Ultrasonic wave velocity measurement in concrete using the impact-echo method

2019 ◽  
Vol 61 (1) ◽  
pp. 15-19 ◽  
Author(s):  
V K Kachanov ◽  
I V Sokolov ◽  
R V Kontsov ◽  
S V Lebedev ◽  
S A Fedorenko
Keyword(s):  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Velocity Measurement ◽  
Impact Echo ◽  
Ultrasonic Wave Velocity ◽  
The Impact ◽  
Impact Echo Method

scholarly journals Intra-Ring Wood Density and Dynamic Modulus of Elasticity Profiles for Black Spruce and Jack Pine from X-ray Densitometry and Ultrasonic Wave Velocity Measurement

Forests ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 569 ◽  
Author(s):  
Wassim Kharrat ◽  
Ahmed Koubaa ◽  
Mohamed Khlif ◽  
Chedly Bradai
Keyword(s):  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Wood Density ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Velocity Measurement ◽  
Black Spruce ◽  
Jack Pine ◽  
Ultrasonic Wave Velocity ◽  
X Ray

Currently, ultrasonic measurement is a widely used nondestructive approach to determine wood elastic properties, including the dynamic modulus of elasticity (DMOE). DMOE is determined based on wood density and ultrasonic wave velocity measurement. The use of wood average density to estimate DMOE introduces significant imprecision: Density varies due to intra-tree and intra-ring differences and differing silvicultural treatments. To ensure accurate DMOE assessment, we developed a prototype device to measure ultrasonic wave velocity with the same resolution as that provided by the X-ray densitometer for measuring wood density. A nondestructive method based on X-ray densitometry and the developed prototype was applied to determine radial and intra-ring wood DMOE profiles. This method provides accurate information on wood mechanical properties and their sources of variation. High-order polynomials were used to model intra-ring wood density and DMOE profiles in black spruce and jack pine wood. The transition from earlywood to latewood was defined as the inflection point. High and highly significant correlations were obtained between predicted and measured wood density and DMOE. An examination of the correlations between wood radial growth, density, and DMOE revealed close correlations between density and DMOE in rings, earlywood, and latewood

Estimation of Impact-Echo Method for the Assessment of Long-Term Frost Resistance of Ceramic Tiles

2014 ◽  
Vol 1000 ◽  
pp. 285-288 ◽  
Author(s):  
Michal Matysík ◽  
Iveta Plšková ◽  
Zdeněk Chobola
Keyword(s):  
Frost Resistance ◽  
Surface Condition ◽  
Acoustic Method ◽  
Ceramic Tiles ◽  
Impact Echo ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Confocal Scanning ◽  
The Impact ◽  
Impact Echo Method

The aim of this paper is to evaluate the possibility of using the Impact-echo method for assessment of extremely long period of frost resistance of ceramic tiles. Sets of ceramic tiles of the Ia class to EN 14 411 B standard made by manufacture RACOs have been analyzed. The ceramic tiles under investigation have been subjected to 500 freeze-thaw-cycle based degradation in compliance with the relevant EN ISO 10545-12 standard. To verify the correctness of the Impact-echo method results, additional physical properties of the ceramic tiles under test have been measured. To analyze the specimen surface condition, we also used Olympus LEXT 3100 confocal scanning microscope. It has been proved that the acoustic method Impact-echo is a sensitive indicator of the structure condition and can be applied to the ceramic cladding element frost resistance and service life prediction assessment.

scholarly journals Evaluation of the degree of degradation using the impact-echo method in civil engineering

2016 ◽  
Vol 50 (6) ◽  
pp. 879-884
Author(s):  
Daniela Štefková ◽  
Kristýna Timčaková ◽  
Libor Topolá ◽  
Petr Cikrle
Keyword(s):  
Civil Engineering ◽  
Impact Echo ◽  
The Impact ◽  
Impact Echo Method ◽  
Degree Of Degradation
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