Thermographic non-destructive testing damage detection for metals and cementitious materials

2000 ◽  
Vol 48 (1) ◽  
pp. 33-43 ◽  
Author(s):  
J K C Shih ◽  
R Delpak ◽  
C W Hu ◽  
P Plassmann ◽  
A Wawrzynek ◽  
...  
Keyword(s):  
Damage Detection ◽  
Cementitious Materials ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

Material Strength Evaluation and Damage Detection by X-Ray Diffraction

1991 ◽  
Vol 35 (A) ◽  
pp. 489-501
Author(s):  
Toru Goto
Keyword(s):  
Damage Detection ◽  
Crystalline Structure ◽  
Material Strength ◽  
Non Destructive Testing ◽  
X Ray Diffraction ◽  
Destructive Testing ◽  
Strength Evaluation ◽  
X Ray ◽  
Surface Observation ◽  
Non Destructive

AbstractThe number of products that have to be inspected in pre-service and/or in service is increasing. Not only inspection for flaws are required increasingly, using the ordinary non-destructive testing, but also inspection of material characteristics, such as material strength evaluation and/or damage detection. For such inspection, X-ray diffraction has great possibilities as one of the most promising techniques, because it is (a) noncontact, (b) very sensitive to changes in parameters of the crystalline structure, and (c) suitable for surface observation.In this paper, three topics are introduced which will be useful in the field of material strength evaluation and damage detection using X-ray diffraction.

scholarly journals Permittivity measurement of cementitious materials and constituents with an open-ended coaxial probe: combination of experimental data, numerical modelling and a capacitive model

2019 ◽  
Vol 4 ◽  
pp. 39-48 ◽  
Author(s):  
Vincent Guihard ◽  
Frédéric Taillade ◽  
Jean-Paul Balayssac ◽  
Barthélémy Steck ◽  
Julien Sanahuja
Keyword(s):  
Cementitious Materials ◽  
Reference Plane ◽  
Non Destructive Testing ◽  
Calibration Technique ◽  
Destructive Testing ◽  
Near Surface ◽  
Measuring Device ◽  
Coaxial Probes ◽  
Non Destructive ◽  
Coaxial Probe

The study presents the development of a new two-dimensional FEM numerical model describing the operation of two large open-ended coaxial probes designed to investigate the permittivity of concrete, and its constituents. This numerical simulation, combined with a capacitive approach describing the behaviour of the probes, enabled to prove the suitability of such device to determine the permittivity of dispersive dielectrics. Finding back the permittivity of a specified material by calculation of the S parameters, change of the reference plane and use of the capacitive model is the key to the proof. Measurements performed onto different materials show good similarities with the numerical simulations. Special considerations are mentioned concerning the size of the probe and its ability to measure the permittivity of heterogeneous materials made of large inclusions. Combination of such numerical tool and measuring device can be used as a non-destructive testing technique to assess the near surface permittivity of concrete structures or as a calibration technique for GPR measurements.

scholarly journals Experimental Investigation of Cementitious Materials Using the Prism Technique

2020 ◽  
Vol 30 (1) ◽  
pp. 196-212
Author(s):  
Rahma Messaoudi ◽  
Cherif Bouzerira ◽  
Morad Grimes ◽  
Hocine Oucief
Keyword(s):  
Mode Conversion ◽  
Estimation Algorithm ◽  
Cementitious Materials ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pulse Echo ◽  
Non Destructive ◽  
Pulse Echo Method ◽  
Made In

AbstractNumerous studies have shown that the non-destructive testing has proved the exceptional role in supervising the quality of concrete. Today, they represent an alternative that contributes to the resolution of materials diagnostic problems without altering them. This work presents an experimental study using a pulse-echo method that has the advantage of generating two types of wave (compressional and shear) by a mode conversion using just one transducer. The samples were made in a prismatic form. The results recovered from backscattered echoes are extracted using an estimation algorithm. These data were exploited to determine velocities of the tested material then the reflection coefficients for related them with the compressive strength. The tests were conducted with six samples with varied water/cement ratio. The results obtained showed that the prism technique has the potential to evaluate characteristics cementitious material using this proposed process.

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