why we use iron as reinforcement with concrete in buildings roof or even in concrete wall?

Answer 1

Steel rods (rebar or reinforcing bars) are used in concrete structures to add strength. Concrete can withstand great force in compression but not in tension or bending. If the concrete cracks, the rebar will hold the structure in place. If the rebar is pre-tensioned it can help prevent cracks.

Answer 2

First off, we don't use iron, we use steel.

Concrete is extremely strong in compression but weak and brittle under tension. By inserting steel rebar (short for reinforcing bar) into the concrete as it's poured, you can pass the tensile stresses from the concrete into the steel.

By stretching the steel under tension while the concrete sets, the steel will act like a stretched rubber band and bias the concrete towards compression, thereby strengthening it. This is called prestressed concrete. Alternately, the concrete can be cast with a hole through it, and a threaded bar bolted on to add tension; this is called poststressed concrete.

Answer 3

Well of course as reinforcement in cement structures giving it flexability and strength in all types of weather and temperatures, concrete tends to suffer deep stress fractures in extream heat or cold as it holds in the previous temperature of yesterday. Ever feel a concrete wall on a hot day? it's cooler and that's' from last night or yesterdays low temp. Without the steel bar inside, the structure would break and fall apart.

Answer 4

this makes reinforced concrete much stronger than reqular concrete also the mix is different it takes longer to set and the bars are made of steel and some external bars are galvanized this allows for support while the concrete is setting it also alows as a shock absorber and distributs the weight of the building through the steel bars not the concrete.

Answer 5

coz the concrete is weak toward tensive forces, we use steel , a material which is good in tension, to fill this weakness.
need to say that the concrete has a high durability in compressive forces.

Answer 6

modulus of elasticity of steel is 20 times greater than that of concrete.i.e tensile strength of steel is greater than that of concrete. reinforcement of concrete causes matrix formation of steel and concrete which resists bending moment i.e sagging and provides greater strength.

Answer 7

Because pure concrete doesn´t resist any traction forces.To absorb these you put iron bars in

Answer 8

as with all of the climate of a widespread commercial development, the roof is equipped to conventional industry standards and there is not plenty thought that is going into it previous the criteria.

Answer 9

Strength, cost and availability.

Answer 10

Strength and stability