DELAMINATIONWhat is it?“Delamination is defined as a discontinuity of the surface concrete which is substantially separated but not completely detached from concrete below or above it.” (OSIM, 2008). Delamination is often identified by the hollow sound by tapping or chain dragging of concrete surface.How it happens?The corrosion of reinforcement and subsequent cracking of the cover can cause delamination. When the rebar have small spacing, the cracking extends in the plane of the reinforcement parallel to the exterior surface of the concrete.6- SPALLINGWhat is it?Spalling can be considered an extended delamination. In fact, when the delamination continues, the concrete fragments detach from a larger concrete mass.How it happens?If delamination is not repaired on time, the progress of damages as a result of external loads, corrosion, and freezing and thawing can break off the delaminated pieces.