• Title/Summary/Keyword: Non-Destructive Investigation

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A Study on the Non-Destructive Investigation Method of Tile Defect in the Bathroom (욕실 타일 하자에 대한 비파괴 조사 방법에 관한 연구)

  • Jung, Gi-Tae;Kim, Bum-Soo;Lee, Jung-Hun;Song, Je-Young;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.209-210
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    • 2017
  • Recently, bathroom tile defects in households are occurring more frequently. Until now, the destructive investigation method has been required to analyze tile defects. This study proposes a non-destructive using a thermal emission camera imaging as a possibly more precise method of investigating tile failure compared to previous existing methods.

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In situ dynamic investigation on the historic "İskenderpaşa" masonry mosque with non-destructive testing

  • Gunaydin, Murat
    • Smart Structures and Systems
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    • v.26 no.1
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    • pp.1-10
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    • 2020
  • Turkey is a transcontinental country located partly in Asia and partly in Europe, and hosted by diverse civilizations including Hittite, Urartu, Lydia, Phrygia, Pontius, Byzantine, Seljuk's and Ottomans. At various times, these built many historic monuments representing the most significant characteristics of their civilizations. Today, these monuments contribute enormously to the esthetic beauty of environment and important to many cities of Turkey in attracting tourism. The survival of these monuments depends on the investigation of structural behavior and implementation of needed repairing and/or strengthening applications. Hence, many countries have made deeper investigations and regulations to assess their monuments' structural behavior. This paper presents the dynamic behavior investigation of a monumental masonry mosque, the "İskenderpaşa Mosque" in Trabzon (Turkey), by performing an experimental examination with non-destructive testing. The dynamic behavior investigation was carried out by determining the dynamic characteristic called as natural frequencies, mode shapes and damping ratios. The experimental dynamic characteristics were extracted by Operational Modal Analysis (OMA). In addition, Finite Element (FE) model of masonry mosque was constructed in ANSYS software and the numerical dynamic characteristics such as natural frequencies and mode shapes were also obtained and compared to experimental ones. The paper aims at presenting the non-destructive testing procedure of a masonry mosque as well as the comparison of experimental and numerical dynamic characteristics obtained from the mosque.

The present condition and problems of non-destructive investigation methods for cultural property (문화재 비파괴 분석법의 현황과 문제점)

  • Kang, Dai-Iil;Hong, Jong-Wook
    • 보존과학연구
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    • s.19
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    • pp.35-60
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    • 1998
  • Cultural properties are valuable objects, which have exposed insevere environment and inherited for a long time but we don’t have correct information concerning materials, structure and skill of manufacture. Because the cultural properties have been destroyed by the deterioration elements as like wind, this must be carefully treated for investigation of exhibition and storage. Even if the observation is scientific research, we must not take actual sample from the object for obtaining information concerning the nature materials and skill of manufacture. so it is elementary principle to use non-destructive investigation method as analytical methods for cultural property. This contribution discusses the present condition and problem of X-ray fluorescence acting as a representative non-destructive investigation method and the difference of statistics to be connected with determination and finally explains the intend facts for analysis of data.

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Micro-Structure Measurement and Imaging Based on Digital Holography

  • Kim, Kyeong-Suk;Jung, Hyun-Chul;Chang, Ho-Seob;Kee, Chang-Doo;Akhter, Naseem
    • Journal of the Korean Society for Nondestructive Testing
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    • v.30 no.3
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    • pp.257-260
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    • 2010
  • Advancements in the imaging and computing technology have opened the path to digital holography for non-destructive investigations of technical samples, material property measurement, vibration analysis, flow visualization and stress analysis in aerospace industry which has widened the application of digital holography in the above fields. In this paper, we demonstrate the non-destructive investigation and micro-structure measurement application of digital holography to the small particles and a biological sample. This paper gives a brief description of the digital holograms recorded with this system and illustratively demonstrated.

Investigation of Concrete Structure Using Geophysical Prospecting Method (물리탐사법을 이용한 콘크리트 구조물 조사에 관한 연구)

  • Suh, Baek-Soo;Kim, Yong-In
    • Journal of Industrial Technology
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    • v.23 no.A
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    • pp.63-68
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    • 2003
  • Non-destructive method by tomography for safety diagnosis of civil engineering and building structures is tried. There are traveltime tomography that uses traveltime and fullwave tomography that uses the initial shock and seismic amplitude. But these methods have difficulty and weak points in accuracy and selection of initial value. In this study, corrected inversion method which is able to solve the two difficulty and this method is applied to theoretical pier model to calculate tomography.

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Investigation on the Ultrasonic Pulse Velocity Equation for Estimating Compressive Strength of High Performance Concrete (고성능 콘크리트의 압축강도 추정을 위한 초음파속도식의 검토)

  • Lee, Tae-Gyu;Kim, Gyu-Yong;Choe, Gyeong-Cheol;Kang, Yeon-Woo;Kim, Soon-Mook;Kim, Soo-Bong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.11a
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    • pp.5-6
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    • 2014
  • For estimating compressive strength of concrete, non-destructive test has conducted generally. It used experimental equation to calculate compressive strength from construction. This study investigated experiment to apply non-destructive test, based on fresh property, compressive strength and ultrasonic pulse velocity of high performance concrete. And it conducted to compare various proposed equation.

