Literature review on the behaviour of UHPFRC at high temperature

The results of several experimental campaigns concerning eight Ultra High-Performance Fibre-Reinforced Concretes (UHPFRCs) carried out in different European industrial and university laboratories are presented and compared in this paper. In the temperature range from 20°C to 850°C the results concerning the compressive strength, the elastic modulus and the thermal strain are presented and analysed. The influence of the testing procedures is discussed as well (for instance, with/without pre-loading during the heating phase). Comparisons are made with the decay curves provided by EC 2, for both ordinary and high-performance concrete. The presentation of the mechanical properties is accompanied by suitable observations made during several fire-resistance tests on small structural members (slabs, columns and beams). The temperature-time curves adopted in the tests were the well-known curves ISO 834 and the Increased Hydrocarbon Temperature Curve (HCinc). Once more, the effectiveness of polypropylene fibres against the risk of spalling is confirmed by the rather extended family of UHPFRCs and by the various geometries of the specimens considered in this paper.