Quality waterproofing starts with quality concrete. Quality concrete means strong, dense concrete with the fewest pores. Due to its high density, concrete itself increases the water resistance of the entire building or structure. In the event of a violation of the main waterproofing, high-quality concrete serves as an additional degree of protection.
Special additives are used to increase the water resistance of concrete. The effect of these additives is mainly reduced to clogging in concrete or a solution of capillaries and other leaks with a cross section of more than 1 micron, through which moisture migrates, as well as to improve the structure, increase the density of cement stone and impart water-repellent (hydrophobic) properties to concrete and mortar.
Water repellent additives
Due to the contradictions inherent in the very nature of cement, science faced the problem of how to change the properties of cement so that it becomes less hydrophilic and even acquires water repellency, but at the same time could interact with water at those stages of application when it practically necessary. This cement was called hydrophobic (water-repellent).
The term “hydrophobic” refers not only to cement powder, but also to cement paste and cement stone obtained from such cement.
The hydrophobicity of cement is achieved by introducing special hydrophobizing additives. However, here you should pay attention to the difference between hydrophobic and hydrophobic additives. The former, for example paraffin, stearic acid or calcium salts of higher fatty or naphthenic acids, when mixed with cement, do not react with it and remain in the form of mechanical impurities. The latter, for example, water-soluble sodium and potassium soaps of fatty, petroleum and resin acids, are not hydrophobic in themselves, but form hydrophobic substances as a result of chemical interaction with cement.
Water repelling additives with stearic acid Malaysia are substances that impart hydrophobic (water-repellent) properties to the walls of pores and capillaries in concrete.
The mechanism of action of hydrophobic additives is that, upon contact with the products of cement hydration, they are deposited in the form of tiny droplets on the walls of small pores and capillaries, forming hydrophobic coatings. This results in a contact having a reciprocal angle at which surface tension forces push the water out of the pores.
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