Chip Seals

Chip Seals are used to regain skid resistance of polished surfaces, prevent aggregate loss of oxidized surfaces, and fill minor cracks thereby eliminating extented pavement deterioration.  In addition, they are applied to gravel roads producing a maintenance-free hard top driving surface.

A low volume gravel road application technique called a double high float utilizes a conventional or polymer modified asphalt emulsion topped with local Class 2 aggregate. Alternate applications of emulsion and gravel are applied to a properly prepared base. The emulsion is designated as HF150 and the aggregate is designated as Class 2 as shown in the Aggregate Table.

Utilizing practical design procedures, a mix design can be produced to ensure compatibility of the aggregate and emulsion considering the anticipated traffic volumes. Double high float treatments utilizing a more durable aggregate for the riding surface may also be implemented. This application technique is also recommended for laneways and parking lots.

Moderate traffic levels require a higher quality of chip seal. This is accomplished by utilizing faster setting emulsions and harder, cleaner aggregates. Medium setting polymer modified emulsions enhance aggregate retention, set up durations, and enable traffic flow to continue with the least disruption.

High traffic levels require even greater attention to quality and durability when being sealed. On these pavements, a rapid setting emulsion is combined with single sized, washed aggregate, applied at predetermined application rates in both single and multiple layers. Smoother riding surfaces can be obtained through aggregate selection or by decreasing aggregate size with subsequent applications.

• Ontario
• Quebec
• Eastern Canada