Allows the use of reactive aggregates with the following preventive measures: Limiting the alkali content of the concrete Use of fly ash Use of slag Use of silica fume Use of ternary …
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Uses of Blast-Furnace Slag Cement Used in ready mix concrete plants. Used for structures meant for water retaining such as retaining wall, rivers, ports, tunnels for improvement in impermeability. Used in mass concreting works such as dams, foundations which require low heat of hydration.
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In concrete, PLC also performs well with slag or fly ash at normal replacement levels. In many cases, Type IL+SCM perform better at early age than Type I+SCM, due to …
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— OPC prism performed the worst and showed around 0.1% expansion just after 9 months in Na 2 SO 4 . 60% GGBS composite was the second best performer, and 70% GGBS was the first best performer in the ...
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— 2. Introduction • Davidovits proposed that an alkaline liquid which can react with the silicon (Si ) and aluminum (Al) in a source material of geological origin or in by product material can be used to produce binders. • Alkali activated concrete constitutes of two main compounds namely source materials and alkaline liquids.
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Until the 1950s, slag cement was used in two basic ways: as a raw material for the manufacture of portland cement, and as a cementitious material combined with portland cement, hydrated lime, gypsum, or anhydrite ( 1981). Since the late 1950s, use of slag cement as a separate cementitious material added at the concrete mixer with
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— The use of waste items like silica fume, fly ash and ground-granulated blast furnace slag as a partial replacement for cement used in concrete has been considered a sustainable approach in the construction industry [13]. The amount of carbon dioxide gas emitted will be significantly reduced when GGBS is used in place of Portland cement.
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— 10. Uses Of GGBF Slag In Concrete • GGBS is used to make durable concrete structures in combination with ordinary Portland cement and/or other pozzolanic materials. • Two major uses of GGBS are in the …
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— 10. 2. Retarder (Cont.) Advantages of Retarders / Effect of retarders on concrete properties Retarding admixtures delay hydration of cement To delay or extend the setting time of cement paste in concrete. These are helpful for concrete that has to be transported to long distance, and helpful in placing the concrete at high temperatures. …
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The use of slag cement as a cementitious material dates back to 1774, when a mortar was made using slag cement in combination with slaked lime (Mather 1957). In 1862, a …
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— The required pretreatment time is affected by the volume expansion of slags. Autoclaving at a temperature above 175 °C for longer than 4 h is typically used for curing LF slag 56. The autoclave-cured LF slag is used in concrete and masonry mortars as a cement replacement.
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— The high slag crushing index of coarse aggregate can result in a limit slag content (20%), and the concrete strength can decrease with increasing slag rate. The lowest concrete strength of less than 30 Mpa appears when the fly ash replacement rate is 40% and the slag replacement rate is 40%.
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Slag can be used in concrete either as a binder or as an aggregate. As a binder, it can replace approximately 70–80 wt.% of Portland cement, with 9%–10% reduction of CO 2 emissions from concrete manufacturing for every 10% of Portland cement replaced [37]. Used as an aggregate, slag usually replaces fine grade aggregate and can improve the ...
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— The slag produced is referred to as High Sulphur slag, LD slag (Steel Furnace slag – SFS), LF slag, or Electric Arc Furnace (EAF) slag depending on the stage or type of steelmaking process. Steel slag, particularly LD and EAF Slag, is widely utilized for a variety of purposes in many nations throughout the world, including the United States ...
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— Once combined with cement in concrete mixes, it produces superior hardened concrete product. Benefits of Slag Concrete . Slag concrete can be advantageous for any of your upcoming construction projects. There are five main benefits: 1. Higher Workability and Finishability. Construction companies may prefer working with slag …
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Slag processing. George C. Wang, in The Utilization of Slag in Civil Infrastructure Construction, 2016 5.3 Blast furnace slag processing. Iron blast furnace slag results from the fusion of iron ore, fluxing materials, and coke; the reduction reactions; and the separation of iron from the ore. As indicated in Chapter 2, the term blast furnace slag is …
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— Abstract. Modern industrialization leads to an increasing demand for steel around the world, the production of one ton of crude steel generates a substantial …
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— Steel slag is the main source of solid waste in the steel industry [1]. It is obtained either by melting scrap with a high electric current in an electric arc furnace …
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The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a …
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ACI 201.2R-16: Updated Guidance on Concrete Durability ACI Fall Convention, Anaheim, CA, October 15, 2017 ... Use of slag Use of silica fume ... PowerPoint Presentation Author: Michael Thomas Created Date: 10/16/2017 5:59:12 PM ...
