scholarly journals Analysis of the Electromagnetic Signature of Reinforced Concrete Structures for Nondestructive Evaluation of Corrosion Damage

2012 ◽  
Vol 61 (4) ◽  
pp. 1090-1098 ◽  
Author(s):  
Gemma Roqueta ◽  
Lluís Jofre ◽  
Maria Q. Feng
Keyword(s):  
Reinforced Concrete ◽  
Nondestructive Evaluation ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Reinforced Concrete Structures ◽  
Electromagnetic Signature

scholarly journals Reserves and exposure assessment of reinforced concrete structures safety while reducing its power resistance

2019 ◽  
Vol 135 ◽  
pp. 03010 ◽  
Author(s):  
Ekaterina Kuzina ◽  
Vladimir Rimshin ◽  
Alexey Neverov
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Structural Safety ◽  
Reinforced Concrete Structures ◽  
Joint Power ◽  
Engineering State ◽  
Safety Parameters ◽  
Construction Operation ◽  
Structural Solutions

Structural safety of buildings is such an engineering state of the structures operability, foundations, the features of their joint power resistance to expected loads and impacts, taking into account their possible combinations in direction, intensity and mode, which ensures the established functional use with established reliability. The structural safety of buildings depends on design, on compositional and structural solutions, technological measures during construction and operation, which must be provided at all stages of the facility’s existence (construction, operation, repair, reconstruction, dismantling and dismantling). It is necessary to take into account the structural safety parameters of reinforced concrete structures that have received corrosion damage during solving the problems of construction and reconstruction of buildings and structures. Suggestions to quantify the reserves and exposure of structural safety and, accordingly, the reduction in power resistance of corrosion-damaged reinforced concrete structures are presented in this article.

scholarly journals The electrochemical performance and modification mechanism of the corrosion inhibitor on concrete

2021 ◽  
Vol 28 (1) ◽  
pp. 352-562
Author(s):  
Meiyan Hang ◽  
Minghui Jiang ◽  
Junwei Xu ◽  
Teng Cheng ◽  
Hao Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Electrochemical Performance ◽  
Corrosion Inhibitor ◽  
Electrode Potential ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Chloride Ions ◽  
Reinforced Concrete Structures ◽  
Chloride Corrosion ◽  
Chloride Environment

Abstract The purpose of this study was to solve the chloride corrosion damage problems of the rebar in reinforced concrete structures under the chloride environment. The effects of 1.0% triethanolamine (abbreviated as 1.0% TEA), 1.0% Ca(NO2)2, and 0.5% TEA + 0.5% Ca(NO2)2 (abbreviated as 1.0% composite corrosion inhibitor) on the electrochemical performance and modification mechanism of the mortar specimens were investigated by combining macro experiment and microanalysis. The results showed that the electrode potential of the rebar was effectively improved by incorporating the 1.0% composite corrosion inhibitor. This composite corrosion inhibitor displayed the ability to stabilize the electrode potential of the rebar; it also formed a passive film on the surfaces of the rebar, protected the rebar from chloride attack, and achieved satisfactory electrochemical performance. In addition, it could also effectively improve the strength of the mortar specimens and possessed the strong ability to bind chloride ions, thus signifying that it could promote cement hydration and accelerate the formation of cement to form AFt crystals. Therefore, the results of this investigation confirmed that this composite corrosion inhibitor could be effectively used in practical engineering to prevent the corrosion of reinforced concrete structures.

scholarly journals Detection of Defects in Reinforced Concrete Structures Using Ultrasonic Nondestructive Evaluation with Piezoceramic Transducers and the Time Reversal Method

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4176 ◽  
Author(s):  
Guoqi Zhao ◽  
Di Zhang ◽  
Lu Zhang ◽  
Ben Wang
Keyword(s):  
Reinforced Concrete ◽  
Nondestructive Evaluation ◽  
Ultrasonic Wave ◽  
Time Reversal ◽  
Concrete Structures ◽  
Interface Debonding ◽  
Reinforced Concrete Structures ◽  
Tennis Ball ◽  
Cross Sectional ◽  
The Cross

Reinforced concrete is of vital importance in many civil and industrial structural applications. The effective bonding between steel and concrete is the core guarantee of the safe operation of the structures. Corrosion or other interface debonding in steel-concrete is a typical failure mode during the long service period of the structures, which can severely reduce the load-bearing capacity. The Non-destructive Evaluation technique has been applied to civil engineering structures in recent years. This paper investigates the evaluation of reinforced concrete structures that have interface defects, including the cross-sectional loss and cracks, by using the piezoceramic induced ultrasonic wave and time reversal method. Ultrasonic wave is used as actuating wave to obtain the signals with defect information. Time reversal method is applied to localize and characterize defect along the interface of the steel-concrete and to image the defect through the cross-sectional scanning. Experiments were conducted to perform Nondestructive Evaluation by using six reinforced concrete components with different levels of defects. The invisible damages were made by the cutting part of the steel and embedding a table tennis ball inside concrete structures. The results show that the time reversed method can locate and evaluate the defects along the steel reinforced concrete, and the obtained defect images at the cross-section of the concrete structure are accurate.

