Structural response of self-compacting concrete beams under elevated temperature

Abstract

Aim of the research work is to examine the behaviour of Self-Compacting Concrete subjected (SCC) to elevated temperature. This research work examines the effect of water cooling on flexural behaviour of M25 and M40 grade SCC. The results of the investigation will enable the designers to choose the appropriate material for fire safety considerations. To understand the effect of elevated temperatures on different grades of reinforced Self-Compacting Concrete (SCC) beams an extensive experimental investigation was carried out. The effect of different cover thickness and different percentages of tensile reinforcement were also studied. Ultimate load, deflection, stiffness, and energy absorption capacity of the specimens subjected to temperature based on ISO 834 standard fire curve. The heated specimens were either air or water cooled to evaluate the impact of the type of cooling. The results indicated a significant reduction in strength, Energy Absorption Capacity (EAC) and stiffness in case of higher grade SCC specimens with lower cover thickness when subjected to elevated temperatures. An increase in cover thickness was found to improve the overall fire response of beam specimens. The deterioration of strength properties was found to be dependent on the type of cooling conditions and the percentage of tension reinforcement adopted. SCC being a high performance concrete, it is essential to evaluate the performance under fire conditions. This research work provides the behaviour and physical characteristics of SCC subjected to elevated temperature as per ISO rate of heating. The experimental data will enable the engineers to estimate the capacity of fire affected SCC.