Sodium silicate densifiers are cost effective sealers used to harden and densify concrete. They chemically react below the surface to form a permanent calcium silicate hydrate (crystalline) barrier in the pores. Concrete sealed with a sodium silicate densifier experience an increase in surface hardness of up to 45% or more.
There are a few factors that determine what the actual increase in density will be:
- The amount of free lime and calcium available in the pores.
- The size of the pores.
- The amount of sodium silicate applied to the concrete.
The size of calcium silicate hydrate barrier can’t be predicted or controlled. The factors that determine how much caclium silicate hydrate is formed are considered to be variable, and will be different on every area of every concrete slab. On average, 1-2 treatments are applied to concrete floors. On floors that are old and weak, or have water or moisture issues, additional treatments may be required.
Best Sodium Silicate Concrete Densifiers
- Armor S2000 Concrete Sealer Review (concentrated)
- Stone Technolgies X-1 Concrete Sealer Review (pre-diluted)
- Ashford Formula Concrete Sealer Review (pre-diluted)
There are several sodium silicate concrete densifiers that can be used to seal concrete. The primary difference between most manufacturers is the form in which the silicate is sold – concentrated vs pre-diluted. Concentrated densifiers require you to mix with water on-site, while pre-diluted densifiers are sold already diluted with water.
Concentrated sodium silicate densifiers offer several benefits, including:
- Cost effective – you only pay for silicate, not for water.
- Flexible – you can change the dilution ratio to account for old and porous concrete, or wet concrete surfaces.
Sodium Silicate Concrete Densifier Uses
Sodium silicate concrete densifiers are used in a variety of applications. Their most common uses are:
- Concrete driveways and walkways
- Garage floors
- Concrete floors and warehouse floors
- Basement floors and walls
Concrete densifiers are great sealers for increasing the surface strength and density of concrete. They are also great sealers for reducing the movement of water and moisture up through the pores of the concrete. Sodium silicate densifiers should not be confused with Silane-Siloxane water repellent sealers. Concrete sealed with a sodium silicate densifier will still absorb water on the surface. If you require the concrete to repel surface water, you need to use a Silane-Siloxane concrete sealer. Silane-Siloxane sealers can be applied to concrete previously sealed with a sodium silicate concrete sealer so long as it has been at least 7 days since applying the silicate.