Publication detail

Fracture parameters of alkali-activated aluminosilicate composites with ceramic precursor: durability aspects

ŠIMONOVÁ, H. LIPOWCZAN, M. ROZSYPALOVÁ, I. DANĚK, P. LEHKÝ, D. ROVNANÍKOVÁ, P. KERŠNER, Z.

Original Title

Fracture parameters of alkali-activated aluminosilicate composites with ceramic precursor: durability aspects

Type

conference paper

Language

English

Original Abstract

Four sets of alkali-activated aluminosilicate (AAAS) composites based on ceramic precursors were studied in terms of their characterization by mechanical fracture parameters as a basis for considerations of durability. AAAS composites made of brick powder as a precursor and alkaline activator with various silicate moduli (Ms = 0.8, 1.0, 1.2, 1.4, and 1.6) were investigated. The sets of AAAS composites differed in terms of the used filler: quartz sand or brick rubble. Two different precursor particle size ranges of 0–1 mm and 0–0.3 mm were used for both types of filler. The test specimens had nominal dimensions of 40 × 40 × 160 mm and were provided with a notch at midspan after 28 days of hardening. The notches were cut up to 1/3 of the height of the specimens. The specimens were subjected to three-point bending fracture tests during which force vs. deflection (F–d) and force vs. crack mouth opening displacement (F–CMOD) diagrams were recorded. Tensile strength ft,ID and specific fracture energy GF,ID values were identified using the inverse method based on a neural network ensemble. The obtained F–CMOD diagrams were subsequently evaluated using the double-K fracture model supported by the ft,ID and GF,ID values. The double-K model allows the quantification of two different levels of crack propagation: initiation, which corresponds to the beginning of stable crack growth, and unstable crack propagation.

Keywords

Alkali-activated aluminosilicate; artificial neural network; neural network ensemble; crack initiation; double-K model; fracture test; force–displacement diagram; mechanical fracture parameters.

Authors

ŠIMONOVÁ, H.; LIPOWCZAN, M.; ROZSYPALOVÁ, I.; DANĚK, P.; LEHKÝ, D.; ROVNANÍKOVÁ, P.; KERŠNER, Z.

Released

20. 11. 2021

Publisher

Elsevier

ISBN

2452-3216

Periodical

Procedia Structural Integrity

Year of study

33

State

Republic of Italy

Pages from

207

Pages to

214

Pages count

8

URL

https://www.sciencedirect.com/science/article/pii/S2452321621001207

Full text in the Digital Library

http://hdl.handle.net/11012/203090

BibTex

@inproceedings{BUT173315,
  author="Hana {Šimonová} and Martin {Lipowczan} and Iva {Čairović} and Petr {Daněk} and David {Lehký} and Pavla {Rovnaníková} and Zbyněk {Keršner}",
  title="Fracture parameters of alkali-activated aluminosilicate composites with ceramic precursor: durability aspects",
  booktitle="Procedia Structural Integrity
26th International Conference on Fracture and Structural Integrity",
  year="2021",
  journal="Procedia Structural Integrity",
  volume="33",
  pages="207--214",
  publisher="Elsevier",
  doi="10.1016/j.prostr.2021.10.025",
  issn="2452-3216",
  url="https://www.sciencedirect.com/science/article/pii/S2452321621001207"
}