarly journals Study on Mineral Compositions of Direct Carbonated Steel Slag by QXRD, TG, FTIR, and XPS

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4489
Author(s):  
Xue Wang ◽  
Wen Ni ◽  
Jiajie Li ◽  
Siqi Zhang ◽  
Keqing Li
Keyword(s):  
Co2 Capture ◽  
Co2 Sequestration ◽  
Orthogonal Design ◽  
Construction Material ◽  
Steel Slag ◽  
Molding Pressure ◽  
Co2 Uptake ◽  
Optimum Conditions ◽  
Water Addition ◽  
Mineral Compositions

Steel slag CO2 sequestration helps mitigate global warming and decrease the stockpile of steel slag (SS). Through orthogonal design tests and single-factor tests, this paper evaluated the effects of the water/solid mass ratio (w/s), gypsum ratio (G/SS), molding pressure, and curing duration on uniaxial compressive strength (UCS) and CO2 uptake of the compacts. The results indicated that high w/s enhanced both strength and CO2 capture ability. The proper addition of gypsum helps promote UCS increase and CO2 uptake of steel slag. In addition, increasing the molding pressure can significantly improve UCS without reducing CO2 uptake. The optimum conditions in the study were a w/s of 0.20, G/SS of 1/16, and molding pressure of 27 MPa, under which conditions 1 d UCS and CO2 uptake were 55.30 MPa and 12.36%, respectively. Microanalyses showed that gypsum activates mainly mayenite in steel slag. An increase in water addition also increased the hydration and carbonation products greatly, and the strengthened molding pressure had a significant densification effect on micro-pore structures. The study gives guidance in the application of steel slag in CO2 capture and manufacturing green construction material.

scholarly journals Study on Strength and Microstructure of Cement-Based Materials Containing Combination Mineral Admixtures

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Meijuan Rao ◽  
Jianpeng Wei ◽  
Zhiyang Gao ◽  
Wei Zhou ◽  
Qiaoling Li ◽  
...  
Keyword(s):  
Testing Machine ◽  
Steel Slag ◽  
Pozzolanic Reaction ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Strength Development ◽  
Hydration Products ◽  
Cement Based Materials ◽  
Aggregate Effect

The compressive strength of complex binders containing two or three blended mineral admixtures in terms of glass powder (GP), limestone powder (LP), and steel slag powder (SP) was determined by a battery solution type compressive testing machine. The morphology and microstructure characteristics of complex binder hydration products were also studied by microscopic analysis methods, such as XRD, TG-DTA, and SEM. The mechanical properties of the cement-based materials were analyzed to reveal the most appropriate mineral admixture type and content. The early sample strength development with GP was very slow, but it rapidly grew at later stages. The micro aggregate effect and pozzolanic reaction mutually occurred in the mineral admixture. In the early stage, the micro aggregate effect reduced paste porosity and the small particles connected with the cement hydration products to enhance its strength. In the later stage, the pozzolanic reaction of some components in the complex powder occurred and consumed part of the calcium hydroxide to form C-S-H gel, thus improving the hydration environment. Also, the produced C-S-H gel made the structure more compact, which improved the structure’s strength.

Strength Development and Products Evolution of β-C2S and γ-C3S Induced by Accelerated Carbonation Curing

2020 ◽  
Vol 35 (6) ◽  
pp. 1053-1060
Author(s):  
Yanfeng Fang ◽  
Zhichao Liu ◽  
Qinghe Wang ◽  
Yuzhuo Zhang ◽  
Miao Zhang ◽  
...  
Keyword(s):  
Strength Development ◽  
Accelerated Carbonation ◽  
Carbonation Curing

scholarly journals Utilization of induction furnace steel slag based iron oxide nanocomposites for antibacterial studies

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
J. Baalamurugan ◽  
V. Ganesh Kumar ◽  
T. Stalin Dhas ◽  
S. Taran ◽  
S. Nalini ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Iron Oxide ◽  
Building Materials ◽  
Induction Furnace ◽  
Micrococcus Luteus ◽  
Bacterial Species ◽  
Steel Slag ◽  
If Steel ◽  
Growth Inhibitory ◽  
Microplate Reader

