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Study on the Compressive Behaviour of Sustainable Cement-Based Composites under One-Hour of Direct Flame Exposure

Author

Listed:
  • Ajitanshu Vedrtnam

    (Department of Mechanical Engineering, Invertis University, Bareilly 243123, India
    Departamento de Arquitectura, Universidad de Alcalá, 28801 Madrid, Spain)

  • Chiara Bedon

    (Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy)

  • Gonzalo Barluenga

    (Departamento de Arquitectura, Universidad de Alcalá, 28801 Madrid, Spain)

Abstract

Fire is a significant threat to human life and civil infrastructures. Builders and architects are hankering for safer and sustainable alternatives of concrete that do not compromise with their design intent or fire safety requirements. The aim of the present work is to improve the residual compressive performance of concrete in post-fire exposure by incorporating by-products from urban residues. Based on sustainability and circular economy motivations, the attention is focused on rubber tire fly ash, aged brick powder, and plastic (PET) bottle residuals used as partial sand replacement. The selected by-products from urban residues are used for the preparation of Cement-Based Composites (CBCs) in two different proportions (10% and 15%). Thermal CBC behaviour is thus investigated under realistic fire scenarios (i.e., Direct Flame (DF) for 1 h), by following the International Organization for Standardization (ISO) 834 standard provisions, but necessarily resulting in nonuniform thermal exposure for the cubic specimens. The actual thermal exposure is further explored with a Finite Element (FE) model, giving evidence of thermal boundaries effects. The post-fire residual compressive strength of heated concrete and CBC samples is hence experimentally derived, and compared to unheated specimens in ambient conditions. From the experimental study, the enhanced post-fire performance of CBCs with PET bottle residual is generally found superior to other CBCs or concrete. The structure–property relation is also established, with the support of Scanning Electron Microscopy (SEM) micrographs. Based on existing empirical models of literature for the prediction of the compressive or residual compressive strength of standard concrete, newly developed empirical relations for both concrete and CBCs are assessed.

Suggested Citation

  • Ajitanshu Vedrtnam & Chiara Bedon & Gonzalo Barluenga, 2020. "Study on the Compressive Behaviour of Sustainable Cement-Based Composites under One-Hour of Direct Flame Exposure," Sustainability, MDPI, vol. 12(24), pages 1-21, December.
  • Handle: RePEc:gam:jsusta:v:12:y:2020:i:24:p:10548-:d:463417
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    Citations

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    Cited by:

    1. Ana María Bravo-German & Iván Daniel Bravo-Gómez & Jaime A. Mesa & Aníbal Maury-Ramírez, 2021. "Mechanical Properties of Concrete Using Recycled Aggregates Obtained from Old Paving Stones," Sustainability, MDPI, vol. 13(6), pages 1-17, March.
    2. Iman Faridmehr & Chiara Bedon & Ghasan Fahim Huseien & Mehdi Nikoo & Mohammad Hajmohammadian Baghban, 2021. "Assessment of Mechanical Properties and Structural Morphology of Alkali-Activated Mortars with Industrial Waste Materials," Sustainability, MDPI, vol. 13(4), pages 1-25, February.

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