Cracking and Seating Concrete
Prevention of Cracking in Road Surfaces and Pavements
Cracking and Seating is a practical and economical method of preventing reflective cracking in asphalt overlays on concrete roads. Crack and Seat is one of the most popular carriageway repair systems in the UK and Ireland.
The Crack and Seat process can be used where the existing concrete slab is a minimum of 100mm thick and of Pavement Quality Strength.
Cracking and Seating is also suitable for reinforced concrete.
What is Reflective Cracking?
Reflective cracking is caused by movement or faults in the concrete slab construction beneath reflecting into the asphalt overlay. Causes include voids in the sub-base, thermal expansion/contraction, rocking road slabs or overload of the rigid pavement. Cracking and Seating helps alleviate these problems
How does Crack and Seat work?
The concrete road slabs are cracked and seated back onto the sub-base. These new cracks then accommodate some of the thermal expansion/contraction thereby significantly reducing future reflective cracking.
- Existing overlay is removed
- Multiple hairline 45° fractures are induced which converts a rigid concrete road into a semi-flexible road base
- Overlay is then applied – a minimum of 30/40mm for light to moderately trafficked roads, and 60/70mm for busier roads and industrial estates
- Minimal disruption (no need for road closure)
- Cost-effective (reduces overlay thickness) – typically 80% cheaper than reconstruction
- Environmentally friendly – uses existing material
- Quick – up to 1,500m2 per day
- Finds voids and soft spots
- Reseats the concrete back down onto the sub-base
- Stops rocking and moving slabs
- Stops traffic vibration transmission to dwellings
- No adjustments of kerblines, footways, thresholds, height restraints, barriers or street furniture