Magnetic probe to test spatial distribution of steel fibres in uhpfrc prisms

Lufan Li, Jun Xia, Isaac Galobardes

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


The mechanical properties of ultra-high performance fibre reinforce concrete (UHPFRC) vary owing to the different distribution of fibres within the mix. By taking advantage of the magnetic properties of steel fibres, a non-destructive method (NDT) based on a magnetic probe was investigated. The probe was built to measure not only a 2D but also a 3D spatial distribution. The experimental program was mainly carried on vibrated and non-vibrated prisms. In that sense, the effective depth of the probe was determined first. The inductance data revealed the distribution of fibres in different prism sections. The results showed how vibrated prisms presented a better performance in flexural strength test. To validate the method, slices were cut from the concrete prisms and an image analysis was conducted based on photos taken of the cross sections. The sedimentation of fibres inside concrete due to external vibration was verified and related to the mechanical performance. Due to the convenience of this method, it is highly expected it could be applied in field for material quality control or in lab for material characterization.

Original languageEnglish
Pages (from-to)954-962
Number of pages9
Journalfib Symposium
Publication statusPublished - 2018
EventInternational fib Congress on Better, Smarter, Stronger, 2018 - Melbourne, Australia
Duration: 7 Oct 201811 Oct 2018


  • Distribution of steel fibres
  • Four-point bending test
  • Image processing
  • Magnetic probe inductance detection
  • Steel fibre concrete


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