Information AboutRebar |
| CATEGORIES ABOUT REBAR | |
| building materials | |
| concrete | |
| construction | |
| metalworking | |
| steel | |
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to lend it strength.]] Rebar, a Portmanteau for ''reinforcing bar'' or ''reinforcement bar'', is common Steel bar, an important component of Reinforced Concrete and reinforced Masonry structures. It is usually formed from Carbon Steel , and is given ridges for better Friction al adhesion to the concrete. It can also be described as '''reinforcement''' or '''reinforcing steel'''. In Australia it is Colloquially known as '''reo'''. USE IN CONCRETE AND MASONRY Concrete is a Material that is very strong in Compression , but virtually without strength in Tension . To compensate for this imbalance in concrete's behavior, rebar is cast into it to carry the tensile Load s. Masonry structures and the Mortar holding them together have similar properties to concrete and also have a limited ability to carry tensile loads. Some standard masonry units like blocks and Brick s are made with strategically placed voids to accommodate rebar, which is then secured in place with Grout . This combination is known as reinforced masonry. While any material with sufficient tensile strength could conceivably be used to reinforce concrete, steel and concrete have similar as a result of differential expansions of the two interconnected materials caused by temperature changes. PHYSICAL CHARACTERISTICS Steel has an expansion coefficient nearly equal to that of modern concrete. If this weren't so, it would be useless for reinforcing concrete. GFRP Bar Transverse Coefficient of Thermal Expansion Effects on Concrete Cover Although rebar has ridges that bind it Mechanically to the concrete with friction, it can still be pulled out of the concrete under high Stresses , an occurrence that often precedes a larger-scale Collapse of the Structure . To prevent such a failure, rebar is either deeply embedded into adjacent structural members, or bent and hooked at the ends to lock it around the concrete and other rebar. This first approach increases the friction locking the bar into place while the second makes use of the high compressive strength of concrete. Common rebar is made of unfinished steel, making it susceptible to Rust ing. As rust takes up greater volume than the iron or steel from which it was formed, it causes severe internal pressure on the surrounding concrete, leading to cracking, Spalling , and ultimately, Structural Failure . This is a particular problem where the concrete is exposed to salt water, as in bridges built in areas where salt is applied to roadways in winter, or in marine applications. Epoxy -coated rebar or Stainless Steel rebar may be employed in these situations at greater initial expense, but significantly lower expense over the service life of the project. Fiber-reinforced Polymer rebar is now also being used in high-corrosion environments. |
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