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Assessment of London underground tube tunnels - investigation, monitoring and analysis

  • Wright, Peter
    • Smart Structures and Systems
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    • v.6 no.3
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    • pp.239-262
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    • 2010
  • Tube Lines has carried out a "knowledge and investigation programme" on the deep tube tunnels comprising the Jubilee, Northern and Piccadilly lines, as required by the PPP contract with London Underground. Many of the tunnels have been in use for over 100 years, so this assessment was considered essential to the future safe functioning of the system. This programme has involved a number of generic investigations which guide the assessment methodology and the analysis of some 5,000 individual structures. A significant amount of investigation has been carried out, including ultrasonic thickness measurement, detection of brickwork laminations using radar, stress measurement using magnetic techniques, determination of soil parameters using CPT, pressuremeter and laboratory testing, installation of piezometers, material and tunnel segment testing, and trialling of remote photographic techniques for inspection of large tunnels and shafts. Vibrating wire, potentiometer, electro level, optical and fibre-optic monitoring has been used, and laser measurement and laser scanning has been employed to measure tunnel circularity. It is considered that there is scope for considerable improvements in non-destructive testing technology for structural assessment in particular, and some ideas are offered as a "wish-list". Assessment reports have now been produced for all assets forming Tube Lines' deep tube tunnel network. For assets which are non-compliant with London Underground standards, the risk to the operating railway has to be maintained as low as reasonably practicable (ALARP) using enhanced inspection and monitoring, or repair where required. Monitoring techniques have developed greatly during recent years and further advances will continue to support the economic whole life asset management of infrastructure networks.

Condition assessment of fire affected reinforced concrete shear wall building - A case study

  • Mistri, Abhijit;Pa, Robin Davis;Sarkar, Pradip
    • Advances in concrete construction
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    • v.4 no.2
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    • pp.89-105
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    • 2016
  • The post - fire investigation is conducted on a fire-affected reinforced concrete shear wall building to ascertain the level of its strength degradation due to the fire incident. Fire incident took place in a three-storey building made of reinforced concrete shear wall and roof with operating floors made of steel beams and chequered plates. The usage of the building is to handle explosives. Elevated temperature during the fire is estimated to be $350^{\circ}C$ based on visual inspection. Destructive (core extraction) and non-destructive (rebound hammer and ultrasonic pulse velocity) tests are conducted to evaluate the concrete strength. X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) are used for analyzing micro structural changes of the concrete due to fire. Tests are conducted for concrete walls and roof slab on both burnt and unburnt locations. The analysis of test results reveals no significant degradation of the building after the fire which signifies that the structure can be used with full expectancy of performance for the remaining service life. This document can be used as a reference for future forensic investigations of similar fire affected concrete structures.

A Study on the Application of Non-destructive (Ultrasonic) Inspection Technique to Detect Defects of Anchor Bolts for Road Facilities (도로시설물 적용 앵커볼트 결함 검출을 위한 비파괴(Ultrasonic) 검사 기법 적용에 대한 연구)

  • Dong-Woo Seo;Jaehwan Kim;Jin-Hyuk Lee;Han-Min Cho;Sangki Park;Min-Soo Kim
    • Journal of Korean Society of Disaster and Security
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    • v.15 no.4
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    • pp.11-20
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    • 2022
  • The general non-destructive inspection method for anchor bolts in Korea applies visual inspection and hammering inspection, but it is difficult to check corrosion or fatigue cracks of anchor bolts in the part included in the foundation or in the part where the nut and base plate are installed. In reality, objective investigation is difficult because inspection is affected by the surrounding environment and individual differences, so it is necessary to develop non-destructive inspection technology that can quantitatively estimate these defects. Inspection of the anchor bolts of domestic road facilities is carried out by visual inspection, and since the importance of anchor bolts such as bridge bearings and fall prevention facilities is high, the life span of bridges is extended through preventive maintenance by developing non-destructive testing technology along with existing inspection methods. Through the development of this technology, non-destructive testing of anchor bolts is performed and as a technology capable of preemptive/active maintenance of anchor bolts for road facilities, practical use is urgently needed. In this paper, the possibility of detecting defects in anchor bolts such as corrosion and cracks and reliability were experimentally verified by applying the ultrasonic test among non-destructive inspection techniques. When the technology development is completed, it is expected that it will be possible to realize preemptive/active maintenance of anchor bolts by securing source technology for improving inspection reliability.

Colour cathodoluminescence of display materials

  • Nazarov, Michael;Nazarova, Tatiana;Ivannikov, Petr;Saparin, Gennadii
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.1580-1583
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    • 2005
  • We report simple new techniques to express analysis of display materials. Colour Cathodoluminescence combined with scanning electron microscopy and spectroscopy is a powerful, non-destructive, high-resolution method for investigation luminescent materials. Some applications of this method to powder phosphors used in display are demonstrated.

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