Examining ACI Development Length and Strength Provisions for RC Slabs Strengthened with NSM GFRP

Sama Taha; George Iskander; Mohamed Abou-Zeid; Ezzeldin Sayed-Ahmed

doi:10.56748/ejse.24506

Authors

Sama Taha American University in Cairo
George Iskander University of Calgary https://orcid.org/0000-0001-6692-735X
Mohamed Abou-Zeid American University in Cairo https://orcid.org/0000-0003-3851-6435
Ezzeldin Sayed-Ahmed American University in Cairo https://orcid.org/0000-0003-1416-3620

DOI:

https://doi.org/10.56748/ejse.24506

Keywords:

Reinforced Concrete, One-Way Slabs, Near Surface Mounted, GFRP bars, Repair, Flexural Strengthening

Abstract

This study aims to investigate the strengthening effect of GFRP bars on the capacity of RC slabs when subject to flexure loading. The objective is to show the effect of debonding failure on the capacity of the GFRP strengthened slabs relative to the different variables used. The variables used are the different bonding lengths, diameters, and numbers of GFRP bars in strengthening RC slabs. The work presents the details of the adopted experimental investigation and the results of the flexural tests performed on twelve slabs with the different variables. These results are adopted to validate the currently available design provisions of the ACI code of practice for using NSM GFRP to strengthen RC slabs.

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Author Biographies

Sama Taha, American University in Cairo

Sama Tarek Taha is a graduate student and a teaching assistant at the American University in Cairo. Sama received her BSc and MSc from the American University in Cairo. Sama’s research interests include the design and behaviour of fiber reinforced concrete.

Mohamed Abou-Zeid, American University in Cairo

Mohamed Nagib Abou-Zeid is a professor of construction at The American University in Cairo. Mohamed received his PhD from the University of Kansas in 1994 with honors. He joined AUC in 1997 as a full-time faculty member. He has held several positions at AUC including the chair of the University Senate, the chair of the Academic Integrity Council and the chair of the Department of Construction and Architectural Engineering. Mohamed’s research interests include a variety of topics in structural engineering.

Ezzeldin Sayed-Ahmed, American University in Cairo

Ezzeldin Yazeed Sayed-Ahmed is a professor and chair of the Department of Construction Engineering at The American University in Cairo. He received his PhD from the University of Calgary. He is a fellow of the Academy of Scientific Research and Technology (ASRT), and a reinforced concrete and steel structures consultant in Egypt. Ezzeldin's research interests include a variety of topics in structural engineering and biomechanics.

References

Abbood, Imad S., Odaa, Sief aldeen, Hasan, Kamalaldin F. and Jasim, Mohammed A., “Properties evaluation of fiber reinforced polymers and their constituent materials used in structures – A review”, Materials Today: Proceedings, July 2020.

ACI Committee 440.2. “Guide For the Design And Construction Of Externally Bonded FRP Systems For Strengthening Concrete Structure”. ACI American Concrete Institute. 2008.

Aydin, F. and M. Saribiyik. “Compressive and Flexural Behavior of Hybrid Use of GFRP Profilewith Concrete.” International Symposium on Sustainable Development. Materials Science. 2010.

Behzard, Pejman, Sharbatdar, Mohammad and Kheyroddin, Ali. “Different NSM FRP technique for strengthening of RC two-way slabs with low clear cover thickness”. Scientia Iranica. 23. 2016. DOI: https://doi.org/10.24200/sci.2016.2136

Bilotta, Antonio, Ceroni, Francesca, et al. “Bond of NSM FRP-Strengthened Concrete: Round Robin Test Initiative”. Journal of Composites for Construction, American Society for Civil Engineering. 2015. DOI: https://doi.org/10.1061/(ASCE)CC.1943-5614.0000579

Carolin, Anders. “Carbon Fibre Reinforced Polymers for Strengthening of Structural Elements.” Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering., Luleå Tekniska Universitet, 2003.

Coelho, Mário, Sena-Cruz, Jose and Neves, Luis. “A review on the bond behavior of FRP NSM systems in concrete”. Construction and Building Materials. 93. 2015. DOI: https://doi.org/10.1016/j.conbuildmat.2015.05.010

De Lorenzis, Laura, Nanni, Antonio and La Tegola, Antonio. “Strengthening of Reinforced Concrete Structures with Near Surface Mounted FRP Rods”. International Meeting on Composity Materials, PLAST 2000. 2000. Italy.

