The Mechanical Properties of HFRC Under Elevated Temperature Exposure

This paper discusses the effect of exposure to elevated temperature on the mechanical properties of hybrid fibre reinforced concrete (HFRC). Literature review indicates that high strength concrete is prone to sudden explosion particularly, when exposed to elevated temperature. Polypropylene fibres (PPF), play an active role in improving spalling resistance of concrete induced to elevated temperature. However, it has less significant effect on the strength of concrete. The proposed HFRC by incorporating Steel Fibre (SF) and Polypropylene Fibre (PPF) with certain ratios is expected to improve the mechanical properties of concrete. The experimental program examined the mechanical properties of HFRC at a temperature of 800°C with four different heating time. The compression and flexural test were conducted on thirty (30) cubes, twenty (20) cylinders and ten (10) beams. From the experimental results, it was found that the HFRC with 0.5% PPF and 0.5% SF has effectively improved the interfacial bonding, lowering the tendency of spalling and increased both the compressive and tensile strength at high temperature. (paper)