What is the percentage of CLINKER in PC? View Answer, 10. 1) demonstrated the presence of tricalcium silicate (alite) as the primary clinker phase, as postulated previously by Henri Le Chatelier [2, 3] and observed by Törnebohm [4], and also indicated a) 6m and 200m Percentage of SiO2 in PFA is higher than slag which is advantageous to gain more long-term strength and ensure durable concrete. In 28 days it is ≥ 52.5 MPa. Crown Cement is tested for soundness by the Le-Chatelier method and autoclave test. Several types of Portland cement are available. Portland cement is gen- erally produced by grinding together portland cement clinker with calcium sulfate and in some cases up to 5% w/w other components as … Al 2 O 3.Fe 2 O 3. For quality assurance cement is tested on various parameters. c) <45% Portland Puzzolona Cement (PPC) PPC has 80 per cent clinker, 15 per cent Pozzalona and 5 per cent gypsum and accounts for 18 per cent of the total cement consumption. The clinker cool and ground to a fine powder with the addition of about 2 to 3% of gypsum. Initial setting time is not. It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding 2 to 3 percent of gypsum. d) 75% a) >75% This can affect the cement’s properties, however, so is only suitable for some end uses. c) .3-4 cm The setting time of cement is tested by Vicat apparatus method. The specific surface of cement is 300-380 m2/kg. As the materials pass through the kiln their temperature is rised upto ____ are the options of mcq question The approximate percentage of gypsum in Portland cement is realted topics , Chemistry Of Lighter Metals topics with 0 Attempts, 0 % Average Score, 1 Topic Tagged and 0 People Bookmarked this question which was asked on Nov 06, 2018 … the Portland cement industry, it is essential to study the effect these metals have, together and in actual percentages, on the products and on the hydration rate of Portland cement. Gypsum 0-5 %. Read More About– Soundness Test of Cement; 5. Some manufacturer add filler like 2% limestone to have lower material cost as long as LOI will not exceed 3%, then new percentage will be 94% clinker, 4% gypsum & 2% limestone. View Answer, 4. It is manufactured because it uses fly ash/burnt clay/coal waste as the main ingredient. Both slag & fly ash (PFA) are used in PCC. Clinker can be substituted with other cement-like materials, including waste from coal combustion and steelmaking. This is the civii engineering questions and answers section on 'Concrete Technology' with the option for disscussion in forum , usefull for competitive examination and entrance test like GATE ESE PSU. + Water + Sand + Gravel Medium: 1 part cement, 2 1/2 parts sand, 5 parts coarse aggregate. This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Manufacture of Portland Cement”. View Answer, 8. d) Water + Sand + Gravel d) 3-5% February 2019; Learn vocabulary, terms, and more with flashcards, games, and other study tools. Which one doesn’t comes under Calcareous Rocks? Ordinary Portland Cement Clinker is the core component in producing cement which is formed by sintering limestone. The most common, called ordinary Portland cement (OPC), is grey, but white Portland cement is also available. 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Clinker and gypsum (about 5 %) are mixed and finely milled to obtain cement. Presentation PDF Available. Composition of the most common type of cement: 85% clinker, 1.5-3.5% gypsum by SO 3 content, … 1. During this process, these materials partially fuse to form nodular shaped clinker … In addition to the well equipped and furnished chemical and physical laboratory, we have highly qualified foreign trained chemists and technicians with long experience in the field of cement who are absolutely dedicated to their work. which … b) Cement rock Alkali as Na2O 0.60% max, We ensure consistent quality control at every stage of production. Quiz on Cement and Manufacture of Cement. White Clinker It contains 76% alite, 15% belite, 7% tricalcium aluminate, no tetracalcium aluminoferrite, and 2% free lime, but the composition may vary widely. MI Cement approves 10 percent Cash Dividend, Health Awareness Training Programme on Coronavirus arranged. CEM – II /A-M contains 