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Alkali-activated geopolymer mixture has received a lot of interest since does not incorporate Portland cement binder, where hydrates may be formed by depoly merization or polycondensation reaction ...
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In this work, steel slag is utilized for carbon fixation and the obtained carbonated steel slag (CSS) was creatively adopted as solid precursor for the synthesis of alkali-activated materials (AAMs).
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Slag and fly ash (FA) are mostly used as precursors for the production of alkali-activated materials (AAMs). FA is the waste discharged by power plants, while …
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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 …
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The preparation process of alkali-activated steel slag cementitious material is shown in Fig. 1.The water-binder ratio used for the test was 0.4. The alkali content was 4% and 6% (mass fraction of Na 2 O to total cementitious material), and the modulus of water glass solution was adjusted to 1.0 by adding NaOH. The prepared alkaline …
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The alkali silica reaction (ASR) is a pathological manifestation of chemical origin and high gravity that can negatively affect the mechanical properties and durability of important concrete structures, even with short time in service. ... the attack of sulfates and corrosion of steel. The effectiveness of slag in the ASR mitigation has been ...
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Alkali metals react vigorously to water and air.These elements will dance around, sizzling due to the production of hydrogen gas, and often explode. They get more reactive the further down on the …
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In this study, the characteristics of the alkali-silica reaction (ASR) expansion of steel slag itself, mortar bars, and concrete specimens using steel slag as aggregate are individually investigated by the expansion test method, to determine if steel slag aggregate in concrete can provide volume stability. The results show that when …
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Thus, depending on the type of furnace, steel slag can be broadly classified into three categories, i.e., BOF steel slag, EAF steel slag, and LF steel slag [33]. As for steel slag in alkali ...
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The effects of steel slag (SS) and fly ash (FA) on hydration heat, fluidity, setting time and rheological properties of alkali-activated slag (AAS) pastes with different silicate modulus (Ms) values were …
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The mass loss is only 1.1% and the frost resistance reaches the F300 level. Li et al. compared the durability of alkali-activated steel slag material with Portland cement and found that the frost resistance of alkali-activated steel slag cementitious materials was better than that of Portland cement. The compressive strength loss rate and mass ...
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This study aims to enhance the utilization of clay bricks by maximizing the application of clay brick (CB) powder. The amount of CB was set at 50% and different percentages of steel slag (SS) powder and fly ash (FA) are added. A CB-SS-FA ternary hybrid geopolymer was prepared through alkali activation, and its performance and …
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The influence of low CaO steel slag, calcined clay and granite dust on the alkali-silica reaction was investigated over a period of 35 days under accelerated curing conditions.
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The present investigation explores the potential of alkali-activated slag as a novel method for stabilizing and enhancing the mechanical properties of loose sandy soils. To achieve this, unconfined compression tests were performed on samples with varying slag content, activator solution parameters, and curing conditions. A predictive model …
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Portland cement as a commonly used material in soil stabilization projects, releases considerable amounts of CO2 into the atmosphere, highlighting the need to use green binders such as ground granulated blast furnace slag as a substitute for cement. On the other side, extensive research is being conducted on accelerated carbonation …
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This paper presents results of detailed investigations about the alkaline activation of ground granulated blast furnace slags whose chemical composition were modified. Sodium hydroxide and potassium silicates were used as alkaline activators. The influence of the CaO/SiO2 ratio, the Al2O3 and TiO2 content of the slag composition on …
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Steelmaking slag carbonation mineralization is an effective method for CO2 in-situ fixation. The rate of steelmaking slag carbonation process could be enhanced by adding alkali medium with low ...
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Recently, Zhang et al. studied the effect of the w/b ratio on the carbonation of alkali activated slag/fly ash and found that a decrease in the w/b ratio can reduce the formation rate of Ca ...
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In this study, the effects of the incorporation of various supplementary materials such as fly ash, limestone powder, silica fume, and portland cement as the secondary precursor on the early age reaction, structural buildup, rheology, and microstructure of alkali-activated slag cements (AAC) in the presence of two different …
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(7) was only used in the case of alkali excitation reaction of steel slag. (7) C ‐ S ‐ H (wt. %) = 100 ‐ ∑ (W cryst.) 2.3.3. Heat flow calorimetry. A TAM AIR 8-channel isothermal calorimeter (TA Instruments, USA) was utilized to record the heat flow and the cumulative heat release during the hydration process of SS-cement systems.
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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, …
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Steel slag (SS) exhibits low hydration activities and expansive phases, which should be pretreated prior to using as binding materials. Thus, these properties of …
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All the alkali metals react vigorously with cold water. In each reaction, hydrogen gas is given off and the metal hydroxide is produced.
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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 …
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Thus, depending on the type of furnace, steel slag can be broadly classified into three categories, i.e., BOF steel slag, EAF steel slag, and LF steel slag [33]. As for steel slag in alkali ...
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The alkali silica reaction (ASR) is a pathological manifestation of chemical origin and high gravity that can negatively affect the mechanical properties and durability of important concrete ...
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The present investigation is conducted to evaluate the effect of steel slag coarse aggregates on mechanical properties and fatigue behaviour of Alkali-Activated Slag Fly Ash Concrete (AASFC) mixes. AASFC mixes were prepared with steel slag coarse aggregates by replacing natural coarse aggregates at various replacement levels (0, 25, …
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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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ACR (Alkali-Carbonate Reaction) is a reaction between alkalis in the concrete mortar and the chemical components of carbonate rocks like dolomitic limestones. The reaction causes crystallization and considerable expansion, resulting in substantial damage in a short amount of time.
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The effects of steel slag (SS) and fly ash (FA) on hydration heat, fluidity, setting time and rheological properties of alkali-activated slag (AAS) pastes with different silicate modulus (Ms) values were comparatively investigated. The results show that the incorporation of SS shortens the induction period, increases the cumulative hydration …
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DOI: 10.1016/j.conbuildmat.2023.134406 Corpus ID: 266063617; Study on the performance and reaction mechanism of alkali-activated clay brick with steel slag and fly ash @article{Liu2024StudyOT, title={Study on the performance and reaction mechanism of alkali-activated clay brick with steel slag and fly ash}, author={YunXiao Liu and Fan …
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All the alkali metals react vigorously with halogens to produce salts, the most industrially important of which are NaCl and KCl. [ 2Na(s) + Cl_2(g) rightarrow 2NaCl(s) nonumber ] Sodium Chloride is used as a preservative for meat and to melt the ice on the roads (via freezing point depression ).
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