Method for deicing highways using starch-containing compositions

Details Method for deicing highways using starch-containing compositions Method for deicing highways using starch-containing compositions

1997-04-08

1998-12-15

Bell, Janyce

Coating processes

Coating pavement or the earth

252 70, 106 13, 427384, B05D 510

Patent

active

058493565

ABSTRACT:
The invention hereof is a new highway deicing additive and a method for deicing asphalt highways. It has been discovered that a small amount of starch added to the salt/water sprayed on highways provides the unexpected property of retaining salt particles in the top portion of the "voids" in the asphalt roads for a period of 2 to 4 hours. The starch can be incorporated into water by mixing; biocides can be added if the starch/water mixture is to be stored more than 2 days. Salt is added to the water/starch mixture prior to deposition on the road. The new treatment works by increasing the viscosity of the aqueous fluid sprayed on the highway to form a water gel structure on the road providing a "platform" for the salt particles in the top portion of the asphalt. The new additive also reduces the need and cost of "follow-up" salt treatments.
The additive and method are particularly useful for the new type of asphalt being used on highways in Europe which has a super-porous structure when laid as a road-bed.

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U.S. Army Corps of Engineers, Anti-Icing Technology, Summaries of State Experiences, FHWA Test and Evaluation Project No. 28, Aug. 1995.
Anti-Icing/Roadway Weather Information Systems, Lead State Team for SHRP Technology Implementation, Sep. 18-19, 1996.

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