Flexural Behavior of Reinforced RAC Beams Exposed to 1000°C Fire for 18 Hours
In order to meet the socio-economic demands around the globe, construction industry not only consumes concrete at a very fast pace but also yields huge amounts of construction and demolishing waste. The phenomenon gives rise to environmental issues due to production of concrete ingredients and due to dumping of the waste. Therefore, one of the solutions is the production of green concrete utilizing demolished waste. This research work studies the effect of prolonged fire (18 hours) on the flexural behavior of reinforced concrete–recycled aggregate beams. The beams were using 50% replacement of natural coarse aggregates with demolished concrete. The beam samples were cast as both normal and rich mix concrete and were cured for 28 days. After curing, the beams were exposed to fire at 1000°C in a purpose made oven, followed by testing in a universal load testing machine under central point load. The test results show that the proposed beams (cast with rich mix) exhibited about 22% reduction in flexural strength. The failure mode of the beams was observed as shear failure.
Keywords:green concrete, fire effect, flexural behavior, demolished waste, recyclable aggregates
Memon B. A., “Recent Development on Use of Demolished Concrete as Coarse Aggregates”, International Journal of Emerging Technology and Innovative Engineering, 2(1), pp: 1 – 11, 2016.
Li W G, Xiao J Z, Shi C J and Poon C S, “Structural Behavior of Composite Members with Recycled Aggregates Concrete – an Overview”, Advances in Structural Engineering, Vol. 18, No. 6, 2015. DOI: https://doi.org/10.1260/1369-43188.8.131.529
Oad M. and Memon B. A., “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 28th – 29th, 2014.
Buller A H and Memon B A, “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 28th – 29th, 2014.
Oad M, Buller A H, Memon B A and Memon N A, “Flexural Stress-Strain Behavior of RC Beams made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete Part-1 (1:2:4 Ratio)”, Engineering Technology and Applied Science Research (ETASR), Vol. 8, No. 3, 2018. DOI: https://doi.org/10.48084/etasr.1982
Oad M, Buller A H, Memon B A, Memon N A and Sohu S, “Flexural Stress-Strain Behavior of RC Beams made with Partial Replacement of Recyclable Concrete Aggregates, Part-2: Rich Mix”, Engineering Technology and Applied Science Research (ETASR), Vol. 8, No. 5, 2018. DOI: https://doi.org/10.48084/etasr.2129
Zareei S A, Ameri F, Shoaei P and Bahrami N, “Recycled Ceramic Waste High Strength Concrete Containing Wollastonite Particles and Micro-Silica: A Comprehensive Experimental Study”, Construction and Building Materials (ELSEVIER), Vo. 201, 2019. DOI: https://doi.org/10.1016/j.conbuildmat.2018.12.161
Sakr K and Elhakim E, “Effect of High Temperature or Fire on Heavy Weight Concrete Properties Used in Nuclear Facilities”, Sixth Arab Conference on the Peaceful Uses of Atomic Energy, Cairo, Egypt, 14 – 18 Dec, 2002.
De Souza A A A and Moredo Jr A L, “The Effect of High Temperatures on Concrete Compression Strength, Tensile Strength and Deformation Modulus”, IBRACON Structures and Material Journal, Vol. 3, No. 4, 2010.
Knyziak P, Kowalski R and Krentowski J, “Fire Damage of RC Structures of a Shopping Center”, Engineering Failure Analysis, Vol. 97, 2019. DOI: https://doi.org/10.1016/j.engfailanal.2018.12.002
ASTM C 293 / C 293M-16, “Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Center-Point Loading”, Annual Book of ASTM Standards, 2008.
Buller A H, Oad M and Memon B A, “Flexural Strength of Reinforced Concrete RAC Beams Exposed to 6-hour Fire – Part 2: Rich Mix”, Engineering Technology and Applied Science Research (ETASR), Vol. 9, No. 1, 2019 DOI: https://doi.org/10.48084/etasr.2494
How to Cite
MetricsAbstract Views: 426
PDF Downloads: 240
Authors who publish with this journal agree to the following terms:
- Authors retain the copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after its publication in ETASR with an acknowledgement of its initial publication in this journal.