STUDY TO IMPROVE FIRE RESISTANCE OF ULTRA HIGH PERFORMANCE CONCRETE BY CONDUCTING FIRE TESTS OF UHPC CYLINDER SPECIMENS IN CERAMIC FURNACE
Ultra High Performance Concrete (UHPC) is a new generation of concrete. UHPC not only has superior compressive strength, but also has more durability compared to normal concrete. This kind of concrete is expected to be used in building structures, which are sustainable and economical. In this study, the authors have developed UHPC Mix design using marble powder, instead of quartz powder. This paper was focused on the fire resistance performance of UHPC with marble powder. Cylinders of 10 x 20 cm and 15x 30 cm specimens were made and tested in ceramic furnace. As a structure material, UHPC shall also has a high fire resistance. Different with the normal concrete, UHPC is more sensitive to fire, due to its high packing density. This research was focused on improving the fire resistance of UHPC. Several fire tests have been conducted and mix design of UHPC have been improved in getting higher fire resistance performance. The conducted fire test indicates that fire resistance of UHPC is influenced by composition of the materials. The use of high content silica fume and marble powder weakened the fire resistance. But, this research shows, that the fire resistance of UHPC can be increased from 550ºC to up 1000ºC, by adding Micro Steel Fiber and Polypropylene.