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Effect of fine to coarse aggregate ratio on the rheology and fracture energy of steel fibre reinforced self-compacting concretes

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Abstract

In this study, the influence of aggregate grading and steel fibre properties on the flow properties and fracture energy of steel fibre reinforced self-compacting concrete (SFRSCC) has been investigated. Two types of hooked-end steel fibres at three different dosages (20, 40 and 60 kg/m3) were incorporated into self-compacting mixtures having similar paste contents but different fine to coarse aggregate (FA/CA) ratios (0.94, 1.72 and 2.50 by weight). Besides the flowability and passing ability of fresh concrete, the mechanical properties of hardened concrete including the fracture energy have also been investigated. The relations between flexural parameters and fibre orientation were established by image analysis technique. Test results showed that hooked-end steel fibre inclusion into the plain self-compacting concrete negatively affects the flowability and passing ability of the mixture. Increasing FA/CA ratio enhances these rheological parameters and provides better fibre orientation. On the other hand, increasing FA/CA ratio decreases the fracture energy of plain SCC mixtures and the fibre incorporated series which were less affected from fibre inclusion follow the same trend with the plain SCC. The proper FA/CA ratio for the best rheological and mechanical performance depends on the fibre content, aspect ratio and their influence on the flowability of the mixture. In order to obtain better fibre orientation and hence higher fracture energy, relatively higher FA/CA ratios should be used when the fibre content and aspect ratio are relatively high.

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Acknowledgements

The authors thank Mr İrfan Kadiroglu of Izmir Batı Beton Ready-Mixed Concrete Company for their extensive help during concrete production. Authors also thank Mr. Mehmet Yerlikaya from Bekaert-Beksa -Turkey for providing fibres used in this study. Dr. Okan Onal from Dokuz Eylul University is also thanked for his valuable suggestions on the image analysis set-up.

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Authors and Affiliations

  1. Civil Engineering Department, Gediz University, Seyrek, 35665, Izmir, Turkey

    MERT YÜCEL YARDIMCI

  2. Civil Engineering Department, Dokuz Eylül University, Buca, 35160, Izmir, Turkey

    BÜLENT BARADAN

  3. Civil Engineering Department, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey

    MEHMET ALİ TAŞDEMİR

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  1. MERT YÜCEL YARDIMCI
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  2. BÜLENT BARADAN
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Correspondence to MERT YÜCEL YARDIMCI.

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YARDIMCI, M.Y., BARADAN, B. & TAŞDEMİR, M.A. Effect of fine to coarse aggregate ratio on the rheology and fracture energy of steel fibre reinforced self-compacting concretes. Sadhana 39, 1447–1469 (2014). https://doi.org/10.1007/s12046-014-0257-2

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  • DOI: https://doi.org/10.1007/s12046-014-0257-2

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