Concrete

The mixture of Portland {cement}, sand, gravel, and water. Used to make garage and basement floors, sidewalks, patios, foundation walls, etc. It is commonly reinforced with steel rods (rebar) or wire screening (mesh).
Concrete block A hollow concrete brick  often 8 8 16 in size.
Concrete board Apanel made out of concrete and fiberglass usually used as a tile backing material.
Concrete plain Concrete either without reinforcement, or reinforced only for shrinkage or temperature changes.

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