SUMMARY Extreme environmental conditions, such as exposure to high temperatures, are serious potential risks for buildings and structures. The behavior of concrete, after exposure to a high temperature, depends upon the specific concrete mix proportions, the constituents used and the physicochemical transformations that the heating generates. The purpose of this paper is to evaluate the
... [Show full abstract] mechanical properties after exposure to a single cycle at high temperatures (T= 500 °C) of a cement-based composite with glass or cellulose fibers. The overall behavior in bending is considered. Four types of cement based composites were prepared using fiber cellulose, polypropylene and glass fibers. Specimens were treated in an electric furnace at 500°C. The corresponding bending strengths were determined, and fracture behavior was studied using interferometric measurements. A physical analysis was also performed by the use of microscopy observation (SEM).