Variables assessed included slag composition, coke mineralogy and channel diameter. The interactions between ordinary Portland cement or calcium oxide and each slag were investigated by X-ray diffraction, scanning electron microscopy, and thermoanalysis. The results indicate that the durability of slag concrete is acceptable, though slightly lower than that of conventional concrete. Stainless steel is also used as a finish for refrigerators, freezers, countertops and dishwashers.Stainless steel is ideal for food production and storage as it does not affect the flavor of the food. Its utilization in cementitious matrices as a cement surrogate has been the most suitable application because of its potential pozzolanic properties. Conversely, the typical chemical and physical properties of EAF slag, such as the high content in calcium and magnesium oxides inclined to hydration, may be a limit for the durability of the resulting concrete: on one hand the durability can be strongly improved even in critical freezing/thawing environmental conditions by a small amount of air-entraining agent, on the other hand, this conglomerate still remains rather vulnerable to repeated cycles of wetting and drying. This paper provides a complete characterization and quantification of BOF slag phases in order to better understand their potential hydraulic activity. From: Carbon Dioxide Sequestration in Cementitious Construction Materials, 2018. Further studies are required, especially with respect to durability. At voestalpine the slags resulting from the steelmaking process are separated into blast furnace and metallurgical slags and then recycled. Weaker aggregates tend to produce a more ductile concrete than stronger aggregates do. Dissolution test showed that only a very small amount of EAF or AOD is dissolved in water, but in 1 M HCl solution, as high as 23.68% EAF and 31.04% AOD are dissolved, respectively. in the 1950s, first by applying oxygen top-blowing through lance and little later as oxygen bottom-blowing through nozzles. Comparison of the SEM images and test results show that chemical and physical properties of GBFS and BA are the main factors affecting the concrete durability. Also, ternary blend mix showed higher resistance than binary blend specimens. In this study, the influence of varying the amount of cement replaced by waste glass on several mechanical properties considered essential to ensuring the performance of mortars in structural repair, such as compressive strength, modulus of elasticity, linear shrinkage and tensile bond strength, was analyzed. To do this, the slag obtained in the steelmaking process must be crushed and stabilized. result, the properties of the fresh concrete, compressive strength, durability have been improved. LD slag has been successfully used in Austria since the 1970s. As an alloying element, nickel enhances its important properties such as formability, weldability and ductility, while increasing corrosion resistance in certain applications. Hydration tests under water showed a pastes swelling due to the hydration of CaO contained in BOF slags. Particle size growth of the ground EAF is not obvious, indicating that the hydraulic property of AOD is higher than EAF. In the present paper, physicochemical and mineralogical properties of stainless steel slags oriented to metal recovery were studied by using various methods. Long-term properties of concrete containing ground granulated blast furnace slag and steel slag, Flow of Molten Slag through Coke Channels, Durability of concrete incorporating non-ground blast furnace slag and bottom ash as fine aggregate, Feasibility of stabilizing expanding property of furnace slag by autoclave method, Anomalous water transport properties of Portland and blended cement-based materials, Development of dusting prevention stabilizer for stainless steel slag, Use of Granulated Blast-Furnace Slag in Concrete as Fine Aggregate. The BOF slag variability is investigated on several samples with different origins and ages.BOF slag with different origins mainly contain 38â52% C2S, 20â30% C2F, 1â7% Ca(OH)2, 11â13% Fe1âxO, 2â8% CaO. The criteria can be used as guidance and specification for the use of steel slag and other expansion-prone nonferrous slags, copper, nickel for instance as a granular material in highway construction. Strength and durability characteristics of concrete were compared with respect to control samples and vice versa. Results showed that lime is present under two forms in slag grains: some nodules observed in the matrix whose size ranges from 20 to 100 μm and some micro-inclusions, enclosed in the heterogeneous calcium silicate phase whose size ranges from 1 to 3 μm. It was concluded that the non-ground-granulated blast-furnace slag can be used as fine aggregate under some conditions. In order to accomplish this objective, fuzzy modeling was employed in this study in order to control some variables related to the BOF process. The focus is always on stories about voestalpine employees, projects and products. Electric arc furnace (EAF) slag, a by-product of steelmaking recovered after the oxidizing process, is useful when employed as aggregate in hydraulic concrete and bituminous mixtures. Because crude oil is highly corrosive, steel is ideal for use in the construction of oil rigs. The stainless steel slag contains chromium and iron as well as significant levels of heavy metals, such as Cr(VI). Heavy work is carried out down to 1050°Cand a light finish is applied to the bottom of the range. In contrast, natural rock becomes smooth with wear—its surface becomes polished and slippery. Download as PDF. The most common use is as an aggregate in the manufacture of asphalt. Steel slags have been produced and used successfully in different European countries as a road construction material because of their advantageous technical properties. The aim of this study was to couple several analytical techniques in order to carefully undertake chemical and mineralogical characterizations of LD steel slags and identify the phases that are expected to be responsible for their instability. The use of waste glass incorporated into construction materials has been the focus of several studies. Eventually the criterion (relationship) is established based on the free lime content, the specific gravity and bulk relative gravity of a specific steel slag sample. Steel slag is a mineral byproduct generated during steel production. This method can be easily industrialized. Pour ces cas, les courbes d'expansion ne sont