Detail publikace

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

TOPOLÁŘ, L. KOCÁB, D. PAZDERA, L. VYMAZAL, T.

Originální název

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

This manuscript deals with a complex analysis of acoustic emission signals that were recorded during freeze-thaw cycles in test specimens produced from air-entrained concrete. An assessment of the resistance of concrete to the effects of freezing and thawing was conducted on the basis of a signal analysis. Since the experiment simulated testing of concrete in a structure, a concrete block with the height of 2.4 m and width of 1.8 m was produced to represent a real structure. When the age of the concrete was two months, samples were obtained from the block by core drilling and were subsequently used to produce test specimens. Testing of freeze-thaw resistance of concrete employed both destructive and non-destructive methods including the measurement of acoustic emission, which took place directly during the freeze-thaw cycles. The recorded acoustic emission signals were then meticulously analysed. The aim of the conducted experiments was to verify whether measurement using the acoustic emission method during Freeze-thaw (F-T) cycles are more sensitive to the degree of damage of concrete than the more commonly employed construction testing methods. The results clearly demonstrate that the acoustic emission method can reveal changes (e.g., minor cracks) in the internal structure of concrete, unlike other commonly used methods. The analysis of the acoustic emission signals using a fast Fourier transform revealed a significant shift of the dominant frequency towards lower values when the concrete was subjected to freeze-thaw cycling.

Klíčová slova

acoustic emission method; freeze-thaw cycles; concrete; signal analysis; short-time Fourier transform; fast Fourier transform

Autoři

TOPOLÁŘ, L.; KOCÁB, D.; PAZDERA, L.; VYMAZAL, T.

Vydáno

5. 3. 2021

Nakladatel

MDPI

Místo

Basel, Switzerland

ISSN

1996-1944

Periodikum

Materials

Ročník

14

Číslo

5

Stát

Švýcarská konfederace

Strany od

1

Strany do

16

Strany počet

16

URL

https://www.mdpi.com/1996-1944/14/5/1230

Plný text v Digitální knihovně

http://hdl.handle.net/11012/196747

BibTex

@article{BUT170386,
  author="Libor {Topolář} and Dalibor {Kocáb} and Luboš {Pazdera} and Tomáš {Vymazal}",
  title="Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete",
  journal="Materials",
  year="2021",
  volume="14",
  number="5",
  pages="1--16",
  doi="10.3390/ma14051230",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/14/5/1230"
}