scholarly journals Detection and Inspection of Steel Bars in Reinforced Concrete Structures Using Active Infrared Thermography with Microwave Excitation and Eddy Current Sensors

Sensors ◽  
2016 ◽  
Vol 16 (2) ◽  
pp. 234 ◽  
Author(s):  
Barbara Szymanik ◽  
Paweł Frankowski ◽  
Tomasz Chady ◽  
Cyril John Chelliah
Keyword(s):  
Reinforced Concrete ◽  
Infrared Thermography ◽  
Eddy Current ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Active Infrared Thermography ◽  
Steel Bars ◽  
Current Sensors ◽  
Microwave Excitation

scholarly journals Corrosion Assessment of Steel Bars Used in Reinforced Concrete Structures by Means of Eddy Current Testing

Sensors ◽  
2015 ◽  
Vol 16 (1) ◽  
pp. 15 ◽  
Author(s):  
Naasson de Alcantara ◽  
Felipe da Silva ◽  
Mateus Guimarães ◽  
Matheus Pereira
Keyword(s):  
Reinforced Concrete ◽  
Eddy Current ◽  
Concrete Structures ◽  
Eddy Current Testing ◽  
Reinforced Concrete Structures ◽  
Current Testing ◽  
Steel Bars ◽  
Corrosion Assessment

Nonlinear Analysis of Bearing Capacity of Reinforced Concrete Structures Using Strip Method

2013 ◽  
Vol 470 ◽  
pp. 921-924
Author(s):  
Hai Chao Tan
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Nonlinear Analysis ◽  
Rectangular Cross Section ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Strip Method ◽  
Basic Assumptions ◽  
Steel Bars ◽  
Fortran Language

As the progress of theory and computer technology, nonlinear analysis is widely applied in civil engineering. Strip method, as one of the numerical methods, is used widely especially in the analysis of beams, columns and shell structures. The first half of this paper introduces the theoretical model and the basic assumptions of the strip method; the latter half of this paper compiles the strip method into computer program using FORTRAN language. At last, using beams with rectangular cross-section of reinforced concrete structures as an example, the paper analyze the factors, such as the strength of the steel bars, which have an impact on the bearing capacity of reinforced concrete structures.

Magnetic variation in construction steels under tensile stress. Empirical research with Helmholtz coils

2021 ◽  
Vol 71 (341) ◽  
pp. e243
Author(s):  
D. Ferrández ◽  
C. Morón ◽  
P. Saiz ◽  
A. Morón
Keyword(s):  
Reinforced Concrete ◽  
Electromotive Force ◽  
Concrete Structures ◽  
Tensile Tests ◽  
Reinforced Concrete Structures ◽  
Secondary Circuit ◽  
Helmholtz Coils ◽  
Steel Bars ◽  
Magnetic Variation ◽  
The Magnetic Field

Steel is responsible for providing resistance to flexotraction to reinforced concrete structures. Steel is responsible for providing reinforced concrete structures with a flexural strength. For this reason, it is important to study its behaviour under different tensile states. This study used measuring equipment that was able to determine variations in magnetic properties of B500-SD steel bars during standard tensile tests. The magnetic field generated by a Helmholtz coil was collected through a secondary circuit. This enables the induced electromotive force to relate with the steel deflection stages when subjected to the tests. Moreover, it was possible to determine the variation of magnetic permeability when submitting 12mm and 16mm diameter bars to different tensile states. This method could prove extremely useful in determining the tensile state of ribbed steel bars that are embedded into the concrete structure.

Magnetoelastic Measurements of Steel Stress under Uniaxial Loading

2006 ◽  
Vol 321-323 ◽  
pp. 377-380 ◽  
Author(s):  
Hong C. Rhim ◽  
Bo Hwan Oh ◽  
Hyo Seon Park
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Uniaxial Loading ◽  
Magnetic Response ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Traditional Technique ◽  
Steel Bar ◽  
Steel Bars ◽  
Different Diameters

