Advances of Monitoring Corrosion in Reinforced Concrete Based on UGW

2014 ◽  
Vol 525 ◽  
pp. 499-503
Author(s):  
Zhu Peng Zheng
Keyword(s):  
Reinforced Concrete ◽  
Steel Corrosion ◽  
Guided Wave ◽  
Interface Roughness ◽  
Corrosion Monitoring ◽  
Future Trends ◽  
Rc Structures ◽  
Monitoring Techniques ◽  
The Past ◽  
Ultrasonic Guided Wave

Monitoring the condition of steel corrosion in reinforced concrete (RC) is imperative for ensuring structural serviceability and durability of RC structures. The techniques based on ultrasonic guided wave (UGW) gain more and more popularities as they have many advantages for monitoring corrosion in reinforced concrete. In this paper, UGW based monitoring techniques in the past decade are reviewed, including corrosion monitoring mechanism and feature extraction, monitoring corrosion induced deboning, monitoring pitting corrosion, monitoring corrosion induced interface roughness. Finally, the challenges and future trends in the development of UGW based monitoring techniques for condition assessment of corrosion inreinforced concrete are put forward in this paper.

scholarly journals Review of Physical Based Monitoring Techniques for Condition Assessment of Corrosion in Reinforced Concrete

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Ying Lei ◽  
Zhu-Peng Zheng
Keyword(s):  
Reinforced Concrete ◽  
Influence Factors ◽  
Steel Corrosion ◽  
Condition Assessment ◽  
Guided Wave ◽  
Interface Roughness ◽  
Corrosion Monitoring ◽  
Monitoring Techniques ◽  
Ultrasonic Guided Wave ◽  
Corrosion Sensor

Monitoring the condition of steel corrosion in reinforced concrete (RC) is imperative for structural durability. In the past decades, many electrochemistry based techniques have been developed for monitoring steel corrosion. However, these electrochemistry techniques can only assess steel corrosion through monitoring the surrounding concrete medium. As alternative tools, some physical based techniques have been proposed for accurate condition assessment of steel corrosion through direct measurements on embedded steels. In this paper, some physical based monitoring techniques developed in the last decade for condition assessment of steel corrosion in RC are reviewed. In particular, techniques based on ultrasonic guided wave (UGW) and Fiber Bragg grating (FBG) are emphasized. UGW based technique is first reviewed, including important characters of UGW, corrosion monitoring mechanism and feature extraction, monitoring corrosion induced deboning, pitting, interface roughness, and influence factors. Subsequently, FBG for monitoring corrosion in RC is reviewed. The studies and application of the FBG based corrosion sensor developed by the authors are presented. Other physical techniques for monitoring corrosion in RC are also introduced. Finally, the challenges and future trends in the development of physical based monitoring techniques for condition assessment of steel corrosion in RC are put forward.

Physical Based Techniques for Monitoring Corrosion in RC

2014 ◽  
Vol 501-504 ◽  
pp. 881-884
Author(s):  
Zhu Peng Zheng ◽  
Yu Song
Keyword(s):  
Reinforced Concrete ◽  
Steel Corrosion ◽  
Condition Assessment ◽  
Future Trends ◽  
Monitoring Techniques ◽  
The Past ◽  
Direct Measurements

It is imperative to develop effective techniques to monitor the condition of steel corrosion in reinforced concrete (RC) for ensuring structural serviceability and durability. In the past decade, some physical based techniques have been proposed as alternative tools for monitoring corrosion. These physical based monitoring techniques can conduct accurate condition assessment of steel corrosion through direct measurements on embedded steels. In this paper, some primary physical based monitoring techniques for condition assessment of steel corrosion in reinforced concrete in the recent years are presented and the challenges and future trends in the development of physical based monitoring techniques for condition assessment of corrosion in reinforced concrete are also put forward.

scholarly journals Numerical Simulation of Monitoring Corrosion in Reinforced Concrete Based on Ultrasonic Guided Waves

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Zhupeng Zheng ◽  
Ying Lei ◽  
Xin Xue
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Guided Waves ◽  
Guided Wave ◽  
Corrosion Monitoring ◽  
Time Frequency ◽  
Ultrasonic Guided Wave ◽  
Simulation Based ◽  
Time Frequency Localization ◽  
Corrosion Defects

Numerical simulation based on finite element method is conducted to predict the location of pitting corrosion in reinforced concrete. Simulation results show that it is feasible to predict corrosion monitoring based on ultrasonic guided wave in reinforced concrete, and wavelet analysis can be used for the extremely weak signal of guided waves due to energy leaking into concrete. The characteristic of time-frequency localization of wavelet transform is adopted in the corrosion monitoring of reinforced concrete. Guided waves can be successfully used to identify corrosion defects in reinforced concrete with the analysis of suitable wavelet-based function and its scale.

