Monitoring the Nonlinear Acoustic Behavior of Fresh Cementitious Materials during the Hardening Process Using Laser Doppler Vibrometry

Tragazikis, Ilias Κ.; Koutrakou, Alexia N.; Kordatou, Theodoti Z.; Dalla, Panagiota T.; Matikas, Theodore E.

doi:10.3390/acoustics2040047

Cited by 3 publications

(13 citation statements)

References 39 publications

(72 reference statements)

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“…As it was also observed in previous research [20,24], three stages of the cement paste hardening process occur. These three phases are quite apparent on the obtained diagram of strength as shifts in the slope of the curve.…”

Section: Resultssupporting

confidence: 83%

“…This is further expected since specimen volume and water to cement ratio are kept constant for all specimens; therefore, paste samples contain more cement compared to mortar samples, which have also aggregates. [20]. Comparing Figures 3 and 4, it is graphically proved the prior acceptance that the algorithm that ConRef-700 equipment uses does not take into consideration at the strength results the existence of the nanoinclusions.…”

mentioning

confidence: 82%

“…The hydration process leads to the concrete hardening because of its greatly exothermic behavior [19], while it occurs when dry cement interacts with water and as a result the microstructure of the hardened materials is affected. It has been observed that, during hydration, the physical properties of concrete develop depending on the critical phase change behavior that occurs in the solidification process [20].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in order to monitor the material's structural integrity, nondestructive ultrasonic characterization methods were applied to the freshly poured concrete [20]. The reflection transmission of compressional and transversal elastic waves are widely used to quantify processes, while the compressional wave velocity is extensively used as an indicator of the hardening process.…”

Section: Introductionmentioning

confidence: 99%

“…The second stage appears between 1500 m/s and 3000 m/s. The rise of ultrasonic velocity is due to a decrease in water volume and an increase of hydration products with progress of cement paste hydration [20,24,49].…”

mentioning

confidence: 99%

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Monitoring the Hydration Process in Carbon Nanotube Reinforced Cement-Based Composites Using Nonlinear Elastic Waves

Tragazikis¹,

Kordatou²,

Exarchos³

et al. 2021

Applied Sciences

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There is currently an increased need for associating construction material properties and behavior with the nature of their microstructure. One of the major issues in this context is the need for understanding the curing process in freshly poured cement-based materials. This is particularly important when nanoreinforcement materials, such as carbon nanotubes, are used to enhance the mechanical behavior and multifunctionality of the final structure. The solidification point, at which the state of liquid suspension transmutes to the solid state, is of particular interest since it greatly influences the load-bearing capacity of the cement-based material and its structural behavior at the long term. The main purpose of the present work is to develop a reliable method for monitoring the hydration process during the early stages of freshly poured cementitious composites enhanced with carbon nanotubes. This methodology is based on the use of nonlinear elastic waves. To achieve this goal, a combination of contact ultrasonics with noncontact optical detection was used. The detection method for evaluating the setting process is based on the assessment of higher-harmonic amplitudes of an ultrasonic wave, with a given frequency, propagating through the cementitious material. It was observed that the material nonlinearity changes significantly during the hardening process, compared to velocity or attenuation measurements which are based on linear acoustics. These changes were more noticeable as the concentration of carbon nanotubes in the cement matrix increases, indicating that higher harmonics are more susceptible to minute microstructural changes.

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Section: Resultssupporting

confidence: 83%

mentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Monitoring the Hydration Process in Carbon Nanotube Reinforced Cement-Based Composites Using Nonlinear Elastic Waves

Tragazikis¹,

Kordatou²,

Exarchos³

et al. 2021

Applied Sciences

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An optical measurement system for monitoring of concrete curing

Schmid,

Vierhub-Lorenz,

Reiterer

2024

Optical Sensing and Detection VIII

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Prefabricated concrete has gained significant popularity in the construction industry due to advantages, including costeffectiveness, reduced construction time, and enhanced quality control. The curing process of prefabricated concrete elements is particularly crucial as it determines their strength development, durability, and overall quality. In this study, we present our work on the development of an optical measurement system for the monitoring and optimization of the prefabrication process. We compare multispectral camera-based methods with the application of multispectral laser scanners in wavelength regions covering the visible and near infrared spectrum. Based on our measurements, we discuss the pros and cons of the investigated setups to monitor the surface of the concrete elements and capture precise and continuous data on the hydration. We further evaluate the possibility to derive process parameters from it such as the ideal time for dismantling of formwork. The remote monitoring capability of our proposed system could enable real-time data acquisition and analysis, allowing to improve the prefabrication process.

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Multifunctional Cement Mortars Enhanced with Graphene Nanoplatelets and Carbon Nanotubes

Dalla

Tragazikis

Trakakis

et al. 2021

Sensors

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Recent findings have brought forward the potential of carbon nano-species, especially nanotubes and graphene, to impart exceptional multifunctional potential to cement, offering simultaneous enhancement of mechanical, fracture mechanical and electrical properties. While available knowledge on the topic is still limited, there is a complete absence of direct comparisons of the potential of the nano-species to improve strength and toughness and provide multifunctionality to the mortars. The study offers a comprehensive overview of these potentials, for mortars modified with pure graphene nanoplatelets and carbon nanotubes at consistent, directly comparable, concentrations up to 1.2 wt.%. Testing included flexure under pure bending moments, axial compression, electrical resistivity measurements and fracture tests under three point bending configuration; the latter were also independently assessed by acoustic emission. Differences in documented properties and optimal concentrations associated with improved mechanical performance were directly compared and rationalized in terms of nanospecies morphology. Dramatic, statistically consistent improvements in fracture behavior, up to 10-fold of control values, were documented for specific nanofiller concentrations, indicating an excellent potential of the material system for contemporary smart construction applications. An exceptionally favorable comparison of acoustic emission and fracture energy data confirmed that the non-destructive technique can independently assess the fracture performance of mortars with exceptional precision.

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Monitoring the Nonlinear Acoustic Behavior of Fresh Cementitious Materials during the Hardening Process Using Laser Doppler Vibrometry

Cited by 3 publications

References 39 publications

Monitoring the Hydration Process in Carbon Nanotube Reinforced Cement-Based Composites Using Nonlinear Elastic Waves

Monitoring the Hydration Process in Carbon Nanotube Reinforced Cement-Based Composites Using Nonlinear Elastic Waves

An optical measurement system for monitoring of concrete curing

Multifunctional Cement Mortars Enhanced with Graphene Nanoplatelets and Carbon Nanotubes

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