slag cement uses

The artificial reefs show a high stability in seawater due to the fact that it consists of CaCO3, like shells and coral, and they act as great breeding habitats for seaweeds and coral. However, the former has certain advantages: it has lower heat evolution and is more durable. Ground granulated slag is often used in concrete in combination with Portland cement as part of a blended cement. Steelmaking slag is mainly calcium alumino silicate. 7 High Sensitiveness to Moist Heat at Hardening . The combined use of steelmaking slag and hydrogen peroxide (H2O2) can decompose organic pollutions due to the ferrous ion produced from FeO in steelmaking slag reacting with H2O2 to form Fenton’s reagent which has strong oxidation. Conference themes. Tab 1 summarizes the chemical composition of BOF slag and EAF slag. Slag cement is a recovered byproduct of the iron manufacturing process and can be used to replace a portion of portland cement in concrete mix design. Steelmaking slag can also be used to produce coloured paving bricks and tiles. Natural raw materials used to manufacture cement include limestone, shells, and chalk or marble combined with shale, soil, slate, blast furnace slag, silica sand and iron ore, in different proportion and percentage combination as per their individual properties. As steelmaking slag is formed, it is in a molten or red-hot state at temperatures ranging from 1,300 deg C to 1,700 deg C. This slag is immediately subjected to the cooling process upon removal. Blast Furnace Slag Cement: Definition: Properties: Uses: 8. Every type of cement has their own properties, advantages, and disadvantages. They are comparable to fluid magma from the earth’s core. Easier to place; Lighter in color; Improves workability Hence, after cooling, the slag is crushed and the scrap is recovered by magnetic separation. In recent years, steam aging treatment or high pressure aging treatment is often applied to steelmaking slag to ensure moderate, uniform expansion of the slag, especially when the slag is to be used, for example, for road base course material, where expansion can become a major problem. Slag is primarily used in the cement and construction industries, and largely in road construction. (adsbygoogle = window.adsbygoogle || []).push({}); The processing of the steelmaking slag (Fig 1) is normally carried out by (i) solidifying and cooling of the hot liquid slag, (ii) crushing and magnetic separation treatment of the slag to recover the scrap, (iii) crushing and classification of the slag for grain size adjustment to manufacture the slag product, and (iv) aging treatment of the slag product for improving its quality and volumetric stability. Using our slag cement CEMSlag TM in concrete provides a more environmentally friendly and sustainable option because it requires less energy to be produced, resulting in less greenhouse gas emissions. After slag is allowed to age, it can be sold for use in other industrial processes. During the steelmaking processes the added flux for the refining of the steel forms a component of the steelmaking slag. Hence, carbon capture and storage (CCS) research has been the focus of CO2 reduce technology. These inactive materials, referred to as free CaO and free MgO, react with water, and, in the process, their volume nearly doubles through hydration. Steelmaking slag and air-cooled BF slag have appearance and characteristics similar to those of crushed rock or sand, and taking advantage of these proper-ties, they are used for civil construction applications such as road base course, materials for civil engineering works, and the aggregate for concrete. /* 300x250, created 1/18/11 */ Scrap steel reclamation – Steelmaking slag contains around 10 % scrap steel, which can be reclaimed through crushing, sorting, magnetic separation and screening process. Various slag cement ratios (100:0, 85:15, 70:30 and 55:45) as well as different water binder ratios (0.42, 0.46 and 0.50) have been used to get the idea for optimum mix ratio. \ As slag is a coarse glass, it maintains high permeability (0.045 centimetres per second) regardless of how much water has passed through it. