Ultrasound transmission method to assess raw earthen materials

Bernat-Masó, Ernest; Teneva, E.; Escrig, Christian

doi:10.1016/j.conbuildmat.2017.09.012

Cited by 25 publications

(15 citation statements)

References 33 publications

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“…The final velocities obtained for the packed specimens were lower than on the exposed specimens by approximately 20% for longitudinal to compressive wave velocities (V P ) and 26% for shear wave (V S ) velocities. This behavior was expected due to the moisture content presence, which increases the dispersion of the ultrasonic pulse (Bernat-Maso et al, 2017;Luong et al, 2014). Additionally, we can consider the occurrence of a thixotropic behavior, which may increase the resistance in clayey samples with a high degree of saturation when kept at rest (Jeong et al, 2015;Seng & Tanaka, 2012).…”

Section: Nondestructive Testingmentioning

confidence: 87%

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Soil Elastic Modulus Determined by Ultrasound Tests

Sarro¹,

Ferreira²

2019

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The elastic constants obtained through conventional destructive (triaxial and resilience) tests can present great variability, even for soils with the same classification. Thus, a test is necessary to determine the elastic constants of soils in a reliable and replicable way. The ultrasonic technique is used to characterize rock and several construction materials (wood, cementitious matrices, metals), including the elastic parameters (elastic modulus, shear modulus, and Poisson's ratio). The aim of this study was to verify the correlation between the elastic modulus obtained through ultrasonic testing and through a simple unconfined compression test on compacted clayey soil. Test specimens were molded at normal compression energy with three moisture contents; the specimens were exposed to air and packed with plastic wrap for 120 days. After this period, we performed ultrasonic and compression tests. The technique presented great potential to study the mechanical behavior, with correlation coefficients over 0.97 for both parameters (compressive strength and static elastic modulus). We also verified that the ultrasonic testing is influenced mainly by the moisture content.

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Section: Nondestructive Testingmentioning

confidence: 87%

“…This effect was also observed by and when comparing samples with different moisture content. In addition, the presence of water in the pores of the material may still result in a decrease in the ultrasonic wave amplitude (Bernat-Maso et al, 2017;Mansour et al, 2016;Markov et al, 2014).…”

Section: Nondestructive Testingmentioning

confidence: 99%

Soil Elastic Modulus Determined by Ultrasound Tests

Sarro¹,

Ferreira²

2019

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“…To perform it, the procedure described in [22] was implemented. Two modal analyses were undertaken for each wall: one before strengthening and the other one after curing the strengthening system.…”

Section: Experimental Modal Analysismentioning

confidence: 99%

“…Regarding the fixation procedure, accelerometer was attached to a transmission plate, which was bonded to the wall using cyanoacrylate, like in previous experiences, [22]. Placing additional accelerometers would have been preferable to make data more independent of the only-one accelerometer installation point.…”

Section: Experimental Modal Analysismentioning

confidence: 99%

“…In contraposition, other authors proposed using experimental modal analysis, which crosses load and acceleration data to obtain modal shapes, associated frequencies and damping values. Some applications of this technique were conducted on different structures from concrete beams [21] to rammed earth walls [22]. All concluded that modal analysis is a high-potential non-destructive technique for the structural assessment of large structures.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the performance of CFRP strengthening on masonry walls using experimental modal analysis

Bernat-Masó

2019

Engineering Structures

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Fraud detection and quality assessment of olive oil using ultrasound

Zarezadeh

Aboonajmi

Ghasemi-Varnamkhasti

2020

Food Science & Nutrition

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Today, food safety is recognized as one of the most important human priorities, so effective and new policies have been implemented to improve and develop the position of effective laws in the food industry. Extra virgin olive oil (EVOO) has many amazing benefits for human body's health. Due to the nutritional value and high price of EVOO, there is a lot of cheating in it. The ultrasound approach has many advantages in the food studies, and it is fast and nondestructive for quality evaluation. In this study, to fraud detection of EVOO four ultrasonic properties of oil in five levels of adulteration (5%, 10%, 20%, 35%, and 50%) were extracted. The 2 MHz ultrasonic probes were used in the DOI 1,000 STARMANS diagnostic ultrasonic device in a “probe holding mechanism.” The four extracted ultrasonic features include the following: “percentage of amplitude reduction, time of flight (TOF), the difference between the first and second maximum amplitudes of the domain (in the time–amplitude diagram), and the ratio of the first and second maximum of amplitude.” Seven classification algorithms including “Naïve Bayes, support vector machine, gradient boosting classifier, K‐nearest neighbors, artificial neural network, logistic regression, and AdaBoost” were used to classify the preprocessed data. Results showed that the Naïve Bayes algorithm with 90.2% provided the highest accuracy among the others, and the support vector machine and gradient boosting classifier with 88.2% were in the next ranks.

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Ultrasound transmission method to assess raw earthen materials

Cited by 25 publications

References 33 publications

Soil Elastic Modulus Determined by Ultrasound Tests

Soil Elastic Modulus Determined by Ultrasound Tests

Assessing the performance of CFRP strengthening on masonry walls using experimental modal analysis

Fraud detection and quality assessment of olive oil using ultrasound

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