Low viscosity asphalt-rubber paving material
OwnerCharles H. McDonaldinventor
Life of this patent
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Abstract
The paving material comprises the reaction product formed by heating a mixture of paving grade asphalt and a non-oil resistent rubber to a temperature of about 350.degree. F to about 500.degree. F. The improvement provides for a relatively low viscosity paving material by admixing a diluent with the asphalt-rubber mixture prior to the reaction whereby the viscosity of the paving material is unexpectedly reduced to about one-half as compared to the viscosity of the reaction product having the diluent admixed after the formation thereof. Variations in the viscosity of the paving material are unexpectedly minimized by precuring the asphalt-rubber-diluent mixture prior to reaction thereof.
Claims12
In a method for surfacing and repairing broken pavement with an elastomeric paving material, said material comprised of reaction product formed by endothermically reacting a mixture of a paving grade asphalt and a non-oil resistant rubber, the improvement comprising the step of admixing at least one diluent selected from the group consisting of petroleum fractions distilled from crude oil at a temperature of from about 174.degree. to about 325.degree. C. with said asphalt and said rubber prior to forming said reaction product, said diluent being admixed in an amount of from about 1 to about 15 percent by weight of said asphalt-rubber mixture, whereby the viscosity of said reaction product is reduced to at least about one half as compared to the viscosity of said reaction product having said diluent admixed after the formation thereof.
An elastomeric paving material comprised of a reaction product of a paving grade asphalt, a non-oil resistant rubber, and an asphalt solvent;
- said material being prepared by mixing from about 2 to about 5 parts by weight of paving grade asphalt, about 1 part by weight of particulate non-oil resistant asphalt soluble rubber, and at least one diluent selected from the group consisting of petroleum fractions distilled from crude oil at a temperature of from about 174.degree. to about 325.degree. C., said diluent being admixed in an amount of from about 1 to about 15 percent by weight of the asphalt-rubber mixture;
- and heating said asphalt-rubber-diluent mixture to a temperature of from about 350.degree. to about 420.degree. F. to form a jellied reaction product, whereby the viscosity of said reaction product is reduced to at least about one half as compared to the viscosity of said reaction product having said diluent admixed after the formation thereof.
Dependencies are inferred from the claim text.