Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Zhenrong Liu; Huaxin Liu; Weixing Xu; Beibei Liu; Yue Zhong; Jian Geng; Genjin Liu

doi:10.3989/mc.2024.361123

Autores/as

Zhenrong Liu Liaoning University of Technology https://orcid.org/0009-0004-5947-8030
Huaxin Liu College of Civil and Architectural Engineering, Liaoning University of Technology, https://orcid.org/0000-0003-1012-3963
Weixing Xu School of Architecture, Tianjin University https://orcid.org/0000-0002-5180-8814
Beibei Liu School of Architecture, Tianjin University https://orcid.org/0009-0007-1955-415X
Yue Zhong Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University https://orcid.org/0000-0002-3355-7097
Jian Geng School of Civil Engineering, NingboTech University https://orcid.org/0000-0003-0484-2371
Genjin Liu School of Civil Engineering, NingboTech University https://orcid.org/0000-0002-5128-9874

DOI:

https://doi.org/10.3989/mc.2024.361123

Palabras clave:

Alta temperatura, Barra de PRFB, Hormigón reforzado con fibra híbrida, Morfología microscópica, Propiedades adhesivas

Resumen

Esta investigación evaluó las propiedades de adherencia a altas temperaturas y con adición de fibra híbrida entre barras de polímero reforzado con fibra de basalto (BFRP) y hormigón reforzado con fibra híbrida (HFRC). Se analizaron la resistencia a la tracción y la morfología del aspecto de las barras de BFRP. Se utilizó microscopía electrónica de barrido (SEM) para examinar la morfología microscópica y se utilizó el modelo constitutivo de adherencia-deslizamiento para ajustar las curvas de adherencia-deslizamiento. Cuando las barras de BFRP se expusieron a 300 °C, su resistencia a la tracción disminuyó un 42%. Con el aumento de la temperatura, la resistencia de adherencia y la rigidez de los especímenes de hormigón normal (NC) disminuyeron un 27,3% y un 67,5%, respectivamente, mientras que los especímenes HFRC disminuyeron un 20,8% y un 55%, respectivamente. Las fibras híbridas aumentaron la resistencia de adherencia y la rigidez de las probetas HFRC en un 27,1 % y un 49,1 %, respectivamente. Los modelos que mejor se ajustaron fueron el modelo de Malvar y el modelo de curva continua.

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Citas

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