Surface defects on slabs may include cracks, low wear resistance, dusting, scaling, popouts, blisters, delaminations, spalling, discoloration, low spots and curling, among others. Sometimes these imperfections are of little consequence to the performance of the slab and may present only an aesthetic challenge. In other cases the defects are serious and may compromise the serviceability of the slab. DRP has extensive experience in troubleshooting surface defects on slabs. By working closely with our clients we are able to help them understand the principal cause(s) of the defects and develop rational measures to remediate them.
Reflected light photomicrograph of polished surface of core from delaminated slab. The green bar measures the depth to the delamination surface (red arrows) and the yellow bar measures the thickness of the densified surface layer.
Photograph showing trowel chatter on the finished surface of a core.
Photograph showing soft surface where water was finished into the slab.
Reflected light photomicrograph of polished surface from core where delamination occurred within the densified surface layer.
Photograph showing exposed aggregate and crazing on finished surface.
Reflected light photomicrograph of polished from core where blistering occurred. Red arrows highlight microcracks below blister and blue arrows indicate water void.