Using Acoustic Emission Methods to Monitor Cement Composites during Setting and Hardening

Kucharczyková, Barbara; Mikulášek, Karel; Pazdera, Lubos; Topolář, Libor; Smutny, Jaroslav

doi:10.3390/app7050451

Cited by 21 publications

(11 citation statements)

References 22 publications

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“…Table 1 shows the composition of composites. From each mixture, three test specimens with dimensions of 40 × 40 × 160 mm were manufactured and tested [16]. All specimens were coated with the PE foil during the hardening in laboratory conditions at a temperature of (21 ± 2)°C and relative humidity of (60 ± 10)% until the time of testing.…”

Section: Methodsmentioning

confidence: 99%

The experimental comparison of parameters signals of acoustic emission during destructive test on composites based on cement

et al. 2018

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The paper reports the analysis of acoustic emission signals captured during compressive strength tests of fine-grained cement-based composites of various composition. Acoustic emission monitoring belongs to a non-invasive and passive non-destructive testing technique. It is one of the most sensitive experimental techniques to monitor cracking of materials. While the acoustic emission phenomenon is directly associated with nucleation of cracks in materials based on cement, the measurement of these kinds of materials is readily applied to detect cracking activity. An understanding of microstructure–performance relationships is the key to true understanding of material behaviour.

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Section: Methodsmentioning

confidence: 99%

The experimental comparison of parameters signals of acoustic emission during destructive test on composites based on cement

et al. 2018

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“…Some studies indicated start or peak of AE activity during the calorimetric temperature peak that implies relation to the hydration reaction [23][24][25]. However, other studies [26,27] showed the large majority of recorded hits occurring earlier than this peak, leading to the conclusion that significant processes (possibly of lower intensity and thus more difficult to register) occur from as early as the mixing time, much before the chemical reaction of hydration initiates and any heat is developed. Differences in the acquisition equipment (including sensor frequency range and sensitivity), the coupling (with or without waveguide) and the specimen size do not allow for robust conclusions relatively to the original sources.…”

Section: Acoustic Emission In Fresh Concretementioning

confidence: 99%

The Contribution of Elastic Wave NDT to the Characterization of Modern Cementitious Media

Lefever

Snoeck

Belie

et al. 2020

Sensors

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To mitigate autogenous shrinkage in cementitious materials and simultaneously preserve the material’s mechanical performance, superabsorbent polymers and nanosilica are included in the mixture design. The use of the specific additives influences both the hydration process and the hardened microstructure, while autogenous healing of cracks can be stimulated. These three stages are monitored by means of non-destructive testing, showing the sensitivity of elastic waves to the occurring phenomena. Whereas the action of the superabsorbent polymers was evidenced by acoustic emission, the use of ultrasound revealed the differences in the developed microstructure and the self-healing of cracks by a comparison with more commonly performed mechanical tests. The ability of NDT to determine these various features renders it a promising measuring method for future characterization of innovative cementitious materials.

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“…The acoustic emission method allows such an approach. The analysis of the recorded acoustic emission signals can be successfully used for a more detailed evaluation of the behaviour of the tested materials [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Using Acoustic Emission Methods to Monitor Cement Composites during Setting and Hardening

Cited by 21 publications

References 22 publications

The experimental comparison of parameters signals of acoustic emission during destructive test on composites based on cement

The experimental comparison of parameters signals of acoustic emission during destructive test on composites based on cement

The Contribution of Elastic Wave NDT to the Characterization of Modern Cementitious Media

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

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