MECHANICAL PROPERTIES IMPROVEMENT OF FIBER REINFORCED CONCRETE

Authors

  • Jan Trejbal
  • Václav Nežerka
  • Radim Hlůžek
  • Zdeněk Prošek

DOI:

https://doi.org/10.14311/APP.2019.22.0123

Keywords:

fiber reinforced concrete, macro fibers, polymer fibers, interfacial shear stress

Abstract

Fiber reinforced concrete mechanical properties are limited due to low adhesion between polymer fibers and cement matrix. To ensure a strong interaction between the two materials, polypropylene fibers (d = 0.305mm) were modified by an oxygen plasma treatment. The interface interaction was moreover activated using finely ground concrete recyclate, whose individual grains (1−64 μm) ensure an adhesion improvement in interfacial zones. The adhesion enhancement was verified by pull-out tests, when reference and modified fibers were pulled-out from cement matrix specimens. Such obtained results were used as a crucial parameter to numerical simulations of bending tests of specimens (550 × 150 × 150mm) with properties following fiber reinforced concrete. It was shown that samples reinforced with modified fibers and contained activating recyclate reached on higher residual bending strength then those with reference fibers.

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Published

2019-07-25

Issue

Vol. 22 (2019): SPECIAL CONCRETE AND COMPOSITES 2018

Section

Articles

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