vraisemblablement pas seulement dues à de l'alcali-réaction et la poursuite de l'expansion est probablement révélatrice d'un comportement gonflant que manifeste le béton, indépendamment de toute réaction pathologique, par le seul fait qu'il est placé dans une atmosphère saturée en humidité. Four types of steel slags, a ladle slag, a BOF (basic oxygen furnace) slag and two different EAF (electric arc furnace) slags, were characterized and modified by semi-rapid cooling in crucibles and rapid cooling by water granulation. The lowest split tensile strength was noted in the calcareous limestone aggregate concrete. Considering that this swelling is not negligible compared to the limit expansions fixed by standard AAR tests (2Ã10â4 at 90 days for the French performance test), it becomes important to evaluate it in order to avoid the inappropriate rejection of an aggregate.RésuméL'exploitation de plusieurs résultats à longue durée de gonflement des bétons soumis à des tests accélérés d'alcali-réaction montre que, dans certains cas, l'expansion continue bien après que l'alcali-réaction ait stoppé. A usability criterion is then developed based on the volume expansion of steel slag (%) and the minimum percentage of the volume that can take the volume expansion of steel slag (%). Six mixes were designed: four concretes made with EAF slags, one conventional concrete, and one heavyweight concrete with barite aggregates. Although there were negligible deviations from the target values, most of the fuzzy results obtained using MATLAB-Fuzzy Logic Toolbox version 5.0 were found to be acceptable. As the slag … To minimize the oxidation of chromium, the oxidation potential must be controlled and decreased along the lowering carbon content. Slags are one of the most natural products of all. Due to adequate properties of all concretes found in stage 2, length change (during 56weeks), sorptivity and high temperature exposure evaluation were also determined. Her stories give insights into the world of the voestalpine Group. This paper details a systematic study of slag concrete behaviour under severe test conditions. It is proved that they correlated well. The solidification of a multicomponent stainless steel slag and dust composite has been studied by thermodynamic calculations using Factsage and analyses of samples using EPMA and Rietveld refinement of synchrotron X-ray powder diffraction after various cooling rates. This can be done by diluting oxygen with inert gas, Ar/N2 as is done in AOD process or by decreasing the total pressure by vacuum. 5 by adding quartz sand, disintegrating of slag was prevented. Australia: Boral Australia has launched Innovo, an asphalt system product that uses steel slag as a raw material amongst other recyclables. Although the attenuation coefficients of the concretes with EAF slags are lower than that of concrete with barite, the differences in terms of the equivalent wall thickness are relatively small. Influence of particle size on the carbonation of stainless steel slag for CO2 storage, Dust formation in Electric Arc Furnace: Birth of the particles, L'approche performantielle de la durabilité des bétons, Mechanism and Prevention of Disintegration of AOD Stainless Steel Slag, Effects of BOF steel slag and other cementitious materials on the rheological properties of self-compacting cement pastes, Béton de structure à propriétés dâisolation thermique améliorées : approche expérimentale, Radiological protection and mechanical properties of concretes with EAF steel slags, Properties of hydraulic paste of basic oxygen furnace slag, Characterization and activation of Basic Oxygen Furnace slag, Properties of concrete using metallurgical industrial by-products as aggregates, Properties of Blast-Furnace Slags Containing High Amounts of Manganese, Effect of Mechanical Activation on the Hydraulic Properties of Stainless Steel Slags, Chemical and mineralogical characterizations of LD converter steel slags: A multi-analytical techniques approach, Mechanical and durability characteristics of concrete containing EAF slag as aggregate, Bofy-fuzzy logic control for the basic oxygen furnace (BOF), Effect of coarse aggregate quality on the mechanical properties of high strength concrete, Physicochemical and Mineralogical Properties of Stainless Steel Slags Oriented to Metal Recovery, Interpretation of expansion curves of concrete subjected to accelerated alkaliâaggregate reaction (AAR) tests, Comparison of properties of steel slag and crushed limestone aggregate concretes, The use of oil well-derived drilling waste and electric arc furnace slag as alternative raw materials in clinker production, Durability of concrete made with EAF slag as aggregate, Use of steel slag as a granular material: Volume expansion prediction and usability criteria, Products of Steelslags an Opportunity to Save Natural Resources, Characteristic of steel slag under different cooling conditions. Such results support the use of EAF slags as a structural concrete with radiological protection capability. Meanwhile, the ready-mixed concrete with the BFS and the fly ash have become popular in Osaka area. Introduction Each year, approximately fifty millions tons of steel slag is According to their chemical composition they are a valuable mineral resource as additions in certain hydraulic binders. considerable interest in the liquid transport properties of cement-based materials. BOF is a widely preferred and effective steel making method due to its higher productivity and considerably low production cost. The durability performance of both steel slag and crushed limestone aggregate concretes was evaluated by assessing water permeability, pulse velocity, dimensional stability and reinforcement corrosion. Finally, some leaching tests were carried out in order to verify their environmental compatibility. However, slags can contain metal sulfides and elemental metals. 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Dumped in landfills mortar must be controlled and decreased along the lowering carbon.... Results with the BFS and the interactions between ordinary Portland cement or binders! Scanning electron microscopy could be applied paper, fuzzy modeling for the food service or medical industries concretes EAF... Separated into blast furnace and metallurgical slags and then recycled seldom exists the... For plants to germinate non-ground-granulated blast-furnace slag can be expected set was selected as inputs from the steelmaking process be...
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