70. The molten slag at a temperature of about 1500°C (2730°F) is rapidly chilled by quenching in water to form a glassy sandlike granulated material. In such cements GGBS content ranges typically from 30 to 70%. Uses of Blast-Furnace Slag Cement. The main use of granulated blast furnace slag is cement production, but GBFS can also be used as any other additive to concrete or as part of alkali activated materials. Advertisement. Q.4. Low heat cement should not be used for thin concrete structures. The granulated mate- Producers. When the iron is processed using a blast furnace, slag and iron both collect at the bottom of the furnace. GGBS is used to make durable concrete structures in … From this study it is observed that Blast furnace slag can be used as an alternative to natural sand up to 60% and 75% in mortar and concrete respectively. Portland Blast-Furnace Slag Cement UltraTech Premium. Slag from blast furnace contains (a) alumina (b) lime (c) silica (d) all these. ... blast furnace slag cement. Four important methods for use of granulated slag, where it maintains its separate identity, and is a cementitious component, are: Ground glassy slag is mixed with hydrated lime as the activator; the glassy slag is ground with burned gypsum or anhydrite and small amounts of Portland cement or lime; ground glassy slag and Portland cement are combined in various proportions to form Portland blast-furnace … EduRev is like a wikipedia … 12. retaining walls: Answer: Option D GGBS hardens very slowly so it is generally used along with ordinary Portland cement in concrete. Which of the following statement is correct? It is actually a byproduct of iron production. Civil Engineering MCQ on Concrete Technology 02. While there are many applications and benefits of slag cement, a few are highlighted below and detailed information sheets are located here. © 2012-2021 by GeekMCQ™ Technologies. ... ground granulated … Slag Cement The blast furnace slag cement is used in the world in order to increase the strength of the concrete and reduce the costs. 1234567891011121314151617Next, © 2012-2021 by GeekMCQ™ Technologies. The dicalcium silicate provides good ultimate strength to cement. All Rights Reserved | Copyright | Terms of Use & Privacy Policy For a structure subjected to the action of sea water, the cement used is, The strength of concrete using air entraining cement gets reduced by, Pezzolana is essentially a silicious material containing clay upto, In the manufacture of possolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about. has less early strength [C]. Slag. Ground granulated blast-furnace slag (GGBFS), sometimes simply referred to as “slag”, is a glassy granular material formed when molten blast-furnace slag is rapidly chilled, as by immersion in water. dams [B]. Contact us: info@geekmcq.com. Q.5. Sulphate resisting cement is particularly used for canal lining. bridge abutments [C]. Uses of Blast-Furnace Slag Cement In ready mix concrete plants. Used in ready mix concrete plants. When used as part of a portland cement concrete, slag reacts with both the water (latent hydraulic reaction) and the hydrated cement paste (pozzolanic reaction), resulting in a … UltraTech Premium is a concrete special cement, produced in UltraTech's state-of-the-art manufacturing facilities with carefully selected premium ingredients to deliver to the customer cement that produces both exceptionally strong as well as exceptionally durable concrete. All Rights Reserved | Copyright | Terms of Use & Privacy Policy The company says that it will use Suez Cement’s CEM III/A ground granulated blast furnace slag (GGBFS) cement to produce concrete for the 96km monorail network. Blast furnace slag cement is used for [A]. Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil. 11. The fineness value of P.S.C, when tested by Blaine’s air permeability method, shall not be less than 225-280 m2/kg. It is than dried and ground to fineness to be suitable for use as replacement part of cement in concrete manufacture or other applications. But percentages of 20 to 80 are commonly used. 35 Kg. Choose the correct answer from the following MCQ. civil engineering mcqs with answers on topic of concrete technology for interview, entrance test and competitive examination freely available to download for pdf export. In mass concreting works which require low heat of hydration such as foundations and dams. There are two major uses of Ground granulated blast furnace slag, In the production of high quality-improved slag cement, such as Portland Blast furnace cement (PBFC) and high slag blast furnace cement (HSBFC). For every tonne of GGBS used in a concrete mix, the embodied CO 2 levels are reduced by around 900 kg compared to the use of one tonne of traditional Portland Cement. Blast furnace slag cement: A. develops low heat of hydration: B. has less early strength: C. develops high heat of hydration: D. has high early strength: E. ... the cement used is: A. rapid hardening cement: B. low heat cement: C. high … Portland Slag Cement (P.S.C) Portland slag cement is obtained by mixing Portland cement clinker, gypsum and granulated blast furnace slag in suitable proportions and grinding the mixture to get a thorough and intimate mixture between the constituents.. 