Influence of the application method of release agents on thickness of mould oils

摘要

The parameters likely to influence the appearance of the concrete facings are in particular the casting process of the concrete in the formwork, characteristics of the wall and the nature of the release agent. This study looks at the influence of the thickness of vegetable or mineral-based oils on the aesthetic quality of facings. The thickness of the oil films has been measured with a variant of the PIXE method specially developed for this study. Moreover, to create the conditions of a concrete poured into a formwork, a tribometer for fluid material developed in our laboratory was used. With the help of these devices, the thickness of the oil film before and after the pouring of a concrete in a metallic mould was studied. The vegetable oil film has a good resistance with the concrete friction and a film from 1 to 2 μm is enough to obtain a high quality facing.