New patch sounds hollow or separates along its perimeter.
Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.
New patch sounds hollow or separates along its perimeter.
Test substrate soundness and inspect profile, cleanliness, moisture and cure history.
Laitance, smooth surface, incompatible material or curing errors can weaken bond.
Remove failed material and specify preparation and repair compatible with depth and exposure.
Achieve the approved profile, condition substrate and follow bonding and curing procedure.
Use sounding or bond tests as specified before accepting the repair.
Do not bond over dust, weak laitance or old failed patch material.
References inform the topic; they do not endorse a specific product for this project.