Blog. Using slag cement to replace a portion of portland cement in a concrete mixture is a useful method to make concrete better You will be subscribed to our mailing list. Slag is primarily used in the cement and construction industries, and largely in … Furnace concrete reduces the risk of reinforcement corrosion improved slag cement, such improved slag cement, such improved slag cement, such because of high resistance to chloride ingress, It gives high resistance to the attack by sulphates and other chemicals. It appears in concrete, aggregate road materials, as ballast, and is sometimes used as a component of phosphate fertilizer. It is a recovered industrial by-product of an iron blast furnace. Granulated blast furnace slag has product codes commencing with 'GBF'. The use of slag in concrete has several benefits, including reduced energy, reduced greenhouse gas emissions, and reduced use of raw materials. In concrete, slag cement may be proportioned from 20 to 80 percent depending on the application. This aids in applications such as finishing floors. Slag Cement Benefits and Use in Concrete. Slag cement is a byproduct of the iron-making process and is composed primarily of silica and calcium. Slag cement, or ground granulated blast-furnace slag (GGBFS), has been used in concrete projects in the United States for over a century. Yes, some applications do not support the usage of SCMs such as when producing pervious or permeable concrete. Slag Concrete AAS concrete is very environment friendly, superior quality concrete type that uses blast furnace slag activated in an alkaline solution as a binder material. This product is marketed to the cement industry by ASMS as a cementitious material. Fly ash is more of a smooth particle rather than slag’s rough and jiggered texture. Slag cement, often called ground granulated blast-furnace slag (GGBFS), is one of the most consistent cementitious materials used in concrete. Blast furnace slag cement is the mixture of ordinary Portland cement and fine granulated blast furnace slag obtained as a by product in the manufacture of steel with percent under 70% to that of cement. leading to utilization of large quantity of concrete. Slag cement (Ground Granulated Blast Furnace Slag) and fly ash ( Coal Combustion Product) are the most commonly used supplementary cementitious materials in construction today. Concrete plays a vital role in the development of infrastructure Viz., buildings, industrial structures, bridges and highways etc. Commonly known as 'GGBS'Regen is Ground Granulated Blast furnace Slag, commonly known as ‘GGBS’.It is a cement substitute, manufactured from a by-product of the iron-making industry.Using one tonne of Regen in concrete reduces the embodied CO2 by around 850kg, compared to using one tonne of Portland Cement. And lastly, when you just want to cut down the material costs of concrete. The advantage of slag is its ability to substitute more of cement. But this leads to lower heat of hydration and thus lower temperature rise in the concrete. Slag is similar to fly ash in that it is finer than standard Portland cement and is also cheaper as it is a process byproduct. Slag Cement in Concrete - Standard Specifications Slag cement as a constituent of blended cement ASTM C595 or AASHTO M 240 Standard Specification for Blended Hydraulic Cements Type IS(35) = 65% PC + 35% Slag Type IT(S25)(P15) = 60% PC + 25% Slag + 15% Pozzolan Type IT(S25)(L10) = 65% PC + 25% Slag + 10% Limestone leading to utilization of large quantity of concrete. Quite simply, fly ash is the remnants of burning coal. This is a distinctive characteristic of concrete with slag cement and is a … Currently there are many types of concrete that are developed and used in construction that include metallurgical slags both as a binding component and as fillers. ACI 116R-00, Cement and Concrete Terminology, American Concrete Institute, Farmington Hills, Michigan, 2000. 3.5.7 Concluding remarks. 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. Concrete made with recycled steel slag is 17 percent stronger than traditional concrete. Constructed on the west campus of the former St. Elizabeth’s hospital site in Washington, D.C., the US Coast Guard Headquarters project includes an 11-story office building for 3,860 workers, a nine story 800,000 square foot parking garage, a central utility plant, and a National Operations Center. Blast Furnace Slag can be processed into another form by Granulation. It is commonly a waste product and may be used as the aggregate component of some concrete. temperature and mixture components, among other things. These granules are dried and then ground to a suitable fineness, the result of which is slag cement. Fly ash can only be activated when cement is being used as well. The PSC is also called Blast Furnace Slag Cement because of its make. PSC has the lower evolution of heat. It also needs longer period to gain required strength. While the previous three answers are close, they don’t get the brass ring. Based on these early experiences, modern designers have found that these improved durability characteristics help further … expressed or implied, including any warranty of fitness for a particular This video introduces fly ash, slag and silica fume and discusses their properties. It is not uncommon for contractors to overlook the use of fly ash and slag in their concrete. It improves durability & resilience. Common applications include filling small cracks where one may need a low graded mix to get in the tight spaces. The molten iron sinks to the bottom, while the slag will float on the top of the iron. What is Slag Cement. Slag is a byproduct of metal smelting, and hundreds of tons of it are produced every year all over the world in the process of refining metals and making alloys.Like other industrial byproducts, slag actually has many uses, and rarely goes to waste. 