Which defect is defined as a separation between the surface layer and the underlying concrete, potentially larger than blisters?

Which defect is defined as a separation between the surface layer and the underlying concrete, potentially larger than blisters?

• A. Delamination
• B. Cracking
• C. Spalling
• D. Scaling

Answer: (A)

Delamination describes the surface skin peeling away from the underlying concrete, which fits the idea of a separation between the surface layer and the material beneath and can be larger than a blister. This type of defect happens when the bond between the surface and the substrate is compromised—often from improper curing, moisture movement, or contamination—allowing a broader area to lift apart rather than just form small blisters. Cracking is a fracture in the concrete itself, spalling is the loss of surface material often from internal pressure or exposure, and scaling is a thin, flaky surface film from surface deterioration; none describe a layer-to-substrate separation as delamination does.

Delamination describes the surface skin peeling away from the underlying concrete, which fits the idea of a separation between the surface layer and the material beneath and can be larger than a blister. This type of defect happens when the bond between the surface and the substrate is compromised—often from improper curing, moisture movement, or contamination—allowing a broader area to lift apart rather than just form small blisters. Cracking is a fracture in the concrete itself, spalling is the loss of surface material often from internal pressure or exposure, and scaling is a thin, flaky surface film from surface deterioration; none describe a layer-to-substrate separation as delamination does.