There are two main loading conditions that concrete under goes. These are Compression and Tension. Concrete is very strong in compression and is very weak in Tension (pulling apart). Concrete has so little strength to resist tension it is assumed to have no strength in tension. When civil engineers design concrete structures they can determine where the tension and compression will be located. Steel is added to give the concrete tensile strength. For Example a concrete beam when loaded from the top will experience compression on top section of the beam. The top portion of the beam will push inwards creating compression while the bottom section will pull apart creating tension. (Imagine a smile shape). :) Therefore reinforcement will be needed in the tension area (bottom).
There are different forces on a materials such as Compression and Tension. Compression is pushing a material together. Tension is pulling a material apart. Concrete has good strength in Compression, but is weak in Tension. The steel reinforcement improves the resistance to tension of the concrete.
Concrete and Steel have very similar strain values (0.0035 and 0.003). They also have very similar temperature coefficients (10e-6 and 12e-6). This means that concrete reinforced with steel will bend and deform uniformly under load and temperature changes. Aluminum has a very different strain and temperature coefficient (0.016 and 22e-6). This means that while, yes, aluminum can be used for concrete reinforcement, the behaviour of an aluminum-reinforced concrete beam is much more difficult to predict. The strength of an aluminum-reinforced concrete beam would vary as the temperature changed and it would vary with the deflected shape. I would not recommend using aluminum to reinforce concrete.
Strength and cost.
In reinforced concrete construction, the modular ratio refers to the modulus of elasticity of concrete to that of steel. It is used in structural design calculations to determine distribution of stresses between concrete and steel in beams and columns.
Bridges are very complex structures that must be carefully engineered using long-lasting and strong materials. Some of the materials that are used for bridge building includes stones, cement, steel, wood, and composites.
Items used to reinforce concrete are wire mesh, rebar, and steel cables.
There are different forces on a materials such as Compression and Tension. Compression is pushing a material together. Tension is pulling a material apart. Concrete has good strength in Compression, but is weak in Tension. The steel reinforcement improves the resistance to tension of the concrete.
They do not expand equally, therefore the aluminium might crack the concrete on a hot day (or vice versa) due to this difference in expansion. i.e steel rods can be used to reinforce concrete because both materials expand equally.
Steel is used for its high tensile strength and the concrete is used for its high compression strength.
Because of the thermal compactablity of the steel the material is used in concrete
W9xW9 welded wire mesh consists of lengths of steel wire welded into 9 inch by 9 inch squares. This material is used to reinforce concrete panels and floors.
Steel and concrete.
The Sunshine Skyway Bridge is located in Florida and is built from concrete and steel. The longest span on the bridge is 1,200 feet.
Concrete reinforcing steel is commonly used in bridges, buildings, skyscrapers and road construction. Reinforcing concrete with steel significantly increases its strength in an economical and safe manner.
strength
Concrete and steel .
Concrete, stone and steel.