Publication detail

Thermally loaded concrete specimens: fractal dimensions of fracture surface and mechanical fracture parameters

ROZSYPALOVÁ, I. TRČKA, T. FRANTÍK, P. ŠIMONOVÁ, H. SVOBODOVÁ, B. DANĚK, P. KERŠNER, Z.

Original Title

Thermally loaded concrete specimens: fractal dimensions of fracture surface and mechanical fracture parameters

Type

book chapter

Language

English

Original Abstract

The chapter deals primarily with the fractal dimension of fracture surfaces of fractured concrete specimens after temperature loading. These specimens were obtained from experimental concrete panels after extensive fire experiments. The maximum temperatures in the furnace, to which the panels were exposed from one side, were nominally 550, 600, 800 and 1000 °C. The reference specimens without temperature load were also tested. Specimens of nominal dimensions 100 × 100 × 400 mm with central edge notch 33 mm were tested in a three-point bending configuration; load versus displacement diagrams were recorded, corrected and evaluated. Each set contained 4 specimens, a total of 20 specimens were processed. The basic mechanical fracture parameters were assessed: modulus of elasticity, effective fracture toughness, and specific fracture energy. Fracture surfaces (ligaments) of all tested specimens after above mentioned three-point bending tests were analyzed in detail. Ligaments were scanned via 2D laser profilometer and the fractal dimension of selected sections of these surfaces was measured. Estimation of the fractal dimension of the fracture surface sections was performed using the walking divider method. Finally, the chapter presents the correlation among the fractal dimensions, the temperatures of concrete in different distance from the heated side and the previously obtained and above-mentioned mechanical fracture parameters.

Keywords

concrete, high-temperature, testing, material properties, fractals

Authors

ROZSYPALOVÁ, I.; TRČKA, T.; FRANTÍK, P.; ŠIMONOVÁ, H.; SVOBODOVÁ, B.; DANĚK, P.; KERŠNER, Z.

Released

6. 5. 2020

Publisher

Koszalin University of Technology Publishing House

Location

Koszalin

ISBN

978-83-7365-525-6

Book

Research and Modelling in Civil Engineering 2019

Pages from

7

Pages to

30

Pages count

24

URL

http://www.cecem.eu/publications/monograph_research_and_modelling_in_civil_engineering_2019.pdf

BibTex

@inbook{BUT163936,
  author="Iva {Čairović} and Tomáš {Trčka} and Petr {Frantík} and Hana {Šimonová} and Barbora {Svobodová} and Petr {Daněk} and Zbyněk {Keršner}",
  title="Thermally loaded concrete specimens: fractal dimensions of fracture surface and mechanical fracture parameters",
  booktitle="Research and Modelling in Civil Engineering 2019",
  year="2020",
  publisher="Koszalin University of Technology Publishing House",
  address="Koszalin",
  pages="7--30",
  isbn="978-83-7365-525-6",
  url="http://www.cecem.eu/publications/monograph_research_and_modelling_in_civil_engineering_2019.pdf"
}