Flexural Strength of Reinforced Concrete RAC Beams Exposed to 6-hour Fire – Part 2: Rich Mix

A. H. Buller, M. Oad, B. A. Memon

Abstract


In this research work, experimental investigation on flexural strength of reinforced concrete beams exposed to fire for 6-hours at the temperature of 1000˚C is presented. The beams are made with 50% replacement of natural coarse aggregates with recyclable concrete aggregates. A total of 12 reinforced concrete beams using 1:1.5:3 mix (rich mix) and 0.54 water-cement ratio were cast. The beams were prepared in two groups. Group 1 beams were prepared with 50% recyclable aggregates, whereas group 2 beams were cast with all-natural aggregates (control specimens). All beams were exposed to fire at the above-mentioned temperature followed by testing in universal load testing machine under central point load. Comparison of the results reveals that proposed beams show comparable resistance even after exposed to 6-hours fire at 1000°C.


Keywords


fire effect; flexural strength; recycled concrete aggregates

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References


A. A. Bhatti, B. A. Memon, “Strength, Deflection and Cracking Behavior of Concrete Slab Using Demolished Concrete as Coarse Aggregates”, International Journal of Engineering Sciences & Research Technology, Vol. 3, No. 6, pp. 492-506, 2014

M. Oad, B. A. Memon, “Compressive Strength of Concrete Cylinders using Coarse Aggregates from Old Concrete”, 1st National Conference on Civil Engineering (NCCE 2013-14)-(Modern Trends and Advancements), April 28-29, 2014

A. H. Buller, B. A. Memon, “Effect of Fire on Strength of Concrete Cubes with RCA as Coarse Aggregates”, 1st National Conference on Civil Engineering (NCCE 2013-14)-(Modern Trends and Advancements), April 28–29, 2014

B. A. Memon, “Recent Development on Use of Demolished Concrete as Coarse Aggregates”, International Journal of Emerging Technology and Innovative Engineering, Vol. 2, No. 1, pp. 1–11, 2016

D. J. Naus, The Effect of Elevated Temperature on Concrete Materials and Structures – A Literature Review, US Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, Washington, 2006

D. Cree, M. Green, A. Noumowe, “Residual Strength of Concrete Containing Recycled Materials after Exposure to Fire: A Review”, Construction and Building Materials, Vol. 45, pp. 208-223, 2013

W. G. Li, J. Z. Xiao, C. J. Shi, C. S. Poon, “Structural Behavior of Composite Members with Recycled Aggregates Concrete – an Overview”, Advances in Structural Engineering, Vol. 18, No. 6, pp. 919-938, 2015

J. P. B. Vieira, J. R. Correia, J. de Brito, “Post-fire Residual Mechanical Properties of Concrete made with Recycled Concrete Coarse Aggregates”, Cement Concrete Research, Vol. 41, No. 5, pp. 533-541, 2011

A. M. Marques, J. R. Correia, J. de Brito, “Post-Fire Residual Mechanical Properties of Concrete made with Recycled Rubber Aggregate”, Fire Safety Journal, Vol. 18, pp. 49-57, 2013

M. Batayneh, I. Marie, I. Asi, “Use of Selected Waste Materials in Concrete Mixes”, Waste Management, Vol. 27, No. 12, pp. 1870-1876, 2007

V. Kodur, “Properties of Concrete at Elevated Temperatures”, ISRN Civil Engineering, Vol. 2014, ArticleID 468510, 2014

G. Wang, D. Barber, P. Johnson, M. C. Hui, “Fire Safety Provisions for aged Concrete Building Structures”, Procedia Engineering, Vol. 62, pp. 629-638, 2013

T. Drzymała, W. Jackiewicz-Rek, M. Tomaszewski, A. Kus, J. Galaj, R. Sukys, “Effects of High Temperature on Properties of High Performance Concrete (HPC)”, Procedia Engineering, Vol. 172, pp. 256-263, 2017

J. T. Yu, Y. Liu, Z. D. Lu, K. Xiang, “Flexural Performance of Fire Damaged and Rehabilitated Two Span Reinforced Concrete Slabs and Beams”, Structural Engineering and Mechanics, Vol. 42, No. 6, pp. 799-813, 2012

M. A. Salau, O. J. Oseafiana, T. O. Oyegoke, “Effects of Elevated Temperature on Concrete with Recycled Coarse Aggregates”, IOP Conference Series: Materials Science and Engineering, Vol. 96, ArticleID 012078, 2015

American Concrete Institute, ACI 318-05, Building Code Reqirement for Strucrural Concrete, ACI, 2005




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