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Characteristics of steel slags and their use in cement and concrete—A review. However, this technology is still in the laboratory research stage. In this paper, an overview of the recent achievements and challenges of using steel slags (BOF, EAF and LF slag) as cement replacement (usually ground into powder form with the size of 400–500 m2/kg) and aggregate in cement concrete is presented. Steel slag is an industrial byproduct obtained from the steel manufacturing industry. The use of slag in the process of sintering improves the quality, reduce fuel consumption due to the heat liberation of Fe and FeO oxidation reaction, and decrease the cost of sinter. or ?ladle slag? Some typical mechanical properties of steelmaking slag are as follows. The PSC is also called Blast Furnace Slag Cement because of its make. It primarily consists of silicates, alumina silicates, calcium aluminum silicates, iron oxides and crystalline compounds. How GGBS cement is used. The 1st Virtual Global Slag Seminar took place on 6 May 2020. Advantages. 15th Global Slag Conference, Exhibition & Awards 16 - 17 June 2021, Vienna 'Maximising profits from slag' #globalslag. In terms of their physical and chemical properties, slags … Enter your e-mail address and your password. The steelmaking slag is composed mainly of calcium oxide (CaO) and silica (SiO2). In addition, steelmaking slag as a separated adsorbent can be used to remove aqueous ammonium nitrogen, phosphorous, and phenol. White Cement: 11. Further, steelmaking slag used as a coarse aggregate improves the mechanical properties of asphalt mixtures. Through the ispatguru.com website I share my knowledge and experience gained through my association with the steel industry for over 54 years. The removal mechanism includes the co-precipitation and adsorption of CaCO3. 3.3 Japan. google_ad_height = 250; Steelmaking slag is an integral part of the steelmaking process. Portland slag cement can be used for all purposes for which ordinary Portland cement is used. Workability. Hence, a number of more efficient cooling processes have been developed. Slag works very well as a loose aggregate and can be ground to produce a more even grain. However, better utilization for value-added purposes in cement and concrete products can be achieved. Higher 28-day strength. Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. The separated slag produced is further processed by the process of crushing and classification. Tab 3 lists the relationship between the characteristics and application areas of steelmaking slag. Hence, the application of steelmaking slag in industrial waste water treatment has received intensive attention in recent years. Further in order to increase the scrap recovery ratio and to improve the quality of scrap recovered, the crushing and magnetic separation process is repeated several times. Water Proof Cement. which uses high-temperature steam, ?hot water aging treatment? The treatment of mercury containing sea water with steelmaking slag shows the high adsorption capacity of steelmaking slag for mercury. Ground slag cement by end use and Portland Clicker replacement was projected more than 40% of overall global ferrous slag production volume in … The first recorded production in the US of blended cement containing both slag and portland cement was in 1896 對\⠀䄀䌀䤀 ㈀ ㄀㄀尩. Considering the environmental and economic aspects, steel slags are also considered to have a potential use as the raw meal in cement clinker production. However, this method requires a considerable amount of time to cool the hot slag down to a workable temperature and requires a spacious yard. A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. google_ad_width = 300; Used for structures meant for water retaining such as retaining wall, rivers, ports, tunnels for improvement in impermeability. Several studies have been made for the technological condition of CO2 sequestration with steelmaking slag slurry, including reaction time, liquid-to-solid ratio (L/S), temperature, CO2 pressure, and initial pH. The first is the normal aging treatment, in which the hydration reaction is allowed to take place by nature in the yard, while the second process consists of accelerated aging treatment in which the hydration reaction is induced to complete in a shorter period of time. The permeability of the slag is reduced when it is compacted or grounded into smaller particles. These include the air granulation process, in which a high pressure gas is blown onto the liquid slag to solidify and granulate the slag while it is being cooled, the ?instantaneous slag chill? They have moderate water absorption (less than 3 %). In addition, it is easy to separate from water due to its high density. In some of the countries, steelmaking slag is used to produce siliceous fertilizer, phosphorus fertilizer and micronutrient fertilizer. Uses in for materials of waste water treatment – Steelmaking slag presents porous structure and large surface area. Typical particle size distribution and variation in Fe and P content of the slag fractions is given in Tab 2. It is produced during the separation of the liquid steel from impurities in steelmaking furnace and is a non-metallic by-product of steelmaking process. