APPLICATION OF STEEL FIBRES IN ALKALI-ACTIVATED MORTARS

Authors

  • Götz Hüsken Federal Institute for Materials Research and Testing (BAM), Department of Safety of Structures (Dpt.7), Unter den Eichen 87, 12205 Berlin, Germany
  • Lars-Christian Wagner Federal Institute for Materials Research and Testing (BAM), Department of Safety of Structures (Dpt.7), Unter den Eichen 87, 12205 Berlin, Germany Technische Universität Berlin, Group of Building Materials and Construction Chemistry, Gustav-Meyer-Allee 25, 13355 Berlin, Germany
  • Gregor J. G. Gluth Federal Institute for Materials Research and Testing (BAM), Department of Safety of Structures (Dpt.7), Unter den Eichen 87, 12205 Berlin, Germany
  • Stephan Pirskawetz Federal Institute for Materials Research and Testing (BAM), Department of Safety of Structures (Dpt.7), Unter den Eichen 87, 12205 Berlin, Germany
  • Hans-Carsten Kühne Federal Institute for Materials Research and Testing (BAM), Department of Safety of Structures (Dpt.7), Unter den Eichen 87, 12205 Berlin, Germany

DOI:

https://doi.org/10.14311/APP.2020.27.0090

Keywords:

Alkali-activated materials, fibre pull-out, steel fibres, tensile strength

Abstract

Alkali-activated materials are ideal for the repair of concrete structures in harsh environmental conditions due to their high durability in chemically aggressive environments. However, slag-based mortars, in particular, are prone to shrinkage and associated cracks. In this respect, the application of steel fibres is one solution to reduce the formation of shrinkage induced cracks and to improve post cracking behaviour of these mortars. This study investigated the influence of two different types of steel fibres on the tensile properties of two alkali-activated mortars. Direct tensile tests and single fibre pull-outs were performed to analyse the determining failure modes both on macro and micro scale. Mechanical testing was accompanied by non-destructive testing methods such as digital image correlation and acoustic emission for a detailed analysis of the fracture process.

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Published

2020-06-11

Issue

Vol. 27 (2020): Proceedings of the 14th International Conference on Local Mechanical Properties - LMP 2019

Section

Articles

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