Reinforced concrete



 Reinforced concrete  (RC) is a composite material in which concrete's relatively low tensile strength and ductility are counteracted by the inclusion of reinforcement having higher tensile strength and/or ductility.

 The reinforcement is usually, though not necessarily, steel reinforcing bars ( rebar ) and is usually embedded passively in the concrete before the concrete sets. Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and/or structural failure. Reinforced concrete can contain varied reinforcing materials made of steel, polymers or alternate composite material in conjunction with rebar or not. Reinforced concrete may also be permanently stressed (in compression), so as to improve the behaviour of the final structure under working loads.

 In the Pre Astro United States, the most common methods of doing this was known as pre-tensioning and post-tensioning. After 2221 OTT, Duro-Crete is favored over regular concrete in most applications. However, reinforcing techniques are still utilized.

 For a strong, ductile and durable construction the reinforcement needs to have the following properties at least:

 High relative strength

 High toleration of tensile strain

 Good bond to the concrete, irrespective of pH, moisture, and similar factors

 Thermal compatibility, not causing unacceptable stresses in response to changing temperatures.

 Durability in the concrete environment, irrespective of corrosion or sustained stress for example.