Chip seals are a cost-effective pavement maintenance application. When designed and constructed properly, they usually perform very well on highways. Chip seals increase macro-texture, fix distressed surfaces, and prolong the lives of structurally sound pavements. However, in certain situations chip seals have had some limitations, including:
- limited life or premature failure if not properly designed or constructed
- potential windshield damage from loose chips
- increased tire noise
- prolonged traffic disruption during construction and curing
With proper techniques, these problems can be avoided. Some special techniques and the solutions they provide include:
- double or triple chip seals - increased service life
- modified binders - shorter closure time, better chip retention, increased service life
- precoated aggregate - shorter closure time, better chip retention, blacker color
- sand seals - less raveling and shelling
- sandwich seals - longer service life, seals flushed pavements, improved macro-texture, appropriate for higher traffic volume roads
- cape seals - fewer loose aggregates, less tire noise, longer service life, appropriate for higher traffic volume roads
Sealing for Success
In any paving project, proper material selection, design, and construction practices, including adequate traffic control, are an important part of the success. Contact your local SemMaterials representative for more information on ways to make chip seals, or other surface treatments, meet your needs.