What is Scaling?
Scaling in concrete structures refers to the localized flaking or peeling away of portions of concrete or mortar near the surface. This phenomenon occurs when the surface layers of concrete lack density and homogeneity, leading to the exposure and dislodgement of coarse aggregate particles.
Scaling can result from various forms of deterioration, including Alkali-Aggregate Reaction (AAR), External Sulphate Attack (ESA), and freeze-thaw action. Poor finishing practices during concrete placement may also contribute to scaling.
How does Scaling damage concrete structures?
Scaling damages concrete structures by compromising the integrity of the surface layers and exposing underlying components to environmental factors. As portions of concrete or mortar peel away, coarse aggregate particles become exposed and eventually dislodged, leading to structural weaknesses.
This deterioration increases the susceptibility of the concrete to moisture ingress, chemical exposure, and freeze-thaw cycles, ultimately compromising its durability and longevity.
Preventive measures, such as proper finishing practices and addressing underlying deterioration mechanisms, are essential to mitigate scaling and preserve the structural integrity of concrete.
What causes Scaling?
High porosity.
Inadequate air entrainment.
Poor finishing.
Contact with de-icing salts.
How can I identify Scaling in concrete structures?
Visual survey | Non-destructive testing | Destructive testing |