Effects of iron/silicon/magnesium/aluminum on CaO carbonation of CO2 in steel slag-based building materials during carbonation curing

2021 ◽  
Vol 298 ◽  
pp. 123889
Author(s):  
Zhuohui Ma ◽  
Hongqiang Liao ◽  
Li Wang ◽  
Fangqin Cheng
Keyword(s):  
Building Materials ◽  
Steel Slag ◽  
Iron Silicon ◽  
Carbonation Curing

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 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 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>

scholarly journals Effect of Different Hydration Time on Carbonation Degree and Strength of Steel Slag Specimens Containing Zeolite

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3898
Author(s):  
Xiong Zhang ◽  
Jun Chang
Keyword(s):  
Compressive Strength ◽  
Steel Slag ◽  
Pozzolanic Reaction ◽  
Test Methods ◽  
New Mineral ◽  
Curing Time ◽  
Hydration Time ◽  
Carbonation Process ◽  
Substitution Ratio ◽  
Carbonation Curing

Steel slag partially substituted by zeolite (SZ) was beneficial for improving the compressive strength and carbonation degree of SZ specimens after a combined curing (hydration and then carbonation) process due to pozzolanic reaction between them. By previous work results, the zeolitic substitution ratios of 5 wt.% and 15 wt.% in steel slag specimens (SZ5 and SZ15) gained the optimum compressive strength and carbonation degree, respectively, after 1 day hydration and then 2 h carbonation. This study investigated the effect of previous hydration time (1, 3, 7, 14, and 196 days) on carbonation degree and strength of SZ specimens after subsequent carbonation curing. Two zeolitic substitution ratios (5 wt.% and 15 wt.%) were selected and pure steel slag specimens were also prepared as controls. Compressive strength results revealed that the optimum hydration curing time was 1 day and the optimum zeolitic substitution ratio was 5 wt.%. The pozzolanic reaction happened in SZ specimens was divided into early and late pozzolanic reaction. In the late hydration, a new mineral, monocarboaluminate (AFmc) was produced in SZ15 specimens, modifying the carbonation degree and strength further. And the mechanism of pozzolanic reaction in early and late hydration in SZ specimens was explained by several microscopic test methods.

The Activation of Steel Slag and its Application in Construction and Building Materials

2014 ◽  
Vol 884-885 ◽  
pp. 702-705 ◽  
Author(s):  
Lan Lan Li ◽  
Feng Qing Zhao ◽  
Shao Jie Liu
Keyword(s):  
Building Materials ◽  
Steel Slag ◽  
Concrete Block ◽  
Cement Clinker ◽  
Research Progress ◽  
Hydration Reaction ◽  
Crude Steel ◽  
Volume Stability ◽  
Industrial Solid Waste ◽  
Combined Use

Steel slag as the discharged residue during steelmaking process is a kind of industrial solid waste, accounting for about 15 to 20 percent of crude steel in production. Steel slag is mainly similar with cement clinker in mineral and chemical composition, and possesses potential hydration reaction activity. The properties of steel slag, the research progress of activation and volume stability were summarized in this paper. Several approaches of steel slag utilization in construction and building materials were introduced. The combined use of various activation methods and proper treatment will increase the volume of steel slag in autoclaved tailings bricks and aerated concrete block.

scholarly journals Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

2021 ◽  
Vol 9 ◽  
Author(s):  
Yaojun Liu ◽  
Jingrui Fang ◽  
Songhui Liu ◽  
Xiaopeng An ◽  
Yanwen Kang ◽  
...  
Keyword(s):  
Steel Slag ◽  
High Volume ◽  
Accelerated Carbonation ◽  
Silicate Structure ◽  
The Matrix ◽  
Curing Methods ◽  
Chemical States ◽  
Eaf Slag ◽  
Carbonation Curing

