scholarly journals Simulation the effect of anode-cathode displacement and anode type on reinforced concrete cathodic protection using BEM

2018 ◽  
Vol 197 ◽  
pp. 12001 ◽  
Author(s):  
Syarizal Fonna ◽  
Syifaul Huzni ◽  
Muzaiyin Arika Putra ◽  
Rudi Kurniawan
Keyword(s):  
Reinforced Concrete ◽  
Cathodic Protection ◽  
Potential Distribution ◽  
Research Result ◽  
Electrical Potential ◽  
System Model ◽  
Reinforcing Steel ◽  
Previous Researcher ◽  
Steel Rebar ◽  
Simulation Results

The aim of the study is to simulate the effect of anode-cathode displacement and anode type on the potential distribution of reinforced concrete (RC) cathodic protection (CP) system using boundary element method (BEM). For the simulation, Laplace equation was used to model the RC domain. The boundary conditions for the anode and cathode (reinforcing steel/rebar) were represented by its polarization curve. By using BEM, the electrical potential values on the whole domain should be calculated. Therefore, the effects of those parameters were studied based on the rebar electrical potential. For the study, the CP system model and geometry were obtained from a previous researcher. The BEM simulation results show that the anode-cathode displacement affects the distribution of electrical potential on the protected reinforcing steel. It was consistent with the previous research result. The results also show, as expected, that the anode type influences the electrical potential value on the rebar. Hence, those parameters should be considered in designing and/or evaluating the RC CP system.

LATTICE BOLTZMANN SIMULATIONS OF MIXING ENHANCEMENT BY THE ELECTRO-OSMOTIC FLOW IN MICROCHANNELS

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1515-1518 ◽  
Author(s):  
JINKU WANG ◽  
MORAN WANG ◽  
ZHIXIN LI
Keyword(s):  
Fluid Flow ◽  
Lattice Boltzmann ◽  
Potential Distribution ◽  
Electrical Potential ◽  
Mixing Enhancement ◽  
Lattice Boltzmann Methods ◽  
Osmotic Flow ◽  
Lattice Boltzmann Simulations ◽  
Simulation Results ◽  
Electro Osmotic Flow

The Lattice Boltzmann methods are used to study the mixing enhancements by the electro-osmotic flow in microchannel. Three sets of lattice evolution methods are performed for the fluid flow, for the electrical potential distribution, and for the concentration propagation. The simulation results show that the electro-osmotic flow induces y-directional velocity which enhances the mixing in microchannels. The mixing enhancement is related with the surface zeta potential arrangement and the external electric field strength.

Study of Influence of Stray Current on Potential Distribution of Pipeline by Numerical Simulation

2010 ◽  
Vol 154-155 ◽  
pp. 265-268
Author(s):  
Xiao Dong Zhao ◽  
Jie Yang ◽  
Shao Hua Xing
Keyword(s):  
Numerical Simulation ◽  
Cathodic Protection ◽  
Potential Distribution ◽  
Simulation Technique ◽  
Polarization Degree ◽  
Stray Current ◽  
Convenient Means ◽  
Measurement Results ◽  
Simulation Results ◽  
Numerical Simulation Technique

In this paper, numerical simulation technique was used to simulate the potential distribution when the X70 steel was influenced by stray current of different strength. The simulation results suggested that without cathodic protection, X70 steel was obviously anodic polarized in the current-out zone, with the potentials of -636mV, -559mV and -500mV respectively when the stray current was 15mA, 50mA and 100mA. The anodic polarization degree increased with the increasing of stray current density. The potential of the current-out zone was about -1000mV, -870mV and -780mV respectively when cathodic protection was adopted, and X70 steel was fully protected as the stray current corrosion controlled. The accuracy of simulation was proved by comparison simulation results with practical measurement results, which showed that the numerical simulation technique was an efficient, quick and convenient means for stray current corrosion study.

scholarly journals The Performance of Carbon Fibre Composites as ICCP Anodes for Reinforced Concrete Structures

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Chinh Van Nguyen ◽  
Paul Lambert ◽  
Pal Mangat ◽  
Fin O’Flaherty ◽  
Graeme Jones
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Cathodic Protection ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
Concrete Surface ◽  
Reinforced Concrete Structures ◽  
Reinforcing Steel ◽  
Fibre Composites ◽  
Carbon Fibre Composites

Cathodic protection has been proven to be one of the most widely applicable and cost-effective solutions for tackling steel corrosion in reinforced concrete. In this study, the possible use of carbon fibre composites, which are primarily used to strengthen concrete members, has been investigated as impressed current cathodic protection anodes. Carbon fibre anodes have been assessed in both concrete and calcium hydroxide solution. Two bonding mediums incorporating epoxy and geopolymer have also been investigated. The results demonstrate that epoxy resin can be used for bonding carbon fibre fabric anodes to reinforced concrete structures while geopolymer is more effective for bonding carbon fibre reinforced polymer (CFRP) rod into preformed grooves in the concrete surface. The dissolution of carbon fibre anode appears to stablise after a period of time, dependent upon the size and shape of the anode and applied voltage and current. Based on the present results, a maximum current density of 128 mA/m2 of reinforcing steel area is recommended for the operation of CFRP fabric anode and 64 mA/m2 of reinforcing steel area for that of CFRP rod anode.

