Benefits of using amorphous metallic fibres in concrete slabs-on-grade

  • Sunitha K Nayar Indian Institute of Technology (IIT) Madras
  • Ravindra Gettu Building Technology and Construction Management Division, Indian Institute of Technology (IIT) Madras
Keywords: Fibre reinforced concrete (FRC), Slabs-on-grade, Inelastic analysis, Flexural toughness

Abstract

The effective utilization of pseudo-ductile materials like Fibre Reinforced Concrete (FRC) depends on the incorporation of suitable material parameters in appropriate design approaches. A design methodology has been developed for slabs-on-grade addressing various failure patterns, and giving a performance requirement as the design output. This opens up the choice of fibres, allowing the use of combinations of fibres to suit the service requirements. In this context, the current study explores the use of hybrid combinations of conventional steel fibres (SF) and a genre of corrosion-resistant amorphous metallic fibres (AMF) that have the ability to significantly enhance the flexural strength of concrete, even at relatively low dosages. It is shown that AMF, when used in combination with SF, results in a synergistic response with respect to toughness; mixes with 15 kg/m3 of SF and 20 kg/m3 of AMF exhibit about 50% higher characteristic flexural strength and more than double the characteristic equivalent flexural strength than the mix with 15 kg/m3 of SF alone, in the concrete considered here. Consequently, when FRC with a hybrid combination of fibres (AMF+SF) was considered in design, a significant reduction in thickness of slab was possible, in comparison to FRC with only SF.

Author Biographies

Sunitha K Nayar, Indian Institute of Technology (IIT) Madras

Scientist

Department of Civil Engineering

Ravindra Gettu, Building Technology and Construction Management Division, Indian Institute of Technology (IIT) Madras

Professor

Department of Civil Engineering

Published
2016-12-31
How to Cite
Nayar, S. K. and Gettu, R. (2016) “Benefits of using amorphous metallic fibres in concrete slabs-on-grade”, RILEM Technical Letters, 10, pp. 122-128. doi: 10.21809/rilemtechlett.2016.20.
Section
Articles