Even though there is nothing wrong with the traditional polymer and bituminous concrete waterproofing systems, there come times when membranes and coatings are not applicable. Maybe the surface is not suitable, maybe the external conditions are not ideal or maybe there is just no need for it. In any case, internal waterproofing using admixtures can be a viable alternative.
Waterproofing admixtures are porous materials that have the ability to absorb water and water-borne contaminants. Hydrophobic and pore blocking ingredients react with products of the cement hydration process to produce a hydrophobic material which resists external water, decreasing absorption into the concrete