Methods and systems for modifying asphalts
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United States of America Patent
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May 20, 2008
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N/A
app pub date -
Jun 21, 2005
filing date -
Jun 22, 2004
priority date (Note) -
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Abstract
A method for modifying asphalt comprises blowing an oxygen-containing gas through a base asphalt at a high gas flow rate while simultaneously agitating the base asphalt at a high shear rate and at an elevated temperature for a period of time that is effective to substantially improve at least two paving properties of the base asphalt. In preferred embodiments, modified asphalts are produced having both substantially improved rutting resistance and substantially improved fatigue resistance as compared to the base asphalt.
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