Publication detail

Evaluation of Wedge Splitting Fracture Tests using the Double-K Model: Analysis of the Effect of Hemp Fibre Dosage and Length in Concrete Specimens.

ŠIMONOVÁ, H. HAVLÍKOVÁ, I. SOBEK, J. ABDULRAHMAN, A. KERŠNER, Z. MERTA, I.

Original Title

Evaluation of Wedge Splitting Fracture Tests using the Double-K Model: Analysis of the Effect of Hemp Fibre Dosage and Length in Concrete Specimens.

Type

conference paper

Language

English

Original Abstract

This paper presents the results obtained from the employment of a selected fracture model to evaluate wedge splitting fracture tests carried out on hemp fibre concrete specimens. The research was mainly focused on the effect of the dosage and length of hemp fibres on the initiation part of crack propagation in concrete specimens, and on critical crack opening displacement. Concrete mixtures with different volumetric dosages (0.5, 1.0 and 2.0 %) and fibre lengths (10, 20 and 40 mm) were prepared, and six identical specimens were cast from each mixture. Specimens were also cast from a reference mixture, which was without fibres. The specimens were provided with an initial notch and tested using the wedge splitting test method. Load versus crack mouth opening displacement diagrams were recorded and (after data filtering and appropriate modifications) subsequently evaluated using the Double-K fracture model. This model allows the evaluation of two material parameters – the initiation fracture toughness, which defines the onset of stable crack propagation, and the unstable fracture toughness, which defines the onset of unstable cracking or failure. Finally, the critical crack opening displacement was determined with the assumption of the bilinear function of softening in tension.

Keywords

Concrete, hemp fibre, fracture, Double-K model.

Authors

ŠIMONOVÁ, H.; HAVLÍKOVÁ, I.; SOBEK, J.; ABDULRAHMAN, A.; KERŠNER, Z.; MERTA, I.

Released

25. 4. 2016

Location

Switzerland

ISBN

978-3-03835-675-2

Book

Proceeding from 22nd Czech Concrete Day 2015

ISBN

1012-0394

Periodical

Solid State Phenomena

Number

249

State

Swiss Confederation

Pages from

142

Pages to

146

Pages count

5

BibTex

@inproceedings{BUT124280,
  author="Hana {Šimonová} and Ivana {Havlíková} and Jakub {Sobek} and Alaa {Abdulrahman} and Zbyněk {Keršner} and Ildiko {Merta}",
  title="Evaluation of Wedge Splitting Fracture Tests using the Double-K Model: Analysis of the Effect of Hemp Fibre Dosage and Length in Concrete Specimens.",
  booktitle="Proceeding from 22nd Czech Concrete Day 2015",
  year="2016",
  journal="Solid State Phenomena",
  number="249",
  pages="142--146",
  address="Switzerland",
  isbn="978-3-03835-675-2",
  issn="1012-0394"
}