scholarly journals Acoustic measurements of bored pile length using two channels

2020 ◽  
Vol 22 (4) ◽  
pp. 180-191 ◽  
Author(s):  
D. G. Samarin ◽  
V. L. Ustyuzhanin ◽  
A. A. Lobanov
Keyword(s):  
Elastic Waves ◽  
Measurement Accuracy ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Bored Pile ◽  
Acoustic Methods ◽  
Advance Research ◽  
Bored Piles ◽  
Non Destructive ◽  
Pile Length

Non-destructive testing of structures is an effective way to determine their required parameters. One of the promising directions is the acoustic measurement of the pile length using two channels. This method is based on the excitation and registration of elastic waves on the pile surface. A limitation of acoustic methods is that the speed of the elastic waves in the pile is assumed to be known in advance. Research results show that the practical application of this condition can lead to a significant error. This is especially true for bored piles, where the speed of the elastic wave propagation is determined by many different factors. This paper proposes to increase the measurement accuracy of the acoustic wave speed in the bored pile. The use of two measurement channels, which implies the introduction of the specified distance between the receiving devices, made it possible to increase the measurement accuracy up to 5 %.

scholarly journals Non-Destructive Testing of Materials in Civil Engineering

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3237 ◽  
Author(s):  
Krzysztof Schabowicz
Keyword(s):  
Building Materials ◽  
Civil Engineering ◽  
Current Trend ◽  
Building Structures ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Acoustic Methods ◽  
Recent Developments ◽  
Concrete Elements ◽  
Non Destructive

This issue was proposed and organized as a means to present recent developments in the field of non-destructive testing of materials in civil engineering. For this reason, the articles highlighted in this editorial relate to different aspects of non-destructive testing of different materials in civil engineering, from building materials to building structures. The current trend in the development of non-destructive testing of materials in civil engineering is mainly concerned with the detection of flaws and defects in concrete elements and structures, and acoustic methods predominate in this field. As in medicine, the trend is towards designing test equipment that allows one to obtain a picture of the inside of the tested element and materials. Interesting results with significance for building practices were obtained.

The Use of Acoustic Methods for Non-Destructive Testing of High-Temperature-Degraded Cement-Based Composite

2013 ◽  
Vol 446-447 ◽  
pp. 1395-1399 ◽  
Author(s):  
Zdeněk Chobola ◽  
Daniela Štefková ◽  
Kristýna Šamárková
Keyword(s):  
High Temperature ◽  
Acoustic Method ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Impact Echo ◽  
Flexural Tensile Strength ◽  
Acoustic Methods ◽  
Non Destructive

The present paper deals with the applicability of Impact-echo acoustic method to testing of cement-based composites prepared from a mix of cement mortar and quartz sand, which were intentionally degraded by high-temperature treatment (in the temperatures range from 200°C to 1200°C). Changes in the the bulk density and the flexural tensile strength were monitored during the degradation for comparison.

scholarly journals Directional Ultrasound Source for Solid Materials Inspection: Diffraction Management in a Metallic Phononic Crystal

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6148
Author(s):  
Hossam Selim ◽  
Rubén Picó ◽  
Jose Trull ◽  
Miguel Delgado Prieto ◽  
Crina Cojocaru
Keyword(s):  
Elastic Waves ◽  
Phononic Crystal ◽  
Target Object ◽  
Ultrasonic Waves ◽  
Proof Of Concept ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Focusing Effect ◽  
Waves Propagation ◽  
Non Destructive

In this work, we numerically investigate the diffraction management of longitudinal elastic waves propagating in a two-dimensional metallic phononic crystal. We demonstrate that this structure acts as an “ultrasonic lens”, providing self-collimation or focusing effect at a certain distance from the crystal output. We implement this directional propagation in the design of a coupling device capable to control the directivity or focusing of ultrasonic waves propagation inside a target object. These effects are robust over a broad frequency band and are preserved in the propagation through a coupling gel between the “ultrasonic lens” and the solid target. These results may find interesting industrial and medical applications, where the localization of the ultrasonic waves may be required at certain positions embedded in the object under study. An application example for non-destructive testing with improved results, after using the ultrasonic lens, is discussed as a proof of concept for the novelty and applicability of our numerical simulation study.

scholarly journals A Study on the Detection of Internal Defect Types for Duct Depth of Prestressed Concrete Structures Using Electromagnetic and Elastic Waves

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3931
Author(s):  
Young-Geun Yoon ◽  
Jae-Yun Lee ◽  
Hajin Choi ◽  
Tae-Keun Oh
Keyword(s):  
Prestressed Concrete ◽  
Elastic Waves ◽  
Principal Component ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Flexural Mode ◽  
Impact Echo ◽  
Multichannel Analysis ◽  
Non Destructive

Prestressed concrete (PSC) is widely used for the construction of bridges. The collapse of several bridges with PSC has been reported, and insufficient grout and tendon corrosion were found inside the ducts of these bridges. Therefore, non-destructive testing (NDT) technology is important for identifying defects inside ducts in PSC structures. Electromagnetic (EM) waves have limited detection of internal defects in ducts due to strong reflections from the surface of the steel ducts. Spectral analysis of the existing impact echo (IE) method is limited to specific conditions. Moreover, the flexural mode in upper defects of ducts located at a shallow depth and delamination defects inside ducts are not considered. In this study, the applicability of the elastic wave of IE was analyzed, and multichannel analysis of surface, EM, and shear waves was employed to evaluate six types of PSC structures. A procedure using EM waves, IE, and principal component analysis (PCA) was proposed for a more accurate classification of defect types inside ducts. The proposed procedure was effective in classifying upper, internal, and delamination defects of ducts under 100 mm in thickness, and it could be utilized up to 200 mm in the case of duct defect limitations.

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