Here’s another way to reduce both the carbon footprint and the cost of concrete. Rotobase is a naturally mined pozzolan of very finely ground expanded silicate. The tiny size of the grains allows mixes with up to 25% cement replacement to react quickly with free lime in the cement to provide strengths equivalent to all-cement mixes. And since it binds with lime, it helps to eliminate efflorescence. Similar to Rhine Trass Powder, it is lighter in color so it can be used in colored concrete mixes. For more information, visit www.rotec-nature.de.