Is Polished Concrete Porous?

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Polished concrete flooring is indeed porous

Concrete, by its nature, contains microscopic pores and capillaries that allow liquids and gases to penetrate its surface. Polishing concrete involves grinding down the surface to achieve a smooth, glossy finish. However, this process does not completely eliminate the material's porosity. While polishing can reduce the size and visibility of the pores, making the surface denser and more resistant to staining, it does not make the concrete entirely non porous.

Even polished concrete can absorb moisture and other liquids if left unsealed. This inherent porosity can lead to potential staining and damage if the surface is not properly maintained and sealed. Applying a sealer after polishing helps to fill the pores and provide a protective barrier against moisture, and wear, enhancing the durability and longevity of the polished concrete surface. Therefore, while polished concrete remains porous, appropriate sealing and maintenance can significantly mitigate its effects.

Does polished concrete flooring absorb water?

When polished concrete flooring is properly sealed, it does not absorb water. The sealing process involves applying a protective layer over the concrete, which fills the pores and creates a barrier against moisture penetration. This sealant effectively prevents water and other liquids from seeping into the surface, thereby protecting the concrete from potential staining, damage, and deterioration.

While polished concrete itself retains some porosity, the addition of a sealer ensures that the flooring becomes water resistant. Regular maintenance and reapplication of the sealant as needed will maintain this protective barrier, ensuring the longevity and durability of the polished concrete floor.

Polished concrete floor which has been grounded for industrial purposes.
Polished concrete floor which has been grounded for industrial purposes.

How a sealer combats porosity in polished concrete

A sealer is the final nail for preventing porosity in polished concrete by filling the microscopic pores and capillaries inherent in the concrete. When applied, the sealer penetrates the surface and creates a protective barrier that blocks moisture, oils, and other contaminants from seeping into the concrete. This barrier not only enhances the water resistance of the polished concrete but also protects it from potential staining and damage.

The sealing process involves coating the polished concrete with a sealant specifically designed for polished concrete, which can be either a penetrating sealer or a topical sealer. Penetrating sealers soak into the concrete, reacting chemically to form a water resistant shield from within. This type of sealer maintains the natural look of the concrete while providing deep protection. On the other hand, topical sealers form a protective layer on the surface, offering additional defense against abrasion and chemicals while enhancing the floor's appearance with a glossy finish.

By preventing moisture and other substances from entering the concrete, sealers significantly reduce the risk of damage and prolong the life of the flooring.

Grounded concrete floor in an office building.
Grounded concrete floor in an office building.

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