in Toronto, Ontario, Canada.]] in a floor slab during a concrete pour]] Concrete is a construction material that consists of cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such as gravel limestone or granite, plus a fine aggregate such as sand or manufactured sand and water) and chemical admixtures. Concrete solidifies and hardens after mixing 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 stone-like material. It is used to make pavements, architectural structures, foundation, motorways/roads, overpasses, parking structures, brick/block walls and footings for gates, fences and poles. Concrete is used more than any other man-made material on the planet.The Skeptical Environmentalist: Measuring the Real State of t

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # TAGS