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. Slag cement or GGBFS is granulated blast-furnace slag that has been finely ground and that is hydraulic cement. Slag is primarily used in the cement and … purpose.”. Based on these early experiences, modern designers have found that these improved durability characteristics help further reduce life-cycle costs and lower maintenance costs. This is usually the case when the contractor doesn’t truly understand the role that Supplementary Cementitious Materials (SCMs) have in concrete. You can unsubscribe with the link provided within each mail-out. Slag When added to concrete, GGBFS enhances a range of performance characteristics such as the reduction of the heat of hydration in mass concrete pours, reduction of concrete permeability and improvement of durability properties in resistance to aggressive environments. It typically replaces part of the portland cement in concrete mixes. It is a recovered industrial by-product of an iron blast furnace. Resources. The ground granulated blast furnace slag (GGBFS) is a by-product of iron manufacturing which when added to concrete improves its properties such as workability, strength and durability. Blast-furnaces operate at temperatures of about 1,500°C and are fed with a carefully controlled mixture of iron ore, coke and limestone. It appears in concrete, aggregate road materials, as ballast, and is sometimes used as a component of phosphate fertilizer. Common materials used to manufacture cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore. Color of concrete incorporating slag. Concrete proportioning is the selection of proportions of ingredients to make the most economical use of available materials to produce concrete of the required properties.. Why use Slag Cement in Concrete? Molten slag floats on top of the molten iron; both are tapped separately. Ground Granulated Blast furnace Slag (GGBS) is a by product from the blast furnaces used to make iron. Slag is produced during the iron-manufacturing process. …of lightweight concrete, using blast-furnace slag in place of stone as aggregate for floor construction; this reduced the density of the concrete by 25 percent, with a corresponding reduction in the loads the building columns needed to carry. However, even when SCMs are a valid option, contractors do not take the time to include it in their mix design. www.tylerley.com and iron—collect in the bottom of the hearth. Learn more about how to set up your volumetric mixer with a fly ash bin by contacting the Bay-Lynx team at 905-304-3900. 5 Tips for Pouring Concrete in the Summer Heat. See the diagram below: Another difference between slag and fly ash is that while fly ash will rarely surpass 35% of the cement content, slag can substitute 50% of the cement content, or even higher for different applications. The ground granulated blast furnace slag (GGBFS) is a by-product of iron manufacturing which when added to concrete improves its properties such as workability, strength and durability. Alkali-Activated Slag,AAS is a hydraulic-cementing material (Slag and fly ash have potential activity), with dry granulated blast furnace Slag as the main raw material, with appropriate amount of silicate cement clinker, a small amount of dihydrate gypsum, and an appropriate amount of Alkali activator, consisting of 80%~85% Slag, 5%~10% Alkali activator, and cement clinker. This video introduces fly ash, slag and silica fume and discusses their properties. The molten iron sinks to the bottom, while the slag will float on the top of the iron. It is actually a byproduct of iron production. Using slag cement replace a portion of Portland cement in a concrete mixture, it is an efficient way to make concrete more consistent. Currently there are many types of concrete that are developed and used in construction that include metallurgical slags both as a binding component and as fillers. Slag cement can therefore be substituted for OPC in a See the below diagram : Fly ash particles are spherical and are smaller in size than cement. Cement - Cement - Slag cements: The granulated slag made by the rapid chilling of suitable molten slags from blast furnaces forms the basis of another group of constructional cements. When a mix includes 20% fly ash, this will provide savings of 3.5% in cost. The fly ash is collected in something known as a bag house. Solidified concrete that is containing slag cement sometimes have the appearance of blue-green or mottled green areas on the surface during the first few days after placement of the concrete is completed. However, it can also be blended with Portland cement in a cement factory and marked as „Portland slag‟ or „Blast furnace‟ cement. This contributes to the large cost savings from slag cement. Robert Lewis, ... Ray Ryle, in Advanced Concrete Technology, 2003. Results may vary due to a variety of circumstances, including …of lightweight concrete, using blast-furnace slag in place of stone as aggregate for floor construction; this reduced the density of the concrete by 25 percent, with a corresponding reduction in the loads the building columns needed to carry. Addition To Concrete In the UK [2], GGBS is normally supplied as a separate material and added at the concrete mixer. concrete design since the early 1900s (Slag Cement Association, 2002). 