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. By continuing you agree to the use of cookies. Moreover, volume resistivity values of steelmaking slag shows that the electrical conductivity of the steelmaking slag asphalt mixtures are better than that of limestone asphalt mixtures. BOF, EAF, steel teeming ladle, or tundish). Many of the residuals are encased within a glassy matrix. 2003). The slag generated in the basic oxygen furnace (BOF) and electric arc furnace (EAF) is of basic nature while the slag is of acidic nature in induction furnace because of the use of silica ramming mass as the lining material. Similarly, the volumetric stability of the slag is a function of its chemistry and mineralogy. Usage in sinter mix -Steelmaking slag contains high percentage of CaO (mostly above 50 %). Its earliest use was documented in 1774, when it was combined with slaked lime and used as a mortar . Due to the high heat capacity, steelmaking slag aggregates have been observed to retain heat considerably longer than conventional natural aggregates. Super Sulfate Cement: 13. This is one reason why slag cement can be used in much larger amounts. Steel slag can also be produced by smelting iron ore in a basic oxygen furnace. Air Entraining Cement. Slag cement is used in concrete for virtually any construction application, either in conjunction with traditional portland cement, part of blended cement or as a separate component. Steelmaking slag can be used as a low-cost adsorbent for arsenic in aqueous system, showing around 95 % to 100 % removal efficiency near initial pH value of 2. used as the raw material for BF slag cement. In this process, around 50 % of decarbonization slag is retained in the converter after the decarbonization process and hot recycled as dephosphorization and desiliconization slag for the next heat, resulting in increased dephosphorization efficiency and decreased CaO consumption. In addition, it contains iron oxides (FeO, Fe2O3), manganese oxide (MnO), magnesium oxide (MgO), alumina (Al2O3), and phosphorus penta oxide (P2O5) etc. In appearance, steelmaking slag looks like a loose collection, and appears hard and wear-resistant due do its high Fe (iron) content. To check for suppliers in your area, use the SCA’s slag cement locator. Among current popular CO2 sequestration routes, the mineral CO2 sequestration is regarded as a potential important technology due to its benefits such as environmentally caring, permanent trapping CO2 in form of carbonate, and without the need of post-storage surveillance for CO2 leakage. These processes are explained below. Usage in hot metal dephosphorization – Nippon Steel Corporation (NSC) has developed the MURC (Multi-Refining Converter) process, in which dephosphorization and decarbonization are conducted in the same converter. Any waste can be considered as secondary material resources, which may be fully or partially (as additives) used in production (Klassen et al. Slag cement replaces as much as 50 percent in normal concrete (and up to 80 percent in special applications such as mass concrete). Depending on the rate of free CaO and/or free MgO this reaction causes a volume increase of the slag mostly combined with a disintegration of the slag pieces and a loss of strength. Replacement levels for GGBS vary … (ISC) process in which the hot slag is first poured into a steel box for accelerated cooling/solidification and then subjected to water sprinkling and immersion cooling, and the rapid cooling process in which the liquid slag is poured into a special drum and cooled rapidly by sprinkling water over the slag. The main mineral phases contained in steelmaking slag are dicalcium silicate (C2S), tricalcium silicate (C3S), RO phase (CaO-FeO-MnO-MgO solid solution), tetra-calcium alumino-ferrite (C4AF), olivine [(Mg, Fe)2SiO4], merwinite [Ca3Mg(SiO4)2], and free CaO. google_ad_client = "ca-pub-7057920448327527"; Used in mass concreting works such as dams, foundations which require low heat of hydration. As a measure to prevent this, the steelmaking slag is subjected to the aging treatment process, whereby the following hydration reaction is completed by the time the slag is put to use. GGBS cement can be added to concrete in the concrete manufacturer's batching plant, along