SURFACE DEACTIVATOR THAT CAN BE REMOVED WHEN DRY

摘要

The invention relates to an emulsion constituted of an oily phase dispersed in an aqueous phase, comprising a non-quaternary amino surfactant which is a diamine of the following formula; and an acid having a set-retarding effect and also to a process for the preparation thereof. It furthermore relates to a process for the surface deactivation of a hydraulic composition, comprising the steps consisting in; (a) forming the hydraulic composition; (b) applying, to the surface of the hydraulic composition, the emulsion according to the invention, which by breaking releases the oily phase; and (c) after hardening of the hydraulic composition, removal of the film formed with the surface layer of unhardened hydraulic composition.