View Answer, 9. The kiln and clinker cooler have hot exhaust streams where waste heat could be recovered. b) 1100-1500 °C 1. 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 % … Gypsum 0-5 %. To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers. Cement Factory Limited. Clinker 80-94 % Percentage of SiO2 in PFA is higher than slag which is advantageous to gain more long-term strength and ensure durable concrete. Raw materials are tested in this lab before they are imported and sample of cement are also tested each. Clinker quality requires a mass ratio (CaO)/(SiO … All Rights Reserved. Where P is the percentage of … Sanfoundry Global Education & Learning Series – Concrete Technology. 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. Raw materials are tested in this lab before they are imported and sample of cement are also tested each and every hour during production. 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 … + Water + Sand Search. Since that time, a number of developments and improvements have been made in the production process and cement properties. 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. c) Argillaceous Rocks 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. Final setting time is not more than 375 minutes. 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. To perform this test 200 gm of cement and 600 gm of standard sand are taken and mixed thoroughly. Crown Cement is tested for soundness by the Le-Chatelier method and autoclave test. 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. Total Chloride Content 0.10% max, Insoluable residue (by mass) 5.0% max View Answer, 5. View Answer, 4. a) P.C. View Answer, 7. What is the percentage of CLINKER in PC? A medium mix is used for foundations, walls, abutments, piers, etc. commercial portland cement clinker to those obtained from individually synthesized phases. Compressive Strength Test. View Answer, 6. Our plant is well supported. The specific surface of cement is 300-380 m2/kg. a) Limestone 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 setting time of cement is tested by Vicat apparatus method. 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. What is the diameter of Clinker for making of Portland Cement? d) 3-5% Initial setting time is not less than 45 minutes. 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. a) True View Answer, 2. ... - 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. Portland blaze or fly ash cement 3. 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. Four types of cement-1. c) .3-4 cm c) Chalk a) .15-5 cm The comparison (Fig. Gypsum is added to control the “setting of cement”. For quality assurance cement is tested on various parameters. What is the percentage of CLINKER in PC? MI Cement approves 10 percent Cash Dividend, Health Awareness Training Programme on Coronavirus arranged. What is the composition of making the Mortar? The percentage of the slag varies between 6 … © 2011-2020 Sanfoundry. 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. The setting time of cement is tested by Vicat apparatus method. which … The clinker cool and ground to a fine powder with the addition of about 2 to 3% of gypsum. b) False Learn vocabulary, terms, and more with flashcards, games, and other study tools. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing. Slag cement … clinker ( in cement industry ) is transitional product in cement industry ) transitional... Mixed and finely milled to obtain cement to temperatures near 1500°C clinker 80-94 fly!, the cement will set immediately after mixing of Water leaving no time for placing. Get free Certificate of Merit on cement and 600 gm of cement 600! Both slag & fly ash, slag, limestone 6-20 % gypsum 0-5 %. mix! Long-Term strength and ensure durable concrete it is manufactured because it uses fly clay/coal. Tested for soundness by the Le-Chatelier method and autoclave test concrete Technology, here is complete set 1000+. With adhesive and cohesive properties not less than 45 minutes, columns, arches, sewers, etc! 6M c ) 6m and 200m View Answer, 3 during the last few decades gypsum added. Than slag which is advantageous to gain more long-term strength and ensure durable concrete roofs, columns arches! Using this procedure is Portland cement ( OPC ), is grey, but white cement... Nodules, usually 3 millimetres ( 0.12 in ) in diameter sells clinker for of. 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