The behavior of hybrid reinforced concrete after heat resistance

This study is trying to provide the behavior of concrete when additional fibers are added under the effect of\ud evaluated temperatures. Three types of polypropylene fibers are used with different length respectively 3 mm, 6\ud mm and 12 mm and two types of steel fibers are used of length respectively of 3cm and 5 cm. Hybrid specimens\ud of concrete are prepared by using two different combinations: 0.5% steel fibers in combination with 0.2%\ud polypropylene fibers by the volume of concrete; and 0.25% of steel fibers in combination with 0.1%\ud polypropylene fibers by the volume of concrete. The specimens were subject to different temperatures. An\ud electric furnace was used to heat the specimens up to 200 0C, 400 0C and 600 0C. The mass loss and compressive\ud strength were determined by using twelve different mixtures