scholarly journals Assessment of Reinforced Concrete Corroded Column By Non-Destructive Test

2019 ◽  
Vol 9 (1S) ◽  
pp. 380-383
Keyword(s):  
Reinforced Concrete ◽  
Open Circuit Potential ◽  
Steel Corrosion ◽  
Concrete Columns ◽  
Open Circuit ◽  
Scale Model ◽  
Reinforcement Corrosion ◽  
Test Program ◽  
Non Destructive

Corrosion of rebar is one of the most important factors that affect the durability of reinforced concrete structures. Low water cement ratio, quality of concrete and adequate cover to reinforcement are the main three important factors which can prevent the problem of corrosion. However this factors are insufficient in Splash Zones. Many structures are built as per the codal provisions have suffered rebar corrosion. Effective measures are most important to increase the durability of the structures and to overcome the problem of reinforcement corrosion. This paper discuss and analyzes the NDT results reported from a detailed test program designed to examine the axial behaviour of reinforced concrete columns subjected to steel corrosion. A total of thirty six scale model circular columns were tested. The primary variables of this investigation were the cover to diameter ratio, different degrees of steel corrosion. Corrosion process was accelerated by applying a direct current to the specimens. The measurement of electrochemical parameter was carried out using Open Circuit Potential (OCP) measurement

scholarly journals From Waste to Valuable Resource: Lignin as a Sustainable Anti-Corrosion Coating

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 454 ◽  
Author(s):  
Arman Dastpak ◽  
Kirsi Yliniemi ◽  
Mariana de Oliveira Monteiro ◽  
Sarah Höhn ◽  
Sannakaisa Virtanen ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Linear Sweep Voltammetry ◽  
Corrosion Current ◽  
Polymer Coatings ◽  
Open Circuit ◽  
Linear Sweep ◽  
Cyclic Potentiodynamic Polarization

In this study, a waste of biorefinery—lignin—is investigated as an anticorrosion coating on stainless steel. Corrosion behavior of two lignin types (hardwood beech and softwood spruce) was studied by electrochemical measurements (linear sweep voltammetry, open circuit potential, potentiostatic polarization, cyclic potentiodynamic polarization, and electrochemical impedance measurements) during exposure to simulated body fluid (SBF) or phosphate buffer (PBS). Results from linear sweep voltammetry of lignin-coated samples, in particular, demonstrated a reduction in corrosion current density between 1 and 3 orders of magnitude cf. blank stainless steel. Furthermore, results from cross cut adhesion tests on lignin-coated samples demonstrated that the best possible adhesion (grade 0) of ISO 2409 standard was achieved for the investigated novel coatings. Such findings suggest that lignin materials could transform the field of organic coatings towards more sustainable alternatives by replacing non-renewable polymer coatings.

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.

DEVELOPMENT OF EMBEDDED MINI-SENSOR FOR DIAGNOSIS OF CORROSION OF STEEL REINFORCEMENT IN CONCRETE NONDESTRUCTIVELY

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Mohamed A. Ismail ◽  
Han-Seung Lee ◽  
Mohd Warid Hussin
Keyword(s):  
Reinforced Concrete ◽  
Polarization Resistance ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Reinforced Concrete Structures ◽  
Chloride Ingress ◽  
Reinforcement Corrosion ◽  
Maintenance And Rehabilitation ◽  
Corrosion Of Steel ◽  
Non Destructive

Corrosion of steel reinforcement embedded in concrete is one of the main causes of degradation of reinforced concrete structures. Degradation occurs in reinforced concrete structures from corrosion caused by the Chloride ingress into concrete. That degradation has a severe impact on the structure in terms of maintenance and rehabilitation costs. Therefore, early detection of reinforcement corrosion is important for efficient maintenance, repair and planning. Meanwhile, the evaluation of the corrosion of reinforcement by non-destructive measurements have been used a lot. In particular CM-II (corrosion meter) is used to measure the polarization resistance, but has some disadvantages. Embedded mini-sensor has been developed in order to overcome these disadvantages. In this study, measurement of corrosion by using the mini-sensor is compared with the measured results by CM-II to verify the validity of the newly developed mini senor. Results show that there are agreement in trends of the parameters measured and as such the developed mini sensor has a promising start to be used.

Forming of Corrosion Inhibitor Film during Turbulent Flow

2011 ◽  
Vol 66-68 ◽  
pp. 540-544 ◽  
Author(s):  
Ahmed Y. Musa ◽  
Abdul Amir H. Kadhum ◽  
Abu Bakar Mohamad ◽  
Mohd Sobri Takriff
Keyword(s):  
Turbulent Flow ◽  
Potentiodynamic Polarization ◽  
Flow Condition ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Film Structure ◽  
Open Circuit ◽  
Mild Steel Corrosion ◽  
Scanning Electron

The organic material named 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol (APTT) was studied as inhibitor for mild steel corrosion in 1.0 M HCl at 30 °C. The effects of turbulent flow on the inhibition process were characterized using open circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Turbulent flow condition experiments were simulated by Rotating Cylinder Electrode (RCE). Results obtained from changes of open circuit potential (OCP) with immersion time, potentiodynamic polarization, and impedance measurements all are in good agreement and indicated that the formation and the development of the inhibitor film were flow rate dependence. The scanning electron micrograph confirmed film structure is dependence of flow condition.

