Causes of Asphalt and Concrete Failures
- Water penetration
- Movement of the pavement
- Oxidation of the binder
- Inadequate drainage
- Upward reflection of underlying pavement
- Overloading of vehicles and continued traffic use
- Depth of pavement
A Maintenance Program will save you millions
- An Average Council has over $300m worth of assets in roads
- A systematic maintenance program is essential to extend the life of pavements
- Early maintenance intervention is vital
- Crack sealing is a key element in slowing down the deterioration process
- Extending the life of pavements can save you millions in the long term
Early intervention is vital in prolonging the life of pavements. Once you can see pavement failure on the surface, the rate of deterioration accelerates. Crack sealing is a key element in early intervention as it slows the deterioration process and can significantly add to the life of a pavement, maximizing your asphalt investment
Crack Sealing Applications
Used on smooth asphalt, reducing noise and improving skid resistance
Used on chip seal surfaces to ensure better penetration into cracks
Used on wide cracking to provide sufficient bondage on either side of the crack
The key qualities of crack sealing products are their flexibility, suitability to local weather conditions and that they are applied hot and are skid resistant. An effective crack sealant must have excellent torsional recovery within the crack, withstanding repeated expansion and contractions in the pavement. This flexibility must exist over a wide range of temperatures and have a high softening point to ensure that the product will not bleed in hot conditions.
Suitable plant with heating capabilities is necessary when undertaking crack sealing operations. As the sealant is classified as dangerous goods, appropriate signage and qualifications are required. Ideally the works should be done by an all-in-one unit that can work at a good pace as a mobile worksite, causing minimal traffic disruption.
You want asphalt repairs to be done with the right techniques to ensure they last as long as possible. However, even with the right techniques used, often patches fail as they have not bonded with the existing pavement and water and debris enter the surface. Crack sealing around the edge of new patches forms a waterproof bond and increases the longevity of the repairs.
When overlaying existing asphalt, it is vitally important to crack seal prior to works to prevent reflective cracking. If new asphalt is laid on failed pavement, the cracks in the base will undermine the new overlay and produce new cracks.more