scholarly journals CARBONIZATION OF CONCRETE AND CORROSION OF REINFORCEMENT OF REINFORCED CONCRETE STRUCTURES OF UNDERGROUND SEWERAGE SYSTEMS

2021 ◽  
pp. 47-56
Author(s):  
Valeriy Makarenko ◽  
Volodymyr Gots ◽  
Tetiana Khomutetska ◽  
Yulia Makarenko ◽  
Tetiana Arhatenko ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Diffusion Processes ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Exposure Period ◽  
Chloride Ions ◽  
Reinforced Concrete Structures ◽  
Term Operation ◽  
Nace Solution

The process of carbonization of concrete with different ratio of water to cement (W/C) was studied, and the influence of the environment on corrosion damage of reinforced concrete reinforcement was studied. The results of the study of carbonization of concrete on specially prepared model samples of concrete with a size of 250x250x250 mm with an exposure period in NACE solution for 500 days without external load are presented. Measurements of corrosion damage of reinforcing rods, which were placed inside concrete cubes, were performed. The method of estimating the amount of carbonization of concrete and corrosion of reinforcement is described in detail in known scientific papers. The obtained data testify to the active carbonization of concrete during the whole exposure period of the samples in NACE solution, however, concrete prepared at the ratio W/C = 0.5 and 0.6 is particularly significant in terms of carbonization intensity. Concrete with a ratio of W/C = 0.7 is less susceptible to damage. Moreover, a similar trend is observed for corrosion of fittings. This is due to the fact that the increase of the aqueous medium in the concrete mass facilitates diffusion processes of delivery to the reactive zone of chemically aggressive ingredients such as carbon dioxide, chloride ions, hydrogen, sulfur, sulfate ions, various types of bacteria and the like. The kinetics of concrete carbonization and corrosion of reinforcing bars in chemically aggressive NACE medium depending on the exposure period of the samples in the model solution was experimentally studied. It is established that with the increase of the water-cement ratio W/C from 0.5 to 0.7, the depth of carbonization and the layer thickness of corrosion products increase sharply. The flooding of the surface layers of the reinforcement and their strong embrittlement in the process of long-term operation of the reinforcement in the structure of reinforced concrete, which causes a decrease in crack resistance in general of reinforced concrete structures. The degradation of reinforcing steel during long-term operation in aggressive environments, which leads to premature corrosion damage to the reinforcement with subsequent destruction of the structure, was investigated experimentally with the involvement of high-precision metallographic equipment.

scholarly journals Consideration of corrosion damages of operated reinforced concrete structures in conditions of triaxial stress - strain state

2020 ◽  
Vol 8 (3) ◽  
pp. 40-46
Author(s):  
Mikhail Berlinov ◽  
Marina Belinova ◽  
A. Tvorogov ◽  
E. Petschkina
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Phenomenological Approach ◽  
Triaxial Stress ◽  
Reinforced Concrete Structures ◽  
Stress Strain ◽  
Triaxial Deformation ◽  
Stress Strain State

The problem of linearization of resolving equations for calculating operational reinforced concrete structures under three-axis deformation, taking into account corrosion damage, is considered. A method for accounting for corrosion damage based on a phenomenological approach for deformations under triaxial deformation is presented.

scholarly journals Innovative concrete sensing technologies for nuclear power plants

2019 ◽  
Vol 71 (1) ◽  
pp. 9-19
Author(s):  
Scott David B ◽  
Chen Shen-En
Keyword(s):  
Reinforced Concrete ◽  
Nondestructive Evaluation ◽  
Nuclear Power ◽  
Power Plants ◽  
Structural Characteristics ◽  
Concrete Structures ◽  
Power Industry ◽  
Nuclear Power Industry ◽  
Reinforced Concrete Structures ◽  
Embedded Sensing

Nondestructive evaluation has been used to investigate construction and use of concrete structures for the nuclear power industry. Nuclear concrete often has unique structural characteristics which increase proclivity towards degradation and inhibit analysis and inspection using traditional nondestructive techniques. Modern embedded sensing technologies can provide opportunities for the in-depth evaluation of nuclear reinforced-concrete structures. This paper offers an assessment of emerging embedded and surficial sensor techniques, and critically evaluates sensor applicability in the analysis of concrete structures used in the nuclear power industry.

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