This thin bonded concrete overlay – 3.5″ thick – was installed in over a milled asphalt surface. The joint spacing is 3′ x 3.5′. Installed in 1998 in Santa Monica, CA, today the concrete overlay is showing almost no wear and appears to be well on its way to a 30-50 year service life.
Repairing Pavement with Concrete Overlays
Concrete overlays offer fast, cost-effective, and versatile long term maintenance strategies for repair and maintenance of asphalt, concrete and composite pavements. Whether bonded or unbonded, concrete overlays are a durable rehabilitation tool extending the service life of a pavement and often increasing its load-carrying capacity.
Benefits of Using Concrete Overlays
• The installation of concrete overlays can be completed with minimal disruption to traffic. In fact, many concrete overlays can be opened to traffic in one day or less.
• Existing pavement can be left in place to serve as a part of the pavement section.
• Concrete overlays recycle most (if not all) of the existing pavement by repurposing it as a composite pavement layer.
• Maintenance costs for concrete overlays is very low relative to asphalt alternatives.
Vehicles traveling on concrete streets use less fuel because the rolling resistance is much lower than on other paving materials.
Enhanced light reflectivity and high albedo of concrete help reduce the heat island effect making concrete overlays a sustainable choice for pavement surfaces
Documents and Resources
- CNCA Integrated Paving Solutions Overview
- Thin Bonded Overlays in California & Nevada
- Guidelines – Concrete Pavement Restoration (CPR) – ACPA
- Guide for Partial Depth Repair of Concrete Pavements – NCPTC
- Thin Whitetopping – the Colorado Experience
- Summary of Concrete Overlays – NCPTC
- Guide to Concrete Overlays – NCPTC