Tracing of Concrete Hydration by Means of Impedance Spectroscopy (New Tool for Building Elements Testing)

2012 ◽  
Vol 248 ◽  
pp. 370-378 ◽  
Author(s):  
Ivo Kusak ◽  
Miroslav Lunak ◽  
Pavel Schauer
Keyword(s):  
Impedance Spectroscopy ◽  
Setting Time ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Testing Method ◽  
Specimen Quality ◽  
Concrete Hydration ◽  
Tan Δ ◽  
Non Destructive ◽  
Method Group

Concrete setting and hardening designate the concrete grade. The impedance spectroscopy method, as one of the non-destructive testing method group, was used to characterize concrete specimens and track the changes in the concrete spectrum. Variances in the tan δ (f) and Im Z(f) or Re Z(f) of the specimens under investigation have been observed. The specimen quality has been described by means of the loss type prevailing in the material. The results of this study are expected to provide information about the correlation between the n-factor and the concrete setting time.

Dielectric Properties of Concrete Specimens after Heat Stress

2013 ◽  
Vol 446-447 ◽  
pp. 1389-1394 ◽  
Author(s):  
Miroslav Lunak ◽  
Ivo Kusak ◽  
Zdenek Chobola
Keyword(s):  
Heat Stress ◽  
Stress Factors ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Testing Method ◽  
Concrete Quality ◽  
Specimen Quality ◽  
Tan Δ ◽  
Non Destructive ◽  
Method Group

Concrete quality depends on various stress factors. The impedance spectroscopy method, as one of the non-destructive testing method group, was used to characterize concrete specimens and track the changes in the concrete spectrum after heat stress. The temperature range was between 0°C and 1200°C. Variances in the tan δ (f) and Im Z(f) or Re Z(f) of the specimens under investigation have been observed. The specimen quality has been described by means of the loss type prevailing in the material. The results of this study are expected to provide information about the correlation between the relative permittivity and changes in the structure for heat stress samples.

Nondestructive Testing of Moist Cetris-Basic Wood-Cement Chipboards by Using Impedance Spectroscopy

2015 ◽  
Vol 1124 ◽  
pp. 203-208 ◽  
Author(s):  
Miroslav Luňák ◽  
Ivo Kusák
Keyword(s):  
Impedance Spectroscopy ◽  
Water Content ◽  
Impedance Spectrum ◽  
Measuring Method ◽  
Non Destructive Testing ◽  
Inhomogeneous Materials ◽  
Destructive Testing ◽  
Stress Cycle ◽  
Non Destructive ◽  
Method Group

Impedance spectroscopy (IS) is a non-destructive testing (NDT) method ranking in the electrical engineering measuring method group. It outputs data providing information on material electric and dielectric properties. Microscopically inhomogeneous materials are frequently used in the building industry. Unfortunately, the impedance spectroscopy results and their characterization on the basis of this method are not unambiguous. The frequency spectrum behavior of Cetris-basic specimens was studied by means of the NDT impedance spectroscopy method for various water content values. A stress cycle with defined absolute water content values is described. Influences of potential dielectric losses and the predominance of the polarization and conductivity components in various regions of the impedance spectrum are described for various water content values.

Application of Gradient Based IR Thermography to the GRP Structures Inspection

2011 ◽  
Vol 488-489 ◽  
pp. 682-685 ◽  
Author(s):  
Lovre Krstulović-Opara ◽  
Endri Garafulić ◽  
Branko Klarin ◽  
Željko Domazet
Keyword(s):  
Pulse Heating ◽  
Non Destructive Testing ◽  
Ir Thermography ◽  
Destructive Testing ◽  
Heat Flows ◽  
Testing Method ◽  
Reinforced Polymer ◽  
Gradient Based ◽  
Non Destructive ◽  
Gradient Approach

The article presents application of non destructive testing method based on the pulse heating infrared thermography used to detect material anomalies for the case of glass reinforced polymer structures. The goal of presented research, based on the thermal gradient approach, is to establish the procedure capable of filtering out anomalies from other thermal influences caused by thermal reflections of surrounding objects, geometry influences and heat flows for observed object.

A New Non-destructive Testing Method Applied to Clinching

2021 ◽  
pp. 1461-1468
Author(s):  
Rémi Lafarge ◽  
Alexander Wolf ◽  
Christina Guilleaume ◽  
Alexander Brosius
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Testing Method ◽  
Non Destructive

A Non-Destructive Testing Method and Analysis for Air Pressure Distribution in the Stacks of Building Drainage Systems

2008 ◽  
Author(s):  
Cheng-Li Cheng ◽  
Wan-Ju Liao ◽  
Kuen-Chi He ◽  
Chia-Ju Yen
Keyword(s):  
Pressure Fluctuation ◽  
Drainage System ◽  
Field Testing ◽  
Air Pressure ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Drainage Systems ◽  
Existing Building ◽  
Testing Method ◽  
Non Destructive

A drainage system is one of the most essential facilities in building service engineering. Unfortunately relevant technology used today to analyze it was developed decades ago. This research investigated the case of existing building drainage systems in Taiwan, including our previous studies. The purpose of this paper is the development of a non-destructive testing method of air pressure fluctuation in a stacked building drainage system using field observation and experimental study of stack fluid mechanisms. A portable testing device is developed to execute field testing in existing drainage systems to determine air pressure fluctuation in the stacks of buildings. Meanwhile, the Fourier Transform Process is adopted in this paper to analyze the power spectrum of air pressure fluctuation in a drainage stack and to verify the previous theoretical study. Validation obtained from case-studies can be used to confirm the practicality of this portable and non-destructive testing method. As a result, the proposed testing method can be applied to the diagnosis of existing building drainage systems and improve the design of a drainage system in an existing housing complex.

ABOUT THE PROCEDURAL FRAMEWORK OF THE DIGITAL RADIOGRAPHY AT HAZARDOUS INDUSTRIAL FACILITIES

2019 ◽  
pp. 52-54
Author(s):  
K. A. Bagaev ◽  
N. N. Konovalov
Keyword(s):  
Digital Radiography ◽  
Modern Method ◽  
Necessary Condition ◽  
Imaging Plate ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Industrial Facilities ◽  
Testing Method ◽  
Radiation Testing ◽  
Non Destructive

Radiation testing is non-destructive testing method widely used to detect internal imperfections of technical devices, buildings and constructions at hazardous industrial facilities. Digital radiography is the modern method, which uses phosphor imaging plate as the detector of ionizing radiation. Creation of the relevant procedural framework is the necessary condition for the use of digital radiography at hazardous industrial facilities.

Sign in / Sign up

Export Citation Format

Share Document