Publication detail

Fracture Parameters of Alkali-activated Aluminosilicate Composites with Ceramic Precursor

ŠIMONOVÁ, H. KUMPOVÁ, I. ROZSYPALOVÁ, I. BAYER, P. FRANTÍK, P. ROVNANÍKOVÁ, P. KERŠNER, Z.

Original Title

Fracture Parameters of Alkali-activated Aluminosilicate Composites with Ceramic Precursor

Type

conference paper

Language

English

Original Abstract

This paper deals with selected alkali-activated aluminosilicate composites with a ceramic precursor in terms of their characterization using mechanical fracture parameters. Three composites were studied. They were manufactured using brick powder as a precursor and an alkaline activator with a dimensionless silicate modulus of Ms = 1.0, 1.2 and 1.4. The test specimens were nominally 40 × 40 × 160 mm in size and had a central edge notch with a depth of 1/3 of the specimen’s height. At least 6 specimens made of each composite were tested at the age of 28 days. The specimens were subjected to three-point bending tests, during which diagrams showing force vs. deflection at midspan (F–d diagrams) and force vs. crack mouth opening displacement (F–CMOD diagrams) were recorded. After the processing of these diagrams, values were determined for the static modulus of elasticity, effective fracture toughness (including its initiation component from the analysis of the first part of the F–CMOD diagrams), effective toughness and specific fracture energy using the effective crack model, Work-of-Fracture method, and Double-K fracture model. After the fracture experiments had been performed, compressive strength values were determined for informational purposes from one part of each specimen that remained after testing. In order to obtain visual information about the internal structure of the composites before and after the mechanical testing, the selected specimen was examined via X-ray microtomography. Tomographic measurements and image processing were performed for the qualitative and quantitative evaluation of internal structural changes with an emphasis on the calculation of porosimetry parameters as well as the visualization of the fracture process zone. The fractal dimension of the fracture surface and fracture process zone was determined. The porosity and microstructure images of selected samples taken from specimens were assessed.

Keywords

Alkali-activated aluminosilicate, ceramic precursor, fracture test, load–displacement diagram, porosity.

Authors

ŠIMONOVÁ, H.; KUMPOVÁ, I.; ROZSYPALOVÁ, I.; BAYER, P.; FRANTÍK, P.; ROVNANÍKOVÁ, P.; KERŠNER, Z.

Released

11. 8. 2020

Publisher

Trans Tech Publications Ltd, Switzerland

Location

Switzerland

ISBN

978-3-0357-1668-9

Book

26th Concrete Days

Edition number

309

ISBN

1662-9779

Periodical

Solid State Phenomena

Year of study

309

Number

309

State

Swiss Confederation

Pages from

73

Pages to

79

Pages count

7

URL

https://www.scientific.net/SSP.309.73

BibTex

@inproceedings{BUT164750,
  author="Hana {Šimonová} and Ivana {Kumpová} and Iva {Čairović} and Patrik {Bayer} and Petr {Frantík} and Pavla {Rovnaníková} and Zbyněk {Keršner}",
  title="Fracture Parameters of Alkali-activated Aluminosilicate Composites with Ceramic Precursor",
  booktitle="26th Concrete Days",
  year="2020",
  journal="Solid State Phenomena",
  volume="309",
  number="309",
  pages="73--79",
  publisher="Trans Tech Publications Ltd, Switzerland",
  address="Switzerland",
  doi="10.4028/www.scientific.net/SSP.309.73",
  isbn="978-3-0357-1668-9",
  issn="1662-9779",
  url="https://www.scientific.net/SSP.309.73"
}