Problem: 

Concrete surfaces which have been overlaid with any variety of asphalt layers will typically fail when the asphalt cracks above the location of the concrete joints.  

The reason for this is that asphalt cannot cope with the large amount of movement concentrated at the bay joints. Or, in the case of CRCP concrete, at the point above the cracked CRCP. 

Left unrepaired, this crack will become larger as traffic strikes water into the crevices until it eventually becomes large enough to be a pothole.  

These open joints are often associated with the ‘b-bump’ noise as vehicle tyres drop into and climb out of the degraded joint. 

Solution:  

Repairing these failures can be easily achieved using BBA HAPAS approved Jointmaster repairs. A typical repair would need to be deep enough to cut into the concrete surface underneath, typically 40mm or 50mm deep. The width would be determined by the width of the crack. Jointmaster is installed by cutting a recess necessary to remove all failed material. This could be 200mm or 300mm wide and sometimes larger. 

The recess is filled with the flexible Jointmaster compound. This flexible material accommodates future expansion and contraction whilst been strong enough to withstand wheel tracking from heavy goods vehicles. This is achieved through its high polymer content and the addition of crumb rubber for recovery.