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Response of two-way reinforced concrete voided slabs enhanced by steel fibers and GFRP sheets under monotonic loading

  • Adel A. Al-Azzawi (Department of Civil Engineering, College of Engineering, Al-Nahrain University) ;
  • Shahad H. Mtashar (Department of Civil Engineering, College of Engineering, Al-Nahrain University)
  • Received : 2023.01.03
  • Accepted : 2023.03.12
  • Published : 2023.03.25
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Abstract

Various efforts have been made to reduce the weight of concrete slabs while preserving their flexural strength. This will result in reducing deflection and allows the utilization of longer spans. The top zone of the slab requires concrete to create the compression block for flexural strength, and the tension zone needs concrete to join with reinforcing for flexural strength. Also, the top and bottom slab faces must be linked to transmit stresses. Voided slab systems were and are still used to make long-span slab buildings lighter. Eight slab specimens of (1000*1000 (1000*1000 mm2) were cast and tested as two-way simply supported slabs in this research. The tested specimens consist of one solid slab and seven voided slabs with the following variables (type of slab solid and voided), thickness of slab (100 and 125 mm), presence of steel fibers (0% and 1%), and the number of GFRP layers). The voids in slabs were made using high-density polystyrene of dimensions (200*200*50 mm) with a central hole of dimensions (50*50*50 mm) at the ineffective concrete zones to give a reduction in weight by (34% to 38%). The slabs were tested as simply supported slabs under partial uniform loading. The results of specimens subjected to monotonic loading show that the combined strengthening by steel fibers and GFRP sheets of the concrete specimen (V-125-2GF-1%) shows the least deflection, deflection (4.6 mm), good ultimate loading capacity (192 MPa), large stiffness at cracking and at ultimate (57 and 41.74) respectively, more ductility (1.44), and high energy absorption (1344.83 kN.mm); so it's the best specimen that can be used as a voided slab under this type of loading.

