Fiber cement building materials with low density additives
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United States of America Patent
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-
Jun 3, 2003
Grant Date -
Dec 6, 2001
app pub date -
Mar 9, 2001
filing date -
Mar 14, 2000
priority date (Note) -
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Abstract
This invention relates to a formulation with the addition of low density additives of volcanic ash, hollow ceramic microspheres or a combination of microspheres and volcanic ash or other low density additives into cementitious cellulose fiber reinforced building materials. This formulation is advantageously lightweight or low density compared as compared to current fiber cement products without the increased moisture expansion and freeze-thaw degradation usually associated with the addition of lightweight inorganic materials to fiber cement mixes. The low density additives also give the material improved thermal dimensional stability.
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