Concrete is a composite material composed mainly of water, aggregate, and cement. Often, additives and reinforcements (such as rebar)
are included in the mixture to achieve the desired physical properties
of the finished material. When these ingredients are mixed together,
they form a fluid mass that is easily molded into shape. Over time, the
cement forms a hard matrix which binds the rest of the ingredients
together into a durable stone-like material with many uses.[2]
Famous concrete structures include the Hoover Dam, the Panama Canal and the Roman Pantheon. The earliest large-scale users of concrete technology were the ancient Romans, and concrete was widely used in the Roman Empire. The Colosseum in Rome was built largely of concrete, and the concrete dome of the Pantheon is the world's largest unreinforced concrete dome.[3]
After the Roman Empire collapsed, use of concrete became rare until
the technology was re-pioneered in the mid-18th century. Today, concrete
is the most widely used man-made material (measured by tonnage).
From - http://en.wikipedia.org/wiki/Concrete
Showing posts with label composite. Show all posts
Showing posts with label composite. Show all posts
Tuesday, 12 May 2015
Vitreous Enamel wiki definition
Vitreous enamel, also called porcelain enamel, is a material made by fusing powdered glass
to a substrate by firing, usually between 750 and 850 °C (1,380 and
1,560 °F). The powder melts, flows, and then hardens to a smooth,
durable vitreous coating on metal, or on glass or ceramics.
The term "enamel" is most often restricted to work on metal, which is the subject of this article. Enameled glass is also called "painted". Fired enamelware is an integrated layered composite of glass and metal.
The word enamel comes from the Old High German word smelzan (to smelt) via the Old French esmail,[1] or from a Latin word smaltum, first found in a 9th century life of Leo IV.[2] Used as a noun, "an enamel" is a usually small decorative object, coated with enamel coating.
Enameling is an old and widely adopted technology, for most of its history mainly used in jewelry and decorative art.
Since the 19th century the term applies also to industrial materials and many metal consumer objects, such as some cooking vessels, dishwashers, laundry machines, sinks, and tubs. ("Enamelled" and "enamelling" are the preferred spellings in British English, while "enameled" and "enameling" are preferred in American English.)
From - http://en.wikipedia.org/wiki/Vitreous_enamel
The term "enamel" is most often restricted to work on metal, which is the subject of this article. Enameled glass is also called "painted". Fired enamelware is an integrated layered composite of glass and metal.
The word enamel comes from the Old High German word smelzan (to smelt) via the Old French esmail,[1] or from a Latin word smaltum, first found in a 9th century life of Leo IV.[2] Used as a noun, "an enamel" is a usually small decorative object, coated with enamel coating.
Enameling is an old and widely adopted technology, for most of its history mainly used in jewelry and decorative art.
Since the 19th century the term applies also to industrial materials and many metal consumer objects, such as some cooking vessels, dishwashers, laundry machines, sinks, and tubs. ("Enamelled" and "enamelling" are the preferred spellings in British English, while "enameled" and "enameling" are preferred in American English.)
From - http://en.wikipedia.org/wiki/Vitreous_enamel
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