Environment & Energy

those things use a ginormous amount of concrete.

this is a great way to use coal waste. fly ash shd b used for a lot of things. they do make landscape bricks w it. they’re kinda grey, so they dont use it for much else. but it’s not that hard to add color. a little iron, and u shd b able to make it look like regular bricks. but u cd make all kinds of colors.