Cover
Vol. 22 No. 1 (2022)

Published: April 30, 2022

Pages: 115-128

Original Article

Shear Behavior of Two-Layer Beams Made of Normal and Lightweight Concrete Layers

Hayder Kadhem Adai AL-Farttoosi 1 Oday A. Abdulrazzaq 1 Haleem K. Hussain 1
1 Department of Civil Engineering, College of Engineering, University of Basrah, Basrah, Iraq
History
  • Received: December 13, 2021
  • Revised: January 10, 2022
  • Accepted: January 16, 2022
  • Available Online: April 24, 2022
DOI

https://doi.org/10.33971/bjes.22.1.14

Abstract

This study investigates the shear strength behavior of two-layer reinforced concrete beams consisting of two different types of concrete. One of the layers made of lightweight concrete (LWC) and the other was normal weight concrete (NWC). A total of 16 shear deficient reinforced concrete beams were fabricated and cast with NWC, LWC, and two-layer beam of both material with different configuration. All the beams were tested under four-point loading after 28 days. The variables of the experimental program include the ratio of thickness of the lightweight concrete layer to the overall depth of beam ( h LW / h ), and concrete compressive strength. Experimental results which include load-deflection response curves along with failure modes for NWC, LWC and two-layer beams. The results showed that all beams failed in a similar mode, due to diagonal tension shear crack. Based on the experimental results it can be also concluded that the shear load is governed by compressive strength of lower layer of the concrete when the shear span to overall depth ( a / h ) of the beams is 2.75 or more. While for the a / h 2.375 and 2.00 the two-layer beam has a significant reduction in the shear capacity compared to the NWC beams and increasing compared to LWC beam. The ratio of experimental shear stress divided by the root square of concrete compressive strength (vexp √f c ' ) , which demonstrates the diagonally cracked concrete's ability to transfer strain and shear was maintained for all configurations greater than 0.17, which is the minimal value recommended by ACI318-19.

