Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Study on the Compressive Behaviour of Sustainable Cement-Based Composites Under 1-Hour Direct Flame Exposure

Version 1 : Received: 6 October 2020 / Approved: 7 October 2020 / Online: 7 October 2020 (09:27:18 CEST)

How to cite: Vedrtnam, A.; Bedon, C.; Barluenga, G. Study on the Compressive Behaviour of Sustainable Cement-Based Composites Under 1-Hour Direct Flame Exposure. Preprints 2020, 2020100153 (doi: 10.20944/preprints202010.0153.v1). Vedrtnam, A.; Bedon, C.; Barluenga, G. Study on the Compressive Behaviour of Sustainable Cement-Based Composites Under 1-Hour Direct Flame Exposure. Preprints 2020, 2020100153 (doi: 10.20944/preprints202010.0153.v1).

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 the 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 %). The thermal CBC behaviour is thus investigated under realistic fire scenarios (i.e., Direct Flame (DF) for 1 hour (1h)), by following the ISO 834 standard provisions, but necessarily resulting in non-uniform 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.

Subject Areas

Concrete; Cement-Based Composites (CBCs); compressive strength; fire exposure; thermal boundaries; Finite Element (FE) numerical modelling; empirical formulations.

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