scholarly journals Effect of Cathodic Protection on Reinforced Concrete with Fly Ash Using Electrochemical Noise

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2438
Author(s):  
Jorge García-Contreras ◽  
Citlalli Gaona-Tiburcio ◽  
Irene López-Cazares ◽  
Guillermo Sanchéz-Díaz ◽  
Juan Carlos Ibarra Castillo ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Cathodic Protection ◽  
Electrochemical Noise ◽  
Uniform Corrosion ◽  
Concrete Mixtures ◽  
Impressed Current ◽  
The Difference ◽  
Passive Current ◽  
Corrosion Of Steel

Corrosion of steel reinforcement is the major factor that limits the durability and serviceability performance of reinforced concrete structures. Impressed current cathodic protection (ICCP) is a widely used method to protect steel reinforcements against corrosion. This research aimed to study the effect of cathodic protection on reinforced concrete with fly ash using electrochemical noise (EN). Two types of reinforced concrete mixtures were manufactured; 100% Ordinary Portland Cement (OCP) and replacing 15% of cement using fly ash (OCPFA). The specimens were under-designed protected conditions (−1000 ≤ E ≤ −850 mV vs. Ag/AgCl) and cathodic overprotection (E < −1000 mV vs. Ag/AgCl) by impressed current, and specimens concrete were immersed in a 3.5 wt.% sodium chloride (NaCl) Solution. The analysis of electrochemical noise-time series showed that the mixtures microstructure influenced the corrosion process. Transients of uniform corrosion were observed in the specimens elaborated with (OPC), unlike those elaborated with (OPCFA). This phenomenon marked the difference in the concrete matrix’s hydration products, preventing Cl− ions flow and showing passive current and potential transients in most specimens.

A Study on Cathodic Protection Current Density on Rebar in Onshore Concrete Structure of Persian Gulf

2013 ◽  
Vol 850-851 ◽  
pp. 270-273
Author(s):  
Ya Ping Wang ◽  
Da Jing Fang ◽  
Jun Huang ◽  
Er Bu Shen
Keyword(s):  
Reinforced Concrete ◽  
Current Density ◽  
Cathodic Protection ◽  
Persian Gulf ◽  
Concrete Structure ◽  
Reinforced Concrete Structure ◽  
Marine Corrosion ◽  
Impressed Current ◽  
Corrosion Of Steel ◽  
Control Corrosion

The service life of reinforced concrete structure has been greatly influenced by corrosion of steel, however, impressed current cathodic protection (ICCP) system is able to control corrosion of steel, especially which is corroded by chloride along the coast areas. In this work protection current and related technical parameter in both intake and outfall structure has been investigated in the seawater cooling structure along the coast area of Persian Gulf in Saudi Arabia. The most suitable protection current density provided by ICCP system is 5mA/m2for reinforced concrete structure in the severe marine corrosion area in Middle East.

Cathodic Protection of Grounding Grids

2018 ◽  
pp. 248-286
Keyword(s):  
Cathodic Protection ◽  
Galvanic Corrosion ◽  
Steel Corrosion ◽  
Uniform Corrosion ◽  
Grounding System ◽  
Grounding Grid ◽  
Grounding Grids ◽  
Corrosion Pitting ◽  
Impressed Current ◽  
Cathodic Protection System

This chapter contains the corrosion theory of grounding electrodes and basic electrochemistry in corrosion reactions. It contains also the forms of substation grounding grid corrosion (uniform corrosion, pitting corrosion, galvanic corrosion, microbial influenced corrosion), survey on corrosion rate of substation grounding grid, copper and steel corrosion rates, corrosion protection methods (coating, cathodic protection [CP]). The chapter contains also the methods of applying cathodic protection in grounding grids, anode selection, anode spacing, and impressed current in the grounding grid cathodic protection. Finally it contains the required information for design grounding system cathodic protection and sacrificial anode (galvanic) cathodic protection system design steps.

Influence of Reinforcement Placement on the Creep of Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 130-135 ◽  
Author(s):  
Wei Lin ◽  
Jia Ping Liu ◽  
Jian Zhong Liu
Keyword(s):  
Reinforced Concrete ◽  
Stress Relaxation ◽  
Significant Influence ◽  
Creep Property ◽  
Reinforcement Ratio ◽  
Firm Structure ◽  
Concrete Mixtures ◽  
Designed Experiment ◽  
The Difference ◽  
As Stress

The creep of the concrete might cause comprehensive effect on the structure, such as stress redistribution and pre-stress relaxation. To better understanding the significant influence of the creep on the structure, the restriction of the reinforcement should be taken into account. In this paper, the creep of reinforced concrete was studied based on designed experiment with different concrete mixtures and reinforcement configurations. And Dischinger model was used to analysis the experiment results. It was found that, with the increasing of reinforcement ratio, the creep of all concretes could be reduced with a trend that the difference of the creep property between concrete mixtures would be delaminated by the reinforcement. And suggestion was proposed to modify the Dischinger model to better consider the influence of firm structure formed by rebar.

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