Publication detail

Frequency Analysis of Mechanical Waves Passing Through Cement Composites During the Early Hydration Phase

TOPOLÁŘ, L.

Original Title

Frequency Analysis of Mechanical Waves Passing Through Cement Composites During the Early Hydration Phase

Type

lecture

Language

English

Original Abstract

From the point of view of mechanical waves, hydration of cement-based composites is an intriguing and complicated process. After mixing cement with water (suspension phase), fine crystals form as a result of ongoing chemical reactions. These crystals then interpenetrate (plastic phase) and the cement therefore gradually hardens (solid phase). All hydration phases occur in a relatively short time interval. The experiments will utilize a short impulse generated by an ultrasonic generator that will pass through the fresh mixture. When evaluating these pilot experiments, we focused on the frequency spectrum, which is sensitive to the composition of the mixture and the formation of hydration products. During the experiments, two wa-ter/cement ratios for the cement pastes (0.33 and 0.40) were used. Measurement of the internal temperature of the setting mixture was used as a supplementary indicator of cement hydration.

Keywords

non-destructive methods; pulse-echo method; mechanical waves; composite materials; early phase of hydration;

Authors

TOPOLÁŘ, L.

Released

18. 9. 2019

Publisher

ASNT event

Location

15th International Symposium on Nondestrutive Characterization of Materials, Portorož, Slovenia

BibTex

@misc{BUT159903,
  author="Libor {Topolář}",
  title="Frequency Analysis of Mechanical Waves Passing Through Cement Composites During the Early Hydration Phase",
  year="2019",
  publisher="ASNT event",
  address="15th International Symposium on Nondestrutive Characterization of Materials, Portorož, Slovenia",
  note="lecture"
}