Open Circuit Potential Analysis as a Fast Screening Method for the Quality of High-k Dielectric Layers

2003 ◽  
Vol 92 ◽  
pp. 7-10 ◽  
Author(s):  
Martine Claes ◽  
T. Witters ◽  
G. Loriaux ◽  
S. Van Elshocht ◽  
A. Delabie ◽  
...  
Keyword(s):  
Open Circuit Potential ◽  
Screening Method ◽  
Open Circuit ◽  
Potential Analysis ◽  
Fast Screening ◽  
Dielectric Layers ◽  
High K ◽  
High K Dielectric

scholarly journals Pengaruh Variasi Mutu Beton Bertulang Terhadap Cepat Rambat Gelombang Dengan Menggunakan Metode Non Destructive Test

2020 ◽  
Vol 14 (1) ◽  
pp. 60-69
Author(s):  
A.A. Lingga Ariya D. ◽  
◽  
Indradi Wijatmiko ◽  
Christin Remayanti Nainggolan ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Indirect Method ◽  
Direct Method ◽  
Ultrasonic Pulse Velocity ◽  
Pulse Velocity ◽  
Reinforced Concrete Beams ◽  
Building Structures ◽  
Non Destructive ◽  
Test Objects

Preferably in testing, building structures need not be destroyed. Tests that can be used on the concrete can use non-destructive methods that do not damage the test objects. Examples of testing can use UPV tests that are aimed at knowing the quality of concrete from the pulse velocity. The test objects used in this study are reinforced concrete beams with dimensions 20 x 20 x 100 cm. Test objects are differentiated into 3 quality variations of reinforced concrete with quality of concrete12.5 MPa, 18.75 MPa, and 25 MPa. To conduct analysis of the concrete density used PUNDIT PL-200. Ultrasonic pulse velocity into parameters on this test. From the results of the tests, there are differences in the value of different coefficient of the R2 determination. Acquired coefficient value of determination R2 = 0.9076 in direct method. The coefficient value of determination R2 = 0.8718 in the semi-direct method. Coefficient value of determination R2 = 0.3042 at Indirect Method 2 point, and in indirect method 3 point the coefficient value of determination R2 = 0.7524. From this research also obtained comparisons between the three methods, namely between the direct method and the semi-direct method, direct method and indirect method, also semi-direct method and indirect method.

Using the Ultrasonic Method for the Defectoscopy of Failures in Reinforced Concrete Columns

2021 ◽  
Vol 322 ◽  
pp. 203-208
Author(s):  
Kristýna Hrabová ◽  
Sabina Hüblová ◽  
Petr Cikrle ◽  
Tomáš Vymazal
Keyword(s):  
Reinforced Concrete ◽  
Ultrasonic Method ◽  
Permanent Deformation ◽  
Concrete Columns ◽  
Diagnostic Methods ◽  
Reinforced Concrete Column ◽  
Existing Structures ◽  
Non Destructive ◽  
Detailed Determination

Using non-destructive diagnostic methods is currently important not only with regard to preserving existing structures but also with regard to sustainable development, which is getting more and more to the forefront of attention. This paper deals with defectoscopy of a reinforced concrete column made with artificially created defects corresponding to the defects in real structures. Modern diagnostic methods enable detailed determination of the properties of structures and detection of their critical points. A method which appears to be very promising in detecting defects and failures is the ultrasonic method. It enables monitoring the development of failures at different levels of loading. Besides that, permanent deformation will also be monitored during the loading using a strain gauge.

Scale-model testing of reinforced concrete under impact loading conditions

1989 ◽  
Vol 16 (4) ◽  
pp. 459-466 ◽  
Author(s):  
J. A. Sato ◽  
F. J. Vecchio ◽  
H. M. Andre
Keyword(s):  
Reinforced Concrete ◽  
Key Words ◽  
Impact Loading ◽  
Impact Load ◽  
Scaling Theory ◽  
Scale Model ◽  
Reinforced Concrete Structures ◽  
Impact Loads ◽  
Test Program ◽  
Load Conditions

Aspects of scaling theory relating to the response of reinforced concrete structures under impact load conditions are reviewed. Details for modelling concrete and reinforcement, to be consistent with similitude requirements, are also discussed. A test program is described in which models of varying size were constructed, drop tested, and compared with prototype response. An analysis of the test data is made, indicating that, within certain limitations, the predictions of scaling theory are applicable to reinforced concrete subjected to extreme impact loads. Key words: cracking, impact, loads, modelling, reinforced concrete, scaling, stresses, structures, tests.

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