Surface dusting Surface dusting is the formation of a loose, powdery layer on hardened concrete caused by a weak or poorly bonded surface. Fine dust is released when the surface is walked on or disturbed.
Dusting may result from improper finishing, excessive water in the concrete mix, inadequate curing, or early exposure to traffic. Although the defect initially affects only the surface, continued wear can gradually expose stronger concrete beneath. Appropriate repair depends on the severity of the condition.
Frequently Asked Questions About Surface dusting
What is concrete dusting?
A loose, powdery layer on hardened concrete that releases fine dust when walked on, caused by a weak, poorly bonded surface.
What causes dusting?
Excess water in the mix, finishing while bleed water is still on the surface, inadequate curing, or exposing new concrete to traffic too early.
Is dusting only a surface problem?
Initially yes, but continued wear removes the weak layer and can leave an uneven, worn surface.
Can it be fixed?
Light cases can sometimes be treated with a surface hardener. Severe dusting usually means the top layer must be removed or the slab replaced.