- Steelworld Research Team 32 January 2020 STEELWORLD Infrastructure boom to support rebar demand in India R einforcement steel bar (rebar) is a steel bar or mesh of steelwires used in reinforced concrete and masonary structures to strengthen and hold the concrete in tension. The surface of rebar is often patterned to improve the quality of the bond with the concrete. Reinforcing bars in masonry construction have been used since at least the 15th century (2,500 meters of rebar was used). During the 18th century, rebar was used to form the carcass of the leaning tower of Nevyanskin, Russia, built on the orders of the industrialist AkinfiyDemidov. The cast iron used for the rebar was of high quality, and there is no corrosion on the bars 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. However, it was not until the mid-19th century that rebar displayed its greatest strengths with the embedding of steel bars into concrete, thus producing modern reinforced concrete. The need Rebar's surface is often "deformed" with ribs, lugs or indentations to promote a better bond with the concrete and reduce the risk of slippage. The most common type of rebar is carbon steel, typically consisting of hot-rolled round bars with deformation patterns. Other readily available types include stainless steel, and composite bars made of glass fibre, carbon fibre or basalt fibre. The steel reinforcing bars may also be coated in an epoxy resin designed to resist the effects of corrosion mostly in saltwater environments, but also land based constructions. Bamboo has been shown to be a viable alternative to reinforcing steel in concrete construction. These alternate types tend to be more expensive or may have lesser mechanical properties and are thus more often used in specialty construction where their physical characteristics fulfil a specific performance requirement that carbon steel does not provide. Steel and concrete have similar coefficients of thermal expansion, so a concrete structural member reinforced with steel will experience minimal differential stress as the temperature changes. Rebar is required to compensate for the fact that whilst concrete is strong in compression, it is relatively In-Focus
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Infrastructure boom to support rebar demand in India Rsteelworld.com/newsletter/2020/jan20/In-Focus...coated rebar. Glass-Fiber-Reinforced-Polymer (GFRP) is made up of carbon fibre.
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- SteelworldResearch Team
32 January 2020STEELWORLD
Infrastructure boom to supportrebar demand in India