FIRE RESISTANCE OF DIFFERENT FIBRE REINFORCED HIGH-PERFORMANCE CONCRETES

摘要

The development of cement based materials has reached a permanent upside trend within the former decades. From the point of time, the last step in this development row is high-strength concrete (HSC), self-compacting concrete (SCC) and ultra high-strength concrete (UHSC). To be able to use the high efficiency of HSC, SCC and UHSC additional concepts for the application and the construction explanation are necessary. The concrete recipes have to be developed according to the application case, if the high efficiency and the costs shall be considered together. One aspect which is not sufficiently cleared for such eementious materials is their spalling behaviour and the fire resistance. Because of the increasing use of HSC, SCC and UHSC for constructions such as bridges and high-rise buildings, the importance of constructive fire protection must be considered in design. Therefore, several tests were carried out to evaluate and to determine the spalling behaviour of different high-strength, self-compacting and ultra-high strength concretes with and without fibres. The paper will give a general survey on the spalling mechanisms due to fire exposure as well as an overview on the test results for the reduction of spalling for such high-performance cement based materials.