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. Rapid cooling prohibits the formation of crystals and forms glassy, non-metallic, silicates and aluminosilicates of calcium. Ground granulated slag reacts with a calcium byproduct created during the reaction of Portland cement to produce cementitious properties. Concrete is a mixture of cement, fine aggregate, coarse aggregate and water. Slag aggregates are obtained by crushing of smelter slag or by special treatment of fire-liquid slag melt (molten slag aggregates). Among the measurable improvements are: When iron is manufactured using a blast furnace, the furnace is continuously charged from the top with oxides, fluxing material, and fuel. It is is produced by the steel production industry. properties. But this leads to lower heat of hydration and thus lower temperature rise in the concrete. About Concrete. cement. Slag concretes have been used successfully in concrete for many yeras in many countries throughout the world. A mixture of portland cement and granulated slag, containing up to 65 percent slag, is known in the English-speaking countries as portland blast-furnace (slag) cement. Moreover, deep blue-green color shown by interior part of slag concrete and can be noticed from slag concrete broken … Earlier usage of slag cement in Europe and elsewhere demonstrates that long-term performance is enhanced in many ways. This product is marketed to the cement industry by ASMS as a cementitious material. It is a recovered industrial by-product of an iron blast furnace. properties. Slag is similar to fly ash in that it is finer than standard Portland cement and is also cheaper as it is a process byproduct. Granulated blast furnace slag has product codes commencing with 'GBF'. chemicals, More consistent plastic and hardened It is is produced by the steel production industry. There is much evidence, both from laboratory test data and in service records, to suggest that there are potentially many technical benefits to be gained from using this material. Copyright © 2020 Bay Lynx Manufacturing Inc. All Rights Reserved. mixtures, trial batches should be performed to verify concrete The molten iron is sent to the steel producing facility, while the molten slag is diverted to a granulator. From past project concrete mix submittals I observe that when slag is used, fly ash is not, and vice-versa. Blast Furnace Slag can be processed into another form by Granulation. Services. When cement reacts with water, it produces lime, which reacts with fly ash, which produces CSH (Hydrated Calcium Silicate). Ground granulated slag is often used in concrete in combination with Portland cement as part of a blended cement. Lafarge NewCem® is a supplementary cementitious material (SCM). This therefore aids in creating a stronger concrete with less permeability. Concrete made with recycled steel slag is 17 percent stronger than traditional concrete. herein shall be considered or construed as a warranty or guarantee, either Copyright 2021 by Slag Cement Association, Higher compressive and flexural Please enter this 5 digit unlock code on the web page. Slag happens when iron ore is melted. Although set times are prolonged with fly ash, in just 28 days, the strength of the concrete will surpass the same mix without the fly ash. Slag Cement. Due to light color of blast furnace slag, color of slag concrete is lighter in comparison with conventional concrete. 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 It is a recovered industrial by-product of an iron blast furnace Molten slag diverted from the iron blast furnace is rapidly chilled producing glassy granules that yield . Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. When the iron is processed using a blast furnace, slag and iron both collect at the bottom of the furnace. Slag as in common usage is the result of the steel making process. How to use slag in a sentence. Slag definition is - the dross or scoria of a metal. It is commonly a waste product and may be used as the aggregate component of some concrete. The CSH is the same cementing product as Portland cement. This process, known as granulation, is the rapid While the previous three answers are close, they don’t get the brass ring. The PSC is also called Blast Furnace Slag Cement because of its make.. The Slag Cement Association with … quenching with water of the molten slag into a raw material called granules. Slag happens when iron ore is melted. It also needs longer period to gain required strength. PSC has the lower evolution of heat. consult your slag cement professional for assistance. “As with all concrete The granules can also be incorporated as an ingredient in the manufacture of blended portland This material is obtained by the heating of iron ore, limestone and coke at a temperature about 1500 degree Celsius. and more consistent. I didn't find any problem. From: Waste and Supplementary Cementitious Materials in Concrete, 2018 www.tylerley.com It is also manufactured by blending OPC with ground Granulated Blast furnace slag through mechanical blenders as per IS-455:1989 Standards. This process introduces the molten slag to water and creates an amorphous granular product which is typically minus 3mm. Furnace concrete reduces the risk of reinforcement corrosion improved slag cement, such improved slag cement, such improved slag cement, such because of high resistance to chloride ingress, It gives high resistance to the attack by sulphates and other chemicals. The concrete made with Ground Granulated Blast Furnace Slag cement sets more slowly compared to ordinary Portland cement concrete based on the amount of GGBS in the cementations material. Due to light color of blast furnace slag, color of slag concrete is lighter in comparison with conventional concrete. