The chips in the second application of aggregate are smaller than those used in the first application. A double chip seal repeats the procedure using lower emulsion and aggregate application rates. In a single chip seal, an asphalt emulsion is sprayed on the pavement with a distributor, then immediately covered by a single layer of uniformly sized chips from a chip spreader. Long-term pavement performance studies show that chip seals are one of the most cost-effective methods of pavement preservation. Reduced pushing and shoving in the new asphalt surface.Ĭhip seals are surface treatments designed to prolong and protect the life of a pavement.The sprayed emulsion is allowed to break before the new surface is applied. The tack coat is sprayed at a uniform rate from an asphalt distributor. Tack coats significantly increase the strength and fatigue life of pavements at a low cost.Ī good tack coat provides a uniform thin, tacky, adhesive film without running off the road or causing slippage between the old and new pavement surface.
Today they are used for a wide variety of road construction and pavement preservation projects.Ī tack or bond coat is a spray application of asphalt emulsion that provides a bond between the existing pavement and a new overlay. Recycling with asphalt emulsions is an environmentally attractive way to reduce costs and reuse paving materials.Īsphalt emulsions were created in the early 1900s, mainly for dust control and other spray applications. They can be used for preventive and corrective maintenance on both asphalt and concrete pavements, stabilizing and reclaiming bases, building structural pavements and recycling worn out pavements. Asphalt emulsions can be used for almost any type of pavement application.
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