Why Concrete Needs Reinforcement?

[dexter]

Concrete's greatest weakness is its tensile strength, which can be less than 10% of its compressive strength. So, we often reinforce it to create a composite material strong against all types of stress. This video briefly touches on conventional rebar and prestressed/post-tensioned reinforcement.

 

[war&peace]

Well it is a very well known and well understood concept. There is nothing new. Concrete is a brittle material while metals tend to be ductile and have much higher toughness, resilience and can absorb high amount of energy before the yielding under stress and eventual failure. Furthermore the ductile failure is more gradual while the brittle material fails abruptly. It has to do with the modulus of elasticity, defined by the following relations

sigma = E x epsilon
​

where sigma is the stress in Pascals i.e. N/m^2, E the modulus of elasticity and basically the slope of the relation between stress and the strain (epsilon)..which basically means the percentage elongation or change under the load in Newtons and thus epsilon or strain is a unit less quantity i.e. a ratio of quantities with same physical dimensions.

epsilon = (change in length) / original length

​

 

[fanne]

steel reinforcement has facilitated highrise buildings.

 

[dexter]

Well it is a very well known and well understood concept. There is nothing new. Concrete is a brittle material while metals tend to be ductile and have much higher toughness, resilience and can absorb high amount of energy before the yielding under stress and eventual failure. Furthermore the ductile failure is more gradual while the brittle material fails abruptly. It has to do with the modulus of elasticity, defined by the following relations

sigma = E x epsilon
​

where sigma is the stress in Pascals i.e. N/m^2, E the modulus of elasticity and basically the slope of the relation between stress and the strain (epsilon)..which basically means the percentage elongation or change under the load in Newtons and thus epsilon or strain is a unit less quantity i.e. a ratio of quantities with same physical dimensions.

epsilon = (change in length) / original length

​

No need to go much complex, this video describes the phenomenon with much simplicity like concretre can bear compressive strength while steel can bear tensile strength thus combining them gives us Reinforced Concrete.

 

[RealNapster]

Concrete's greatest weakness is its tensile strength, which can be less than 10% of its compressive strength. So, we often reinforce it to create a composite material strong against all types of stress. This video briefly touches on conventional rebar and prestressed/post-tensioned reinforcement.

Q: what did steel said to concrete in his ear ?
Ans : bro. Dont take any tensions.

Because concrete is very weak in tension (though strong in compression). During designing process the tensile strength of concrete is not considered as its neglisible. So, we use reinforcement.

Now, why steel ? It have its on reasons.

 

[dexter]

Q: what did steel said to concrete in his ear ?
Ans : bro. Dont take any tensions.

Because concrete is very weak in tension (though strong in compression). During designing process the tensile strength of concrete is not considered as its neglisible. So, we use reinforcement.

Now, why steel ? It have its on reasons.

Because steel and concrete are made for eachother until the end of this world.

 

[RealNapster]

Because steel and concrete are made for eachother until the end of this world.

Yah. There love story is still better then twilight.

Same co-efficient of thermal expansion.
Easy availability of steel (to get close to his love )
And cost factor.