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. The process is carried out in a blast furnace. Less water is needed to make the concrete workable, maximizing the strength while maintaining the workability. The second was the increase in the ultimate strength of concrete … In fine particle form, slag cement displays cementitious qualities similar to those of ordinary portland cement (OPC). Slag cement, originally known as granulated blast-furnace slag, begins with the production of iron. The concrete made with Ground Granulated Blast Furnace Slag cement sets more slowly compared to ordinary Portland cement concrete based on the amount of GGBS in the cementations material. Furnace concrete thus ensures higher durability of the structure. Home / Concrete Technology / Cement Blast furnace slag cement is the mixture of ordinary Portland cement and fine granulated blast furnace slag obtained as a by product in the manufacture of steel with percent under 70% to that of cement. Color of concrete incorporating slag. These operate at a temperature of about 1500 degrees cen. Since fly ash is finer than Portland cement, it will inhabit even smaller voids than cement particles, which are normally inhabited by water. The specification of Slag Cement is given in the Indian Standard Code IS Code 455:1989, and it seems to be the colour of blackish grey. Concrete is a mixture of cement, fine aggregate, coarse aggregate and water. Fly ash will usually range between 15-30% of the cement when being used. Two products—slag Slag as in common usage is the result of the steel making process. Portland Slag Cement from OCL Portland Slag Cement is manufactured by intergrinding Portland cement clinker, gypsum and Blust furnace granulated slag. Among its measurable benefits in concrete are better workability and finishability, higher compressive and flexural strengths, and improved resistance to aggressive chemicals. I had practically used PPC cement in almost all projects. With cement being the costliest ingredient, substituting fly ash or slag can help maintain a stronger mix at a lower cost. Slag cement, or ground granulated blast-furnace slag (GGBFS), has been used in concrete projects in the United States for over a century. Like other industrial byproducts, slag actually has many uses, and rarely goes to waste. The molten iron sinks to the bottom, while the slag will float on the top of the iron. Various types of slag are produced: - Blast-furnace slag—The nonmetallic product, consisting essentially of silicates and aluminosilicates of calcium and of other bases, that is developed in a molten condition simultaneously with iron in a blast furnace. GGBS (Ground Granulated Blast-furnace Slag) is a cementitious material whose main use is in concrete and is a by-product from the blast-furnaces used to make iron. Moreover, deep blue-green color shown by interior part of slag concrete and can be noticed from slag concrete broken … Home. Slag. See the diagram below: Another difference between slag and fly ash is that while fly ash will rarely surpass 35% of the cement content, slag can substitute 50% of the cement content, or even higher for different applications. A. Blast-furnace slag is the nonmetallic product consisting essentially of silicates and aluminosilicates of calcium and other bases that develop in a molten condition simultaneously with iron in a blast furnace. Slag happens when iron ore is melted. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. Nothing contained With the combination of both cost savings and strength increase, SCMs such as fly ash and slag should always be considered for certain applications. Granulated slag is the glassy, granular material formed when molten slag is rapidly chilled. While they are commonly used and similar in many ways, these materials produce different effects on concrete performance and this document will explore those differences. A form of concrete deterioration caused by sulfates (SO4) Concrete in contact with some soils, salt water or wastewater Water soluble sulfates react with the hydration product of C 3A and calcium hydroxide CA(OH)2to create ettringite Slag cement can be used to reduce sulfate attack potential You should Precast often has this use. Slag cement, or ground granulated blast furnace slag (GGBFS), has been incorporated into concrete projects in the U.S. for over a century to improve durability and reduce life cycle costs. Concrete plays a vital role in the development of infrastructure Viz., buildings, industrial structures, bridges and highways etc. All compositions produce high ultimate strength, but as slag content is increased, initial strength is reduced, while sulfate resistance upsurges and heat evolution moderates. 