Sprayed, steel fibre reinforced concrete (SSFRC) is a material that tends to present anisotropy. The shearing conditions of the spraying process induce preferential fibre orientation. Despite the extensive use of the material, no study has been found about the assessment of fibre distribution and its influence on the residual tensile strength of SSFRC. The objective of this work is to address such issue from a quantitative standpoint. An experimental program was performed with specimens extracted from different directions within a SSFRC panel. The fibre content and 3D orientation were quantified for each specimen using the inductive method. Then, the tensile behaviour was indirectly assessed for the same specimen through the Barcelona test. Results confirm the high level of anisotropy of SSFRC. The fibre orientation number parallel to the spraying direction is 3 times bigger than that found in the perpendicular direction. Similar differences were observed between the residual tensile response measured in those directions. Comparison of test results suggest that the preferential fibre orientation creates weaker planes that favours the increase of crack opening at lower load levels.
Funding
This work was supported by the Spanish Ministry of Science and Innovation through Research Project IPT F-00339 FIBHAC.
History
School
Architecture, Building and Civil Engineering
Published in
Materials and Structures
Citation
SEGURA-CASTILLO, L. ...et al., 2018. Fibre distribution and tensile response anisotropy in sprayed fibre reinforced concrete. Materials and Structures, 51 (1), Article 29.
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/
Acceptance date
2018-01-28
Publication date
2018
Notes
This is a post-peer-review, pre-copyedit version of an article published in Materials and Structures. The final authenticated version is available online at: https://doi.org/10.1617/s11527-018-1156-5