Experimental characterization of the flexural behaviour of steel fibre reinforced concrete according to RILEM TC 162-TDF

The post-cracking energy absorption capacity is the concrete property most benefited by steel fibre reinforcement, usually designated by toughness. Different test set-ups, test procedures and parameters have been proposed to evaluate the toughness of the steel fibre reinforced concrete (SFRC), but none of them has received a general acceptation by scientific and technical communities. As a consequence, designers put some reserves on the use of SFRC, because they are not confident on the design practice to be adopted, resulting in the exclusion of SFRC in applications where it could be the most suitable solution. In the last years RILEM TC 162 – TDF has published documents where recommendations for characterizing and designing SFRC structures are proposed. A general acceptation of these recommendations can be only taken if they are deeply analysed and checked by a large number of research centres. This work intends to give some contribution for this analysis. It has also the purpose of evaluating the influence of the fibre content, percentage of cement replaced by fly ash and SFRC age on the post-cracking behaviour of the SFRC, under the experimental framework recommended by RILEM TC 162 – TDF.

Joaquim Barros and Joaquim Antunes