True or False: Concrete can be made by mixing powdered limestone, sand.
True or False: Concrete can be made by mixing powdered limestone, sand, gravel and water? Interesting use of concrete for construction (source: seier+seier) Concrete is the most often used construction material of the modern world. It is simple and economic to make and if the Egyptians had known the secret they could have made it 4000 years ago ...