Common Concreting Problems: Dusting of Concrete
is the formation of powder or
chalk at the surface of a concrete slab, usually
on floors. It powders under any kind of traffic and it can be easily
with a nail or even by sweeping.
A concrete floor dusts under traffic because the wearing surface is
are at least five identifiable causes of dusting:
dioxide from open unvented heaters, gasoline engines, ready mix
floating and/or troweling especially when condensation from warm
humid air forms on cold concrete.
or improper curing.
amounts of clay or silt in the concrete.
protection of freshly placed concrete from rain, snow or drying
low-slump concrete (4-inch max.)
not perform any finishing operations with bleed water present on the
placement directly on poly or non-absorptive sub-grades.
proper curing methods to retain moisture in concrete for the first 3-7
building for ventilation during production.
shotblast or use a high pressure washer to remove the surface
a commercially available chemical floor hardener, such as sodium
silicate, metallic zinc, or magnesium fluosilicate to thoroughly dried
concrete. If some dusting persists, coat with latex, epoxy sealers or