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Title: Influence of the Emulsions to the Interface Formwork/Concrete

Author(s): Laurent Libessart, Amine Lahlou, Chafika Djelal, Yannick Vanhove, and Sandrine Mateo

Publication: Symposium Paper

Volume: 326


Appears on pages(s): 123.1-123.10

Keywords: emulsion, concrete, formwork, interface, adhesion energy, facing aspect, image analysis

DOI: 10.14359/51711106

Date: 8/10/2018

The concrete is the ultimate building materials today and answers all the requirements of the modern architecture. The emulsion or the release agents are used to facilitate the concrete demoulding and to protect the formwork surfaces against corrosion. The final quality of the facings depends on the physicochemical characteristics of the demoulding products used. They must be selected according to the nature of the formwork and their compatibility with the casing skins. They must be consistently applied to the unit of the formwork, to a clean surface, in thin layers, uniform thickness. This agent must allow a placement of the more effective concrete while adhering perfectly to the formwork. The adherence of oil with the support is thus very important. It is studied by the determination of the adhesion energy Solid/Liquid on a formwork surface. This study is interested more particularly in the emulsions. Two forms are distinguished: Mineral reverses emulsion with the dispersed phase is water and Vegetable direct emulsion with the dispersed phase is oil. The first physicochemical results show an influence of the temperature on the adhesion energy. The quality of the concrete facings demoulded with emulsions appears better qualities that those carried out with oils demoulding.