An attempt has been made to measure existing steel stress using magnetoelasticity. A device has been developed and used for the measurement of magnetism in response to the deformation of a steel bar. The proposed technique can be used for the assessment of existing reinforced concrete structures by the measurements of steel stress embedded inside concrete. A traditional technique requires to break the existing steel bar to measure existing strain. However, the proposed technique is developed to measure the stress without damaging the steel bar. A successful application of magnetoelasticity depends on the establishment of relationship between elastic and magnetic response due to loading. To investigate the correlation between the two, steel bars are loaded in tension under uniaxial loading while the magnetic reading is recorded. Based on the test results, equations are suggested to predict stress for steel bars with different diameters.

scholarly journals Reinforcement corrosion in reinforced concrete Structures: Classification and overview

2021 ◽  
Vol 2 (1) ◽  
pp. 19-24
Author(s):  
Nour Eldeen Abo Nassar
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Control Measures ◽  
Reinforced Concrete Structures ◽  
Reinforcement Corrosion ◽  
Early Failure ◽  
Comprehensive Review ◽  
Rc Structures ◽  
Entire Structure ◽  
Steel Bars

Reinforced concrete (RC) structures have the ability to be extremely durable and able to withstand a diversity of different environmental cases. However, failure in these structures still happens due to precocious reinforcement erosion. If steel reinforcement corrodes in concrete structures, this leads to a decrease in the lifetime and durability of these structures, which cause early failure of the structures, costing significantly to inspect and maintain the deteriorating structures. Then, monitoring of reinforcement corrosion is of great importance to prevent early failure of structures. Structures corrosion can be decreased through correct monitoring and taking appropriate control measures in the appropriate period of time. When steel bars corrode, the formation of rust causes the concrete to be separated from the steel and then thereafter. In case this issue is not addressed, it may influence the entire structure. This paper attempts to present a comprehensive review of corrosion of rebar in RC structures, its mechanisms, monitoring and prevention.

Electrochemical protection against corrosion for steel bars in reinforced concrete structures exposed to seawater

2019 ◽  
pp. 185-190
Author(s):  
Yu. L. Kuzmin ◽  
O. A. Stavitsky
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Concrete Structures ◽  
Offshore Structures ◽  
Steel Reinforcement ◽  
Reinforced Concrete Structures ◽  
Marine Structures ◽  
Electrochemical Protection ◽  
Steel Bars ◽  
Corrosion Of Steel

The paper analyzes ways to ensure long service life (up to 50 years) of reinforced concrete marine structures. It has been established that durability and maintenance-free operation of floating and coastal offshore structures for 50 and more years depend on corrosion of steel reinforcement which could be avoided by applying electrochemical protection. The parameters of electrochemical protection against corrosion of steel fittings are given.

Steel Tendon Detection in Reinforced Concrete Structures Using Infrared Thermography

2017 ◽  
Vol 17 (6) ◽  
pp. 341-349
Author(s):  
Seunggwon Yoo ◽  
◽  
Namjun Cho ◽  
Hyun-Ki Kim ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Infrared Thermography ◽  
Concrete Structures ◽  
Reinforced Concrete Structures

scholarly journals Experimental evaluation of coupler behavior for mechanical rebar splices in reinforced concrete structures

2018 ◽  
Vol 11 (6) ◽  
pp. 1326-1353
Author(s):  
V. G. CHIARI ◽  
A. L. MORENO JUNIOR
Keyword(s):  
Performance Evaluation ◽  
Reinforced Concrete ◽  
Structural Integrity ◽  
Test Procedure ◽  
Concrete Structures ◽  
Test Methods ◽  
Reinforced Concrete Structures ◽  
Steel Bars ◽  
Important Solution ◽  
Brazilian Standard

Abstract The use of mechanical splices to connect steel bars is an important solution in many infrastructure projects worldwide. In Brazil, this system is rarely used. The Brazilian standards regarding this subject are old and out of date; particularly with regard to the performance evaluation test methods for these splices in the laboratory. This paper presents and discusses the test procedure proposed in the international standard ISO 15835 [1] in light of the current procedure defined by Brazilian Standard ABNT NBR 8548 [2], applied to types of mechanical splices commonly used in Brazil: taper threaded and bolted couplers. Performance parameters for these mechanical splicing systems related to structural integrity in reinforced concrete structures are evaluated on the basis of the results obtained in these tests. In the end, it is intended that this paper provide support for discussion of design procedures and laboratory performance evaluation of couplers for mechanical splices of steel bars in reinforced concrete structures in future reviews of Brazilian standard ABNT NBR 8548 [2].

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