Manufacturing Technology 2023, 23(6):819-826 | DOI: 10.21062/mft.2023.106

Methodology of Analysis of Fibre Sedimentation in HPC mixtures

Dita Jiroutová ORCID...1, Tomáš Bittner ORCID...1, Karel Hurtig ORCID...1, Tomáš Jirout ORCID...2
1 Klokner Institute, Czech Technical University in Prague. Šolínova 7, 166 08 Prague 6. Czech Republic
2 Faculty of Mechanical Engineering, Czech Technical University in Prague. Technická 4, 166 07 Prague 6. Czech Republic

The aim of this work is to propose a methodology for evaluating inhomogeneity due to the sedimenta-tion of fibres in High-Performnce Concrete (HPC) mixtures. HPC mixtures makes better mechanical-physical properties than ordinary concrete. To achieve higher strengths, the fine-grained matrix is rein-forced with the reinforcement – fibres. The type of used fibres and their homogenization in mixture has an influence on the final mechanical properties of HPC mixture. Four concrete mixtures with same com-ponent proportion was chosen for experiments. Water was the only one component, that was changing in mixture recipes. Steel fibres with a ratio of the diameter to length = 0.3/20 were used as reinforcement. The fibre volume in mixture was 1.5 %. The microscopy analysis was used for evaluation of the fibre dis-tribution in the test specimens. It was obtained, that the concentration of the fibres increases with dis-tance from the surface to the bottom of the HPC structure and this non-homogeneity increases with higher water dosage. The dependence of sedimentation of fibres on composition of HPC mixtures can be used for evaluation and optimization of final mechanical properties of the HPC structures.

Keywords: HPC mixtures, Steel fibres, Sedimentation, Fibres distribution
Grants and funding:

This work has been supported by a research project of the Grant Agency of Czech Republic No. 21-24070S Model of fibre segregation in dependence on rheological properties of fresh HPC

Received: September 22, 2023; Revised: December 10, 2023; Accepted: December 14, 2023; Prepublished online: December 14, 2023; Published: December 22, 2023  Show citation

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Jiroutová D, Bittner T, Hurtig K, Jirout T. Methodology of Analysis of Fibre Sedimentation in HPC mixtures. Manufacturing Technology. 2023;23(6):819-826. doi: 10.21062/mft.2023.106.
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