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rebar
Rebar (short for reinforcing bar), also known as reinforcing steel, reinforcement steel〔Merritt, Frederic S., M. Kent Loftin and Jonathan T. Ricketts, ''Standard Handbook for Civil Engineers, Fourth Edition'', McGraw-Hill Book Company, 1995, p. 8.17〕 and colloquially in Australia as reo, is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and hold the concrete in tension. Rebar's surface is often patterned to form a better bond with the concrete.
==History==
Originally, concrete structures were unreinforced. Rebar has been used in construction since at least the 15th century; for example, 2500 m of rebars were used in the Château de Vincennes.
More recently, during the 18th century, rebar was used to form the carcass of the Leaning Tower of Nevyansk in Russia, built on the orders of the industrialist Akinfiy Demidov. The cast iron used for the rebar was of high quality, and there is no corrosion on them to this day. The carcass of the tower was connected to its cast iron tented roof, crowned with one of the first known lightning rods.〔(The office of the first Russian oligarch ) 〕 More recently these techniques have been refined by embedding the steel bars in the concrete, and by the introduction of deformed bars to improve bonding, thus producing modern reinforced concrete.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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