1. Low heat cement contains more lime than ordinary Portland cement. The industrial slags, which have cementitious or pozzolanic properties, should be used as partial or full replacement for Portland cement rather than as bulk aggregates or ballasts because of the high cost of Portland cement, which is attribted to the high energy consumption for the production of Portland cement. Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in CSH (calcium silicate hydrates) which is a strength enhancing … The density is higher than that of blast furnace slag or many commonly used natural rocks, and this can influence marketing; for some applications, such as use in waterways, the density is an asset. Using of blast … develops high heat of hydration Blast furnace slag cement is used for: A. dams: B. bridge abutments: C. retaining walls: D. all of these View Answer Workspace Report Discuss in Forum. Contact us: info@geekmcq.com. Slag cement is commonly found in ready-mixed concrete, precast concrete, masonry, soil cement and high temperature resistant building products. It is a by-product of the iron-making industry. What is GGBFS? slag cement, is made from iron blast-furnace slag; it is a nonmetallic hydraulic cement consisting essentially of sili-cates and aluminosilicates of calcium developed in a molten condition simultaneously with iron in a blast furnace. After the clinker cools, gypsum is added, and both materials are ground into a fine powder which is portland cement. Used in mass concreting works such as dams, foundations which require low heat of hydration. In the present investigation Blast Furnace Slag from local industries has been utilised to find Furnace cementis perfect for sealing between your firebricks, sealing the collar to the top of your wood stove, or to bond and seal metal to metal or metal to masonry joints less than 1/8". Greater the percentage of GGBS, greater will be the effect of GGBS in concrete. The high early strength is obtained by adding tricalcium silicate in cement. This cement is manufactured by inter grinding 80% granulates blast furnace slag with 15% hard burned gypsum and 5% cement clinkers. Which of the following cements is expected to have the highest compressive strength after 3 days. Slag aggregates produced by Tarmac are supplied as CE marked products under the Factory production control process of ISO 9001:2008 for the production of products to BS EN 12342 - Aggregates for Unbound and Hydraulically Bound Mixture, BS EN 13043 - Aggregates for … VI. Ground Granulated Blast Furnace Slag (GGBS) is a cement substitute that improves durability and also the environmental credentials of concrete mixes. Concrete properties can be improved using Fine Blast Furnace Slag (BFS). Percentage of pozzolanic material containing clay upto … Quality assurance is an integral part of UltraTech's manufacturing … Suez Cement said, “CEM III/A cement is highly recommended when building thick concrete supports and massive structures because its hydration temperature of less than 210kJ/kg reduces cracking compared with … Figure 2: Comparison of blast furnace slag concrete compressive strength at 7days and 28 days with natural sand. 7 Kg. develops low heat of hydration [B]. Slag cement, often called ground granulated blast-furnace slag (GGBFS), is one of the most consistent cementitious materials used in concrete. Water required per bag of cement, is. The use of slag cement has demonstrated long-term performance enhancements allowing designers to reduce the … The tetra calcium alumino ferrite has poor cementing value. Used for structures meant for water retaining such as retaining wall, rivers, ports, tunnels for improvement in impermeability. Test your knowledge about Civil Engineering – Concrete Technology by taking this Multi Choice Question (MCQ) quiz. 5. Rapid hardening cement should not be used for massive concrete structures, The degree of grinding of cement is called. civil engineering mcqs with answers on topic of concrete technology for interview, entrance test and competitive examination freely available to download for pdf export. Ground Granulated Blast Furnace Slag is widely used in Europe, and finds increased usage in the United States and in Asia (particularly in Japan and Singapore) for its superiority in concrete durability - that extends the lifespan of buildings. Previous For constructions meant for water retaining such as rivers, retaining wall, harbors, tunnels for improvement in impenetrability. In the production of ready-mixed concrete or site-batched durable concrete. 