Mesoscopic simulation of steel corrosion process in concrete and its damage to concrete cover

2014 ◽  
pp. 2764-2771
Author(s):  
Z Pan ◽  
A Chen ◽  
R Ma
Keyword(s):  
Steel Corrosion ◽  
Concrete Cover ◽  
Corrosion Process ◽  
Mesoscopic Simulation

scholarly journals Inhibitive Effect of Costus afer Extracts on Mild Steel Corrosion in Acidic Medium

2016 ◽  
Vol 7 ◽  
pp. 60-67
Author(s):  
Lebe A. Nnanna ◽  
Wisdom O. John ◽  
Tochukwu E. Esihe ◽  
Kelechi C. Denkoro ◽  
Victor I. Okparaku ◽  
...  
Keyword(s):  
Mild Steel ◽  
Room Temperature ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Steel Corrosion ◽  
Corrosion Process ◽  
Inhibition Effect ◽  
A Value ◽  
Mild Steel Corrosion ◽  
Costus Afer

Inhibition effect of Costusafer on mild steel in 0.5 M HCl was studied using gravimetric method at room temperature. It was found out that Costusafer inhibited the corrosion of mild steel in the acidic environment and that the efficiency of inhibition increased as the concentration of the inhibitor in the environment increased. The data was used to test different isotherms and it suited the Langmuir isotherm. A value of -15.995 kJmol-1 was gotten for the ∆Goads. This value showed that the extracts of Costusafer inhibited the corrosion process through physiosorption mechanism. The high value of inhibition efficiency of the extract as the concentration increased in rationalized in terms of the increase in herteroatoms, saponnins and tannins which are present in the extract.

Experimental Research on Factors Affecting Factors of Concrete Strength in Corrosion and Expanding Areas at Initial Stages of Reinforcement

2014 ◽  
Vol 1065-1069 ◽  
pp. 1174-1180
Author(s):  
Xi De Zhang ◽  
Zhen Zhou ◽  
Guo Zhu Li
Keyword(s):  
Experimental Research ◽  
Concrete Strength ◽  
Steel Corrosion ◽  
Concrete Cover ◽  
Reinforcement Corrosion ◽  
Affecting Factors ◽  
Factors Affecting

This studypaper analyzed the affecting factors affecting of strength of concrete in corrosion and expanding areas at initial stages of reinforcement corrosion by experimental resultss, and researched the transformation trend of experimental factors by difference analyzing in statistics. The results showed that the expanding force after steel corrosion remarkably influenceds the strength of concrete. At the same time, the reinforcement diameter and thickness of concrete cover also had clear influence on concrete strength when rust occurroccurrenceed. Therefore, when studying the influence of corrosion and expanding force on concrete strength, we should not only research the influence of reinforcement corrosion magnitude, but also consider other effects, such as steel diameter, thickness of concrete cover should be considered.

scholarly journals Steel Corrosion Evaluation of Basalt Fiber RPC Affected by Crack and Steel-Concrete Interface Damage Using Electrochemical Methods

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5027
Author(s):  
Hanbing Liu ◽  
Xiang Lyu ◽  
Yuwei Zhang ◽  
Guobao Luo ◽  
Wenjun Li
Keyword(s):  
Basalt Fiber ◽  
Steel Corrosion ◽  
Corrosion Process ◽  
Electrochemical Methods ◽  
Reactive Powder Concrete ◽  
Interface Damage ◽  
Steel Bars ◽  
Corrosion Behaviors ◽  
Reactive Powder ◽  
Concrete Interface

Basalt fiber (BF) is a new anti-corrosion and environmentally friendly material, which is expected to delay the corrosion process of steel bars and improve the durability of reinforced reactive powder concrete (RPC). The electrochemical method is a nondestructive testing and real-time monitoring technique used to characterize the corrosion behaviors of steel bars embedded in concrete structures. In this paper, the electrochemical technique was employed to evaluate the corrosion of steel bars embedded in basalt fiber modified reactive powder concrete (BFRPC). Besides, crack and steel-concrete interface damage (SCID) were considered as typical factors that affect steel corrosion in concrete. Thus, both reinforced fiber-free RPC and BFRPC specimens with crack and SCID were prepared for evaluating the steel corrosion behaviors by electrochemical methods. The results revealed that both crack and SCID would aggravate the steel corrosion, and the crack was the major factor that affects the corrosion process. Moreover, the excellent compactness of BFRPC and the bridging action of BF could effectively prevent the concrete cracking and steel corrosion process of concrete. Using reinforced BFRPC instead of ordinary concrete in practical projects could greatly extend the service life of steel bars.

Effect of Chloride-Induced Steel Corrosion on Working Life of Concrete Structures

2018 ◽  
Vol 272 ◽  
pp. 226-231 ◽  
Author(s):  
Ivan Hollý ◽  
Juraj Bilčík
Keyword(s):  
Pore Solution ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
Radial Pressure ◽  
Concrete Cover ◽  
Transport Infrastructure ◽  
Reinforcing Bars ◽  
Volume Increase ◽  
Volumetric Expansion ◽  
High Alkalinity

The reinforcing steel embedded in concrete is generally protected against corrosion by the high alkalinity (pH = 12.5 to 13.5) of the concrete pore solution. The structural degradation of concrete structures due to reinforcement’s corrosion has an impact on the safety, serviceability and durability of the structure. The corrosion of reinforcements in the construction of a transport infrastructure (especially bridges), parking areas, etc., is primarily initiated by chlorides from de-icing salts. When corrosion is initiated, active corrosion results in a volumetric expansion of the corrosion products around the reinforcing bars against the surrounding concrete. Reinforcement corrosion causes a volume increase due to the oxidation of metallic iron, which is mainly responsible for exerting the expansive radial pressure at the steel–concrete interface and development of hoop tensile stresses in the surrounding concrete. When this tensile stress exceeds the tensile strength of the concrete, cracks are generated. Higher corrosion rates can lead to the cracking and spalling of the concrete cover. Continued corrosion of reinforcement causes a reduction of total loss of bond between concrete and reinforcement.

Electrochemical study on carbon steel corrosion process in alkaline sour media

2002 ◽  
Vol 47 (13-14) ◽  
pp. 2149-2158 ◽  
Author(s):  
R Cabrera-Sierra ◽  
E Sosa ◽  
M.T Oropeza ◽  
I González
Keyword(s):  
Carbon Steel ◽  
Steel Corrosion ◽  
Corrosion Process ◽  
Electrochemical Study

Corrosion Behavior of Q235 Steel in Industrial Atmosphere of Tangshan City

2012 ◽  
Vol 518-523 ◽  
pp. 575-578 ◽  
Author(s):  
Bao Cai Wu ◽  
Chun Ming Liu
Keyword(s):  
Corrosion Behavior ◽  
Steel Corrosion ◽  
Sem Analysis ◽  
Corrosion Process ◽  
Q235 Steel ◽  
Polluted Atmosphere ◽  
Atmosphere Pollution ◽  
Three Stages ◽  
Ir Analysis ◽  
Industrial Atmosphere

With the deterioration of atmosphere pollution, the polluted atmosphere makes a great impact to steel materials. The corrosion behavior of Q235 in industrial atmosphere is investigated by weightlessness curve analysis, SEM analysis and IR analysis. The experimental results indicate that, the corrosion process of Q235 steel can be divided into three stages with the variation of the industrial atmosphere. And the sulphate ions derived from the sulfur dioxide make an important role in the steel corrosion.

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