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Alkali Earth + Steel Slag = Permanent Carbon Removal. Simple. ... After we deploy our aggregates, they begin to react passively and remove CO₂ without additional energy inputs. Low Cost. We use an industrial byproduct to capture …
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Pretreatment of alkali activation and carbonation of steel …
Steel slag (SS) exhibits low hydration activities and expansive phases, which should be pretreated prior to using as binding materials. Thus, these properties of SS were …
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Effect of Steel Slag on the Properties of Alkali-Activated Slag
Increasing Ms increases the compressive strength and improves the pore structure, and it significantly increases the drying shrinkage of all samples. This study provides theoretical guidance for the application of steel slag in the alkali-activated slag material.
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Effect of Steel Slag on Hydration Kinetics and Rheological …
It is elucidated that SS and slag react rapidly under alkali activation conditions from 30 min to 90 min at 0.5 Ms. The addition of SS or FA reduces the fluidity loss rate of AAS paste at 30 min …
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Utilization of steel slag in air pollution and greenhouse gas …
Qiu et al. [8] carried out experiments of sodium hydroxide - steel slag double alkali method of sintered flue gas desulfurization in a bubbling reactor, ... and found that the desulfurization reaction of steel slag is carried out on the surface of steel slag, the desulfurization capacity is not high, and the desulfurization capacity of steel ...
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Mechanical properties and durability of alkali-activated steel slag
Alkali-activated cement (AAC) is either clinker-less or free, and it is also environmentally friendly due to its low carbon footprint and wide range sources. Industrial wastes, like steel slag and blastfurnace slag, usually have latent hydraulic reactivity, and can be used as precursors of AAC. Both clinkerless and clinker-free AAC were prepared from the mixture of …
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Synthesis and Morphology of Slag-based Alkali-Activated …
The high amorphous content of slag (appr. 98 wt.%) will therefore have a similar composition as the bulk presented in Table 1.The slag thus provides a large fraction of …
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Effect of carbide slag and steel slag as alkali activators on …
In this study, slag (GGBS) was utilized as the primary material, phosphogypsum (PG) as the sulfat activator, and carbide slag (CS) and steel slag (SS) as the alkali activators to prepare carbide slag-steel slag-slag-phosphogypsum …
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Advances in Understanding the Alkali-Activated …
They found that alkali-activated steel slag has a faster reaction, fewer hydration products, poorer crystallization of Ca(OH) 2, a lower Ca/Si ratio, and a similar Al/Si ratio of gels than Portland cement .
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Effects of high-temperature curing on hydration and …
Compared to the raw materials of steel slag, the diffraction peaks of C 3 S and C 2 S in the XRD spectrum of alkali activated steel slag system are significantly reduced. Previous studies have shown that Ca(OH) 2 in the hydration products of alkali-activated steel slag system is formed through the hydration of C 3 S and β-C 2 S ( Wang and Yan ...
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Investigations on Alkali-Activated Slag/Fly Ash Concrete …
Investigations on Alkali-Activated Slag/Fly Ash Concrete with steel slag coarse aggregate for pavement structures, International Journal of Pavement Engineering, 18:6, 500-512, DOI: 10.1080 ...
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Effect of Steel Slag on the Properties of Alkali-Activated Slag
Increasing Ms increases the compressive strength and improves the pore structure, and it significantly increases the drying shrinkage of all samples. This study provides theoretical …
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Study on the Characteristics of Crystal Formation and
Strong-alkali activation is a prerequisite needed to ensure the full polymerization activity of alkali slag binder and establish excellent mechanical properties; however, it …
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Alkali Activation of Metallurgical Slags: Reactivity, Chemical …
In the present study, the electric arc furnace carbon or stainless steel slag (EAF) and secondary metallurgical slag such as ladle furnace basic slag (LS) were used as …
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Alkali Metals Reactions | Reactivity | Group IA Elements
Acids and alkali metals reaction. Alkali metals react with strong acids (HCl, HNO 3, H 2 SO 4) and emit hydrogen gas and produce relevant alkali metal salt. 2Na + 2HCl = 2NaCl + H 2. 2K + H 2 SO 4 = K 2 SO 4 + H 2. Hydrogen and alkali metals reaction. Metal hydrides (H-) are given as products. 2Na + H 2 = 2NaH. Those ionic hydrides have H-ions.
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Advances in Understanding the Alkali-Activated Metallurgical Slag
They found that alkali-activated steel slag has a faster reaction, fewer hydration products, poorer crystallization of Ca(OH) 2, a lower Ca/Si ratio, and a similar Al/Si ratio of gels than Portland cement .
