Pop-out A pop-out is a small cone-shaped fragment of concrete that breaks away from the surface, leaving a shallow hole. It is often associated with expanding aggregate particles or trapped moisture.
Pop-outs generally occur as isolated defects rather than widespread deterioration. While they seldom affect the structural performance of the slab, they can expose the surface to additional moisture and weathering. Identifying the underlying cause helps prevent recurring damage.
Frequently Asked Questions About Pop-out
What is a concrete pop-out?
A small cone-shaped fragment that breaks away from the surface, leaving a shallow conical hole.
What causes pop-outs?
An unsound or expansive aggregate particle near the surface absorbing moisture and expanding, or trapped moisture freezing beneath the surface.
Are pop-outs structurally significant?
Rarely. They are usually isolated and cosmetic, though they expose the surface to further moisture and weathering.
Can they be prevented?
Largely through aggregate quality control, since the cause is usually a defective particle in the mix.