Chips precoated with about one percent bitumen have been used successfully to minimize aggregate loss and to give the surface a black look. New methods also utilize cross linking styrene acrylic polymers which also provide quality water resistance. It reduces emissions of volatile organic compounds (VOCs) due to the lower solvent content.
This has been shown to help reduce aggregate loss and reduce cost of installation, but can increase stripping (separation of the binder from the aggregate).
Newer techniques use asphalt emulsion (a mixture of liquid asphalt, surfactant, and water) instead of asphalt.
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The introduction of polymer-modified bitumen and emulsion binder has increased chipseal's ability to prevent crack reflection and improve stone retention by improving the properties of the bitumen binder. A chip-seal-surfaced pavement can optionally be sealed with a top layer, which is referred to as a fog seal or enrichment. The aggregate is evenly distributed over the hot seal spray, then rolled into the bitumen using heavy rubber tired rollers creating a paved surface. A chipseal road in the United Kingdom Installation Ĭhipseals are constructed by evenly distributing a thin base of hot tar, bitumen or asphalt onto an existing pavement and then embedding finely graded aggregate into it.
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