Chipseal is a pavement rehabilitation method. It is cheaper than resurfacing an asphalt concrete or a Portland Cement Concrete pavement. It is performed by spraying of a thin base of asphalt onto an existing distressed pavement and then embedding finely graded aggregate into it. The aggregate is evenly distributed over the seal spray, then rolled into a smooth pavement surface. A chipseal surfaced pavement can optionally be sealed with a top layer which is referred to as a fog seal. The introduction of Polymer Modified asphalt binder has increased the chipseal's ability to prevent crack reflection and improve stone retention by improving the properties of the asphalt binder. Chipsealing is still in its infancy in the design methods and procedures, but in time we shall see design procedures and seal qualities continue to improve the resurfacing market. This article needs additional references or sources to facilitate its verification. ... As shown in this cross-section, many older roadways are smoothed by applying a thin layer of asphalt concrete to the existing portland cement concrete. ... Concrete being poured, raked and vibrated into place in residential construction in Toronto, Ontario, Canada. ...
It is a relatively new treatment method in the US, where it is typically used on lower capacity rural roads.
In Australia and New Zealand, chipsealing is referred to as a "sprayed seal" and is used on a larger percentage of roads both rural and urban.
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