Concrete Structures: [NG] Concrete [2006]

วันอังคารที่ 27 ธันวาคม พ.ศ. 2554

[NG] Concrete [2006]

Next MegaStructures : www.youtube.com Video courtesy of National Geographic Channel. What is exactly concrete? Concrete is a composite construction material, composed of cement (commonly Portland cement) and other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate made of gravel or crushed rocks such as limestone, or granite, plus a fine aggregate such as sand), water, and chemical admixtures. The word concrete comes from the Latin word "concretus" (meaning compact or condensed), the perfect passive participle of "concrescere", from "con-" (together) and "crescere" (to grow). Concrete solidifies and hardens after mixing with water and placement due to a chemical process known as hydration. The water reacts with the cement, which bonds the other components together, eventually creating a robust stone-like material. Concrete is used to make pavements, pipe, architectural structures, foundations, motorways/roads, bridges/overpasses, parking structures, brick/block walls and footings for gates, fences and poles.Original Air date on 2006-03-16.Featuring the World's most used building material(concrete). Read More : en.wikipedia.org inventors.about.com www.simscience.org www.concretenetwork.com www.nanocem.org Episode Guide : channel.nationalgeographic.com www.imdb.com en.wikipedia.org For full support please buy their original DVD. [NO COPYRIGHT INFRINGEMENT INTENDED!] Please read: the use of any copyrighted material is used under ...