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Cyclic Behaviour of Heat-Damaged Beam−Column Joints Modified with Nano-Silica, Nano-Titanium, and Nano-Alumina

Author

Listed:
  • Yasmin Zuhair Murad

    (Civil Engineering Department, The University of Jordan, Amman P.O. Box 11942, Jordan)

  • Ahmad J. Aljaafreh

    (Civil Engineering Department, The University of Jordan, Amman P.O. Box 11942, Jordan)

  • Ayoub AlMashaqbeh

    (Civil Engineering Department, The University of Jordan, Amman P.O. Box 11942, Jordan)

  • Qusai T. Alfaouri

    (Civil Engineering Department, The University of Jordan, Amman P.O. Box 11942, Jordan)

Abstract

This research is designed to check the potential of modifying concrete with nanomaterials to enhance the cyclic behavior of beam−column joints. It also studies the effect of heat on the cyclic behavior of beam−column joints modified with nanomaterials. Experimental and numerical programs are carried out to explore the cyclic behavior of the heat-damaged and unheated RC joints modified with nanomaterials. Six half-scale exterior RC beam-to-column joints were prepared; two control specimens, two specimens were modified with nano-silica and nano-alumina, and two specimens were modified with nano-silica and nano-titanium. The cement was replaced by 1.33% nano-alumina and 0.67% nano-silica (by cement weight), and the other concrete mix was modified with 1.33% nano-silica and 0.67% nano-titanium, where the cement was replaced by a total of 2% nano-alumina and nano-silica in two specimens, and a total of 2% nano-silica and nano-titanium in the other two specimens. One specimen from each concrete mix was subjected to a temperature of 720 °C for 2 h. The joint specimens were subjected to lateral cyclic loading on the beam and axial loading on the column. Test results showed that the replacement of cement with 2% nano-alumina and nano-silica or 2% nano-silica and nano-titanium is recommended to enhance RC joints’ behavior. The nanomaterials changed the mode of failure of the joint specimens from brittle joint shear failure to a combined type of failure involving the ductile beam hinge and joint shear.

Suggested Citation

  • Yasmin Zuhair Murad & Ahmad J. Aljaafreh & Ayoub AlMashaqbeh & Qusai T. Alfaouri, 2022. "Cyclic Behaviour of Heat-Damaged Beam−Column Joints Modified with Nano-Silica, Nano-Titanium, and Nano-Alumina," Sustainability, MDPI, vol. 14(17), pages 1-24, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:17:p:10916-:d:904035
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    Cited by:

    1. Yasmin Zuhair Murad & Hanady Al-Mahmood & Ahmad Tarawneh & Ahmad J. Aljaafreh & Ayoub AlMashaqbeh & Raghad Abdel Hadi & Rund Shabbar, 2023. "Shear Strengthening of RC Beams Using Fabric-Reinforced Cementitious Matrix, Carbon Plates, and 3D-Printed Strips," Sustainability, MDPI, vol. 15(5), pages 1-19, February.

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