I dont know what they are made out of. do anybody
Wood, brick, concrete, insulation, metal...
Concrete or asphalt depending on the track.
Some concrete is made with man-made poly-fibers for strength.
yes. it has to at some point because there is only so much new concrete that can be made.
Houses in Ecuador are mostly made of cement or concrete. Some houses there are made of mud. if you ever go there you'll mostly see houses made of concrete. :D
cement concrete mortar bricks
Concrete- I remember when concrete nails were made of a forged tungsten steel.
Concrete
it was made when schools started so kids can have some fun
with bricks, mortar, concrete and other stuff....
Concrete is primarily made from non-ionic compounds such as water, sand, cement, and aggregate. However, some additives and reinforcement materials used in concrete mixtures may contain ionic compounds.
of concrete and paint and some weird chalky stuff