De Lorenzis, Laura and Teng, J.G.. “Near-Surface Mounted FRP Reinforcement: An Emerging Technique for Strengthening Structures”. Composites Part B: Engineering. 2007. DOI: https://doi.org/10.1016/j.compositesb.2006.08.003

El-Hacha, Raafat and Rizkalla, S.H.. “Near-surface-mounted fiber-reinforced polymer reinforcements for flexural strengthening of concrete structures”. ACI Structural Journal. 101. 2004. DOI: https://doi.org/10.14359/13394

Engauge Digitizer Software. December 2021

Gunaslan, Sultan Erdemlı, and Abdulhalim Karasin. “Confining Concrete Columns with FRP Materials.” European Scientific Journal, ISSN: 1857 – 7881, Apr. 2017, pp. 464–470. Accessed on 2, May 2021.

Hosen, Md Akter, U. Johnson Alengaram, Mohd Zamin Jumaat and N. H. Ramli Sulong, Kh. Mahfuz ud Darain. “Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique.” Polymers vol. 9,5 180. 19 May. 2017. DOI: https://doi.org/10.3390/polym9050180

Hsieh, Chia-Tsung and Lin, Yiching, “Detecting debonding flaws at the epoxy–concrete interfaces in near- surface mounted CFRP strengthening beams using the impact–echo method” NDT&E International. May 2016. DOI: https://doi.org/10.1016/j.ndteint.2016.05.001

Kang, T.HK., Howell, J., Kim, S. et al. A State-of-the-Art Review on Debonding Failures of FRP Laminates Externally Adhered to Concrete. Int J Concr Struct Mater 6, 123–134 (2012). https://doi.org/10.1007/s40069-012-0012-1. DOI: https://doi.org/10.1007/s40069-012-0012-1

Makhlouf, Aly. Kareem Mostafa, Sarah Rezk, Seif Eteifa and Ziad El Abd. “Testing Near-Surface Mounted Reinforcement in Concrete Using Glass Fibre-Reinforced Polymer”. American University in Cairo. Department of Construction Engineering. Supervised by Dr. Ezzeldin Yazeed and Dr. Mohamed AbouZeid. 2015.

Mohamedien, Mohamed A., Hosny, Abdel-Hady and Abdelrahman, Amr. “Use of FRP in Egypt, Research Overview and Applications”. Procedia Engneering 54 2-21, 2013. DOI: https://doi.org/10.1016/j.proeng.2013.03.003

Parvin, Azadeh and Taqiuddin Syed Shah. "Fiber Reinforced Polymer Strengthening of Structures by Near-Surface Mounting Method." Polymers: 1-4. 2016. DOI: https://doi.org/10.3390/polym8080298

Pultron Composites. “World's Largest GFRP Rebar Project Embraces Corrosion-Free Future.” Pultron Composites. 13 Aug. 2019, www.pultron.com/composite-blog/worlds-largest-gfrp-project/

Salman, Wissam. “Strengthening of Reinforced Concrete One-Way Slabs with Opening using CFRP Strips in Flexural”. International Journal of Science and Research (IJSR) Volume 4 Issue 5. May 2015.

Sathishkumar, TP., Satheeshkumar, S. and Naveen, J. “Glass fiber-reinforced polymer composites – a review”. Journal of Reinforced Plastics and Composites. Vol. 33 (13) 1258–1275. 2014. DOI: https://doi.org/10.1177/0731684414530790

Schoeck ComBAR Brochure and Properties. August 2018. Accessed on 19, September 2019.

Schoeck ComBAR Technical Information. 2018.

Soliman, Shehab M., El-Salakawy, Ehab and Benmokrane, Brahim. “Flexural behaviour of concrete beams strengthened with near surface mounted fibre reinforced polymer bars”. Canadian Journal for Civil Engineering Vol. 37. 2010. DOI: https://doi.org/10.1139/L10-077

Soror, A. Y., et al. “State of the Art Review: Flexural Strengthening of Reinforced and Pre-Stressed Concrete Beams Using Fiber Reinforced Polymers.” Engineering Research Journal, vol. 42, no. 2, Apr. 2019. DOI: https://doi.org/10.21608/erjm.2019.66276

Szabó, Zsombor and Balázs, György. “Near surface mounted FRP reinforcement for strengthening of concrete structures”. Periodica Polytechnica-civil Engineering. 2007. DOI: https://doi.org/10.3311/pp.ci.2007-1.05

Xing, Guohua, Chang, Zhaoqun and Ozbulut, Osman. “Behavior and failure modes of reinforced concrete beams strengthened with NSM GFRP or aluminum alloy bars”. 2018. DOI: https://doi.org/10.1002/suco.201700099