Damage of Reinforced Concrete Structures due to Steel Corrosion

2015 ◽  
Vol 1111 ◽  
pp. 187-192
Author(s):  
Corina Sosdean ◽  
Liviu Marsavina ◽  
Geert de Schutter
Keyword(s):  
Reinforced Concrete ◽  
Building Materials ◽  
Structural Integrity ◽  
Colorimetric Method ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
Degradation Process ◽  
Reinforced Concrete Structures ◽  
Chloride Ingress ◽  
Rc Structures

Reinforced concrete (RC) became one of the most widely used modern building materials. In the last decades a great interest has been shown in studying reinforcement corrosion as it became one of the main factors of degradation and loss of structural integrity of RC structures. The degradation process is accelerated in the case of RC structures situated in aggressive environments like marine environments or subjected to de-icing salts. In this paper it is shown how steel corrosion of the embedded rebars occurs and how this affects the service life of reinforced concrete structures. Also, an experimental study regarding the combined effect of carbonation and chloride ingress was realized. Samples with and without rebars were drilled from a RC slab which was stored in the laboratory for two years. Non-steady state migration tests were realized in order to determine the chloride profile, while the carbonation depth was measured using the colorimetric method based on phenolphthalein spraying. It was concluded that carbonation has a significant effect on chloride ingress, increasing it.

Full-Field Displacement and Strain Measurement: Application of Digital Image Correlation to Reinforcement Corrosion Induced Concrete Fracture and Cover Cracking

2015 ◽  
Vol 738-739 ◽  
pp. 889-892
Author(s):  
Qiang Li ◽  
Hong Fa Yu ◽  
Jing Tong
Keyword(s):  
Reinforced Concrete ◽  
Steel Corrosion ◽  
Test Method ◽  
Image Correlation ◽  
Concrete Fracture ◽  
Reinforcement Corrosion ◽  
Full Field ◽  
Rc Structures ◽  
Whole Process ◽  
Cover Cracking

Cracking of the cover concrete due to steel corrosion is considered as one of the major issues of durability of reinforced concrete (RC) structures. This paper tentatively studies the feasibility of DIC to reinforcement corrosion induced concrete fracture and cover cracking measurement. Advantages and limitations of DIC-based non-contact full-field measurement for corrosion induced concrete fracture and cover cracking are discussed. Drawbacks in this test need improvement are pointed out and test method for further study of whole process of simulating the real reinforced concrete cracking is put forward.

The Application of NUS Method for Concrete-Covered Steel Corrosion Monitoring

2015 ◽  
Vol 1124 ◽  
pp. 267-272
Author(s):  
Michal Matysík ◽  
Kristýna Timcakova
Keyword(s):  
Reinforced Concrete ◽  
Steel Corrosion ◽  
Structural Defects ◽  
Corrosion Monitoring ◽  
Ultrasonic Spectroscopy ◽  
Sensitive Material ◽  
Engineering Structures ◽  
Wide Range ◽  
Thick Steel ◽  
Corrosion Of Steel

The corrosion of steel elements in reinforced concrete can cause considerable damage to civil engineering structures. Early detection of corrosion is therefore very important. Steel in concrete is protected if the concrete pH is higher than 9.6. Carbonated concrete, unfortunately, has a lower pH and this causes that the unprotected steel reinforcement begins to corrode. Nonlinear ultrasonic spectroscopy (NUS) methods shows potential to be very reliable to identify the structure defects in a wide range of materials. These methods are based on the fact that crack-induced nonlinearity makes a sensitive material impairment indicator. This paper describes the ability of one of NUS methods for monitoring steel corrosion in reinforced concrete. It studies nonlinear interaction between elastic waves and structural defects caused by corrosion of steel in concrete. For research we used concrete beams with ten millimetres thick steel rods. These beams were exposed to accelerated degradation by chlorides. The paper presents the initial results of our research.

Wireless ultrasonic guided wave tomography for corrosion monitoring

2008 ◽  
Author(s):  
Jaya Prakash Koduru ◽  
Luke Breon ◽  
Roger Royer ◽  
Joseph L. Rose
Keyword(s):  
Guided Wave ◽  
Corrosion Monitoring ◽  
Ultrasonic Guided Wave ◽  
Wave Tomography
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