Hybrid-fibre-reinforced concrete containing multi-wall carbon nanotubes

Abstract

This paper presents a hybrid-fibre-reinforced concrete containing different amounts of steel fibres, nanosilica and multi-wall carbon nanotubes. A combination of fibres in different sizes was considered for bridging and closure of cracks in different stages of the crack growth and improving post-fracture behaviour. Moreover, pozzolanic materials such as nanosilica with high surface energy were employed for increasing the strength of the transition zone. First, investigations were carried out to achieve an optimum mix design and evaluate strength properties and energy absorption capability. Second, impact tests with two types of projectiles were conducted on slab specimens of different sizes and types. In conclusion, the addition of nanoparticles and combination of fibres led to a significant increase in toughness and impact strength.