2007-08-15 19:37:43 · 2 answers · asked by Vicious V 2 in Home & Garden ➔ Garden & Landscape
Pozzolans are primarily vitreous siliceous materials which react with calcium hydroxide to form calcium silicates; other cementitious materials may also be formed depending on the constituents of the pozzolan.
The first known pozzolan was pozzolana, a volcanic ash, for which the category of materials was named. The most commonly-used pozzolan today is fly ash, though silica fume, high reactivity metakaolin, ground granulated blast furnace slag and other materials are also used as pozzolans.
Initially, that wasn't too hard, but over time it sure got a lot harder!
2007-08-15 23:03:25 · answer #1 · answered by A Well Lit Garden 7 · 0⤊ 0⤋
It's a mineral derived from volcanic erruptions used to strengthen concrete because of its reaction with lime.
2007-08-15 22:13:07 · answer #2 · answered by reynwater 7 · 0⤊ 0⤋