Impact response of different classes of fibre reinforced concrete

VIVAS, J.C.; ZERBINO, R.; TORRIJOS, M.C.; GIACCIO, G.

Fibre Reinforced Concrete: Improvements and Innovations.

Springer

Año: 2021; p. 189 - 198

The use of fibre reinforced concrete in structural elements exposed toimpacts or different types of extreme loading represents one of the main fields ofapplication of this high-performance material. Nevertheless, there is not ageneral consensus about a test for impact characterization of fibre concretes and,specifically a procedure to evaluate the contribution of fibres after cracking. It iswell known that fibres control the evolution of cracks, improving the durabilityof concrete elements. Nowadays there are many structural fibres available; oneof the greatest advantages to enhance the use of different fibres is the introduction of FRC classes in the fib Model Code 2010. However, there are notreferences about the relationship between the residual capacity measured instatic tests (i.e. EN 14651) and the impact response. A drop weight impact testmethod is proposed to evaluate the contribution of different fibres consideringboth the cracking resistance and the behaviour in cracked state. Results of FRCbelonging to different classes, incorporating different contents of steel, glass andpolymer macrofibres are presented and compared. The effect of the residualcapacity measured on standard bending tests on the impact resistance isdiscussed