Carbonation is an effective method to promote the quality of the steel slag binder. In this article, two carbonation approaches, namely hot-stage carbonation and accelerated carbonation, were employed to leach the metals, and the influence mechanism on the metal sequential leachability of the binders composed of 80 wt% of EAF slag incorporating 20 wt% of Portland cement (PC) was revealed. The carbonate products, microstructures, and chemical states were investigated, and the results indicated that chromium, vanadium, and titanium gradually transformed into inactive phases after two carbonation approaches, while zinc appeared the opposite trend. The sequential leachability of chromium declined with the increase of the carbonation efficiency, in which the exchangeable chromium decreased from 1.99 mg/kg in the A2A binder to below the detection limit in the A2C binder and C2C binder. Hot-stage carbonation treatment facilitated particle agglomeration, minerals remodeling, and calcite formation. The carbonation curing of the steel slag paste resulted in the formation of amorphous CaCO3, calcite crystalline and Si-bearing hydrates that covered the pores of the matrix, and silicate structure with a higher disorder. The hot-stage carbonation and accelerated carbonation curing methods were adopted to jointly prevent the leaching of harmful metals and facilitate promising high-volume steel slag-based binders with structural densification and CO2 storage.

Carbonation of steel slag and gypsum for building materials and associated reaction mechanisms

2019 ◽  
Vol 125 ◽  
pp. 105893 ◽  
Author(s):  
Xue Wang ◽  
Wen Ni ◽  
Jiajie Li ◽  
Siqi Zhang ◽  
Michael Hitch ◽  
...  
Keyword(s):  
Reaction Mechanisms ◽  
Building Materials ◽  
Steel Slag

The Properties of Steel Slag Bricks Prepared by both Alkali Activation and Accelerated Carbonation

2012 ◽  
Vol 509 ◽  
pp. 113-118 ◽  
Author(s):  
Wen Sheng Zhang ◽  
Di Shi ◽  
Zhong Jun Shao ◽  
Jia Yuan Ye ◽  
Yuan Wang
Keyword(s):  
Compressive Strength ◽  
Dominant Role ◽  
Steel Slag ◽  
Alkali Activation ◽  
Accelerated Carbonation ◽  
Mineral Compositions ◽  
Physical And Chemical ◽  
Carbonation Curing

The physical and chemical evolutions, including strength, porosity, chemical and mineral compositions, of properties of steel slag bricks prepared by both alkali activation and accelerated carbonation were investigated. The results show that alkali activation provides the initial properties, while accelerated carbonation plays a dominant role in such final performances as strength, porosity, chemical and mineral compositions of steel slag bricks. The steel slag bricks with a compressive strength of 33.8MPa, carbonation degree of 8.92% and porosity of 23.25% were successfully prepared after accelerated carbonation curing (T=50°C, RH=60%, P=0.25MPa, ρCO2=80% by volume) for 120min.

scholarly journals Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2304 ◽  
Author(s):  
Nikolai Lyubomirskiy ◽  
Aleksandr Bakhtin ◽  
Stanisław Fic ◽  
Małgorzata Szafraniec ◽  
Tamara Bakhtinа
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Construction Materials ◽  
Co2 Concentration ◽  
Optimization Methods ◽  
Accelerated Carbonation ◽  
Secondary Raw Materials ◽  
Production Wastes ◽  
Limestone Dust ◽  
Carbonation Curing

The article is dedicated to the research and development of intensive methods for curing products by capturing and binding CO2. It aims to improve and increase the productivity of technologies for the production of artificially carbonated building materials and products. Soda production wastes, limestone dust and finely dispersed limestone dust were used as the research objects. Secondary raw materials have been investigated using modern methods of phase composition and granulometry test. Intensive methods of production of accelerated carbonation of systems consisting of soda wastes were tested using multi-parameter optimization methods. The effects of recycled lime materials on the strength and hydrophysical properties of the obtained material were determined. The secondary raw materials effect depended on the composition of the raw mixture, molding conditions, CO2 concentration applied to the carbonate curing chamber, and the duration of exposure to environments with high CO2 content. It was found that the most effective way of providing accelerated carbonation curing of construction materials and products is a combined carbonation method, combining the principles of dynamic and static methods. It was concluded that the optimal CO2 concentration in the gas-air mixtures used for carbonate curing is 30%–40%.

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