Effect of Elevated Temperatures on Flexural Behaviour of Hybrid Fibre Reinforced High Strength Concrete

Abstract

The structural properties of concrete have been studied most widely as a function of compressive strength at elevated temperature. However, only a limited number of studies have been conducted on the flexural behaviour of High Strength Concrete (HSC) at elevated temperature.

In this paper, an investigation of the flexural behaviour (bending strength and fracture energy) of HSC and Hybrid-Fibre-Reinforced High Strength Concrete (HFRHSC) was carried out. Physical properties and fracture energy were evaluated during heat exposure (hot test) and after heat exposure (residual test).

The results show maximum load decreased suddenly at 200 °C under the hot test environment. For specimens containing steel fibres, the maximum load did not drop suddenly in the hot test condition. It was verified from the Load-Crack Mouth Opening Displacement (CMOD) curve.

In the hot tests, the HFRHSC mixture was very effective in preventing brittle fracture.

Citation

Watanabe, K., Bangi, M. and Horiguchi, T. (2010), "Effect of Elevated Temperatures on Flexural Behaviour of Hybrid Fibre Reinforced High Strength Concrete", Journal of Structural Fire Engineering, Vol. 1 No. 1, pp. 17-28. https://doi.org/10.1260/2040-2317.1.1.17