with Portland cement, aggregates and water. Colored Cement: 10. Companies that use slag cement in the USA emphasize the CO 2 saving effect compared to conventional OPC (Ordinary Portland Cement). Slag cement has actually been used in concrete projects in the United States for over a century. Fig 2 Schematic flowsheet for slag processing. Knowledge of the chemical, mineralogical, and morphological properties of steelmaking slag is necessary since their cementitious and mechanical properties play a vital role in its utilization. Usage in the production of cement and concrete – The presence of C3S, C2S and C4AF endorse steelmaking slag cementitious properties. When a mixture of fly ash, powder of steelmaking slag and cement clinker is used to prepare composite cement then it can be noticed that a certain amount of steelmaking slag admixture in cement can reduce the porosity, improve pore distribution and increase the consistency of cement. It is a recovered industrial by-product of an iron blast furnace. Its bulk density is in the range of 1.6 tons per cubic metres (t/cc) to1.9 t/cc. The grindability index of steelmaking slag is 0.7, in contrast with the value of 0.96 and 1.0 for blast furnace slag and standard sand respectively. Uses of Blast-Furnace Slag Cement In ready mix concrete plants. One of the most common is as a constituent of concrete and cement. For constructions meant for water retaining such as rivers, retaining wall, harbors, tunnels for improvement in impenetrability. The use of slag as partial replacement of cement in slag cement mortar exposed to artificial sea water environment has been studied particularly form the development of the compressive strength point of view. When a mixture of fly ash, powder of steelmaking slag and cement clinker is used to prepare composite cement then it can be noticed that a certain amount of steelmaking slag admixture in cement can reduce the porosity, improve pore distribution and increase the consistency of cement. In some countries experience has found that steelmaking slags with a free CaO content upto 7 % may be used in unbound layers and upto 4 % in asphaltic layers. Further, steelmaking slag concrete shows similar fire resistance to the river aggregate mixture up to 400 deg C, and much improved fire resistance at high-temperature ranges. The use of iron and steel slag has a long tradition in Japan [4]. Hence, the volume stability is a key criterion for using steelmaking slags as a construction material. They can be categorized into basic oxygen furnace (BOF) slag, electric arc furnace (EAF) slag, and ladle furnace (LF) slag. google_ad_slot = "4743063532"; Expansive Cement. Steel slags are industrial by-products of steel manufacturing, characterized as highly calcareous, siliceous and ferrous. The advantage of slag is its ability to substitute more of cement. Portland slag cement is used in all types of residential construction, commercial construction and industrial construction. It will take less then a minute, Bulk Material Storage and Storage Yard Machines, Technological and other processes/equipments associated with steel industry, Management in steel plant along with training and development, Raw materials and other materials used in steel plants, Marketing Concepts and Comparison with Selling Concepts, Role of Safety and its Importance in a Steel Organization, Role of Leadership in the Management of Organizations, Hard, wear resistant, adhesive, and rough, Aggregates for hydraulic construction and road, Cementitious components (C2S, C3S, and Ca4AF), Fertilizer components (CaO, SiO2, MgO, FeO), Los Angeles abrasion (ASTM C131) – 20 % to 25 %, Sodium sulphate soundness loss (ASTM C88) – Less than 12 %, Angle of internal friction – 40 degrees to 50 degrees, Hardness – 6 to 7 Moh’s scale of mineral hardness, California Bearing ratio (CBR) – Upto 300 for maximum size of 19 mm. For example, the frictional property of steelmaking slag is influenced by its morphology and mineralogy. Since most of the steel produced in the world is by BOF and EAF processes, hence slag from these processes is discussed in this article. Steelmaking slag has several applications. In this process (Fig 2) crushers, magnetic separators, and screens are used for simultaneous recovery of scrap and adjustment of slag grain size. They used three different blast furnace slags, named S1 (basic slag), S2 (neutral slag) and S3 (acid slag), and comparison was made with an ordinary Portland cement. Fly ash is usually limited to 20 or 30 percent. In case of the removal of copper using steelmaking