Concrete is a composite construction material composed primarily of aggregate‚ cement‚ and water. There are many formulations‚ which provide varied properties. The aggregate is generally a coarse gravel or crushed rocks such as limestone‚ or granite‚ along with a fine aggregate such as sand. The cement‚ commonly Portland cement‚ and other cementitious materials such as fly ash and slag cement‚ serve as a binder for the aggregate. Various chemical admixtures are also added to achieve varied properties
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of Concrete and their Sustainability Concrete was first made with fragments of stone or sand mixed with cementatous materials and water. Concrete has changed over the many years and today it is made with basically the same materials‚ but the main differences between concrete when it was first made and now‚ is the concretes strength and that it is produced in larger amounts. Some of the different types are: • Reinforced concrete • Prestressed concrete • Pre-cast concrete • Concrete Masonry
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Foam concrete advantages Foam Concrete is normal concrete with bubbles of air inside. Therefore it has the same characteristics with many additional advantages. CLC (foam concrete) blocks are used for building cottages‚ wall insulation in multistory buildings and internal partitions. Also CLC can be produced and poured for floors and roofs on-site. In roofs it can be used because of very good insulating and lightweight. For floors CLC offers faster installation and a less expensive option because
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www.jntuworld.com www.android.jntuworld.com www.jwjobs.net Code No: R31013 R10 Set No: 1 III B.Tech. I Semester Regular Examinations‚ November/December - 2012 CONCRETE TECHNOLOGY (Civil Engineering) Time: 3 Hours Max Marks: 75 Answer any FIVE Questions All Questions carry equal marks ***** Assume missing data suitably 1. (a) Describe the oxide composition of Ordinary Portland Cement. (b) What are the main compounds into which the above oxides will transform in the process of fusion
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Concrete and Steel Testing BIP Geotechnical and Material Testing Engineers and Water Supply Bakakeng‚ Baguio City In the construction‚ it is better to know the strength of concrete and steel to be used especially in a high rise building. Our Laboratory No. 1 for this Midterm is to determine the slump of freshly concrete mixed with Portland cement concrete‚ the strength and the mixtures of the concrete. July 27‚ 2012‚ we performed our laboratory. We the second group‚ use crushed aggregates
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POLYMER COCNCRETE 1. Introduction Despite being thought of as a modern material‚ concrete has been in use for hundreds of years. The word concrete comes from the Latin concretus‚ which means “mixed together” or compounded. Concrete is an extremely popular structural material due to its low cost and easy fabrication. Concrete is made up of sand or stone‚ known as aggregate‚ combined with cement paste to bind it. Aggregate can be of various sizes. It is broadly categorized as fine (commonly
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placed in a cube and allowed to dry forming the concrete testing cube. Each of the four blocks containing different compositions of each material were then placed in a compressive testing machine and when each cube yielded‚ results were taken. Effect of water content on workability of fresh concrete: As more water was added to the dry mixture‚ it became easier to work with but we had to be careful not to add to much water or this would weaken the concrete and possible ruin the mixture. If you wanted
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The greatness of Roman architecture is built‚ quite literally‚ upon the foundation of two important items: the discovery of concrete and the adoption of the arch from the Greeks. Concrete was an exceptional development within the Roman world and catapulted Roman construction into new heights of efficiency and stability. According to Kamm (1995)‚ the origin of Roman concrete can be found in a volcanic earth known as pozzolana‚ initially found near the Greek settlement of Puteoli. It would later be
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Procedure for mixing concrete 1. Weigh out the designed proportions for a 1.6 cubic foot batch of concrete. a. Divide the water into two buckets‚ one with about 3/4 of the water. If using air entraining‚ put the air entraining agent in the 3/4 water bucket. 2. Put about half the coarse aggregate‚ half the fine aggregate and the 3/4 bucket of water with air entraining in the mixer. 3. Start the mixer and mix until the aggregate is thoroughly wet 4. Carefully add all the cement with the mixer
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BRE Concrete mix design method A popular simplified mix design method is that from BRE. Compressive strength is‚ in general‚ related to durability. The greater the strength the more durable the concrete. To satisfy the required compressive strength‚ a value for water/cement (w/c) ratio is estimated for an appropriate test age (generally 28 days) and cement type. Tables in the BRE mix design handbook are consulted relating aggregate:cement (a/c) ratio‚ workability and water:cement (w/c) ratio for
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