On high temperature behaviour of hpfrc thin plates

An experimental programme on thin plates is presented to investigate the high temperature residual behaviour in bending of a high performance fibre reinforced concrete (HPFRC). The matrix is characterize by high compressive strength (Rck 120 MPa) and by a steel micro-fibre content of 1.2% by volume. The mechanical characterization was performed after thermal cycles up to three thermal thresholds (300, 600 and 900°C). The results show a scantly reduction of serviceability strength up to 300 °C and an almost quasi-linear dependency of first cracking and residual strengths on temperature, although also a brittleness in the post-peak behaviour due to fibre failure takes place.