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| | Dream Green Homes: Lightweight Concrete |
 | | Lightweight concrete, weighing from 35 to 115 pound per cubic foot, has been used in the United States for more than 50 years. |
 | | Lightweight concrete may be made by using lightweight aggregates, or by the use of foaming agents, such as aluminum powder, which generates gas while the concrete is still plastic. |
 | | Lightweight aggregate can also be produced by heating clay, shale, slate, diatomaceous shale, perlite, obsidian, and vermiculite. |
| www.dreamgreenhomes.com /materials/lwconcrete/description.htm (561 words) |
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