The principle of concrete sealing and restoration by crystallization
Weak spots within the concrete
Cement works as binder in concrete and needs water in order to cure in an optimal way. During the curing – called “hydration” –, cement is binding water.
If the proportion of water too high, the evaporating excess share of water will damage the concrete.
More pore formation is generated by using additives (for stabilization, superplasticizer, concrete condenser etc.).
These pores and capillaries can cause reduced tightness especially in case of pressurized water. By the reaction of the ArexA sealant, aluminum and calcium ions, with the water present in the concrete components, an insoluble crystal is formed which grows deeply into the capillary system. As long as humidity is existing in the concrete, crystals keep growing without any limit.
This process occurs with and against water pressure, which leads to the fact that the concrete is curing so dense, that water in liquid condition cannot penetrate any further. The pollutants that have been chemically dissolved in water like chlorides, sulfates etc. can no longer infect the concrete and damage of concrete reinforcement is prevented. After the complete conversion of humidity the process stops. The process of crystallization starts again when there is a fundamental change in the system through water-bearing crack formation.
Our products have been developed in highly innovative and unique specification. Crystallization only starts where it is necessary. Application areas on concrete surfaces are not affected by efflorescence or stresses in the building, coatings of any kind can be subsequently applied without any hindrances. The process of crystallization is competed when no more humidity or water penetrates the concrete. Even if there are slight cracks later, these cracks are healed automatically by crystallization.
There are a huge number of different products with similar specification and therefore it is necessary to get the right advice from our experts for your building project.