The Grobogan Mud Volcano Complex: An Identification to Reveal the Opportunity of Hydrocarbon Exploration

2020 ◽  
Author(s):  
C. Jatu
Keyword(s):  
Water Analysis ◽  
Middle Eocene ◽  
Research Result ◽  
Hydrocarbon Exploration ◽  
System Model ◽  
Mud Volcano ◽  
Hydrocarbon Potential ◽  
Mud Volcanoes ◽  
Central Java ◽  
Surface Data

Mud volcanoes in Grobogan are referred as the Grobogan Mud Volcanoes Complex in Central Java where there is evidence of oil seepages. This comprehensive research is to determine the characteristics and hydrocarbon potential of the mud volcanoes in the Central Java region as a new opportunity for hydrocarbon exploration. The Grobogan Mud Volcano Complex consists of eight mud volcanoes that have its characteristics based on the study used the geological surface data and seismic literature as supporting data on eight mud volcanoes. The determination of geological surface characteristics is based on geomorphological analysis, laboratory analysis such as petrography, natural gas geochemistry, water analysis, mud geochemical analysis and biostratigraphy. Surface data and subsurface data are correlated, interpreted, and validated to make mud volcano system model. The purpose of making the mud volcanoes system model is to identify the hydrocarbon potential in Grobogan. This research proved that each of the Grobogan Mud Volcanoes has different morphological forms. Grobogan Mud Volcanoes materials are including muds, rock fragments, gas, and water content with different elemental values. Based on this research result, there are four mud volcano systems models in Central Java, they are Bledug Kuwu, Maesan, Cungkrik, and Crewek type. The source of the mud is from Ngimbang and Tawun Formation (Middle Eocene to Early Miocene) from biostratigraphy data and it been correlated with seismic data. Grobogan Mud Volcanoes have potential hydrocarbons with type III kerogen of organic matter (gas) and immature to early mature level based on TOC vs HI cross plot. The main product are thermogenic gas and some oil in relatively small quantities. Water analysis shows that it has mature sodium chloride water. This analysis also shows the location was formed within formations that are deposited in a marine environment with high salinity. Research of mud volcanos is rarely done in general. However, this comprehensive research shows the mud volcano has promising hydrocarbon potential and is a new perspective on hydrocarbon exploration.

scholarly journals Investigation of Corrosion and Cathodic Protection in Reinforced Concrete

2007 ◽  
Vol 154 (5) ◽  
pp. C261 ◽  
Author(s):  
D. A. Koleva ◽  
J. H. W. de Wit ◽  
K. van Breugel ◽  
Z. F. Lodhi ◽  
G. Ye
Keyword(s):  
Reinforced Concrete ◽  
Cathodic Protection

Passive corrosion control and active corrosion prevention of the reinforced concrete structures by electrochemical chloride removal and inhibitors

2013 ◽  
Vol 61 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Guofu Qiao ◽  
Yi Hong ◽  
Tiejun Liu ◽  
Jinping Ou
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Concrete Cover ◽  
Reinforced Concrete Structures ◽  
Reinforcing Steel ◽  
Corrosion Control ◽  
Cell Potential ◽  
Content Type ◽  
Chloride Removal ◽  
Active Corrosion

Purpose – The aim of this paper was to investigate the passive corrosion control and active corrosion protective effect of the reinforced concrete structures by electrochemical chloride removal (ECR) method and inhibitors approach, respectively. Design/methodology/approach – The concentration of aggressive chloride ion distributed from the reinforcing steel to the surface of the concrete cover was analyzed during the ECR processes. Besides, the half-cell potential, the concrete resistance R c , the polarization resistance R p and the capacitance of double layer C dl of the steel/concrete system were used to characterize the electrochemical performance of the concrete prisms. Findings – The effectiveness of ECR could be enhanced by increasing the amplitude of potential or prolonging the time. Inhibitor SBT-ZX(I) could successfully prevent the corrosion development of the reinforcing steel in concrete. Originality/value – The research provides the scientific basis for the practical application of ECR and inhibitors in the field.

A Robust Trajectory Tracking Control Scheme of Two-Link Flexible Manipulator

2011 ◽  
Vol 328-330 ◽  
pp. 2108-2112
Author(s):  
Jing Shuang Lu ◽  
Chun Mei Du ◽  
Rui Zhou ◽  
Na Li
Keyword(s):  
Trajectory Tracking ◽  
Tracking Control ◽  
Vertical Plane ◽  
Flexible Manipulator ◽  
System Model ◽  
Error Signal ◽  
Dynamics Model ◽  
Trajectory Tracking Control ◽  
Control Scheme ◽  
Simulation Results

A simple dynamics model is established based on the two-link flexible manipulator moving within the vertical plane, and a robust simple control scheme is put forward. The advantages of this scheme are simple and good robustness. Only the error signal is needed when designing the control scheme and the acquirement of control signal does not depend on the system model. The simulation results show that this method has a good robustness and stability.

Fire Behaviors of Restrained RC Beams with Slab

2010 ◽  
Vol 163-167 ◽  
pp. 1445-1450
Author(s):  
Gui He Tang ◽  
Bo Wu
Keyword(s):  
Reinforced Concrete ◽  
Computer Program ◽  
Axial Force ◽  
Stiffness Ratio ◽  
Rc Beams ◽  
Slab Width ◽  
Standard Fire ◽  
Rotational Restraint ◽  
Simulation Results ◽  
In Fire

Using the computer program SAFIR, the behaviors of restrained reinforced concrete (RC) beams with slab exposed to ISO834 standard fire are analyzed. The influences of three parameters (i.e., width of slab, axial restraint stiffness ratio, and rotational restraint stiffness ratio) on the beams’ behaviors in fire are investigated. Simulation results show that: (a) the axial force in the slab is much larger than that in the beam on the whole; (b) after 0.5 hour of heating the axial force in the slab decreases gradually with an increasing of the slab width ranging from 1.0 m to 2.5 m, but the influence of the slab width ranging from 1.0 m to 2.5 m on the axial force in the beam is limited; and (c) the effect of the rotational restraint stiffness ratio on the axial force in the beam/slab is very limited, but the beam’s peak hogging moment increases gradually with an increasing of the rotational restraint stiffness ratio.

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