Detecting Voids in Grouted Tendon Ducts of Post-Tensioned Concrete Structures Using the Impact-Echo Method

10.14359/9705 ◽  
1996 ◽  
Vol 93 (4) ◽  
Keyword(s):  
Concrete Structures ◽  
Impact Echo ◽  
The Impact ◽  
Impact Echo Method ◽  
Post Tensioned

Structural Damage Survey Using Nondestructive Tests Based on Stress Waves

2007 ◽  
Vol 348-349 ◽  
pp. 389-392
Author(s):  
Young Sang Cho ◽  
Seong Uk Hong
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Flaw Detection ◽  
Concrete Structures ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Impact Echo ◽  
Nondestructive Tests ◽  
The Impact ◽  
Impact Echo Method

The impact echo method has been widely used to evaluate the integrity of concrete structures. This paper is to study damage detection technique of concrete members using impact echo method, one of the nondestructive tests based on stress waves. Stress wave propagation behavior is to be studied based on wave mechanics in concrete media. Based on the theoretical study, nondestructive tests using stress waves will be conducted to observe the wave behavior on structural damages. For the damage detection of concrete structures, a mock-up specimen was prepared, and various tests were conducted for the study of the behavior of stress waves. The concrete slab of the flaw detection consist of 5 types; the first group for the thickness presumption, the second group for the position of the voids, the third group for the position of the re-bars, the fourth group for the position conduit, and the fifth group for the position of the crack. Test results are evaluated and summarized to verify if the nondestructive tests can survey damages in the concrete structures in this paper.

A Study on the Diagnosis Method of Concrete Structures of School Buildings Using Non-Destructive Tests Based on Stress Waves

2006 ◽  
Vol 321-323 ◽  
pp. 400-403
Author(s):  
Young S. Cho ◽  
Han Seung Lee
Keyword(s):  
Structural Information ◽  
Flaw Detection ◽  
Concrete Structures ◽  
School Facilities ◽  
School Buildings ◽  
Existing Building ◽  
Impact Echo ◽  
The Impact ◽  
Non Destructive ◽  
Impact Echo Method

As most of the elementary, junior high, and high school buildings nationwide have been deteriorated since the quantitative increase of the buildings from 1985, many experts present the issues on the possibility of the structural instability of the building as well as the increase of the cost for maintenance of the building. So, it is necessary to examine the necessary structural information of the school buildings during the course of maintaining education facilities, and it is also necessary to establish some credible accessing procedures on the deteriorating school facilities so that the building structural engineers can propose the necessary standards for the proper maintenance and repairing works. To achieve the necessity, researches have been conducted to find out the ways of diagnosing the compressive strength and the durability of the concrete structures by measuring the compression wave velocity of concrete structures and the flaw detection inside the concrete specimens using the impact echo method, a non-destructive test to simulate the structures of school buildings. In this research, it was found that the impact echo method has great potentials in the application of the building structure maintenance and the repairing activities based on the accurate understanding of the existing school facilities that are being deteriorated. More over, school facilities has sometimes no structural design drawings available which NDT methods can contribute to detect the internal structural damages of existing building structures.

Evaluation of Steel Corrosion in Concrete Structures Using Impact-Echo Method

2020 ◽  
Vol 1158 ◽  
pp. 147-164
Author(s):  
Musab Alhawat ◽  
Amir Khan ◽  
Ashraf Ashour
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
Recycled Aggregate ◽  
Clear Trend ◽  
Impact Echo ◽  
Loss Method ◽  
Corrosion Of Steel ◽  
The Impact ◽  
Impact Echo Method

The impact-echo method is commonly used for detection of flaws in concrete elements based on the shift in the thickness frequency of a plate-like member. However, there is a need to develop this efficient technique for other applications. This paper investigates the feasibility of using the impact echo-method for identifying corrosion of steel reinforcement in concrete structures. For this purpose, 180 reinforced concrete cubes were cast and tested. The main parameters studied were the amount of recycled aggregate (i.e. 0%, 25%, 50% and 100%), nanosilica (1.5% and 3%) and the steel bar diameter (12 and 20mm). Different levels of corrosion were electrochemically induced by applying impressed voltage technique for 2, 5, 10 and 15 days. The impact-echo results were correlated against the actual corrosion levels obtained by the mass loss method. The experimental results showed that the response of impact echo in terms of frequency peaks is found to be sensitive to the high and moderate levels of corrosion. However, no clear trend was observed at the initial stage of corrosion. It is demonstrated that the impact-echo testing can be effectively used to qualitatively detect the damage caused by corrosion phenomenon in reinforced concrete structures.

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

scholarly journals Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Fei Yao ◽  
Guangyu Chen ◽  
Jianhong Su
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Working Conditions ◽  
Acoustic Impedance ◽  
Shield Tunnel ◽  
Test Results ◽  
Impact Echo ◽  
Simulation Results ◽  
The Impact ◽  
Impact Echo Method

To identify shield grouting quality based on impact echo method, an impact echo test of segment-grouting (SG) test piece was carried out to explore effect of acoustic impedance of grouting layers and grouting defects on impact echo law. A finite element numerical simulation on the impact echo process was implemented. Test results and simulation results were compared. Results demonstrated that, under some working conditions, finite element simulation results and test results both agree with theoretical values. The acoustic impedance ratio of SG material influenced the echo characteristics significantly. But thickness frequency could not be detected under some working conditions because the reflected energy is weak. Frequency feature under grouting defects was more complicated than that under no grouting defects.

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