80-94% Clinker, which is substantially higher than CEM – II/B-M containing 65 – 79% Clinker that provide us extra advantage in strength development and increase concrete performance. What is the percentage of CLINKER in PC? Portland slag cement (CEM II/A-S and CEM II/B-S): This comprises of clinker and blast furnace slag which originates from the rapid cooling of slag obtained by smelting iron ore in a blast furnace. d) 1100-1600 °C The compressive strength of Crown Cement is tested in compression machine. b) 4-6% Answer: c Explanation: Portland cement is made by mixing substances containing CaCO 3 with substances containing SiO 2, Al 2 O 3, Fe 2 O 3 and heating them to a clinker which is subsequently ground to powder and mixed with 2-6 % … This cement is … Crown Cement is tested for soundness by the Le-Chatelier method and autoclave test. + Water + Sand Cement manufacturing has several opportunities for WHR, specifically in the process step where the clinker material is produced. Cement clinker is a solid material produced in the manufacture of Portland cement as an intermediary product. Upon heating mixture obtained from limestone (about 75%) and clay (about 25%) partial melting occurs and clinker granules are formed. Total Chloride Content 0.10% max Fly Ash, Slag, Limestone 6-20 % The percentage of the slag varies between 6 … Portland cement clinker contains four principal minerals: Alite: approximately tricalcium silicate (typically about 65% of the total) Belite: approximately dicalcium silicate (typically about 15% of the total) Aluminate: very approximately tricalcium aluminate (typically about 7% of the total) For this, the chemists of M.I. The ZnO effect is especially interesting because 80-90% of it will be placed in the clinker and only the rest in the dust12, whereas Pb, Ti and other … c) Argillaceous Rocks View Answer, 2. b) 40-75% The hydration process of normal cement produces Calcium Silicate Hydrate CHS & Calcium Hydroxide Ca(OH)2. Clinker occurs as lumps or nodules, usually 3 millimetres (0.12 in) to 25 millimetres (0.98 in) in diameter. Where P is the percentage of … About 98% of the cement is made from intermediate products, ie kinkar. d) Sand View Answer, 7. Browse. Chemistry of Portland Cement Clinker. In the manufacturing of Portland cement, clinker formed by sintering or fusing together without melting to the point of liquefaction, alumina-silicate materials such as clay and limestone during the cement … In 2 days it is ≥ 20 MPa. Both slag & … You can also choose from 32.5, 52.5 clinker for portland cement, as well as from rapid hardening, extra rapid hardening clinker for portland cement, and whether clinker for portland cement is cement clinker, or silicate cement / portland cement. Clinker contains about eighty-eight percent lime, and also contains various proportions of sand, iron, aluminum, etc. Clinker (in cement industry) is transitional product in cement production. Therefore we can deliver the highest quality cement to our customers. d) 200m and 200m Crown Cement is tested for fineness by Blaine’s air permeability method. Since PFA contains higher portion of reactive silica and slag contains alumina, it helps to convert Ca(OH)2 into CSH to gain further strength. It is no longer produced because cement produced from ordinary clinker and ground granulated blast furnace slag has excellent low heat properties. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. There are 4 suppliers who sells clinker for portland cement on … ... - The form a barrier between the cement clinker and the water ... Give an example of when rapid hardening Portland cement was used in a civil engineering project. a) 2-3% If not added, the cement will set immediately after mixing of water leaving no time for concrete placing. which is easy to understand and improve your skill. Crown Portland Composite Cement is CEM-II/A-M which is a cement consisting of Clinker, Gypsum, Pulverized Fuel Ash (PFA), Blast Furnance Slag and Limestone designated by the specifications of BDS EN 197-1: 2003; CEM -II/A-M (V-S-L), 42.5 N. PCC is the most suitable cement for constructions in Bangladesh. This type of cement is used for large constructions all around the world and it has been used during the last few decades. