Loading...

Strength of SCLC recycled springs and fibers concrete subject to high temperatures

Pachideh, G ; Sharif University of Technology | 2022

28 Viewed
  1. Type of Document: Article
  2. DOI: 10.1002/suco.202100183
  3. Publisher: John Wiley and Sons Inc , 2022
  4. Abstract:
  5. In this article, the self-compacting lightweight concretes (SCLC) with different fibers were prepared and exposed to elevated temperatures, and their mechanical properties were investigated. Three types of fibers were steel fibers (SF), polypropylene fibers (PPF), and metal springs with a volume fraction of 0.4%. One hundred and fifty cylindrical specimens were prepared, and the compression, tensile and flexural tests were carried out on them after exposure to high temperatures ranging from 25 to 700°C. The findings indicate that incorporation of steel fibers and springs enhanced the compressive strength of concrete by 20% compared to the control specimen. Meanwhile, the polypropylene fibers increased the tensile strength up to 70% after exposure to the elevated temperatures. The flexural strength of concrete in all specimens was dramatically reduced at the temperature of 700°C. Following an increase in temperature, the bending-induced strain energy in the specimens containing steel fibers and metal spring increased by 70% and 88% in contrast to the control specimen. Conversely, the strain energy of the specimens containing polypropylene reduced by 70%. For all concrete mixes, the threshold temperature for severe strength loss in the compressive, tensile, and flexural strength tests was 500°C, and the strengths of concrete specimens decreased remarkably at the temperature of 700°C. Finally, the use of metal springs could relatively enhance the mechanical properties of SCLC and reduce the cost. © 2021 fib. International Federation for Structural Concrete
  6. Keywords:
  7. High temperatures ; Mechanical properties ; Recycled spring ; Self-compacting lightweight concrete ; Steel fiber ; Bending strength ; Compressive strength ; Light weight concrete ; Polypropylenes ; Self compacting concrete ; Springs (components) ; Strain energy ; Tensile strength ; Compressive strength of concrete ; Cylindrical specimens ; Elevated temperature ; Polypropylene fiber ; Polypropylene fiber(PPF) ; Self-compacting lightweight concretes ; Strength of concrete ; Threshold temperatures ; Steel fibers
  8. Source: Structural Concrete ; Volume 23, Issue 1 , 2022 , Pages 285-299 ; 14644177 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/suco.202100183