slag, the major mechanisms are adsorption and precipitation. Usually, this is performed in a cooling yard by air cooling and moderate water sprinkling. Slags are one of the most natural products of all. Ground granulated slag reacts with a calcium byproduct created during the reaction of Portland cement to produce cementitious properties. Steelmaking slag can also be used as an aggregate for high-strength and refractory concrete. Slag cement should not be used in the concrete projects of which the impermeability is very important. Uses of Blast-Furnace Slag Cement Used in ready mix concrete plants. https://doi.org/10.1016/j.resconrec.2018.04.023. Steelmaking slag can be used for desulphurization due to its high CaO, especially free CaO content. It is a potential material for ceramic production. Its alkaline property neutralizes soil acidity. CO2 is one of the primary green-house gases, which gives great contribution to the climate change. The heat retention characteristics of steelmaking slag aggregates can be advantageous in hot mix asphalt repair work. The density of steelmaking slag lies between 3.2 grams per cubic centimeters (g/cc) to 3.6 g/cc. In mineral carbonation, CO2 gas is stored by promoting magnesium or calcium oxides in silicate minerals to react with carbon dioxide and form carbonates. The chemical composition of steelmaking slag varies with the furnace type, steel grades and pretreatment method. They are found to be useful in many fields, such as road construction, asphalt concrete, agricultural fertilizer, and soil improvement. It is advantageous to separate this scrap from the slag for the purpose of recycling the recovered scrap in the primary steelmaking process for making the slag free from scrap for its various applications. Molten slag diverted from the iron blast furnace is rapidly chilled, producing glassy granules that yield desired reactive cementitious characteristics when ground into … Uses: 7. However, the produced quantity of blast furnace slag decreased from 25.4 Mta in 2007 to 23.0 Mta in 2017, but the proportion of granulated slag rose slightly from 82.6 % to 84.4 %. Usage in road and hydraulic construction – Steelmaking slag can be processed to aggregates of high quality comparable with those of natural aggregates because of its high strength and durability. The use of slags in raw mixes increased the mechanical strength of cements by over 50%. ), and slag formed in tundish during continuous casting of steel (also known as tundish slag). Steelmaking slag can also be used as raw material for coagulant preparation. For the incorporation of steel slags as aggregate in concrete, special attention needs to be paid due to the potential volumetric instability associated with the hydration of free CaO and/or MgO in the slags. A study on wet flue gas desulphurization with steelmaking slag powder has shown that by a reasonable design and suitable operation, the steelmaking slag used in wet desulfurization rate can reach more than 60 %. It occurs as a molten liquid melt and is a complex solution of silicates and oxides which solidifies upon cooling. The fineness of slag is also an important factor influencing the activity, and the potential cementitious property of slag fines significantly increases with their fineness. Hydrophobic Cement: 12. 1 Introduction. The artificial reefs for seaweed/coral breeding have been made using carbonated steelmaking slag. Also, a suitable addition of steelmaking slag can reduce the firing temperature needed for clay bricks. © 2018 Elsevier B.V. All rights reserved. We use cookies to help provide and enhance our service and tailor content and ads. The high bulk density, the high level of strength and abrasion as well as the rough texture of steelmaking slag makes it a suitable as a construction material for hydraulic engineering purposes. It gives a smooth finish because the cement particles are more fineness. , ports, tunnels for improvement in impenetrability the raw material for slag... On 10 November 2020 a long tradition in Japan [ 4 ] cooling processes have been made using carbonated slag! ( desulphurization, desiliconization, and MgO in steelmaking furnace and is in. Be ground to produce coloured paving bricks and tiles 6 May 2020 recent years and! Allows for easier placement and finishing and C4AF endorse steelmaking slag shows the adsorption... For over 54 years crushed and the scrap is recovered by magnetic separation Awards. To produce a more even grain provide and enhance our service and tailor content and.... Retaining walls, foundation, and mercury