Commercial Concrete Repair: From Surface Spalling to Structural Cracks

Commercial concrete requires different repair approaches depending on failure type and cause. Here's a guide for property managers.

Commercial Property Services

Concrete failure comes in many forms: surface spalling, delamination, cracking, corrosion-induced damage, and structural deterioration. Identifying the failure type correctly is the first step to an effective, lasting repair.

Surface spalling — the loss of the concrete surface layer — is typically caused by freeze-thaw cycling with salt contamination. Water enters the concrete, freezes, expands, and pops off the surface. Treatment requires removing loose material and applying appropriate repair mortar.

Industry Best Practices

Through cracks may be structural or non-structural. Non-structural cracks (from drying shrinkage or minor settlement) can be injected with epoxy or filled with flexible sealant. Structural cracks require engineering assessment before treatment.

Delamination — separation of a surface layer from the underlying concrete — is detected by hollow sound when tapped. Delaminated areas must be removed and repaired; attempting to rebond is typically unsuccessful.

How D&D Commercial Services Can Help

Corrosion-induced damage is the most serious form. Salt-contaminated water reaches reinforcing steel, initiates corrosion, expands, and fractures the concrete (spalling). Treatment requires removal of all chloride-contaminated concrete, corrosion treatment of exposed rebar, and replacement with properly designed repair mortar.

Surface preparation is the determinant of repair longevity. Saw-cutting repair perimeters, removing all loose material to sound substrate, and sandblasting creates the mechanical bond that makes repairs last.

Post-repair surface treatment with penetrating sealers reduces future moisture and chloride infiltration, extending repair life and protecting surrounding areas from the same deterioration process.

Devon Moore, Operations Lead Co-Founder & Operations Lead — D&D Commercial Services

Devon Moore is the co-founder and Operations Lead at D&D Commercial Services, delivering professional commercial property maintenance across Waterloo Region.