Open-graded asphalt emulsion mixes
AssigneeChevron Research Company
InventorsPeter E. Graf, Judson E. Goodrich
Life of this patent
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Abstract
An open-graded emulsified asphalt paving mix is provided comprising a major portion of open-graded aggregate and a minor portion of cationic or anionic bituminous emulsion, the mix containing a minor portion of a polyelectrolyte having the opposite electric charge from that of the asphalt emulsifier which imparts excellent water resistance properties to pavement prepared from the mix. A method for producing the polyelectrolyte in situ is also provided.
Claims14
A paving composition comprising about 80 to 97% by weight of an open-graded aggregate and about 3 to 20% by weight of a cationic bituminous emulsion, said emulsion comprising about 40 to 75% by weight of asphalt, relative to the emulsion, 0.25 to 5.0% by weight relative to the emulsion of a cationic emulsifier, and water as a continuous phase of said emulsion to make up 100% by weight, said composition also containing about 0.01 to 3.0% by weight relative to the emulsion of an ionic polyelectrolyte having an ionic charge opposite to the emulsifier and comprising a salt of a polycarboxylic acid with an average molecular weight of from 1,000 to 10,000,000.
An ionically charged bituminous emulsion comprising from 40% to 75% by weight of asphalt, from 0.25 to 5.0% by weight of an ionically charged emulsifier, from 0.01 to 3.0% by weight of a synthetic polyelectrolyte precursor capable of being ionized into a polyelectrolyte having an ionic charge opposite to the ionic charge of said emulsifier, and water as a continuous phase to make up 100% by weight wherein the polyelectrolyte precursor is a salt of a polycarboxylic acid having a molecular weight of from 1,000 to 10,000,000.
Dependencies are inferred from the claim text.