The Right Way to Restore Finishability

The Right Way to Restore Finishability

Evaporation retarders were developed to reduce plastic shrinkage cracking, flaking, crusting, and dusting by forming a film that allows hydration to increase surface hardness and strength. Used properly, they also prevent the crazing seen in the bottom part of this photo.

The Right Way to Restore Finishability

Dusting of hardened concrete can be a result of not using evaporation retarder in dry and windy conditions.

The Right Way to Restore Finishability

On the other hand, too much evaporation retarder or working the product into dry concrete causes popouts.

The Right Way to Restore Finishability

Scaling is another common failure caused by evaporation retarders finished into the surface.

The Right Way to Restore Finishability

Improper use of evaporation retarders also lowers surface resistance to freeze-thaw cycles and deicing salts.

The Right Way to Restore Finishability

Concrete slab surfaces after 100 freeze-thaw cycles with evaporation retarder (this photo) and finishing aid (next photo).

The Right Way to Restore Finishability

Concrete slab surfaces after 100 freeze-thaw cycles with evaporation retarder (previous photo) and finishing aid (this photo).

The Right Way to Restore Finishability

Pull-off tests show more aggregate pulled out in the sample finished with evaporation retarder (this photo) than with a finishing aid (next photo).

The Right Way to Restore Finishability

Pull-off tests show more aggregate pulled out in the sample finished with evaporation retarder (previous photo) than with a finishing aid (this photo).

The Right Way to Restore Finishability

Return overly dry surfaces to a finishable state with a finishing aid, not an evaporation retarder. They’re two different products meant for two different applications. Finishing aids are formulated specifically to be sprayed onto dried concrete to create a creamy surface, accelerate the finishing process, and increase the degree of hydration to create a stronger and more durable surface.

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