The Fire Effect on the Performance of Reinforced Concrete Beams with Partial Replacement of Coarse Aggregates by Expanded Clay Aggregates
Received: 18 September 2023 | Revised: 6 October 2023 | Accepted: 9 October 2023 | Online: 5 December 2023
Corresponding author: Alaa H. Abdullah
Abstract
This paper aims to investigate the flexural behavior of reinforced concrete beams considering fire resistance by adding Lightweight Expanded Clay Aggregates (LECA) to the concrete mix as partial coarse aggregate replacement. LECA is a type of porous clay with a uniform pore structure with fine, closed cells and hard, tightly sintered skin. The experimental work comprised four reinforced self-compacted concrete beams. All the specimens were identical in their geometrical layout of 1600×240×200 mm, reinforcement details, and support condition (simply supported). For all the beams, the main reinforcement was provided by two bars, each having a diameter of 12 mm, while a bar of 6 mm diameter was employed for the top and shear reinforcement. Each beam had a different replacement ratio of LECA for coarse aggregates (0, 10, 20, and 30%). All the specimens were tested under static two concentrated loads after being exposed to the fire of steady-state temperature (500 oC), 1 hr duration, and sudden cooling process. The results showed that adding LECA reduced the number and width of the generated cracks due to fire and reduced the deterioration of the ultimate load capacity and beam rigidity (stiffness).
Keywords:
reinforced concrete beams, fire effect, Lightweight Expanded Clay Aggregates (LECA)Downloads
References
A. H. Buller, M. Oad, B. A. Memon, and S. Sohu, "24-hour Fire Produced Effect on Reinforced Recycled Aggregates Concrete Beams," Engineering, Technology & Applied Science Research, vol. 9, no. 3, pp. 4213-4217, Aug. 2019.
A. H. Buller, M. Oad, and B. A. Memon, "Flexural Behavior of Reinforced RAC Beams Exposed to 1000°C Fire for 18 Hours," Engineering, Technology & Applied Science Research, vol. 9, no. 3, pp. 4225-4229, Aug. 2019.
Q. Ma, R. Guo, Z. Zhao, Z. Lin, and K. He, "Mechanical properties of concrete at high temperature—A review," Construction and Building Materials, vol. 93, pp. 371-383, 2015.
S. Real, M. G. Gomes, A. M. Rodrigues, and J. A. Bogas, "Contribution of structural lightweight aggregate concrete to the reduction of thermal bridging effect in buildings," Construction and Building Materials, vol. 121, pp. 460-470, 2016.
ASTM C330/C330M-14: Standard Specification for Lightweight Aggregates for Structural Concrete. ASTM International, 2017.
H. Tanyildizi and A. Coskun, "The effect of high temperature on compressive strength and splitting tensile strength of structural lightweight concrete containing fly ash," Construction and building materials, vol. 22, no. 11, pp. 2269-2275, 2008.
H. Tanyildizi and A. Coskun, "Performance of lightweight concrete with silica fume after high temperature," Construction and Building Materials, vol. 22, no. 10, pp. 2124-2129, 2008.
"Catalog," Leca AE. https://leca.ae/catalog/.
A. Ali, Z. Soomro, S. Iqbal, N. Bhatti, and A. F. Abro, "Comparison of Mechanical Properties of Lightweight and Normal Weight Concretes Reinforced with Steel Fibers," Engineering, Technology & Applied Science Research, vol. 8, no. 2, pp. 2741-2744, Apr. 2018.
R. Nemes, M. A. Abed, A. M. Seyam, and É. Lublóy, "Behavior of structural lightweight concrete produced with expanded clay aggregate and after exposure to high temperatures," Journal of Thermal Analysis and Calorimetry, vol. 147, no. 15, pp. 8111–8118, Aug. 2022.
F. Dabbaghi, A. Tanhadoust, M. L. Nehdi, M. Dehestani, and H. Yousefpour, "Investigation on optimal lightweight expanded clay aggregate concrete at high temperature based on deep neural network," Structural Concrete, vol. 23, no. 6, pp. 3727-3753, Jun. 2022.
F. Dabbaghi, S. Nasrollahpour, M. Dehestani, and H. Yousefpour, "Optimization of Concrete Mixtures Containing Lightweight Expanded Clay Aggregates Based on Mechanical, Economical, Fire-Resistance, and Environmental Considerations," Journal of Materials in Civil Engineering, vol. 34, no. 2, Feb. 2022, Art. no. 04021445.
F. Dabbaghi, M. Dehestani, and H. Yousefpour, "Residual mechanical properties of concrete containing lightweight expanded clay aggregate (LECA) after exposure to elevated temperatures," Structural Concrete, vol. 23, no. 4, pp. 2162–2184, 2022.
F. Dabbaghi, T. Y. Yang, A. Tanhadoust, S. B. Emadi, M. Dehestani, and H. Yousefpour, "Experimental and numerical investigation on post-fire seismic performance of light weight aggregate reinforced concrete beams," Engineering Structures, vol. 268, Oct. 2022, Art. no. 114791.
Iraqi Standard No. 5, Portland Cement., The Central Organization for Standardization and Quality Control, Iraq, 2019.
Iraqi Specification, No.45, Aggregate from Natural Sources for Concrete and Construction, The Central Organization for Standardization and Quality Control, Iraq 1984.
ASTM E119: Standard Test Methods for Fire Tests of Building Construction and Materials. ASTM International.
R. Kumar, R. Lakhani, and A. Kumar, "Physico-Mechanical and Thermal Properties of Lightweight Structural Concrete with Light Expanded Clay Aggregate for Energy-Efficient Buildings," in Advances in Construction Materials and Sustainable Environment, Singapore, 2022, pp. 175–185.
A. H. Abdullah and S. D. Mohammed, "Effect of lightweight expanded clay aggregate as partial replacement of coarse aggregate on the mechanical properties of fire-exposed concrete," Journal of the Mechanical Behavior of Materials, vol. 32, no. 1, Jan. 2023.
Y. Song et al., "Residual shear capacity of reinforced concrete beams after fire exposure," KSCE Journal of Civil Engineering, vol. 24, no. 11, pp. 3330-3341, 2020.
J. M. Zhu, X. C. Wang, D. Wei, Y. H. Liu, and B. Y. Xu, "Estimation of the Residual Stiffness of Fire-Damaged Concrete Members," Computers, Materials & Continua, vol. 22, no. 3, pp. 261–274, 1970.
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