Generalization of the Barcelona test for the toughness control of FRC

Through different researches and application in works, the Barcelona test has proven to be adequate for toughness control of fiber reinforced concrete (FRC) and has recently been standardized in Spain (UNE 83515-2010). However, to determine FRC toughness an extensometer is required for measuring the circumferential displacement of the specimen in the post-cracking regime. In order to generalize the use of this test, this paper shows the results of an extensive experimental campaign in which circumferential and axial displacements of specimens were measured during tests. Results show a linear correlation between these displacements in a wide range of post-cracking regime, with a scatter lower than bending tests, commonly used to quantify FRC toughness. These results allow to use axial displacement measurement in place of the circumferential displacement. Additionally, the axial displacement it related with the piston stroke reaching highly successful results.

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