Lightweight foamed glass aggregate
View Patent ↗A lightweight aggregate for use in concrete exhibiting a high weight to strength ratio comprising a mixture of hydrated cement and a low sodium closed-cell foamed glass comprised of between 51 and 65 weight percent silica, between 8 and 14 weight percent alumina, between 2 and 5 weight percent soda, between 18 and 26 weight percent calcia, between 2 and 5 weight percent iron oxide, and up to 8 percent lithium oxide.
1. A concrete material comprising a mixture of hydrated cement and a low sodium closed-cell foamed glass wherein the sodium oxide content of said glass is 5 weight percent or less.
2. The concrete material of claim 1 wherein said mixture additionally contains at least one pozzolan.
3. The concrete material of claim 1 wherein said hydrated cement is aerated.
4. The concrete material of claim 1 wherein said closed-cell foamed glass contains lithium oxide.
5. The concrete material of claim 1 wherein said closed-cell foamed glass has a hardened shell formed by a flash firing process.
6. The concrete material of claim 1 wherein said closed-cell foamed glass contains lithium oxide in an amount between about 0.1 to 8 weight percent.
7. A concrete material comprising a mixture of hydrated cement and a low sodium closed-cell foamed glass comprised of between 51 and 65 weight percent silica, between 8 and 14 weight percent alumina, between 2 and 5 weight percent sodium oxide, between 18 and 26 weight percent calcia, between 2 and 5 weight percent iron oxide, and up to 8 percent lithium oxide.