Brief description of the extension of the protective effect, in the long term, of a composition based on cement, screw - to - corrosion of steels, inclusive, and allowing this extension product

摘要

The present invention relates to a method aiming to increase the protective effect, in the long term, of a composition based on cement, screw - to - corrosion of steels. & br / the aim is to impart to the reinforced concretes a perpetuation of the resistance of the corrosion of the metal reinforcements that they comprise, the set of specifications attached to this being the simplicity, the saving and the preservation of the mechanical properties. & br / this object is achieved through a protocol which consists in incorporating in the composition of cement and / or in the concrete, mortar or grouts capable of being prepared from this composition, chemical means, to the prolonged action of the passivation of the steels included, said means comprising a system for holding a basic ph, preferably greater than or equal to 11,8 within the concrete, mortar or grout. & br / the invention concerns also a system for holding a basic ph, per se, for reinforced concrete, said system comprising grains of cement, of granulometry selected and the use of the system, in order to extend the protective effect in the long term, screw - to - screw of steels included, of a composition based on cement. & br / application: cements reinforced concrete admixtures and