Effect of basalt fibre on the mechanical properties of M70 grade high performance concrete

V Ram Singh,T Srikanth,S Shrihari,V Srinivasa Reddy,S Tummala,P Bobba,S Singh,S Kosaraju

doi:10.1051/e3sconf/202018401110

Abstract

The presented work reveals the strength properties of M70 grade high performance basalt fibre reinforced concrete (BFRCC) containing 0.2%, 0.3% and 0.4% basalt fibre content by volume of concrete. 10% Silica fume is admixed for attaining higher strengths as preferred. Compressive, split-tensile and flexural strengths are evaluated. The BFRCC microstructure is found to be improved due to enrichment of interfacial transition zone with chopped basalt fibres. It was found that different fibre lengths require different dosages to yield maximum effect on the properties of concrete. Stress- strain responses of M70 grade BFRSCC yields improved ultimate strain and strain at peak load indicating its energy dissipation capacity at fracture.

Highlights

Development of microstructure of concrete plays a key role it’s mechanical characteristics the porosity of the concrete
Fibre volume of the concrete, the compressive and flexural strengths achieved are maximum but the split tensile strength is found to be more for fibre length of 36 mm and dosage of 0.3%
The increase in split-tensile and flexural strength of basalt fibred concrete is significant than the compressive strength

Summary

Introduction

Development of microstructure of concrete plays a key role it’s mechanical characteristics the porosity of the concrete. Fibres in concrete is a very popular way a enhancing few properties of concrete. Use of naturally obtained basalt fibres in imparting greater delamination resistance, fracture energy absorption capability, toughness against fracture and the improved ductility endorsed to be used extensively in concrete. The popular problems associated with fibres such as segregation, dispersion, loss of shape, stiffness and cost involved are reduced by the use of basalt fibres. Research showed that not more than 0.5% of fibre volume fraction is required to be used. This low volume fibre content reduces shrinkage cracks especially in concrete elements with more exposed surface area such as pavements, slabs etc. In case of use in structural applications its content can be in the range of 1- 2% to attain the strain hardening in concrete

Strength investigations

Findings

Conclusions