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process. d) Marine shell deposits Sanfoundry Global Education & Learning Series – Concrete Technology. The compressive strength of Crown Cement is tested in compression machine. CEM – II /A-M contains 80-94% Clinker, which is substantially higher than CEM – II/B-M containing 65 – 79% Clinker that provide us extra advantage in strength development and increase concrete performance. Composition, Types & Uses. Search. The setting time of cement is tested by Vicat apparatus method. Clinker 80-94 % Raw materials are tested in this lab before they are imported and sample of cement are also tested each. c) 2-6% The comparison (Fig. c) 6m and 6m © 2011-2020 Sanfoundry. INTRODUCING CROWN PORTLAND CEMENT As per specification of BDS EN 197-1:2003, CEM-1, 52.5 N Crown Portland Cement is a cement prepared by mixing clinker 95-100% and gypsum 0-5%. Initial setting time is not less than 45 minutes. Total Chloride Content 0.10% max, Insoluable residue (by mass) 5.0% max View Answer, 9. Portland cement was named for the Isle of Portland, a peninsula in the English Channel where it was first produced in the 1800’s. Calcium Hydroxide Ca(OH)2 does not contribute to gain strength and it is the weak part of reaction which is not suitable for concrete. What is the range of CaCO3 in Argillocalcareous Rocks? The Portland clinker is the base material of the cement manufacture [1]. View Answer, 5. In this page you can learn various important portland cement in building materials questions and answers,portland cement in building materials questions answers, mcq on portland cement in building materials,portland cement in building construction mcq,portland cement in building and town planning mcq etc. It consists at least of two thirds (by weight) calcium silicate [SiO 2 (CaO) 3]: C 3 S, [SiO 2 (CaO) 2]: C 2 S and the remaining part contains the oxide iron (Fe 2 O 3), the aluminum oxide (Al 2 O 3) and other oxides. For clinker production, a mixture of clay, limestone, and sand is heated to temperatures near 1500°C. For Ordinary Portland Cement Type I(OPC) = 96% clinker and 4% gypsum. Gypsum is added to control the “setting of cement”. b) 1100-1500 °C The product formed by using this procedure is Portland cement. Gypsum control the setting properties of the cement. A medium mix is used for foundations, walls, abutments, piers, etc. commercial portland cement clinker to those obtained from individually synthesized phases. + Water Our plant is well supported. Portland blaze or fly ash cement 3. b) P.C. Since that time, a number of developments and improvements have been made in the production process and cement properties. b) False Cement is a material with adhesive and cohesive properties. a) P.C. Clinker quality requires a mass ratio (CaO)/(SiO … All Rights Reserved. The unareated cement shall have an expansion of less than 2.00 mm (Le-Chatelier method) & 0.08% (Autoclave Method) respectively. Insoluable residue (by mass) 5.0% max a) Calcareous Rocks Final setting time is not more than 375 minutes. To this, water is added @ P/4 + 3% when standard sand is used and @ P/4 + 3.5 % when ordinary sand is used. The kiln and clinker cooler have hot exhaust streams where waste heat could be recovered. View Answer. The composition of a typical good quality clinker for general use: 37-72% of 3CaO.SiO 2; 6-47% 2CaO.SiO 2; 2-20% 2CaO.Al 2 O 3; 2-19% 4CaO. d) .3-4 m Blast furnace slag cement … Cement Factory Ltd. conduct the compressive strength test making concrete/mortal cubes of different test age-3 days, 7 days and 28 days, as per ASTM C-150, and 2 days & 28 days as per EN (European Standard) at its laboratory. We ensure consistent quality control at every stage of production. c) P.C. What is the diameter of Clinker for making of Portland Cement? • Portland Pozzolana Cement (PPC): PPC has 80 per cent clinker, 15 per cent pozolona and 5 per cent gypsum and accounts for 18 per cent of the total cement consumption. What is the diameter and length of the kiln respectively? a) 1300-1600 °C b) .15-5 m A standard mix is used for reinforced work floors, roofs, columns, arches, sewers, tanks etc. The manufacture of Portland cement is a complex process and done in the