Residual Strength of Heated Reinforced Cement Concrete Columns
Journal of Structural Engineering, Vol. 3, No. 1, pp. 54-69, January 2010
Posted: 1 Feb 2010
Date Written: January 31, 2010
Concrete elements exposed to fire undergo temperature gradients and, as a result, undergo physical changes or spalling, thereby exposing the steel reinforcement. The structural property of concrete that has been most widely studied as a function of temperature exposure is compressive strength. This study was carried out to generate experimental data on residual strength of heated Reinforced Cement Concrete (RCC) columns. A total of 24 RCC columns were cast with similar cross-sectional details, length, grade of concrete, reinforcement and clear cover provided to reinforcement. Two columns were kept at each temperature for 3 h, starting from a lower temperature of 100 °C and ending at a high temperature of 1,000 °C with increments of 100 °C. Thereafter, these test specimens were tested for ultimate failure loads, thermal crack widths, Ultrasonic Pulse Velocity (UPV) and rebound hammer values after cooling them to room temperature.
Keywords: Residual Strength, Temperature Exposure, Thermal Crack Width, Ultrasonic Pulse Velocity
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