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Check out the first two videos on concrete if you haven't seen them already:
What is Concrete? (   • What is Concrete?  )
Why Concrete Needs Reinforcement (   • Why Concrete Needs Reinforcement  )

While steel reinforcement solves one of concrete’s greatest limitations, it creates an entirely new problem: Corrosion of embedded steel rebar is the most common form of concrete deterioration. There are lots of ways to combat this problem, a few of which we discuss/demonstrate in this video, including fiber reinforced concrete, adequate protective cover, and fiber reinforced polymer bars.

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Tonic and Energy by Elexive is licensed under a Creative Commons Attribution License
Source:    • Elexive - Tonic and Energy [Creative Commons]