scholarly journals Rebar Shape Time-Evolution During a Reinforced Concrete Corrosion Test: An Electrochemical Model

2019 ◽  
Vol 9 (15) ◽  
pp. 3061
Author(s):  
Guillem de Vera ◽  
Marina Miró ◽  
Enrique Gonzalo Segovia ◽  
Pedro Poveda ◽  
Miguel Ángel Climent
Keyword(s):  
Finite Element Method ◽  
Time Evolution ◽  
Current Distribution ◽  
Corrosion Test ◽  
Volume Increase ◽  
Faraday’S Law ◽  
Concrete Corrosion ◽  
Realistic Description ◽  
Electrochemical Model ◽  
Reinforced Concrete Corrosion

An electrochemical model is presented to calculate the rebar shape time-evolution in reinforced mortar specimens during forced corrosion tests. This provides a more realistic description than the usually used geometric models. The current distribution along the rebar perimeter is calculated by using Finite Element Method (FEM) to solve Laplace equation. Then, Faraday’s law is used to relate current distribution to rebar volume increase due to corrosion products creation. The shape of the rebar section is obtained as a function of corrosion time.

The Influence of Anode Profiles for Three Dimensions Numerical Simulation of Reinforced Concrete Corrosion Using Boundary Element Method

2013 ◽  
Vol 686 ◽  
pp. 261-265 ◽  
Author(s):  
M. Ihsan ◽  
Syarizal Fonna ◽  
M. Ridha ◽  
Syifaul Huzni ◽  
A.K. Arrifin
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Polarization Curves ◽  
Laplace's Equation ◽  
Concrete Corrosion ◽  
Corrosion Simulation ◽  
Reinforced Concrete Corrosion ◽  
Element Method

The corrosion of structures is needed to be identified early to prevent any severe damage of buildings. The conventional technique such as potential mapping for diagnosing of reinforced concrete corrosion has been used widely in the field. However, the method has limitation such as less accuracy, laborious and time-consuming. This study is conducted to develop boundary element method 3 dimensions by considering polarization curves of anode and cathode for corrosion simulation and analyzed the influences of anode profiles for RC corrosion simulation. In this method, the potential in concrete domain was modeled by Laplace’s equation. The anode and cathode areas were represented by each polarization curves. The numerical simulation result shows that the boundary element method 3 dimensions successfully solved the Laplace’s equation in order to simulate corrosion phenomenon of reinforced concrete. The influences of anode profiles for RC corrosion simulation have been analyzed. Further works are needed to reduce the computational effort of corrosion simulation.

scholarly journals Example of analysis of climatic data series with respect to the testing of reinforcement concrete corrosion in a climate chamber

2020 ◽  
Vol 313 ◽  
pp. 00037
Author(s):  
Petr Lehner ◽  
Petr Konečný ◽  
Ryszard Walentyński
Keyword(s):  
Statistical Evaluation ◽  
Data Series ◽  
Rapid Evaluation ◽  
Climatic Data ◽  
Climate Data ◽  
Climate Chamber ◽  
Leos Janacek ◽  
Concrete Corrosion ◽  
Set Up ◽  
Reinforced Concrete Corrosion

The paper presents a possible statistical evaluation of the climate data, namely temperature and relative humidity, with respect to the rapid evaluation of the risk of reinforced concrete corrosion in the laboratory conditions. Data on temperature and humidity from Leoš Janáček Ostrava Airport over the last ten years are analysed. The processed data will be used as the set up for the climate chamber where the concrete samples with steel rods will be placed.

scholarly journals High Directivity Broadband Hexagonal Fractal Ring Antenna with Modified Ground

2020 ◽  
Vol 18 (1) ◽  
pp. 1-8
Author(s):  
Tharanga Premathilake ◽  
Jeevani Jayasinghe ◽  
Omar Saraereh ◽  
Karu Esselle ◽  
Rajas Khokle
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Current Distribution ◽  
Wireless Lan ◽  
Ground Plane ◽  
Fractal Antenna ◽  
Frequency Range ◽  
Mode Of Operation ◽  
Resonant Behavior ◽  
Ring Antenna

A highly directive fractal antenna with a novel shape is proposed in this paper. Finite Element Method based simulations were carried out on the first three iterations of a hexagonal fractal ring and the performance was measured in terms of the resonant behavior, directivity, radiation efficiency, current distribution, and radiation pattern. The second iteration fractal antenna radiates well along the broadside direction at the fundamental mode of operation. The ground plane was modified to improve the performance further. The antenna, etched on an FR4 substrate, has a directivity of 11.8 dB along the broadside direction with multi-frequency broadband performance over the frequency range of 3.12-7.46 GHz. Therefore, the proposed fractal antenna can be used for Wireless LAN applications. The antenna was fabricated and measured in order to validate the results.

Sign in / Sign up

Export Citation Format

Share Document