Effect of Steel Plates on Estimation of the Compressive Strength of Concrete via Ultrasonic Testing

Rhim, Hong C.; Kim, Dae You; Cho, Chang Shik; Kim, Do Hyun

doi:10.3390/ma13040887

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…(4) The microstructure and material composition of the interface area of the optimal group of concrete aggregate were analyzed. The internal damage of concrete was reflected by non-destructive ultrasonic testing technology [40,41] and scanning electron microscopy, and the reason for resistance to chloride erosion in hot and humid environment was explained, and the mechanism of concrete erosion and deterioration was revealed.…”

Section: Test Scheme Designmentioning

confidence: 99%

Mechanical Properties and Microstructure of Rice Husk Ash–Rubber–Fiber Concrete under Hygrothermal Environment

Wang

Pang

2023

Polymers

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In order to study the mechanical properties of rice husk ash–rubber–fiber concrete (RRFC) under hygrothermal environment, the optimal group was selected by orthogonal test. The mass loss, relative dynamic elastic modulus analysis, strength analysis, degradation degree analysis after cyclic loading and internal microstructure analysis of the optimal group of RRFC samples after dry–wet cycles under different environments and temperatures were compared and analyzed. The results show that the large specific surface area of rice husk ash optimizes the particle size distribution of RRFC specimens, reacts to form C-S-H gel, enhances the compactness of concrete, and forms a dense structure as a whole. The presence of rubber particles and PVA fibers effectively improves the mechanical properties and fatigue resistance of RRFC. The comprehensive mechanical properties of RRFC with rubber particle size of 1–3 mm, PVA fiber content of 1.2 kg·m−3 and rice husk ash content of 15% are the best. The compressive strength of the specimens after dry–wet cycles in different environments generally increased first and then decreased, reaching a peak at the seventh dry–wet cycle, and the compressive strength of the specimens under chloride salt solution decreased more than that under clear water solution. Thes provided new concrete materials for the construction of highways and tunnels in coastal areas. Under the premise of ensuring the strength and durability of concrete, it is of great practical significance to explore new roads for energy conservation and emission reduction.

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Section: Test Scheme Designmentioning

confidence: 99%

Mechanical Properties and Microstructure of Rice Husk Ash–Rubber–Fiber Concrete under Hygrothermal Environment

Wang

Pang

2023

Polymers

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“…With knowledge of the component thickness, the ultrasonic velocity of the material can be determined accurately based on time measurement. This method has also been used for non-metallic materials, for example, for concrete [18,19] or polymers [20]. There is also a large number of studies on different metals [16,21,22].…”

Section: Introductionmentioning

confidence: 99%

Correlating Ultrasonic Velocity in DC04 with Microstructure for Quantification of Ductile Damage

Wackenrohr,

Herbst,

Wöbbeking

et al. 2023

JMMP

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The detection of ductile damage by image-based methods is time-consuming and typically probes only small areas. It is therefore of great interest for various cold forming processes, such as sheet-bulk metal forming, to develop new methods that can be used during the forming process and that enable an efficient detection of ductile damage. In the present study, ductile damage in DC04 was examined using ultrasonic testing. First, different grain sizes were set by heat treatment. Subsequently, the sheet metal was formed by cold rolling. A clear correlation between the average void diameter and the measured ultrasonic velocity could be shown. The ultrasonic velocity showed a clear decrease when the average void size increased because of the increasing forming degree. The ultrasonic measurements were finally employed to calculate a damage parameter D to determine the amount of ductile damage in the microstructure for different grain sizes after cold rolling.

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“…At present, prevailing non-destructive testing (NDT) methodologies for concrete, such as the impact echo method [1][2][3], ground-penetrating radar method [4][5][6], X-ray computed tomography method [7,8], infrared thermography [9,10], and ultrasonic detection method [11][12][13][14], have demonstrated significant efficacy. However, each of these NDT methods bears inherent limitations.…”

Section: Introductionmentioning

confidence: 99%

An Internal Defect Detection Algorithm for Concrete Blocks Based on Local Mean Decomposition-Singular Value Decomposition and Weighted Spatial-Spectral Entropy

et al. 2023

Entropy

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Within the scope of concrete internal defect detection via laser Doppler vibrometry (LDV), the acquired signals frequently suffer from low signal-to-noise ratios (SNR) due to the heterogeneity of the concrete’s material properties and its rough surface structure. Consequently, these factors make the defect signal characteristics challenging to discern precisely. In response to this challenge, we propose an internal defect detection algorithm that incorporates local mean decomposition-singular value decomposition (LMD-SVD) and weighted spatial-spectral entropy (WSSE). Initially, the LDV vibration signal undergoes denoising via LMD and the SVD algorithms to reduce noise interference. Subsequently, the distribution of each frequency in the scan plane is analyzed utilizing the WSSE algorithm. Since the vibrational energy of the frequencies caused by the defect resonance is concentrated in the defect region, its energy distribution in the scan plane is non-uniform, resulting in a significant difference between the defect resonance frequencies’ SSE values and the other frequencies’ SSE values. This feature is used to estimate the resonant frequencies of internal defects. Ultimately, the defects are characterized based on the modal vibration patterns of the defect resonant frequencies. Tests were performed on two concrete blocks with simulated cavity defects, using an ultrasonic transducer as the excitation device to generate ultrasonic vibrations directly from the back of the blocks and applying an LDV as the acquisition device to collect vibration signals from their front sides. The results demonstrate the algorithm’s capacity to effectively pinpoint the information on the location and shape of shallow defects within the concrete, underscoring its practical significance for concrete internal defect detection in practical engineering scenarios.

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Effect of Steel Plates on Estimation of the Compressive Strength of Concrete via Ultrasonic Testing

Cited by 7 publications

References 13 publications

Mechanical Properties and Microstructure of Rice Husk Ash–Rubber–Fiber Concrete under Hygrothermal Environment

Mechanical Properties and Microstructure of Rice Husk Ash–Rubber–Fiber Concrete under Hygrothermal Environment

Correlating Ultrasonic Velocity in DC04 with Microstructure for Quantification of Ductile Damage

An Internal Defect Detection Algorithm for Concrete Blocks Based on Local Mean Decomposition-Singular Value Decomposition and Weighted Spatial-Spectral Entropy

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