Densifiers are often used on polished concrete floors to reduce dust and increase durability. They are applied to strengthen the surface, reducing the risk of pitting and micro-chunks occurring on the surface.
Excess water in a newly poured slab can also create a loss of strength and shine during the grinding process. The water in a new concrete surface can rise to the surface, bringing with it small particles of aggregate and laitance. This results in a slab surface that is softer than its core. Applying a densifier creates bonding with available lime in the slab, thereby creating more cementitious rather than aqueous material.
Pores can also be formed in concrete during the curing process due to the porosity of the concrete coupled with the evaporation of water. Strengthening the substrate with a densifier creates surface uniformity, closing pours that could be susceptible to staining from spills.
Densifiers may use various carrying agents to accomplish the hardening process, potassium, sodium, lithium, or other agents.
When to add a densifier to your polished concrete finish.
Densifiers are formulated to chemically react with raw materials to harden and dustproof concrete. They are available in a variety of bases, with silicas being the largest class of products. Densifiers should always be used when there is a question of surface strength or concern over dust. When properly applied, densifiers strengthen the concrete, seal pores and can assist in attaining a high gloss finish.