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Long-term monitoring of a hybrid SFRC slab on grade using recycled tyre steel fibres

  • Baricevic, Ana (Faculty of Civil Engineering, University of Zagreb) ;
  • Grubor, Martina (Faculty of Civil Engineering, University of Zagreb) ;
  • Paar, Rinaldo (Faculty of Geodesy, University of Zagreb) ;
  • Papastergiou, Panos (Department of Civil and Structural Engineering, The University of Sheffield) ;
  • Pilakoutas, Kypros (Department of Civil and Structural Engineering, The University of Sheffield) ;
  • Guadagnini, Maurizio (Department of Civil and Structural Engineering, The University of Sheffield)
  • Received : 2020.04.23
  • Accepted : 2020.11.13
  • Published : 2020.12.25
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Abstract

This paper presents one of the demonstration projects undertaken during the FP7 EU-funded Anagennisi project (Innovative reuse of all tyre components in concrete-2014-2017) on a full-scale (30 m×40 m, thickness: 0.2 m) Steel Fibre Reinforced Concrete (SFRC) slab-on-grade using a blend of manufactured steel fibres (MSF) and Recycled Tyre Steel Fibres (RTSF). The aim of the project was to assess the use of RTSF in everyday construction practice. The Anagennisi partners, Dulex Ltd in collaboration with Gradmont-Gradacac Ltd and University of Zagreb, designed, cast and monitored the long-term shrinkage deformations of the indoor slab-on-grade slab at Gradmont's precast concrete factory in Gradacac, Bosnia and Herzegovina. A hybrid RTSF mix (20 kg/㎥ of MSF+10 kg/㎥ of RTSF) was used to comply with the design criteria which included a maximum load capacity of 20 kN/㎡. The slab was monitored for one year using surveying equipment and visual inspection of cracks. During the monitoring period, the slab exhibited reasonable deformations (a maximum displacement of 3.3 mm for both, horizontal and vertical displacements) whilst after five years in use, the owners did not report any issues and were satisfied with the construction methodology and materials used. This work confirms that RSTF is a viable and sustainable solution for slab-on-grade applications.

Keywords

Acknowledgement

The research presented is part of the 7th Framework Programme "Anagennisi-Innovative Reuse of all Tyre Components in Concrete" project funded by the European Commission. Authors would like to thank the Anagennisi partners who worked in this demonstration project: Dulex Ltd, Gradmont Ltd and Twincon Ltd for their support and contribution during the demonstration and experimental work. This project was supported by the Royal Academy of Engineering under the Research Chairs and Senior Research Fellowships scheme.

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