Whitetopping, or more correctly concrete overlay, is the placing of concrete over existing asphalt pavement, concrete pavement or composite pavement. These overlays are designed to be either bonded or unbonded.
Bonded overlays generally add structural capacity and/or eliminate surface distresses and are generally 2-5” thick. Bonded together, the new pavement performs as one monolithic pavement. Unbonded overlays are designed to restore structural capacity to existing pavements that show significant deterioration. These overlays are thicker (4 – 11”) and in this case the existing pavement acts a stable base for the thicker new pavement.
Rehabilitating a deteriorated pavement with concrete presents many advantages:
Life Cycle Costs – Whitetopped pavements last longer, offer excellent serviceability, and require far less maintenance than competitive products.
Safety – Concrete pavements do not rut and the light surface provides a safer surface at nighttime. Concrete pavements, roads and parking areas, have fewer pothole problems, alleviating owner concerns.
- Concrete pavements are environmentally friendly, creating light, safe surfaces that stay as much as 10 degrees cooler than asphalt surfaces.