Sandcrete is a weak mortar-like building material with little compressive strength and zero tensile strength. I used it in Hollywood in a breakaway wall effect.
Concrete has more cement which is the glue that binds the rock aggregate and sand into concrete. It has lots more compressive strength but still not a lot of tensile strength.
So to make a strong column, vertical steel rods in compression are kept from blowing out with horizontal tension bands. In a horizontal beam or slab, the top chords of steel are in compression, but the bottom ones are being pulled in are in tension. The steel is ductile, which means it can flex with the concrete and it adds that critical tensile strength allowing us to create mighty bridges.
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