mainly of calcium oxide ( CaO ) and silica ( SiO2 ) century! Porous structure and large surface area and oxides which solidifies upon cooling research has been the of... \⠀䄀䌀䤀 ㈀ ㄀㄀尩 this compound contains elements like sulphur, selenium, carbon, cadmium, lead,,. Or as fertilizer mass concrete structures such as retaining wall, harbors, tunnels improvement... Longer than conventional natural aggregates 15th Global slag Seminar took place on 10 November.! A direct replacement for a portion of the slag cement Clinker phases Microstructure conference..., dense surface and slightly finer particle size distribution and variation in and. Adsorption capacity of steelmaking slag is a byproduct of steel production and more. Steelmaking, slag is immersed in hot mix asphalt repair work for easier placement and.... Uses high-temperature steam,? hot water, free CaO and MgO steelmaking... And physical characteristics longer than conventional natural aggregates with Portland cement nitrogen phosphorous. Combined with slaked lime and limestone hence, steelmaking slag & developed by: Star Web Maker,... Percentage of CaO ( mostly above 50 % ) knowledge and experience gained my... Uses high-temperature steam,? hot water aging treatment through the ispatguru.com I., phosphorus fertilizer and micronutrient fertilizer react to hydroxides mostly above 50 % ) is produced in large quantities steel-making! Calcium byproduct created during the steelmaking processes the added flux for the refining process or from some of the slag... Improved … the PSC is also called blast furnace slag cement locator, cooling... Slag, the slag is allowed to age, it can be used as raw. More efficient cooling processes have been developed be sold for use in other industrial processes, and.! Volume stability is a recovered industrial by-product of steelmaking slag is a of. Iron ore sintering process where it replaces lime and limestone silica ( SiO2.... Non-Metallic by-product of steelmaking slag high heat capacity, steelmaking slag is clearly for... Of cookies in industrial waste water treatment – steelmaking slag has a long tradition in [! For use in other construction materials – steelmaking slag is allowed to,... Replacement levels for ggbs vary … uses of Blast-Furnace slag \⠀䜀䜀䈀䘀匀尩, has been the focus co2! Function of its make of 1.6 tons per cubic metres ( t/cc ) to1.9.. Cement locator treatment – steelmaking slag has favourable mechanical properties for aggregate use, including good resistance. Previously known as ground-granulated Blast-Furnace slag cement Clinker phases Microstructure Download conference paper PDF 18 cheaper! On 10 November 2020 formed in tundish during continuous casting of steel production is. Good soundness characteristics, and phenol steel slags are industrial by-products of steel production and a..., harbors, tunnels for improvement in impenetrability [ 4 ] this is! Be added to concrete in combination with Portland cement in ready mix concrete plants heat retention characteristics of steelmaking used! % in cost has certain advantages: it has lower heat evolution and is more resistant to the high capacity! Density of steelmaking slag lies between 3.2 grams per cubic centimeters ( g/cc ) to g/cc. A direct replacement for Portland cement large surface area of CaCO3 a paste. The most common is as a replacement for Portland cement, previously known as slag... Easy to separate from water due to the attack of weathering agencies part of the most common is as constituent. Production in the US of blended cement number of more efficient cooling processes have been using. Use was documented in 1774, when it is produced during the separation the. A slag cement uses matrix the first recorded production in the hot metal pretreatment processes (,... Slaked lime and used as cement additives and concrete slag cement uses tab 1 summarizes the chemical composition steelmaking. An industrial byproduct obtained from the steel manufacturing, characterized as highly calcareous, and! Value-Added purposes in cement and construction industries, and mercury properties: uses:.... Contains around 10 % of scrap which comes from the earth ’ core! 1.6 tons per cubic centimeters ( g/cc ) to 3.6 g/cc with water, and dephosphorization etc of (... Concrete, agricultural fertilizer, and disadvantages longer than conventional natural aggregates centimeters g/cc. In some of the slag is closely related to its high density causes the slag to react with steam a. Around 1.1 to 1.3 times of common concrete a fluid paste that allows for easier placement and finishing to,. The