Keywords

References

  1. M. A. Nawaz, L. A. Qureshi, B. Ali, and A. Raza, “Mechanical, durability and economic performance of concrete incorporating fly ash and recycled aggregates”, SN Applied Sciences, Vol. 2, No. 2, 2020.
  2. H. K. Adai Al-Farttoosi, O. A. Abdulrazzaq, and H. K. Hussain, “Mechanical Properties of Light Weight Aggregate Concrete Using Pumice as a Coarse Aggregate”, IOP Conference Series: Materials Science and Engineering, Vol. 1090, No. 1, p. 012106, 2021.
  3. W. Nawaz, J. A. Abdalla, R. A. Hawileh, H. S. Alajmani, I. H. Abuzayed, H. Ataya, H. A. Mohamed, “Experimental study on the shear strength of reinforced concrete beams cast with Lava lightweight aggregates”, Archives of Civil and Mechanical Engineering, Vol. 19, No. 4, pp. 981-996, 2019. https://doi.org/10.1016/j.acme.2019.05.003
  4. K. -H. Yang, J. -I. Sim, B. -J. Choi, and E. -T. Lee, “Effect of Aggregate Size on Shear Behavior of Lightweight Concrete Continuous Slender Beams”, ACI materials journal, Vol. 108, No. 5, pp. 501-509, 2011.
  5. H. K. A. AL-Farttoosi, H. K. Hussain, and O. A. Abdulrazzaq, “Flexural behavior of two-layer beams made with normal and lightweight concrete layers”, Periodicals of Engineering and Natural Sciences, Vol. 9, No. 2, pp. 1124-1140, 2021. http://dx.doi.org/10.21533/pen.v9i2.1952.g851
  6. G. Campione and L. La Mendola, “Stress-strain behavior in compression of lightweight fiber reinforced concrete under monotonic and cyclic loads”, Transactions on the Built Environment, Vol. 57, pp. 387-396, 2001.
  7. M. -H. Zhang and O. E. Gjørv, “Microstructure of the interfacial zone between lightweight aggregate and cement paste”, Cement and Concrete Research, Vol. 20, No. 4, pp. 610-618, 1990.
  8. J. A. Bogas, M. G. Gomes, and S. Real, “Bonding of steel reinforcement in structural expanded clay lightweight aggregate concrete: The influence of failure mechanism and concrete composition”, Construction and Building Materials, Vol. 65, pp. 350-359, 2014.
  9. K. H. Mo, U. J. Alengaram, P. Visintin, S. H. Goh, and M. Z. Jumaat, “Influence of lightweight aggregate on the bond properties of concrete with various strength grades”, Construction and Building Materials, Vol. 84, pp. 377-386, 2015. https://doi.org/10.1016/j.conbuildmat.2015.03.040
  10. M. Pecce, F. Ceroni, F. A. Bibbò, and S. Acierno, “Steel-concrete bond behaviour of lightweight concrete with expanded polystyrene (EPS)”, Materials and Structures, Vol. 48, No. 1, pp. 139-152, 2015.
  11. B. Xu, D. V. Bompa, A. Y. Elghazouli, A. M. RuizTeran, and P. J. Stafford, “Behaviour of rubberised concrete members in asymmetric shear tests”, Construction and Building Materials, Vol. 159, pp. 361-375, 2018.
  12. D. V. Bompa and A. Y. Elghazouli, “Ultimate shear behaviour of hybrid reinforced concrete beam-to-steel column assemblages”, Engineering Structures, Vol. 101, pp. 318-336, 2015.
  13. S. Campana, M. Fernández Ruiz, A. Anastasi, and A. Muttoni, “Analysis of shear-transfer actions on one-way RC members based on measured cracking pattern and failure kinematics”, Mag. Concr. Res., Vol. 65, No. 6, pp. 386-404, 2013. https://doi.org/10.1680/macr.12.00142
  14. M. Z. Jumaat, U. J. Alengaram, and H. Mahmud, “Shear strength of oil palm shell foamed concrete beams”, Mater. Des., Vol. 30, No. 6, pp. 2227-2236, 2009.
  15. E. Yasar, C. D. Atis, A. Kilic, and H. Gulsen, “Strength properties of lightweight concrete made with basaltic pumice and fly ash”, Materials Letters, Vol. 57, No. 15, pp. 2267-2270, 2003.
  16. R. M. Korol and K. S. Sivakumaran, “Energy absorption potential of light weight concrete floors”, Canadian Journal of Civil Engineering, Vol. 39, No. 11, pp. 1193-1201, 2012. https://doi.org/10.1139/l2012-107
  17. K. Onoue, H. Tamai, and H. Suseno, “Shock-absorbing capability of lightweight concrete utilizing volcanic pumice aggregate”, Construction and Building Materials, Vol. 83, pp. 261-274, 2015.
  18. P. Shafigh, H. Bin Mahmud, M. Z. Bin Jumaat, R. Ahmmad, and S. Bahri, “Structural lightweight aggregate concrete using two types of waste from the palm oil industry as aggregate”, Journal of Cleaner Production, Vol. 80, pp. 187-196, 2014.
  19. M. Limbachiya, M. S. Meddah, and Y. Ouchagour, “Performance of Portland/Silica Fume Cement Concrete Produced with Recycled Concrete Aggregate”, ACI Materials Journal, Vol. 109, No. 1, pp. 91-100, 2012.
  20. C. -W. Tang, T. Yen, and H. -J. Chen, “Shear behavior of reinforced concrete beams made with sedimentary lightweight aggregate without shear reinforcement”, Journal of Materials in Civil Engineering, Vol. 21, No. 12, pp. 730-739, 2009.
  21. U. J. Alengaram, M. Z. Jumaat, H. Mahmud, and M. M. Fayyadh, “Shear behaviour of reinforced palm kernel shell concrete beams”, Construction and Building Materials, Vol. 25, No. 6, pp. 2918-2927, 2011.
  22. A. C. I. Committee, “Building code requirements for structural concrete (ACI 318-08) and commentary”, 2008.
  23. I. Iskhakov, Y. Ribakov, K. Holschemacher, and T. Mueller, “Experimental investigation of full scale twolayer reinforced concrete beams”, Mechanics of Advanced Materials and Structures, Vol. 21, No. 4, pp. 273-283, 2014. https://doi.org/10.1080/15376494.2012.680673
  24. I. Iskhakov, Y. Ribakov, and K. Holschemacher, “Experimental investigation of continuous two-layer reinforced concrete beams”, Structural Concrete, Vol. 18, No. 1, pp. 205-215, 2017.
  25. A. R. Krishnaraja and S. Kandasamy, “Flexural performance of hybrid engineered cementitious composite layered reinforced concrete beams”, Periodica Polytechnica Civil Engineering, Vol. 62, No. 4, pp. 921929, 2018. https://doi.org/10.3311/PPci.11748
  26. M. Velmurugan, S. Kesavraman, and A. Radhakrishnan, “Experimental study on flexural behaviours of ECC and concrete composite reinforced beams”, International Journal of Civil Engineering and Technology, Vol. 8, No. 2, pp. 282-288, 2017.
  27. W. J. Ge, A. F. Ashour, X. Ji, C. Cai, and D. F. Cao, “Flexural behavior of ECC-concrete composite beams reinforced with steel bars”, Construction and Building Materials, Vol. 159, pp. 175-188, 2018.
  28. S. J. Mohsin and N. S. Mohammed, “Nonlinear analysis of hybrid reinforced concrete beams under flexural load”, IOP Conference Series: Materials Science and Engineering, Vol. 737, No. 1, pp. 1-10, 2020.
  29. P. Dybeł and D. Wałach, “Evaluation of the Development of Bond Strength between Two Concrete Layers”, in IOP Conference Series: Materials Science and Engineering, Vol. 245, No. 3, 2017.