Steel, concrete, two of the most often used
materials in construction. I’m Robert Markey and I’ve been doing construction for about
30 years and we are going to talk about the difference between steel and concrete. The
difference is actually pretty simple. Concrete is incredibly strong in compression. I can
push really hard on this and it is not going to move. Steel has no strength in compression.
I can push really hard on this and it bends. Expansion I can pull and it breaks. In expansion,
I can pull really hard and there’s no way I’m going to break it. So if you want to put
something on something like a foundation, a base, use concrete because it is not going
to move, it is really strong. If you are going to hang something you are going to use steel.
Now the main issue is what do you use for a horizontal because when you have a horizontal
piece you have compression at the top and you are pulling it apart at the bottom so
a very strong steel high beam would work if you can combine the steel and the concrete
you get both a compression and a resistance to breaking on the expansion. You will do
that in peers also so they won’t move back and forth the steel will combine with the
concrete to make this strong both in expansion and in compression. When you combine steel
and concrete as a word pharo-cement which is just a very very strong material which
combines the strength of both to get away from the weaknesses of both. I’m Robert Markey
and we’ve been talking about steel and concrete.