AbstractMetals and metal oxide-based nanocomposites play a significant role over the control of microbes. In this study, antibacterial activity of iron oxide (Fe2O3) nanocomposites based on induction furnace (IF) steel slag has been carried out. IF steel slag is an industrial by-product generated from secondary steel manufacturing process and has various metal oxides which includes Al2O3 (7.89%), MnO (5.06), CaO (1.49%) and specifically Fe2O3 (14.30%) in higher content along with metalloid SiO2 (66.42). Antibacterial activity of iron oxide nanocomposites has been revealed on bacterial species such as Micrococcus luteus, Bacillus subtilis and Staphylococcus aureus. Micrococcus luteus has undergone maximum zone of inhibition (ZOI) of 12 mm for 10 mg/mL concentration of steel slag iron oxide nanocomposite. Growth inhibitory kinetics of bacterial species has been studied using ELISA microplate reader at 660 nm by varying the concentration of steel slag iron oxide nanocomposites. The results illustrate that IF steel slag is a potential material and can be utilized in building materials to increase the resistance against biodeterioration. Graphic abstract

scholarly journals Correction: Toda, K., et al. Key Factors Affecting Strength Development of Steel Slag-Dredged Soil Mixtures. Minerals 2018, 8(5), 174

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 473
Author(s):  
Kanako Toda ◽  
Haruna Sato ◽  
Nilan Weerakoon ◽  
Tsubasa Otake ◽  
Satoshi Nishimura ◽  
...  
Keyword(s):  
Steel Slag ◽  
Strength Development ◽  
Key Factors ◽  
Factors Affecting ◽  
Dredged Soil ◽  
Soil Mixtures

The authors wish to make the following corrections to this paper [...]

Characterization of Hydration Products’ Formation and Strength Development in Cement-Stabilized Kaolinite Using TG and XRD

2018 ◽  
Vol 30 (10) ◽  
pp. 04018261 ◽  
Author(s):  
Wassim E. Tabet ◽  
Amy B. Cerato ◽  
Andrew S. Elwood Madden ◽  
Rolf E. Jentoft
Keyword(s):  
Strength Development ◽  
Hydration Products

Dielectric properties of anodized Al-Ta alloy films with high Al content

1975 ◽  
Vol 27 (1) ◽  
pp. 111-121 ◽  
Author(s):  
A. Schauer ◽  
M. Roschy ◽  
W. Juergens
Keyword(s):  
Dielectric Properties ◽  
Alloy Films ◽  
Al Content ◽  
High Al Content

scholarly journals Assessing the long term effects on climate change of metallurgical slags valorization as construction material: a comparison between static and dynamic global warming impacts

2021 ◽  
Vol 1 (1) ◽  
pp. 88-111
Author(s):  
Andrea Di Maria ◽  
◽  
Annie Levasseur ◽  
Karel Van Acker ◽  
◽  
...  
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Carbon Footprint ◽  
Building Materials ◽  
Construction Material ◽  
Steel Slag ◽  
Construction Materials ◽  
Long Term Effects ◽  
Stainless Steel Slag ◽  
Environmental Evaluation

<abstract> <p>The interest in circular economy for the construction sector is constantly increasing, and Global Warming Potential (GWP) is often used to assess the carbon footprint of buildings and building materials. However, GWP presents some methodological challenges when assessing the environmental impacts of construction materials. Due to the long life of construction materials, GWP calculation should take into consideration also time-related aspects. However, in the current GWP, any temporal information is lost, making traditional static GWP better suited for retrospective assessment rather than forecasting purposes. Building on this need, this study uses a time-dependent GWP to assess the carbon footprint of two newly developed construction materials, produced through the recycling of industrial residues (stainless steel slag and industrial goethite). The results for both materials are further compared with the results of traditional ordinary Portland cement (OPC) based concrete, presenting similar characteristics. The results of the dynamic GWP (D_GWP) are also compared to the results of traditional static GWP (S_GWP), to see how the methodological development of D_GWP may influence the final environmental evaluation for construction materials. The results show the criticality of the recycling processes, especially in the case of goethite valorization. The analysis shows also that, although the D_GWP did not result in a shift in the ranking between the three materials compared with S_GWP, it provides a clearer picture of emission flows and their effect on climate change over time.</p> </abstract>

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