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April 25 - May 1, 2016

What causes concrete “dusting,” and is there any way to prevent or remove it?


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From web stokes of DMA on May 2, 2016:
Dusting can be the result of improper curing or placement, or it can be caused by the natural wear of the concrete surface. Even in a hard trowel finish, the cream will wear and expose subsurface capillaries that contain free lime (CaO) that presents as dust. The best solution for dusting is either a coating (with proper prep), or a densifier (with or without polish) depending on the use of the floor. Coatings will prevent further wear of the surface and exposure of the capillaries, where the densifier should react with the CaO to form CSH and prevent further dusting.

From John Fauth of ChemMasters, Inc. on April 29, 2016:
Dusting can be the result of poor curing practices.

From Roy Harvey of Versa Flex on April 27, 2016:
Dusting is caused by traffic on a weak concrete surface. Densifiers will reduce or prevent dusting.

From timothy barrett of title president on April 26, 2016:
It can be removed by shotblasting or scarification. One of the causes is freezing.

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