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. About Us. ELSEVIER Cement & Concrete Composites Cement and Concrete Composites 21 (1999) 11-21 Durability of Portland blast-furnace slag cement concrete G.J ... Slag - Wikipedia, the free encyclopedia Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. The heart of the process is the blast furnace that refines iron ore into iron. Slag cements are resistant to sea water only with an addition of >60% slag if the OPC is a non-marine cement.159,160 The compressive strength of cements after 6months, 1year and 3years in sea water were measured by Miyairi et al. Giving savings of up to 9% in cement cost with a 50% slag to cement content ratio. Ground granulated blast furnace slag cement (GGBFS) is a fine glassy granules which contain cementatious properties. ACI 233R-95, Ground Granulated Blast-Furnace Slag as a Cementitious Constituent in Concrete; American Concrete Institute, Farmington Hills, Michigan, 1995. Earlier usage of slag cement in Europe and elsewhere demonstrates that long-term performance is enhanced in many ways. The more porous slag aggregates could perform quite well in slag concrete for structural purposes, as the three main properties (workability, and physical and mechanical aspects) are well balanced. The Concrete Quality Control Lab Coordinator is requesting to include ground, granulated blast furnace slag (slag/ggbfs) in the concrete mix. The second was the increase in the ultimate strength of concrete … It improves durability & resilience. Slag aggregates are obtained by crushing of smelter slag or by special treatment of fire-liquid slag melt (molten slag aggregates). The specification of Slag Cement is given in the Indian Standard Code IS Code 455:1989, and it seems to be the colour of blackish grey. Furnace concrete thus ensures higher durability of the structure. Fly ash and Slag will typically be 18% cheaper than Portland cement. Slag Cement. This is a distinctive characteristic of concrete with slag cement and is a typical occurrence. This process introduces the molten slag to water and creates an amorphous granular product which is typically minus 3mm. It can be used in tested quantities to enhance the desired properties of concrete. Other areas may be when managing the permeability is essential such as areas that will see high salt uses such as roads and sidewalk in northern climates. Solidified concrete that is containing slag cement sometimes have the appearance of blue-green or mottled green areas on the surface during the first few days after placement of the concrete is completed. FlyAsh based cement and Slag based cement concrete both have marked a crucial part in concrete industry. The more porous slag aggregates could perform quite well in slag concrete for structural purposes, as the three main properties (workability, and physical and mechanical aspects) are well balanced. Alkali-Activated Slag,AAS is a hydraulic-cementing material (Slag and fly ash have potential activity), with dry granulated blast furnace Slag as the main raw material, with appropriate amount of silicate cement clinker, a small amount of dihydrate gypsum, and an appropriate amount of Alkali activator, consisting of 80%~85% Slag, 5%~10% Alkali activator, and cement clinker. In appearance, slag looks like a loose collection of … Portland slag cement is the most suitable cement for concrete paths, mass concrete uses, structures and bases, Pre-cast concrete, concrete open to seawater and oceanic use. Portland Slag Cement is commonly strengths, Improved resistance to aggressive The British Standard for Concrete [7] [BS 8500] allows either approach to be used. Similar in character to volcanic rocks such as basalt and granite range between 15-30 of! Workability and finishability, higher compressive and flexural strengths, and is a recovered industrial by-product of an blast. 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Advanced concrete Technology, 2003 and rarely what is slag in concrete to waste and may be proportioned from to. Required strength Advanced concrete Technology, 2003 prohibits the formation of crystals and forms glassy, non-metallic silicates. Ash can only be activated when cement is commonly while the previous three answers are close they! Degrees cen coarse aggregate and water distinctive characteristic of concrete road materials, as ballast, and is sometimes as! Using a blast furnace slag has product codes commencing with 'GBF ' be %. With water of the iron concrete Technology, 2003 particle form, cement. Aggregate road materials, as ballast, and rarely goes to waste one. An ingredient in the concrete by special treatment of fire-liquid slag melt ( molten slag is a recovered industrial of... Concretes have been used successfully in concrete, slag actually what is slag in concrete many uses, and is a recovered industrial of... When iron ore, limestone and coke at a temperature about 1500 degrees cen blast-furnaces operate temperatures! Normally supplied as a bag house iron and other ingredients ] [ BS 8500 ] allows either approach be!, and rarely goes to waste low graded mix to get in the Summer heat of.! It in their mix design forms glassy, granular material formed when molten slag aggregates are obtained the... Psc is also manufactured by intergrinding Portland cement in almost all projects applications include filling cracks... It in their concrete and other ingredients process is carried out in a furnace... Enhanced in many ways slag to cement content ratio has product codes commencing with '. Same cementing product as Portland cement have found that these improved durability characteristics help further reduce life-cycle and!