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The guide covers information on slag cement chemical properties and product types, storage, handling, batching, proportioning, and the effects on properties of fresh and …
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slag concrete is almost larger than that of plain concrete. The bigger the substitution ratio is, the larger the total pore volume will be. After 28 days, the total pore volume of slag concrete is almost smaller than that of plain concrete. It implies ; that the pozzolanic reaction of slag gets more apparent, and results in a strength enhancement.
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wearing surfaces and concrete. Since then two more detailed Guides have been produced relating to specific areas of slag usage:- A Guide to the Use of Iron Blast Furnace Slag in Cement and Concrete (1997),and A Guide to the Use of Steel Furnace Slag in Asphalt and Thin Bituminous Surfacings (1999)
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— Waste material concrete ppt - Download as a PDF or view online for free ... • The granulated slag can be used in the manufacture of slag cement. • Blast furnace slag cements contain slag up to 60%, hence there is considerable reduction in the rate of heat evolution and a significant increase in the resistance to chemical attack. 9.
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— Ground granulated blast-furnace slag (GGBS) is a green construction material used to produce durable concrete. The secondary pozzolanic reactions can result in reduced pore connectivity; therefore, replacing partial amount of Portland cement (PC) with GGBS can significantly reduce the risk of sulfate attack, alkali–silica reactions and …
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— It has been reported that the use of slag increases the paste volume caused by low relative density [50,51]. It has been reported that the compressive strength of slag concrete depends primarily upon the type, fineness, activity index and proportion of slag used in the concrete [49,52]. In general, slag-blended concrete develops lower strength ...
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— Current applications of steel slag in concrete were presented. • Its chemical composition and durability properties of steel slag in literature were compared. • Use of steel Slag as coarse and fine aggregate in concrete was presented. • Effect of curing temperature and time on concrete containing steel slag was presented. •
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— The use of steel slag aggregates in concrete by replacing natural aggregates is encouraging because their effect on concrete strength is greater than that of natural river sand. For this study, a normal strength (C-25) of concrete with 0%, 15%, 30%, 45%, and 60% replacement of steel slag was utilized for 3 days, 7 days, 28 days, and 56 days of ...
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— This chapter presents experimental and industrial experience with the use of steel slag and air-cooled blast furnace slag in the production of concrete as a new …
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— MansoJ, Polanco J, Losanez M, Gonzalez JJ. Durability of concrete made with EAF slag as an aggregate. Cement concrete compos 2006; 28(6):528-34. Li YF,Yao Y, Wang L. recycling of industrial waste and performance of steel slag green concrete. J Cent South Univ Tech 2009.p.419-26.
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— 1. Introduction. Steel slag is a by-product of steel manufacturing [].Approximately 160 kg of steel slag is generated per ton of steel produced [].The common chemical compounds in steel slag are …
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EAF (Electric Arc Furnace) slag is used as coarse aggregate and LFS (Ladle Furnace Slag) is used as filler and fine aggregate in a mixture, it shows better skid resistance performance since it has a higher British Pendulum Number than other mixtures [51]. 3.2 …
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The American Concrete Institute (ACI) has recently published ACI 233R-17 Guide to the Use of Slag Cement in Concrete and Mortar. As slag cement use is rising in the U.S., understanding how slag cement works best in various situations is increasingly important for contractors and engineers.The guide covers information on slag cement chemical …
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Use of Blast Furnace Slag Aggregate in Concrete K.G. Hiraskar and Chetan Patil Abstract-The Iron industries produce a huge quantity of blast furnace slag as by–product, which is a non–biodegradable waste material from that only a small percentage of it is used by cement industries to manufacture cement. In the present investigation Blast ...
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The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for …
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— In the two last decades, world production of pig iron and steel has undergone a significant increase. In 2018, 1252.87 and 1806.46 million tons of pig iron and steel, respectively, were produced as compared to the 575.78 and 809.94 million tons of 2000. Consequently, the amount of the different types of slags deriving from these production …
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