آخرین محصولات
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 ...
Activation kinetic model and mechanisms for alkali-activated slag …
Blast furnace slag is a by-product of steel production and is widely used in the concrete industry. Its main components are CaO, SiO 2, Al 2 O 3 and MgO. In comparison to cement, it contains less CaO, and more SiO 2 and Al 2 O 3, with various ranges of MgO.Blast furnace slag belongs to the group of precursors that can react with an alkali solution to give a …
Study on the performance and reaction mechanism of alkali …
Download Citation | On Jan 1, 2024, YunXiao Liu and others published Study on the performance and reaction mechanism of alkali-activated clay brick with steel slag and fly ash | Find, read and ...
Application of Steel Slag in Road Semi-Rigid Subgrade and …
Research has indicated that alkaline calcium ions generated during the hydration of steel slag can react with silicate ions present in siliceous materials to form C-S-H gel, ... This film effectively prevents direct contact between the alkali metal expansion components of the steel slag and water, thereby achieving the intended control of ...
Mechanisms of efflorescence of alkali-activated slag
The exposed slices were immersed in isopropanol for 7 d to arrest the reaction of slag following the standard [33], and then dried in a vacuum oven at 20 °C until constant weight. Some of the slices were crushed into 4–6 mm pieces for MIP tests using a Micrometrics PoreSizer 9500. ... Alkali metal ion (Na) The Na in efflorescence products ...
How does carbonation of alkali-activated slag and Portland …
Alkali-activated materials, as one of the promising substitutes to Portland cementitious binders, are considered environmentally friendly [1] because of the resourceful repurposing of industrial byproducts (e.g., blast-furnace slag and coal fly ash) into clinkerless binders.Alkali-activated slag (AAS), as the most studied alkali-activated material, shows …
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 ...
Effect of Alkali and Sulfate on the Hydration Characteristic …
Coal gasification slag is an inevitable by-product of the coal gasification process. This paper explored the feasibility of using activators (calcium hydroxide, sodium hydroxide, calcium sulfate, sodium sulfate) to promote the pozzolanic activity of milled coal gasification coarse slags (MCS), and analyzed the effect of alkali and sulfate activators on the hydration …
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 ...
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 ...
Aqueous carbonation of steel slags: A comparative study on …
This study aims to investigate the carbonation mechanisms of three types of steel slags with different SiO 2 and Al 2 O 3 contents: (1) ladle metallurgy furnace (LMF) slag (Al-rich steel slag); (2) electric arc furnace (EAF) slag (Si-rich steel slag); and (3) ladle-arc fusion (LAF) slag (medium-Al content steel slag). The focus is to understand the reaction mechanisms and analyze the …
Understanding the influence of slag fineness and water-to …
Consequently, the "pessimum effect" of slag fineness on the ASR-induced expansion of AAS mortars was due to a combination of reaction rate of slag, porosity, shrinkage, strength, amount of dissolved reactive silica from aggregates, and the competition between the reaction of slag and reactive silica as well as the amount of ASR gel and ...
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 …
Passivation and depassivation of reinforcement steel in alkali
In addition, You et al. [26] demonstrated that as the slag content increased in alkali-activated slag/steel slag pastes, the content of Al 2 O 3 increased from 12 % to 16 % and the amounts of K +, Ca 2 ... S 2− and HS − ions in simulated pore solution of slag-based AAM react with Fe to form Fe-S complexes and reduce the stability of the ...
Study on hydration process of alkali-activated slag cement …
Combined with equations (3−1) to (3−5), it is known that the reaction between the alkali components enhances the alkalinity of the alkali slag slurry system, promoting the destruction, decomposition, and reaggregation of the slag vitreous body, thus making AASC have higher mechanical strength and shorter setting time [21].
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 …
Property Comparison of Alkali-Activated Carbon Steel Slag …
Reaction Mechanism. Steel slag is a Ca–Al–Si material, which undergoes high temperature and rapid cooling processes during formation and contains substantial crystals and metastable vitreous bodies. ... The strength of alkali-activated steel slag cementitious system comes from the hydrate C-(A)-S-H, and Si-rich raw materials are conducive ...
Study on Shrinkage in Alkali-Activated Slag–Fly Ash …
Moreover, it can be produced using industrial waste residues, such as fly ash and steel slag. However, alkali slag cement exhibits cracks at early shrinking, thereby restricting its application and further developments [5,6,7]. Hence, its shrinkage performance, mechanical properties, and compliance with the national standards for the setting ...
Exploration of steel slag by lignin and sodium citrate …
Steel slag is produced globally in huge annual quantities. How to achieve its large-scale utilization is a question that researchers have been exploring. In this work, sodium citrate (SC) was used as a linker to modify Steel slag (SS) with alkali lignin (AL). And steel slag cement cementitious materials (CSS) were prepared with 10% replacement ...
Influence of slag composition on the stability of …
Particularly, it is possible that these could significantly influence the corrosion process of the steel. Two types of alkali-activated slag mortars were prepared in this study: blast furnace ...
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.
Influence of slag composition on the stability of …
Among the minor elements found in metallurgical slags, sulfur and manganese can potentially influence the corrosion process of steel embedded in alkali-activated slag cements, as both are redox-sensitive. Particularly, it is …
Slag Basicity: What Does It Mean?
5) in the slag phase and limit the presence of the impurity in the metal. This idea is extended to the choice of refractories for a process; a "basic" refractory will have limited reaction with a "basic" slag but will dissolve readily into an "acid" slag. However, in slag chemistry literatures, whilst the concept of "basicity ...
How does fly ash mitigate alkali–silica reaction (ASR) in …
When glass is used as supplementary cementitious materials (SCM), the high alkali metal content in the glass can react with reactive silica in aggregates and subsequently cause deleterious ASR ...
Accelerated carbonation of steel slag: A review of methods, …
The carbonation reaction of steel slag is a process that utilizes CO 2 to react with calcium and magnesium minerals present in the slag, ... These bacteria are alkali-resistant bacteria, playing a catalytic and leading role in the carbonation process [82], [83]. On one hand, they catalyze carbonation reactions by secreting enzymes, and on the ...
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 ...
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 …
Bond between alkali-activated steel slag/fly ash lightweight …
The use of steel slag (SS) in alkali-activated cement can reduce the carbon emission and cost of lightweight mortar. The effects of SS on the bond strength and the microstructure of the interface between alkali-activated SS/fly ash (FA) lightweight mortar (ASFm) and concrete substrates was studied.
Carbon sequestration of steel slag and carbonation for activating …
The carbonation degree of steel slag and RO phase increases with the carbonation time. Steel slag can react with CO 2 quickly in a short period of time (first 30 min), while RO phase hardly reacts with CO 2. Steel slag has high carbon sequestration ability, steel slag of 100 g can sequester more than 12 g of CO 2 within a few hours.
Hydration and Compressive Strength of Activated Blast-Furnace Slag
2.1. Materials. The main materials used in this work were converter steel slag (SS) with median particle size of 27.1 μm and basicity of 2.94, and granulated blast-furnace slag (BFS, named as Raw) with median particle size of 15.0 μm, both from Baowu Wuhan Iron and Steel Group Co., Ltd. (Wuhan, China) Different particle sizes of BFS, with median particle size of …
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