Influence of the reuse of OSB and marine plywood formworks on concrete surface aesthetics

摘要

Concrete surface quality is becoming increasingly important because demand for a high level of aesthetics has spread across a wide variety of construction works. Even though it is difficult to clearly define what represents "beauty" in construction materials, existing techniques may be used to quantify the aesthetic properties of concrete. As these properties depend mainly on the type of formwork used, this research project focuses on the reuse of two types of panel-plywood and OSB-and two types of release agent-vegetable oil and mineral oil. The evolution of the surface properties of the concrete was measured through lightness and absorption. For plywood formworks, a modification of surface quality was noticed after 80 reuses; for OSB panels, such changes were observed after only 50 reuses. For both types of formwork, the choice of release oil did not seem to have a major influence on formwork absorption. It was also observed that alkalis caused early degradation of the panels: the release agents were not always effective in avoiding this phenomenon. Finally, although reuse was found not to have any influence on the absorption capacity of the plywood formworks studied, this was not the case for the OSB formworks.