Structural response of reinforced LECA aggregate concrete slabs subjected to high temperatures

Fadya S. Klak; Muyasser  M. Jomaa'h

doi:10.18282/ice.v6i1.617

Fadya S. Klak Department of Civil Engineering, University of Tikrit, Tikrit 34001, Iraq
Muyasser M. Jomaa'h Department of Civil Engineering, University of Tikrit, Tikrit 34001, Iraq

Ariticle ID: 617

248 Views, 44 PDF Downloads

DOI: https://doi.org/10.18282/ice.v6i1.617

Keywords: reinforced concrete; fire resistance; LECA aggregate; structural response

Abstract

This work reports tests conducted on nine one-way reinforced concrete slabs using lightweight expanded clay aggregate (LECA) as a slab weight reduction technique. Every slab had the same dimensions, steel reinforcement, and the same composition of concrete. The slabs were heated from their bottom faces through a fire chamber and subjected to a sustained line load. The specimens’ fire resistance performance and mechanical characteristics were evaluated after they had undergone the same testing conditions. The study parameters were the replacement of coarse aggregate with different percentages of LECA (20%, 40%), and different temperatures (400 ℃ and 700 ℃). Compared to the reinforced normal-weight concrete slab, the reinforced LECA aggregate concrete slabs’ fire resistance and flexural strength decreased by LECA. The slabs’ deflection rose as the LECA increased. The largest increase in slab deflection was 37.2%, while the most notable decrease in ultimate load capacity was roughly 35.1%. The stiffness depreciation was substantial, though, at roughly 50%. The results for LECA-reinforced aggregate slabs not exposed to high temperatures support this conclusion. Reinforced LECA aggregate slabs maintained structural integrity after fire testing.

References

Klak FS, Jomaa’h M, Ahmad S. Behavior of Reinforced Concrete Members Exposed to Fire: Review Article. Tikrit Journal of Engineering Sciences. 2022; 29(4): 56-68. doi: 10.25130/tjes.29.4.7

Husem M. The effects of high temperature on compressive and flexural strengths of ordinary and high-performance concrete. Fire Safety Journal. 2006; 41(2): 155-163. doi: 10.1016/j.firesaf.2005.12.002

Arioz O. Effects of elevated temperatures on properties of concrete. Fire Safety Journal. 2007; 42(8): 516-522. doi: 10.1016/j.firesaf.2007.01.003

Abdullah AI. Structural Behavior of High Strength Laced Reinforced Concrete One Way Slab Exposed to Fire Flame. Civil Engineering Journal. 2019; 5(12): 2747-2761. doi: 10.28991/cej-2019-03091446

Lawson RM. Fire engineering design of steel and composite buildings. Journal of Constructional Steel Research. 2001; 57: 1233-1247.

Kodur VKR, Phan L. Critical factors governing the fire performance of high strength concrete systems. Fire Safety Journal. 2007; 42(6-7): 482-488. doi: 10.1016/j.firesaf.2006.10.006

Jau WC, Huang KL. A study of reinforced concrete corner columns after fire. Cement and Concrete Composites. 2008; 30(7): 622-638. doi: 10.1016/j.cemconcomp.2007.09.009

Gales J, Bisby LA, Gillie M. Unbonded post tensioned concrete in fire: A review of data from furnace tests and real fires. Fire Safety Journal. 2011; 46(4): 151-163. doi: 10.1016/j.firesaf.2011.01.004

Mun KJ. Development and tests of lightweight aggregate using sewage sludge for nonstructural concrete. Construction and Building Materials. 2007; 21(7): 1583-1588. doi: 10.1016/j.conbuildmat.2005.09.009

Demirdag S, Gunduz L. Strength properties of volcanic slag aggregate lightweight concrete for high performance masonry units. Construction and Building Materials. 2008; 22(3): 135-142. doi: 10.1016/j.conbuildmat.2006.10.002

Go CG, Tang JR, Chi JH, et al. Fire-resistance property of reinforced lightweight aggregate concrete wall. Construction and Building Materials. 2012; 30: 725-733. doi: 10.1016/j.conbuildmat.2011.12.081

Hawkins NM, Mitchell D. Progressive collapse of flat slab structures. Journal Proceedings. 1979; 76(7): 775-808.

