Using of Impact-Echo Methods to Assessment of Reinforced Concrete Structures Corrosion

The paper deals with the study of dominant frequencies of an Impact-Echo method response signal obtained from a reinforced concrete beam with a steel rod diameter of 8 mm. Tension pulse was produced in axis of the rod at one end and detected in axis at opposite end of rod. Dominant frequencies of the response signal will be the main criterions for the reinforced concrete rebar corrosion progress. The article presents the results of measurements obtained after 12 months controlled degradation in aqueous NaCl solution. The results were compared with measurements of electrical resistance of reinforcing steel by using the Thomson double bridge.

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Monitoring of Reinforced Concrete Structure Corrosion by Using Impact-Echo Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1000.239 ◽

2014 ◽

Vol 1000 ◽

pp. 239-242 ◽

Cited By ~ 2

Author(s):

Kristýna Šamárková ◽

Daniela Štefková ◽

Zdeněk Chobola

Keyword(s):

Reinforced Concrete ◽

Concrete Beam ◽

Acoustic Method ◽

Reinforced Concrete Beam ◽

Dominant Frequency ◽

Reinforced Concrete Structure ◽

Main Criterion ◽

Impact Echo ◽

Opposite Position ◽

Impact Echo Method

This study deals with frequency inspection of response signal which was obtained from a reinforced concrete beam. Impact-Echo method was used for finding the dominant frequency which is the main criterion for condition assessment of reinforced concrete. The results of acoustic method were compared with measurements of electrical resistance of reinforcing steel by using the Thomson double bridge. The concrete beam with a steel rod diameter of 6 mm was tested. Tension pulse was produced in the centre of the concrete beam and detected in opposite position of the concrete beam.

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Toward Structural Health Monitoring of Civil Structures Based on Self-Sensing Concrete Nanocomposites: A Validation in a Reinforced-Concrete Beam

International Journal of Concrete Structures and Materials ◽

10.1186/s40069-020-00451-8 ◽

2021 ◽

Vol 15 (1) ◽

Author(s):

Diego L. Castañeda-Saldarriaga ◽

Joham Alvarez-Montoya ◽

Vladimir Martínez-Tejada ◽

Julián Sierra-Pérez

Keyword(s):

Reinforced Concrete ◽

Damage Detection ◽

Direct Current ◽

Health Monitoring ◽

Electrical Resistance ◽

Concrete Beam ◽

Reinforced Concrete Beam ◽

Structural Member ◽

Rc Beam ◽

Electric Resistance

AbstractSelf-sensing concrete materials, also known as smart concretes, are emerging as a promising technological development for the construction industry, where novel materials with the capability of providing information about the structural integrity while operating as a structural material are required. Despite progress in the field, there are issues related to the integration of these composites in full-scale structural members that need to be addressed before broad practical implementations. This article reports the manufacturing and multipurpose experimental characterization of a cement-based matrix (CBM) composite with carbon nanotube (CNT) inclusions and its integration inside a representative structural member. Methodologies based on current–voltage (I–V) curves, direct current (DC), and biphasic direct current (BDC) were used to study and characterize the electric resistance of the CNT/CBM composite. Their self-sensing behavior was studied using a compression test, while electric resistance measures were taken. To evaluate the damage detection capability, a CNT/CBM parallelepiped was embedded into a reinforced-concrete beam (RC beam) and tested under three-point bending. Principal finding includes the validation of the material’s piezoresistivity behavior and its suitability to be used as strain sensor. Also, test results showed that manufactured composites exhibit an Ohmic response. The embedded CNT/CBM material exhibited a dominant linear proportionality between electrical resistance values, load magnitude, and strain changes into the RC beam. Finally, a change in the global stiffness (associated with a damage occurrence on the beam) was successfully self-sensed using the manufactured sensor by means of the variation in the electrical resistance. These results demonstrate the potential of CNT/CBM composites to be used in real-world structural health monitoring (SHM) applications for damage detection by identifying changes in stiffness of the monitored structural member.

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Effect of Thermal Loading on Selected Parameters of Reinforced Concrete Obtained by Acoustic NDT Method

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.296.131 ◽

2019 ◽

Vol 296 ◽

pp. 131-136

Author(s):

Iveta Plšková ◽

Michal Matysík ◽

Zdeněk Chobola

Keyword(s):

Reinforced Concrete ◽

Thermal Loading ◽

Acoustic Method ◽

Frequency Spectra ◽

Impact Echo ◽

Steel Reinforced Concrete ◽

Before And After ◽

Non Destructive ◽

Impact Echo Method ◽

Dominant Frequencies

The paper presents the results of experiments carried out on test samples made from reinforced concrete. Within this experiment, concrete beams with steel reinforcement in the middle were made. The concrete samples were tested by a non-destructive acoustic Impact-echo method before and after high temperature loading (after cooling to room temperature). We focused on the dominant frequencies shift in the frequency spectra obtained by this method. The aim was to assess the ability of aforementioned acoustic method to detect the thermal damage of steel reinforced concrete.

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Impact-Echo Methods to Assessment Corrosion of Reinforced Concrete Structures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.627.268 ◽

2014 ◽

Vol 627 ◽

pp. 268-271 ◽

Cited By ~ 2

Author(s):

Kristýna Šamárková ◽

Zdeněk Chobola ◽

Daniela Štefková ◽

Ivo Kusák

Keyword(s):

Reinforced Concrete ◽

Concrete Structure ◽

Signal Analysis ◽

Damping Factor ◽

Reinforced Concrete Structures ◽

Reinforced Concrete Structure ◽

Nacl Solution ◽

Frequency Signal ◽

Impact Echo ◽

Dominant Frequencies

The aim of this paper is to evaluate the corrosion of reinforced concrete structure. To assess the state of corrosion we used frequency signal analysis, where we observed the changes in dominant frequencies and growth of damping factor λ. Tension pulse was produced in axis of the rod at one end and detected in axis at opposite end of rod. Diameter of steel rod was 8 mm. The article presents the results of measurements obtained during 24 months controlled degradation in aqueous NaCl solution.

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