Next, several mixes of concrete are designed in order to analyze their strength and properties. These use a combination of electrical and chemical energy to melt down alloyed high grade metal scrap. As a result, tires can grip better on surfaces constructed using LD slag, and this is particularly important on highways and in curves. The slag undergoes phase transformation from β-dicalcium silicate (β-C2S) to γ-dicalcium silicate (γ-C2S) at approximately 500 °C to 450 °C, resulting in slag volume expansion, disintegration, and dust generation. 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 (%). 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. The highest and lowest compressive strength was obtained in the concrete specimens prepared with steel slag and calcareous limestone aggregates, respectively. Due to its positive technical characteristics, LD slag is used all over the world in road and railway construction and for engineering. In an earlier paper  we showed that the capillary absorption of water by Portland cement-based materials is anomalously low when compared to the absorption of other liquids. This slag powder requires more storage space and also has 39 less value in the market than the slag used as aggregate for road construction . A disadvantage of LD slag is its greater weight compared to natural rock, and this has an impact on logistics and transport costs. We additionally conducted to utilize these materials of by-products in concrete making for the construction work to renew the Takehara Thermal Power Station Unit 1 in Hiroshima Prefecture. Steelmaking slag Because of its hydraulic property and the large bearing capacity it can provide, steelmaking slag is used as a road base course material. Stainless steel is used in the kitchen accessories, cutlery and cookware. The most common use is as an aggregate in the manufacture of asphalt. They are a valuable mineral resource for the construction but have chemical properties that directly control their stability or any hydraulic activity. Fundamentals of stainless converting will be shortly discussed too. As the slag … The tests results obtained from concretes produced in stages 1 and 2 were compared with those of conventional concrete (CC) and the adequate use of the by-products for concrete production was verified. Concrete made with EAF slag as aggregate showed good strength characteristics since, in normal environmental conditions, strength properties of the conglomerate containing EAF slag are totally comparable (or even better) than those observed for traditional concrete. As a global leading steel and technology group, the voestalpine AG Corporate Blog covers topics relating to innovation, mobility, energy, engagement, careers and events. stabilizing furnace slag is related to the property of the slag itself. Slag is completely stabilized when the expansion capacity of the slag mortar bar does not exceed 0.052% after three hours of autoclave at 215.7 Â°C. 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. 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. This is the result of its mineral composition. Fuzzy modeling and control in BOF promise a solution to the strongly non-linear problems associated with the process, which have so far proven extremely difficult to be solved by conventional control methods. This study aims to relate the mixture parameters (nature of aggregate and volume of the fine grain) with the thermal characteristics of lightweight aggregate concrete in order to optimize the couple resistance / insulation. The examination of several long-term expansion results for concretes subjected to accelerated alkaliâaggregate reaction (AAR) tests shows that, in some cases, the expansion continues for a long time after AAR has stopped. Due to adequate properties of all concretes found in stage 2, length change (during 56weeks), sorptivity and high temperature exposure evaluation were also determined. The results indicated that the durability characteristics of steel slag cement concretes were better than those of crushed limestone aggregate concrete. Heavy work is carried out down to 1050°Cand a light ﬁnish is applied to the bottom of the range. Two concrete production stages were carried out. Steel slags are generally rich in Ca and Mg which make them suitable for mineral carbonation. There are over 150 different grades of stainless steel, which are used in making bridges, kitchen utensils, automotive bodies, aircraft, etc. To minimize the oxidation of chromium, the oxidation potential must be controlled and decreased along the lowering carbon content. The use of a combination of these by-products concrete, significant carbon dioxide emissions reduction effect can be expected. Through mineral carbonation the slags can be transformed into marketable construction materials, without the use of cement or other binders. In contrast, natural rock becomes smooth with wear—its surface becomes polished and slippery. With high particle density and hardness, this slag has superior wear resistance and for this reason is used as an aggregate for asphalt concrete. Slag is the glass-like by-product left over after a desired metal has been separated from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. There are two main types of slag: blast furnace and metallurgical slags. Steel slag is a mineral byproduct generated during steel production. However, Ni seldom exists in the silicate phases. In stages 1 and 2, slump test and compressive and tensile splitting strengths and modulus of elasticity were determined. When he’s not in front of the camera, he’s responsible for sales at voestalpine BÖHLER Aerospace as Vice President Sales. the chromium distributions between slag and alloys, requires a knowledge of the activity-composition relations of chromium oxides as well as the phase relations in the slag. Nevertheless, the distribution of lime between nodules and micro-inclusions may play a major role and could explain that similar amounts of lime can induce different instabilities. Lightweight aggregates allow making concretes having mechanical properties answering to structural criteria and thermal insulation, improved with regard to the normal concrete. A good slag practice is essential for production of a high-quality stainless steel. LD slag is harder and internally bound. This approach is more effective for these materials: the volume expansion of pastes cured in water is avoided and the compressive strengths are thus significantly improved. The main objective of this paper is to evaluate the behavior of concretes with EAF slags with structural responsibility exposed to gamma radiation. Slag is used all over the world in road and railway construction and for engineering, and has many advantages over natural rock. Also, thanks to its luster, it even finds use in ornaments and sculptures too. The use of waste glass incorporated into construction materials has been the focus of several studies. Based on the resulting high strengths, fine grinding of manganese-rich slag for use in concrete appears to be a good way of beneficiation. Slags are one of the most natural products of all. 40 At present, both slags are generally treated as waste and dumped in landfills. Particle size analysis demonstrated that the EAF and AOD had been finely ground at the plant with 56 and 65% (â75 Î¼m), respectively, containing a large amount of slime. Capillarity, drying-wetting and freezing-thawing resistance of the concrete can be accepted to some extent. The mechanical properties of concretes with EAF are similar or higher than the measured for conventional concretes and, in all cases, are significantly higher than the obtained for concretes with barite. Alternative 41 uses for these stainless steel slags could be applied. Mass change of all specimens was measured after removing detached particles gently. However, slags can contain metal sulfides and elemental metals. According to their chemical composition they are a valuable mineral resource as additions in certain hydraulic binders. The corrosion of the metals occurs mainly due to their reaction with the pore fluid but the effect of the cement itself as a source of additional ions must not be underestimated. in the 1950s, first by applying oxygen top-blowing through lance and little later as oxygen bottom-blowing through nozzles. Download as PDF. The efﬁciency of the slag also appears to be more dependent on its iron content than on its concentration or particle size. 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. As LD slag is harder and more compact than natural rock, roads last longer. sand in both groups. Further facts and figures on LD slag: http://bit.ly/ld-slag. For the slags and cokes studied, the minimum channel diameter that allowed slag to flow was between 4.4 and 5.0 mm. Stainless steel finds use in all the places where the presence of moisture or water prevents carbon steel from being used. Less ductile grades of steel are used to make knife blades with sharp edges. The stainless steel slag contains chromium and iron as well as significant levels of heavy metals, such as Cr(VI). Optical microscopy, scanning electron microscopy and electron probe microanalyses revealed that LD steel slags mainly contain calcium silicates, dicalcium ferrites, iron oxides and lime. The 5% replacement rate showed the best results. The normal concrete, drying-wetting and freezing-thawing resistance of the concrete BOF ) slags are one the! Steelmaking process must be crushed and stabilized concrete strength and properties with height! The oxidation of chromium, the slag uses of stainless steel slag swelling due to the alkaline environment the! Leaching of minor elements from the tailings of a simple gravity and capillary/interfacial force analysis the! 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