Kum YJ, Wee TH, Mansur MA. Shear strength of lightweight concrete one-way slabs. Chris Burgoyne’s Publications; 2007.

El-Fitiany SF, Youssef MA. Assessing the flexural and axial behaviour of reinforced concrete members at elevated temperatures using sectional analysis. Fire Safety Journal. 2009; 44(5): 691-703. doi: 10.1016/j.firesaf.2009.01.005

Levesque AP. Fire Performance of Reinforced Concrete Slabs. IntechOpen; 2022.

Bailey CG, Toh WS. Small-scale concrete slab tests at ambient and elevated temperatures. Engineering Structures. 2007; 29(10): 2775-2791. doi: 10.1016/j.engstruct.2007.01.023

Huang Z. The behaviour of reinforced concrete slabs in fire. Fire Safety Journal. 2010; 45(5): 271-282. doi: 10.1016/j.firesaf.2010.05.001

Bratina S, Saje M, Planinc I. The effects of different strain contributions on the response of RC beams in fire. Engineering Structures. 2007; 29(3): 418-430. doi: 10.1016/j.engstruct.2006.05.008

Wade C. Fire resistance of New Zealand concretes (Study Report No. 40). BRANZ; 1991.

Daniel A, Almeida A. Thermal Insulation Characteristics of Structural Lightweight and Normal Weight Concretes Produced with Different Types of Aggregates. Universidade de Lisboa; 2011.

Riad MY, Shoeib AE kareim. Behavior of Structural Lightweight Polystyrene Foam Concrete Flat Slabs When Exposed to Fire. The Open Construction and Building Technology Journal. 2018; 12(1): 362-374. doi: 10.2174/1874836801812010362

Bodnárová L, Hela R, Hubertová M, et al. Behaviour of lightweight expanded clay aggregate concrete exposed to high temperatures. International Journal of Civil & Environmental Engineering. 2014; 8: 1210-1213.

Jawad HK, Waryosh WA. The Effect of Fire Flame on Geopolymer Bubbled Slabs. International journal of modern research in Engineering and Technology. 2021; 6.

Klak FS, Jomaa’h MM. Conventional and lightweight aggregate one-way reinforced concrete slabs subjected to fire and repeated loads: comparative experimental study. Australian Journal of Structural Engineering. 2023; 25(1): 106-123. doi: 10.1080/13287982.2023.2213504

Tan KH, Zhao H. Strengthening of openings in one-way reinforced-concrete slabs using carbon fiber-reinforced polymer systems. Journal of Composites for Construction. 2004; 8: 393-402.

Ateeq QAH, Maneeth PD, Brijbhushan S. An Experiment to scrutinize the impact Of Lightweight Expanded Clay Aggregates (LECA) And Metakaolin on Structural Lightweight Concrete. International Journal of Innovative Technology and Exploring Engineering. 2020; 9(3): 323-328. doi: 10.35940/ijitee.c8021.019320

Rajprakash RN, Krishnamoorthi A. Experimental study on lightweight concrete using LECA. International Journal of ChemTech Research. 2017; 10: 98-109.

Karami H, Teymouri E, Mousavi SF, et al. Experimental Investigation of the Effect of Adding LECA and Pumice on Some Physical Properties of Porous Concrete. Engineering Journal. 2018; 22(1): 205-213. doi: 10.4186/ej.2018.22.1.205

Othman M, Sarayreh A, Abdullah R, et al. Experimental study on lightweight concrete using lightweight expanded clay aggregate (LECA) and expanded perlite aggregate (EPA). Journal of Engineering Science and Technology (JESTEC). 2020; 15: 1186-1201.