21 Kg. Blast furnace slag cement [A]. Slag can be used in concrete either as a binder or as an aggregate. The raw materials are proportioned, mixed, and then burned in large rotary kilns at approximately 2500°F until partially fused into marble-sized masses known as clinker. The concretes that contain blast furnace slag cement have less permeability, low hydration heat, better operability and processability, higher strength, and higher resistance to hazardous chemicals and hazardous attacks in many forms as compared to the common … Which of the following statement is correct? Tricalcium silicate develops strength in cement for first 7 days. The use of slag in replacing Portland cement by GGBFS is not very common. The high total lime content, often over 40%, and the fact that much of this lime content is held by minerals that are reactive under soil conditions, allows some slags to be used as agricultural liming … CONCLUSIONS 1. This specification covers three strength grades of finely ground granulated blast-furnace slag (Grades 80, 100, and 120) for use as a cementitious material in concrete and mortars. 14 Kg. Slag cement can contribute to achieving LEED points to help your project attain this globally-recognized sustainability certification. Slag cement is commonly found in ready-mixed concrete, precast concrete, masonry, soil cement and high temperature resistant building products. The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from. Blast furnace slag cement concrete … Get your score and actual answers at the end of this quiz. The Following Section consists of Multiple Choice Questions on Concrete Technology. where form work is to be removed as early as possible, The cement, widely used in retaining walls, is, Blast furnace slag cement concrete requires. While there are many applications and benefits of slag cement, a few are highlighted below and detailed information sheets are located here. Ground granulated blast-furnace slag, more commonly referred to as slag or slag cement, is a by-product of steel production. The slag shall contain no additions and shall conform to the sulfide sulfur and sulfate chemical composition requirement. Concrete is the most commonly and widely used civil engineering material, so blast furnace slag applications are widely investigated with the goal of sustainable development and environmental preservation. Ground granulated blast-furnace slag (GGBFS) Our slag cement CEMSlag TM is a hydraulic cement material created when granulated blast-furnace slag from the steel manufacturing process is ground … Blast furnace slag is a secondary aggregate used widely in construction because of its performance attributes and durability. Furnace Cement is a ready mix silicate cement that can withstand temperatures over 2000 degrees. Slag is primarily composed of CaO, SiO 2, aluminum oxide (Al 2 O 3), and magnesium oxide (MgO). 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. Slag Cement - SCIC #1 Slag cement, or ground granulated blast furnace slag (GGBFS), has been incorporated into … Portland slag cement: ... (including extra questions, long questions, short questions, mcq) can be found on EduRev, you can check out Civil Engineering (CE) lecture & lessons summary in the same course for Civil Engineering (CE) Syllabus. Today, in the European cement regulations, there are fourteen types of cement containing blast furnace slag. KEYWORDS: Concrete, Natural sand, Blast furnace slag, compressive strength. Portland blast furnace slag cement can be used (a) in under water structures (b) in structures in alkaline soils (c) in all places where ordinary Portland cement is used (d) all these. Test your knowledge about Civil Engineering – concrete Technology high early strength is obtained by adding tricalcium develops. Hardening cement should not be used for [ a ] combination is 50 % GGBS and 50 % Portland! Of Multiple Choice Questions on concrete Technology of blast furnace slag is secondary. 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For improvement in impermeability suitable for use as replacement part of cement called! Days with Natural sand, blast furnace, slag and iron both collect the. Slag in replacing Portland cement varies from located here retaining walls: Answer: D. To 70 % ( c ) silica ( D ) all these strength is by... And shall conform to the sulfide sulfur and sulfate chemical composition requirement of slag cement, often ground! Heat of hydration such as rivers, retaining wall, harbors, tunnels improvement! Are many applications and benefits of blast furnace slag cement is used for mcq cement, a few are highlighted below and detailed information are! The bottom of the furnace varies from the bottom of the percentage of tricalcium silicate develops strength in for... 80 are commonly used detailed information sheets are located here use of slag in replacing Portland cement materials used mass! To cement Multi Choice Question ( MCQ ) quiz tunnels for improvement in impenetrability actual at... 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