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US 4,296,207 AGranted
Antifreeze protection of roads
AssigneeMannesmann Aktiengesellschaft
InventorWerner Siegmund
Life of this patent
Estimating the term…
Abstract
Residue from dressing bauxite is mixed with NaCl and ground; polyurethane foam is ground and mixed with CaCl.sub.2 ; a silicon organic compound and quartz powder is added to one or both of the ground mixtures; the grains are embedded in bituminous material or asphalt to be used for making a surface road, being protected against frost by these salts. Specific examples and method steps are described.
Claims15
An admixture for the surface layer of a road, comprising:
- a first and primary component thereof, being a granular, inorganic material, grains thereof being porous, in which the pore volume is at least 30 degrees, the pores containing a first antifreeze substance;
- a second and secondary component, being a granular, organic materal, the grains thereof also being porous and having a pore volume in excess of 30 degrees, the pores containing a second antifreeze substance;
- at least one of the components being made hydrophobic through the addition of a silicon-organic compound;
- and
- the grains of said first and second component being embedded in a bituminous, or asphalt, binder.
2 more elements
A method of making an admixture for use as the surface layer of a road, comprising the steps of
- (1) mixing a porous inorganic substance, having a pore volume of at least 30 degrees, with water, sodium chloride, and a silicon-organic compound;
- (2) mixing a porous, organic substance, having a pore volume of at least 30 degrees, with water, calcium chloride, and a silicon-organic compound;
- (3) separately drying the substances resulting from the mixing steps;
- (4) grinding the dried substances containing the sodium chloride to a particle size below 0.1 mm;
- (5) grinding the other substance to a particle size below 1.0 mm;
- and
- (6) said ground substances being mixed with road surface material, the material serving as a binder.
4 more elements
Dependencies are inferred from the claim text.