- published: 09 Jun 2015
- views: 1614
Prestressed concrete is a method for overcoming concrete's natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete. Prestressing tendons (generally of high tensile steel cable or rods) are used to provide a clamping load which produces a compressive stress that balances the tensile stress that the concrete compression member would otherwise experience due to a bending load. Traditional reinforced concrete is based on the use of steel reinforcement bars, rebars, inside poured concrete. Video by Elecosoft plc: http://www.eleco.com/
Adrian Brugger, a civil engineer at Columbia's Carleton Laboratory, demonstrates the difference in protection between concrete structures with and without steel reinforcement, in this web exclusive. Subscribe for more from Engineering Disasters and other great HISTORY shows: http://www.youtube.com/subscription_center?add_user=historychannel Find out more about the show on our site: http://www.history.com/shows/engineering-disasters?cmpid=Social_YouTube_EnDisasters Stream full episodes here: http://www.history.com/shows/engineering-disasters/videos?cmpid=Social_YouTube_EnDisastersVid Check out exclusive HISTORY content: Website - http://www.history.com?cmpid=Social_YouTube_HistHome Twitter - https://twitter.com/history Facebook - https://www.facebook.com/History Google+ - https://plus.g...
http://stairs4u.com/glossary/c.htm Click on this link and visit our stairway glossary today. Watch this video to learn more about problems and builders face with concrete stairways. Sometimes all it takes as little more rebar or a little more soil compaction and a little more concrete, to make a stairway that will last for many years. For more information about stair building, visit our website today.
Disclaimer: This video is here for educational purpose & is exclusive property of Portland Cement Association (PCA). You must not reproduce or distribute it without written permission from PCA [http://www.cement.org]. Get a candid look at ten popular, but mistaken ideas that still exist in concrete construction. Using examples, interviews, and demonstrations, this revealing video from the Portland Cement Association exposes and explains the most common misconceptions associated with the cement and concrete industry. The video is designed as an educational training tool for workers of all experience levels. Portland Cement Association © 2005
The concrete slump test is an empirical test that measures workability of fresh concrete.The test measures consistency of concrete in that specific batch. It is performed to check consistency of freshly made concrete. Consistency refers to the ease with which concrete flows. It is used to indicate degree of wetness.
This video walks through checking and validating a structural concrete beam through hand calculations. The shear and moment diagrams are calculated and are compared to the results from Robot (3:18). The moment forces calculated are used to make a preliminary estimate of the required area of steel for flexure utilizing the previously discussed rules of thumb (7:20). Finally, the shear reinforcement is designed by referencing ACI Design Handbook for Design of Structural Reinforced Concrete Elements in Accordance with ACI 318-05, Figure 2.71 (9:50). Learn more and build your skills at the Autodesk BIM Workshop: http://bimcurriculum.autodesk.com/
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Honeycombs in concrete are voids found in finished concretes owing largely to poor compaction effort.Low work ability of concrete mix creates honeycombs as well. They shall be treated in a systematic way so that the strength and the durability of concrete structure are not effected.This video presents the introduction,reasons, resulting effects and a systematic remedial measure to treat honeycombs in concrete structures.
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The slump test is a means of assessing the consistency of fresh concrete. It is used, indirectly, as a means of checking that the correct amount of water has been added to the mix. The test is carried out in accordance with BS EN 12350-2, Testing fresh concrete.
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