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Description A rebar, also known as reinforcing steel, reinforcement steel, rerod, a deformed bar, reo, or reo bar, is a common steel bar, and is commonly used as a tensioning device in reinforced concrete and reinforced masonry structures holding the concrete in compression. It is usually formed from carbon steel, and is given ridges for better mechanical anchoring into the concrete.HistoryRebars were known in construction well before the era of the modern reinforced concrete. Some 150 years before its invention rebars were used to form the carcass of the Leaning Tower of Nevyansk in Russia, built on the orders of the industrialist Akinfiy Demidov. The purpose of such construction is one of the many mysteries of the tower. The cast iron used for rebars was of very high quality, and there is no corrosion on them up to this day. The carcass of the tower was connected to its cast iron tented roof, crowned with the first lightning rod in the Western world. This lightning rod was grounded through the carcass, though it is not clear whether the effect was intentional.The office of the first Russian oligarch

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