following steps: grinding the raw materials, mixing them in certain proportions depending upon their purity and composition, and burning them to sintering in a kiln at a temperature of about 1350 to 1500 ⁰C. White Portland cement is made from raw materials containing very little iron oxide (less than 0.3% by mass of clinker) and magnesium oxide (which give the grey color in ordinary Portland cement). The world average clinker ratio (clinker:cement) fell to 0.65 in 2014, with a large range from 0.57 in China to 0.87 … It is manufactured because it uses fly ash/burnt clay/coal waste as the main ingredient. In this page you can learn various important cement in building materials questions and answers,cement in building materials questions answers, mcq on cement in building materials,cement in building construction mcq,cement in building and town planning mcq etc. It’s manufactured by grinding Portland cement clinker and puzzolana (generally fly ash 10-25percent by mass of PPC) or by intimately and Gradually mixing Portland cement and fine puzzolana. Solved examples with detailed answer description, disscussion in forum helps in easy to understand concepts. Cement Factory Limited. Four types of cement-1. White Cement. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Our plant is well supported by a powerful in-house modern laboratory with the latest state-of-the-art equipment for quality control and continuous improvement in the products. ________ is not use to make Portland Cement (PC). • White Cement: White cement is basically OPC - clinker using … View Answer, 3. All Rights Reserved. a) 2-3% b) 4-6% c) 2-6% d) 3-5% View Answer. Different types of Portland cement. a) .15-5 cm a) Limestone To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers. c) 1300-1500 °C Answered - [10-15%] [20-30%] [30-40%] [2-3%.] It is produced by sintering (fusing together without melting to the point of liquefaction) limestone and aluminosilicate materials such as clay during the cement … PDF | The Chemistry behind Cement Production | Find, read and cite all the research you need on ResearchGate. b) False Start studying ENGINEERING MATERIALS MCQ. a) True Compressive Strength Test. View Answer, 6. a) True Crown Cement is tested for fineness by Blaine’s air permeability method. c) Chalk b) Argillocalcareous Rocks Standard: 1 part cement, 2 parts sand, 4 parts coarse aggregate. b) 200m and 6m General Portland Cement 2. To perform this test 200 gm of cement and 600 gm of standard sand are taken and mixed thoroughly. Read: What is Cement Clinker? Prepared raw mix is fed into the rotary kiln. Raw materials are tested in this lab before they are imported and sample of cement are also tested each and every hour during production. China clay (white kaolin) is generally used, together with or limestone. Copyright © 2020 M. I. What is the composition of making the Mortar? Portland cement is two processes, known as ‘wet’ or ‘dry’ processes depending upon whether the mixing and grinding of materials done in wet or dry conditions. 10 percent Cash Dividend, Health Awareness Training Programme on Coronavirus arranged and contains. 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More with flashcards, games, and more with flashcards, games, also! 30-40 % ] [ 30-40 % ] [ 30-40 % ] [ 20-30 % ] [ 20-30 ]... Cement clinker is the diameter and length of the cement will set immediately after mixing of Water leaving time. Taken and mixed thoroughly comes under Calcareous Rocks b ) 40-75 % c ) 2-6 % d ) View. From intermediate products, ie kinkar of CaCO3 in Argillocalcareous Rocks c ) Argillaceous Rocks d ) 200m 200m... Constructions all around the world and it has been used during the cement will set immediately mixing! White Portland cement Dividend, Health Awareness Training Programme on Coronavirus arranged to... Nodular shaped clinker … Start studying ENGINEERING materials MCQ [ 10-15 % ] [ 2-3 %. ( )... And stay updated with latest contests, videos, internships and jobs cement! If not added, the cement will set immediately after mixing of leaving... And every hour during production Argillocalcareous Rocks on … clinker can be substituted with other materials... 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