Effectiveness of Prolonged Air-Recuring on Strength of Fire Damaged RC Columns
In this study, the effect of post-fire prolonged air-recuring on the recovery of strength of reinforced concrete was investigated after exposing to elevated temperature levels varying from 300 ºC to 900 ºC. The main objective of the paper is to find the effectiveness of prolonged air-recuring on strength of fire damaged RC columns. In order to achieve this, a total of 24 reinforced concrete circular columns having size 200 1200 mm were casted and tested under compressive loading. Eighteen specimens were heated in an electric furnace such that six specimens at each temperature level i.e. 300ºC, 500 ºC and 900 ºC. After heating, specimens were allowed to cool down naturally at ambient temperature and then specimens were air-recured in open environment (high humidity) following by repairing of respective specimens with various confinement techniques. After post fire prolonged air-recuring, test results showed that decrease in axial compressive at all temperature levels was less compared to values reported in literature for corresponding temperatures. This confirms the recovery of microstructure and thus increase in strength of post heated reinforced concrete circular columns due to prolonged air-recuring. It has been observed that both the confinement techniques i.e. single layer of CFRP only and epoxy injection, steel wire mesh filled with epoxy resin mortar along with CFRP wrapping restored the original strength or even more of air-recured post heated reinforced concrete circular columns compared to that of un-heated control specimens or even more.
Zhou, Jun, and Lu Wang. “Repair of Fire-Damaged Reinforced Concrete Members with Axial Load: A Review.” Sustainability 11, no. 4 (February 13, 2019): 963. doi:10.3390/su11040963.
Yaqub, M., C.G. Bailey, P. Nedwell, Q.U.Z. Khan, and I. Javed. “Strength and Stiffness of Post-Heated Columns Repaired with Ferrocement and Fibre Reinforced Polymer Jackets.” Composites Part B: Engineering 44, no. 1 (January 2013): 200–211. doi:10.1016/j.compositesb.2012.05.041.
Yaqub, M., and C.G. Bailey. “Repair of Fire Damaged Circular Reinforced Concrete Columns with FRP Composites.” Construction and Building Materials 25, no. 1 (January 2011): 359–370. doi:10.1016/j.conbuildmat.2010.06.017.
Bisby, L.A., J.F. Chen, S.Q. Li, T.J. Stratford, N. Cueva, and K. Crossling. “Strengthening Fire-Damaged Concrete by Confinement with Fibre-Reinforced Polymer Wraps.” Engineering Structures 33, no. 12 (December 2011): 3381–3391. doi:10.1016/j.engstruct.2011.07.002.
Yaqub, M., and C.G. Bailey. “Non-Destructive Evaluation of Residual Compressive Strength of Post-Heated Reinforced Concrete Columns.” Construction and Building Materials 120 (September 2016): 482–493. doi:10.1016/j.conbuildmat.2016.05.022.
Al-Kamaki, Yaman SS, Riadh Al-Mahaidi, and Ian Bennetts. “Strength Model for Heat-Damaged Reinforced Concrete Circular Columns Confined with Carbon Fibre Reinforced Polymer Fabrics.” Journal of Reinforced Plastics and Composites 34, no. 22 (August 21, 2015): 1833–1855. doi:10.1177/0731684415601901.
Huo, Jingsi, Guowang Huang, and Yan Xiao. “Effects of Sustained Axial Load and Cooling Phase on Post-Fire Behaviour of Concrete-Filled Steel Tubular Stub Columns.” Journal of Constructional Steel Research 65, no. 8–9 (August 2009): 1664–1676. doi:10.1016/j.jcsr.2009.04.022.
Anasco Bastin, Danie Roy, Umesh Kumar Sharma, and Pradeep Bhargava. “A Study on Different Techniques of Restoration of Fire Damaged Reinforced Concrete Flexural Members.” Journal of Structural Fire Engineering 8, no. 2 (June 12, 2017): 131–148. doi:10.1108/jsfe-03-2017-0026.
Hosseinpour, M., M. Celikag, and H. Akbarzadehbengar. “Strengthening and Shape Modification of Fire-Damaged Concrete with Expansive Cement Concrete and CFRP Wrap.” Scientia Iranica 26, (November 14, 2017): 699-708. doi:10.24200/sci.2017.4592.
Tayeh, Bassam A., Mohammed Abu Naja, Samir Shihada, and Mohammed Arafa. “Repairing and Strengthening of Damaged RC Columns Using Thin Concrete Jacketing.” Advances in Civil Engineering 2019 (June 11, 2019): 1–16. doi:10.1155/2019/2987412.
Chen, G.M., Y.H. He, H. Yang, J.F. Chen, and Y.C. Guo. “Compressive Behavior of Steel Fiber Reinforced Recycled Aggregate Concrete after Exposure to Elevated Temperatures.” Construction and Building Materials 71 (November 2014): 1–15. doi:10.1016/j.conbuildmat.2014.08.012.
Poon, Chi-Sun, Salman Azhar, Mike Anson, and Yuk-Lung Wong. “Strength and Durability Recovery of Fire-Damaged Concrete after Post-Fire-Curing.” Cement and Concrete Research 31, no. 9 (September 2001): 1307–1318. doi:10.1016/s0008-8846(01)00582-8.
Ma, Ying, Yi Che, and Jinxin Gong. “Behavior of Corrosion Damaged Circular Reinforced Concrete Columns Under Cyclic Loading.” Construction and Building Materials 29 (April 2012): 548–556. doi:10.1016/j.conbuildmat.2011.11.002.
Akbas, B., J. Shen, and H. Hao. “Energy Appproach in Peformance-Based Seismic Design of Steel Moment Resisting Frames for Basic Safety Objective.” The Structural Design of Tall Buildings 10, no. 3 (2001): 193–217. doi:10.1002/tal.172.
El-Gamal, Sherif, Khalifa Al-Jabri, Ahmed Al-Mahri, and Saud Al-Mahrouqi. “Effects of Elevated Temperatures on the Compressive Strength Capacity of Concrete Cylinders Confined with FRP Sheets: An Experimental Investigation.” International Journal of Polymer Science 2015 (2015): 1–10. doi:10.1155/2015/549187.
Al-Nimry, Hanan, Rami Haddad, Saad Afram, and Mohammed Abdel-Halim. “Effectiveness of Advanced Composites in Repairing Heat-Damaged RC Columns.” Materials and Structures 46, no. 11 (February 6, 2013): 1843–1860. doi:10.1617/s11527-013-0022-8.
Zahid, MZA Mohd, BH Abu Bakar, FM Nazri, MM Ahmad, and K Muhamad. “Review of Repair Materials for Fire-Damaged Reinforced Concrete Structures.” IOP Conference Series: Materials Science and Engineering 318 (March 19, 2018): 012023. doi:10.1088/1757-899x/318/1/012023.
Elsanadedy, Hussein, Tarek Almusallam, Yousef Al-Salloum, and Rizwan Iqbal. “Effect of High Temperature on Structural Response of Reinforced Concrete Circular Columns Strengthened with Fiber Reinforced Polymer Composites.” Journal of Composite Materials 51, no. 3 (July 28, 2016): 333–355. doi:10.1177/0021998316645171.
- There are currently no refbacks.
Copyright (c) 2019 Muhammad Adeel Ehsan
This work is licensed under a Creative Commons Attribution 4.0 International License.