cementitious ability of all steel slags are one of the most natural products of all steel are... A century © 2019, Design & developed by: Star Web Maker the liquid steel from impurities in furnace... And disadvantages ) to1.9 t/cc used for all purposes for which ordinary Portland cement part... Through my association with the furnace type, steel teeming ladle, or ). As dams, foundations which require low heat of hydration cement particles are more fineness performed. Of aggregates and cement component in the range of 1.6 tons per cubic metres ( t/cc ) to1.9 t/cc classification. Retention characteristics of steelmaking slag for mercury industry for over a century furnace slag cement Clinker Microstructure! Large quantities during steel-making operations that use slag cement, previously known as ground-granulated Blast-Furnace slag cement in ready concrete!, steelmaking slag can also be produced by smelting iron ore in a basic oxygen.... Pressure ( 6 kg/sq cm ) mass concreting works such as road.. Have rough surface texture mitigate the instability more fineness component of the primary green-house,. Co2 reduce technology building sector or as fertilizer sold for use in other construction materials – slag. -Mgo to mitigate the instability into fine powder can be added to concrete in combination with Portland cement to a... Tab 2 it can be ground to produce siliceous fertilizer, and.! Fluid magma from the earth ’ s core residuals are encased within a matrix... Easier to place ; Lighter in color ; Improves workability the use of.. First recorded production in the mix remain unchanged slag varies with the furnace type, steel teeming ladle or... Electric arc furnaces production of cement has their own properties, advantages, and etc! Storage ( CCS ) research has been the focus of co2 reduce technology through ispatguru.com. In preparing glass ceramics is reduced when it was combined with slaked lime and used as a for... Generally accepted that the cementitious properties some typical mechanical properties of slag cement uses mixtures profits from slag #. Fe and P content of the steelmaking slag as a direct replacement for Portland cement to coloured. A replacement for a portion of the countries, steelmaking slag used as a concrete aggregate during... And treatments can enhance the hydrolyses of free-CaO and -MgO to mitigate the instability its earliest use was in. Website I share my knowledge and experience gained through my association with the steel industry for over a century mostly..., siliceous and ferrous cementitious properties of steelmaking slag as fine aggregates is around 1.1 to 1.3 times common... My knowledge and experience gained through my association with the steel forms a component of the fractions... Added to concrete in combination with Portland cement after slag is composed mainly calcium... Resistance, good soundness characteristics, and as a constituent of concrete and cement to times. Related to its high CaO, SiO2, and dams bof, EAF, steel grades pretreatment... 10 November 2020 application areas of steelmaking slag can also be used as fluxing agent in the mix unchanged! Mass concreting works such as dams, foundations which require low heat of hydration in... Or from some of the residuals are encased within a glassy matrix between 3.2 grams per cubic centimeters ( ). Compressive strength of cements by over 50 % the CO 2 saving effect compared to conventional (! To age, it can be used as cement additives and concrete admixtures encased within a glassy matrix with., has been the focus of co2 reduce technology, on a one-to-one basis weight... Production of cement ye\ൡrs \⠀䄀䌀䤀 ㈀ ㄀㄀尩 criterion for using steelmaking slag a! Of waste water treatment – steelmaking slag can also be used for all purposes for which ordinary cement... Granulated slag is used in the mix remain unchanged which uses high-temperature steam,? hot water treatment... Can also be used in all types of residential construction, commercial construction and industrial.... Separated slag produced is further processed by the process of crushing and classification with a calcium byproduct created during reaction. Size distribution and variation in Fe and P content of the removal of copper using steelmaking is. A concrete aggregate in tundish during continuous casting of steel production and is a non-metallic by-product steelmaking! 1774, when it is easy to separate from water due to its high CaO SiO2. They have moderate water sprinkling nitrogen, phosphorous, and slag cement uses will typically 18.

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