Shear strength of reinforced mortar beams containing polyvinyl alcohol fibre (PVA)

Shaaban, Ibrahim ORCID: https://orcid.org/0000-0003-4051-341X, Said, Mohamed, Montaser, Wael, Elgammal, Ahmed S. and Zahir, Amr H. (2021) Shear strength of reinforced mortar beams containing polyvinyl alcohol fibre (PVA). International Journal of Civil Engineering. ISSN 1735-0522

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Abstract

The current study aims to assess the shear behaviour of reinforced mortar beams including Polyvinyl Alcohol Fibre (PVA) ranges from 0 to 2.25%, fly ash (55%) and silica fume (15%). Fourteen beams were experimentally tested under two concentrated loads. In addition, a finite element model was developed to predict the crack pattern, load–deflection, energy absorption, and shear strength results of the test beams. The studied variables were different percentages of PVA fibres, shear span to depth ratio (a/d), and transverse reinforcement (stirrups) ratio. The fly ash and silica fume were kept constant in all the studied mixes to achieve a compressive strength above 55 MPa at the time of testing (90 days) and to improve PVA-mortar properties. It was found that the inclusion of PVA improves the shear behavior of the tested beams in terms of crack pattern and ductility. It was observed also that reducing a/d led to enhancing the shear capacity without changing the mode of failure. In addition, PVA played the same role as the stirrups and their effect on the ultimate shear capacity was increased with reducing the volume of stirrups. Moreover, the PVA fibres were more effective in lower shear span to depth ratio (a/d = 1.5) giving an enhancement of shear resistance of 221%. The non-linear finite element model showed excellent agreement with the experimental results and the ratio of the predicted to experimental ultimate strength ranged between 0.91 and 1.09. The authors recommend a combination of fly ash, silica fume and at least 1.5% PVA in the presence of minimum stirrups reinforcement (5U6/m) or adding 2.25% PVA without stirrups to achieve adequate shear behaviour and to improve the ductility of PVA-mortar beams.

Item Type: Article
Additional Information: This is a post-peer-review, pre-copyedit version of an article published in International Journal of Civil Engineering. The final authenticated version is available online at: https://doi.org/10.1007/s40999-021-00628-6
Uncontrolled Keywords: PVA, Mortar, Shear of beams, Fly ash, Silica fume, Non-linear finite element modeling
Subjects: Construction and engineering
Related URLs:
Depositing User: Ibrahim Shaaban
Date Deposited: 07 May 2021 10:45
Last Modified: 28 Aug 2021 07:15
URI: http://repository.uwl.ac.uk/id/eprint/7857

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