Monitoring the nonlinear parameters of nano-enhanced cement based structures during their curing process

I. K. Tragazikis; T. Z. Kordatou; P. T. Dalla; D. A. Exarchos; T. E. Matikas

doi:10.1117/12.2583685

22 March 2021 Monitoring the nonlinear parameters of nano-enhanced cement based structures during their curing process

I. K. Tragazikis, T. Z. Kordatou, P. T. Dalla, D. A. Exarchos, T. E. Matikas

Proceedings Volume 11591, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2021; 1159127 (2021) https://doi.org/10.1117/12.2583685
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

It is well known that the behavior and properties of construction materials largely rely on the characteristics of their internal microstructure. It is important the curing process in freshly poured cementitious materials to be understood to successfully carry out every stage of construction development. Shortly after the mixing procedure, at the state when the suspension transmutes from the liquid to the solid-state phase, the ultrasonic wave propagation and the low pulse velocity of cement-based materials exhibit simultaneously a significant decrease. This is followed by an increase in both the ultrasonic pulse velocity and the signal amplitude. The point of solidification is responsible for the load-bearing capacity of the cement composite and its long-term behavior. At the point of phase change which occurs during curing, the nonlinear behavior of the material exhibits a notable sensitivity. This work aims at the comparison between nano-enhanced and plain cement-based composites regarding their hydration process. Multi-walled carbon nanotubes (MWCNTs) have been used as nano-enhancement in the cement paste specimens. The MWCNTs were synthesized via catalytic chemical vapor deposition, while a water-based superplasticizer was selected as the dispersion agent. The early stages of freshly poured materials were monitored using nonlinear elastic waves. A contact ultrasonic transducer and a noncontact optical detection device (Laser Doppler Vibrometer) were used for the experimental measurements. This method assesses the amplitudes of harmonic vibrations of an elastic wave with a specific fundamental frequency, propagating through the material, leading to the evaluation of its internal structure.

Citation Download Citation

I. K. Tragazikis, T. Z. Kordatou, P. T. Dalla, D. A. Exarchos, and T. E. Matikas "Monitoring the nonlinear parameters of nano-enhanced cement based structures during their curing process", Proc. SPIE 11591, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2021, 1159127 (22 March 2021); https://doi.org/10.1117/12.2583685

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KEYWORDS

Cements

Ultrasonics

Composites

Laser optics

Wave propagation

Doppler effect

Liquids

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