Method of foaming asphalt and products produced thereby
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United States of America Patent
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Apr 11, 1995
Grant Date -
N/A
app pub date -
Dec 16, 1992
filing date -
Dec 16, 1992
priority date (Note) -
Expired
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Abstract
A process of foaming asphalt comprises mixing sodium hydrogen carbonate with asphalt melted to a liquid state. The mixing yields carbon dioxide and water. The carbon dioxide gas foams the molten asphalt, and the foaming is enhanced by the boiling of the water. The rate of addition of the sodium hydrogen carbonate, and the temperature of the asphalt, are controlled in accordance with the desired specific gravity of the resultant foamed asphalt. The sodium hydrogen carbonate is added at a rate in a range of from about 2.0% by weight to about 6.0% by weight. The asphalt is melted at a temperature in a range from about 212.degree. F. to about 500.degree. F. The foamed asphalt is used, inter alia, by depositing the foamed asphalt on a substrate.
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Cited Art Landscape
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