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References

  1. Abishek, V. and. Iyappan, G.R (2021), "Study on flexural behavior of bubble deck slab strengthened with FRP", J. Phys.: Conference Series, 2040(2021), https://doi.org/10.1088/1742-6596/2040/1/012018.
  2. ACI 318 (2019), Building code requirements for structural concrete and commentary, American Concrete Institute, Farmington Hills, Michigan.
  3. Adil, A.I., Hejazi, F. and Rashid, R.S.M. (2019), "Voided biaxial slabs - state of art", In IOP Conference Series: Earth and Environmental Science. 357. Institute of Physics Publishing.
  4. Al-Azzawi, A.A. and Al-Asdi, A.J. (2017), "Behavior of one way reinforced concrete slabs with styropor blocks", Adv. Concrete Constr., 5(5), 451-468. https://doi.org/10.12989/acc.2017.5.5.451.
  5. Al-Azzawi, A.A. and Abed, S.A. (2017), "Investigation of the behavior of reinforced concrete hollow-core thick slabs", Comput. Concrete, 19(5), 567-577. https://doi.org/.12989/cac.2017.19.5.567. https://doi.org/10.12989/cac.2017.19.5.567
  6. Al-Azzawi, A.A. and Shallal, M.S. (2021), "Behavior of reinforced sustainable concrete hollow-core slabs", Adv. Concrete Constr., 11(4), 271-284. https://doi.org/10.12989/acc.2021.11.4.271.
  7. Al-Fakher, U., Manalo, A., Ferdous, W., Aravinthan, T.H., Zhuge, Y., Bai, Y. and Edoo, A. (2021), "Bending behaviour of precast concrete slab with externally flanged hollow FRP tubes", Eng. Struct., 241. https://doi.org/10.1016/j.engstruct.2021.112433.
  8. Al-Gasham, T.S., Hilo, A.N. and Alawsi, M.A. (2019), "Structural behavior of reinforced concrete one-way slabs voided by polystyrene balls", Case Studies in Constr. Mater., 11. https://doi.org/10.1016/j.cscm.2019.e00292
  9. Al-Gasham, T.S., Mhalhal, J. and Abid, S.R. (2021), "Quasi-static analysis of biaxial voided slabs with openings", Structures, 33, 4176-4192. https://doi.org/10.1016/j.istruc.2021.07.021.
  10. Alfeehan, A., Abdulkareem, H. and Mutashar, S. (2017), "Flexural behavior of sustainable reactive powder concrete bubbled slab flooring elements", Challenge J. Struct. Mech., 3(2), 81. https://doi.org/10.20528/cjsmec.2017.04.010.
  11. Al kulabi, A.K. and Al zahid, A.A. (2019),"Influence of dynamic loading induced by free fall ball on high-performance concrete slabs with different steel fiber contents", Struct. Monit. Maint., 6(1), 19-32. https://doi.org/10.12989/smm.2019.6.1.019.
  12. Ananda, F., Febriani, O., Pribadi, J.A., Junaidi, J. and Gunawan, S. (2019), "Effect the use of steel fibers (Dramix) on reinforced concrete slab", CSID J. Infrastruct. Develop., 2(2), 183. https://doi.org/10.32783/csid-jid.v2i2.52.
  13. Ayash, N.M., Abd-Elrahman, A.M. and Soliman, A.E. (2020), "Repairing and strengthening of reinforced concrete cantilever slabs using glass fiber-reinforced polymer (GFRP) wraps", Structures, 28, 2488-2506. https://doi.org/10.1016/j.istruc.2020.10.053.
  14. Baarimah, A.O. and Mohsin, S.M.S. (2017), "Behaviour of reinforced concrete slabs with steel fibers", In IOP Conference Series: Materials Science and Engineering, 271. Institute of Physics Publishing.
  15. Chung, J.H., Jung, H.S., Bae, B., Choi, C.H. and Choi, H.K. (2018), "Two-way flexural behavior of donut-type voided slabs", Int. J. Concrete Struct. Mater., 12. https://doi.org/10.1186/s40069-018-0247-
  16. Chung, J.H., Bae, B., Choi, H.K., Jung, H. and Choi, C.H. (2018), "Evaluation of punching shear strength of voided slabs considering the effect of the ratio b0/d", Eng. Struct., 164, 70-81, https://doi.org/10.1016/j.engstruct.2018.02.085.
  17. Gil-Martin, L.M. and Hernandez-Montes, E.(2021),"Review of the reinforcement sizing in the strength design of reinforced concrete slabs", Comput. Concrete, 27(3):211-223, https://doi.org/10.12989/cac.2021.27.3.211
  18. Khalid Heiza, A.K., Meleka, N. and Tayel, M. (2014). "State-of-the art review: Strengthening of reinforced concrete structures-different strengthening techniques", Proceedings of the International Conference on Nano-Technology in constructions, 1, March.
  19. Kristombu Baduge, S., Mendis, P., Ngo, T.D. and Sofi, M. (2019), "Ductility design of reinforced very-high strength concrete columns (100-150 MPa) using curvature and energy-based ductility indices", Int. J. Concrete Struct. Mater., 13(1). https://doi.org/10.1186/s40069-019-0347-y.
  20. Najafi, S. and Borzoo, S. (2022), "Different strengthening designs and material properties on bending behavior of externally reinforced concrete slab", Struct. Monit. Maint., 9(3), 271-287, https://doi.org/10.12989/smm.2022.9.3.271.
  21. Najm, I.N., Daud, R.A. and Al-Azzawi, A.A. (2019), "Behavior of reinforced concrete segmental hollow core slabs under monotonic and repeated loadings", Struct. Monit. Maint., 6(4), 269-289. https://doi.org/10.12989/smm.2019.6.4.269.
  22. Pawar, A.J., Mathew, N.S., Dhake, P.D. and Patil, Y.D. (2022), "Flexural behavior of two-way voided slab", Mater. Today Proceedings, 65(2), 1534-1545. https://doi.org/10.1016/j.matpr.2022.04.500.
  23. Senthil, K., Shailja, B., Saurabh, J.K., Abhishek, R. and Tanzeem, A. (2018), "Study on influence of thickness and span length of flat slab for progressive collapse", Proceedings of the National Conference : Advanced Structures, Materials And Methodology in Civil Engineering (ASMMCE - 2018), 3-4, November.
  24. Wang, L., He, T., Zhou, Y., Tang, S., Tan, J., Liu, Z. and Su, J. (2021), "The influence of fiber type and length on the cracking resistance, durability and pore structure of face slab concrete", Constr. Build. Mater., 282, 122706. https://doi.org/10.1016/j.conbuildmat.2021.122706.
  25. Yaagoob, A.H. and Harba, I.S. (2020), "Behavior of self compacting reinforced concrete one way bubble deck slab", Al-Nahrain J. Eng. Sci., 23(1), 11.
  26. Yadav, S., Sharif Uddin, M., Pal, V.K,, Ahmed, Z. and Gupta, A. (2019), "An experimental study on bubble deck slab system with HDPE balls", Int. J. Innov. Res. Technol., 5(12).