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Published on 5/1/2018

Published by timharrison0064@gmail.com

Why Concrete Is So Much Stronger With Just a Little Bit of Rebar

Steel reinforcing gives concrete strength


 

 

Why Concrete Is So Much Stronger With Just a Little Bit of Rebar

 

A single steel bar gives concrete crucial new ways to cope with stress. 

Source : Popular Mechanics

By 

 

 

It's tempting to think of "strength" as a simple variable and that various materials all fall somewhere on a spectrum of strong to weak. The reality, of course, is much more complex. Different materials are strong in specific situations, but weak in others. For a really robust material, you have to start mixing and matching. Reinforced concrete is a perfect example. 

Concrete is great at putting up with stress in the form of compression. It can take a lot of squeezing abuse before it gives up. It's terrible at handling tensile stress though, and is not suited to fight against forces that would threaten to pull it apart. 

 

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This is a particular problem in construction, as Practical Engineering explains, because concrete in a building almost always experiences both kinds of stress. If you put weight on a concrete beam from above, its top will hold up heroically against the compression. Its underside, however, will experience severe tensile stress as the beam deforms. This creates a situation that engineers often refer to by the technical term "bad." 

Rebar helps to alleviate this issue because, unlike concrete, rebar is pretty great taking tensile stress. As a result, rebar inside of concrete both strengthens the resulting mixture by making its strength more all-around, and also decreases the speed at which failure occurs, giving engineers crucial time to spot a disaster before it happens. 

Watch Practical Engineering explain with some handy visual examples, take a moment to appreciate what's underneath you the next time you stand on a bridge: 

 

Source: 

Practical Engineering

 

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Tags: civil engineering concrete concrete strength engineer engineering mesh processed bar rebar reo steel reinforcing tensile strength


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