Method for Chip Seal Coating

Abstract

This invention relates to a method for chip seal coating. Aggregate is pre-coated, at ambient temperature, with an emulsion. The pre-coated aggregate is then allowed to sit, preferably for at least 24 hours, to allow the mixture to break into the asphalt and soapy water components of the mixture. The aggregate is then air dried to a moisture content of between 1 percent minimum to a maximum of 15 percent. A paved surface may be manufactured by first apply hot asphalt binder to a properly prepared base. The pre-coated aggregate is then spread on top of the binder. Using a roller, the aggregate is embedded into the binder and compacted.

Description

PRIORITY[0001]Priority is claimed based on the Mar. 10, 2010 filing of provisional application No. 61 / 312,490, said application being specifically incorporated herewith in its entirety by reference for all purposes.BACKGROUND OF THE INVENTION[0002]This invention relates to a new asphalt based method for a chip seal coating of paved surfaces.[0003]Chip seal coating is commonly used in the repair or re-paving of existing paved surfaces, such as roads, airport runways and parking surfaces. During the application process, asphalt is heated to high temperatures to increase fluidity and adhesive properties. The heated asphalt, sometimes called an asphalt binder, is spread on the surface to be repaired or re-surfaced. Aggregate, consisting of various sized gravel particles are spread onto the asphalt binder and compressed into the binder. Prior to application, the aggregate must be pre-coated with asphalt. The process consists of heating the aggregate to high temperatures to remove dust an...

AI Technical Summary

Benefits of technology

The present invention relates to a new method for chip seal coating paved surfaces. The method involves pre-coating aggregate with a cationic asphalt emulsion and then applying the aggregate to a hot asphalt binder. The emulsion is mixed with the aggregate at ambient temperatures and the mixture is then heated to remove dust and moisture. The coated aggregate is then applied to the hot asphalt binder to form a chip seal coating. The invention provides a cleaner, cheaper, and more environmentally friendly method for coating the aggregate prior to insertion into the asphalt binder. The technical effects of the invention include improved adhesion between the binder and the pre-coated aggregate, reduced energy requirements, and a reduction in air pollution.

Problems solved by technology

The process of coating the aggregate is a very dusty and dirty process which requires substantial energy to heat the aggregate to proper temperatures.

If the aggregate has any dust or moisture on it, it will not bind to the asphalt binder and a poor result will be achieved.

Emulsion based paving does not have the strength and durability of a hot asphalt mix.

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