"Concrete" Essays and Research Papers

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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 concreteConcrete Masonry ...

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Concrete and Mold

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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Concrete Technology

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 repair

soil Vegetation Tool Kit for Engineers 4.10/ P/ 2 Non Structural cracks: Moisture Changes Building materials expand on absorbing moisture and shrink on drying. These are generally reversible. Shrinkage in concrete or mortar depends on a number of factors • Cement concrete: Richer the mix greater is the drying shrinkage. • Water content: More water in mix induces greater shrinkage • Aggregates : Large aggregates with good grading has less shrinkage for same workability as less water...

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Concrete Lab

past on these test is in th e following two points: 1. Difficulties in molding (Getting good specimens). 2. Large variability of test results. It is important that the resul tant mixture (Cement + sand + water) has the same properties as concrete. So the standard sand was chosen and the following properties were determined to it: 1. Consist of pure siliceous material. 2. The particles are nearly spherical shaped. 3. The size of its particles is smaller than 0.85mm (Pass through 15...

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Concrete Patio Project

Concrete Patio Project Adam Kroeger MG375 1 February 2008 STATEMENT OF WORK Concrete Patio Project Objective: To pour a concrete patio recreational are in my backyard. Start Date: April 1 2008 End Date: May 31 2008 Milestones: 1. Get measurements and draw a patio plan 2. Assess what materials I will need for this endeavor. 3. Purchase all supplies. 4. Build concrete form out of wood. 5. Dig flat area where patio will lay. 6. Prep patio area 7. Pour...

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Aggregates used in concrete

Aggregates is a major part of concrete, it is of urgent need that we look into the influence of aggregate on the fresh as well as hardened properties of concrete. Better grading of aggregate not only will show better results in the properties of the concrete but will also help in saving expensive materials such as cement, fly ash and admixture. ​ In the comparative study of influence of the aggregate on high strength concrete, here is an attempt to study strength characteristics of cubes and cylinders...

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concrete compressive report

Introduction Concrete mixtures can be designed to provide a wide range of mechanical and durability properties to meet the design requirements of a structure. The compressive strength of concrete is the most common performances measure used by engineer in designing buildings and other structures. The compressive strength is measured by breaking concrete specimen in a compression-testing machine. The compressive strength is calculated from the failure load divided by the cross-sectional area resisting...

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Concrete Case Study

placed between the two BS 5400 results, or close to the lower values. The Eurocode 2 results were usually reasonably close to the mean of the other results. The CEB-FIP-1990 results were consistently the lowest for high steel stresses and high concrete cover values. Results with varying spacing were close to Eurocode 2 results. The ACI 318 results were consistently the highest, being close to and slightly higher than the upper bound BS 5400 values. All crack widths increased approximately linearly...

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