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Influence of slag composition on the stability of steel in alkali
The aim of this work is to study the corrosion of steel in alkali-activated blast furnace slag and in a modified alkali activated mortar system (blast furnace slag + 10% SiMn slag), to determine the influence of the variation of the redox potential on the stability of steel passivation under exposure to alkaline and alkaline chloride-rich ...
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Alkali Activation of Metallurgical Slags: Reactivity, Chemical …
In the present study, the electric arc furnace carbon or stainless steel slag (EAF) and secondary metallurgical slag such as ladle furnace basic slag (LS) were used as precursors in alkali-activation process to obtain chemically stable solid manufacts.
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Effect of carbide slag and steel slag as alkali activators on the …
In this study, slag (GGBS) was utilized as the primary material, phosphogypsum (PG) as the sulfat activator, and carbide slag (CS) and steel slag (SS) as the alkali activators …
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Steel corrosion in alkali-activated materials and concretes
Shishir Mundra obtained his M.Eng. and Ph. D. at the Department of Materials Science and Engineering at University of Sheffield. His Ph. D. thesis was titled "Corrosion of steel in alkali-activated materials".. In 2018, he moved to the Federal Institute for Materials Research and T esting (BAM), Germany, and worked on developing an electrochemical re-alkalisation …
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Study on the Characteristics of Crystal Formation and
Strong-alkali activation is a prerequisite needed to ensure the full polymerization activity of alkali slag binder and establish excellent mechanical properties; however, it substantially increases the preparation cost. In this study, the effects of both strong and weak alkaline activators on the activation performance of alkali slag were examined, using a …
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Synthesis and Morphology of Slag-based Alkali-Activated …
The high amorphous content of slag (appr. 98 wt.%) will therefore have a similar composition as the bulk presented in Table 1.The slag thus provides a large fraction of reactive Si, Al, Fe, and Ca, indicating that it has a large potential for alkali activation [34, 35].The speciation of iron in this amorphous phase is expected to be Fe 2+ due to the atmospheric conditions …
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Steel slag for carbon fixation and synthesis of alkali-activated
Alkali-activated material is synthesized using carbonated steel slag. Mix-design dominates the mechanical property of synthesized AAM. Synthesized AAM possesses …
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Alkali Activation of Metallurgical Slags: Reactivity, Chemical …
In the present study, the electric arc furnace carbon or stainless steel slag (EAF) and secondary metallurgical slag such as ladle furnace basic slag (LS) were used as precursors in an alkali-activation process. EAF slag, with its amorphous fraction of about 56%, presented higher contents of soluble Si and Al species with respect to ladle slag ...
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Effect of Steel Slag on Hydration Kinetics and Rheological …
It is elucidated that SS and slag react rapidly under alkali activation conditions from 30 min to 90 min at 0.5 Ms. The addition of SS or FA reduces the fluidity loss rate of AAS paste at 30 min and 90 min regardless of the w/b ratio of 0.4 or 0.5 at 1.0 Ms ( Figure 6 b).
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Characterisation of alkali-activated stainless steel slag and …
In the current study, electric arc furnace stainless steel slag (EAFSS) as a potential precursor in the production of alkali activated materials (AAMs) is investigated, along and alternatively to the use of ground granulated blast-furnace slag (GGBFS).
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Study on the performance and reaction mechanism of alkali …
Song [24] attempts were made to alkali-activate fly ash-steel slag, and it was found that when the substitution rate of steel slag for fly ash was between 20%− 50%, the compressive strength at 28 days decreased significantly with increasing substitution rate. ... which provides a calcium source for the reaction. Mixing steel slag powder with ...
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Pretreatment of alkali activation and carbonation of steel slag …
Steel slag (SS) exhibits low hydration activities and expansive phases, which should be pretreated prior to using as binding materials. Thus, these properties of SS were improved through a combined treatment of alkali and then wet carbonation (A_C) in this study.
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Advances in Understanding the Alkali-Activated Metallurgical Slag
Therefore, it should have different inorganic polymerization mechanisms between alkali-activated steel slag materials and alkali-activated amorphous slag materials. Although few in number, some publications regarding the exploration of the reaction mechanism of steel slag in the production of alkali-activated materials do exist in literature.
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Steel slag for carbon fixation and synthesis of alkali …
Alkali-activated material is synthesized using carbonated steel slag. Mix-design dominates the mechanical property of synthesized AAM. Synthesized AAM possesses compact and dense microstructure. C A S H is the main reaction product of synthesized AAM.
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