scholarly journals Corrosion Detection of Structural Reinforcement Based on Artificial Intelligence Technology

2022 ◽  
Vol 2152 (1) ◽  
pp. 012041
Author(s):  
Hong Fei ◽  
Zifu Hu
Keyword(s):  
Material Selection ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Detection Methods ◽  
Chemical Attack ◽  
Structural Reinforcement ◽  
Prone Area ◽  
Relationship Model ◽  
Artificial Intelligence Technology ◽  
Piping Erosion

Abstract Due to the environmental degradation caused by soil erosion, it is of great significance to establish the relationship model between geological environmental factors and piping erosion. The method to determine the prone area of pipeline corrosion is limited. This paper introduces the mechanism of reinforcement corrosion, points out the non-destructive detection methods of common steel corrosion, and puts forward the measures to prevent and maintain the corrosion of reinforcement from the aspects of design, construction and material selection, so as to prolong the service life of concrete structure. Abrasion, capitation and chemical attack in concrete hydraulic structures can lead to deterioration of spillways, stilling basins, chutes, slabs and transverse joints, concrete blocks under sluices and any irregular surfaces affected by high flow rates. There are numerous coatings on the market that can be used to repair damaged surfaces. However, the basic data provided by the manufacturer is very limited, and if so, it is usually limited to room temperature values. The results show that the data of concrete, corrosion solution and chloride ion are 0.534, 0.673 and 0.384 respectively.

scholarly journals Investigation of Corrosion Rate and Rust Expansion Form of Segment Reinforcement for Shield Tunnel by Combined Action of Soil Loading, Chloride Ion and Stray Current

2021 ◽  
Vol 13 (6) ◽  
pp. 3444
Author(s):  
Zheng Li ◽  
Hao Jin ◽  
Shuo Yu
Keyword(s):  
Corrosion Rate ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Shield Tunnel ◽  
Uniform Corrosion ◽  
Stray Current ◽  
Soil Loading ◽  
Capacity Degradation ◽  
Expansion Form ◽  
Combined Action

Segment reinforcement corrosion can cause bearing-capacity degradation of shield tunnel, which is unsafe for the metro operation. Therefore, a three-dimensional computational model was proposed in this paper to study the corrosion rate and rust expansion form of segment reinforcement by the combined action of soil loading, chloride ion and stray current. The results show that the arch waist segment steel corrosion rate in the middle is larger than the ends. The rust expansion form of segment reinforcement appears be an eccentric circle. The radius size and circular center are related to the non-uniform corrosion coefficient and the maximum corrosion current density.

scholarly journals Relationship model between surface strain of concrete and expansion force of reinforcement rust

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fanxiu Chen ◽  
Zuquan Jin ◽  
Endong Wang ◽  
Lanqin Wang ◽  
Yudan Jiang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Real Time ◽  
Steel Corrosion ◽  
Surface Strain ◽  
Concrete Cracking ◽  
Whole Process ◽  
Steel Bars ◽  
Relationship Model ◽  
Expansion Force ◽  
Corrosion Of Steel

AbstractConcrete cracking caused by corrosion of reinforcement could significantly shorten the durability of reinforced concrete structure. It remains critical to investigate the process and mechanism of the corrosion occurring to concrete reinforcement and establish the theoretical prediction model of concrete expansion force for the whole process of corrosion cracking of reinforcement. Under the premise of uniform corrosion of reinforcing steel bars, the elastic mechanics analysis method is adopted to analyze the entire process starting from the corrosion of steel bars to the cracking of concrete due to corrosion. A relationship model between the expansion force of corrosion of steel bars and the surface strain of concrete is established. On the cuboid reinforced concrete specimens with square cross-sections, accelerated corrosion tests are carried out to calibrate and verify the established model. The model can be able to estimate the real-time expansion force of reinforced concrete at any time of the whole process from the initiation of steel corrosion to the end of concrete cracking by measuring the surface strain of concrete. It could be useful for quantitative real-time monitoring of steel corrosion in concrete structures.

Effect of Chlorine Concentration on Determining COD by Acid and Alkaline Potassium Permanganate

2013 ◽  
Vol 807-809 ◽  
pp. 232-235 ◽  
Author(s):  
Mo Di E ◽  
Tao Ding ◽  
Sheng Chao Zhan ◽  
Fu Wei Yao ◽  
Hong Ke Wan
Keyword(s):  
Potassium Permanganate ◽  
Water Body ◽  
Potassium Dichromate ◽  
Chloride Ion ◽  
Chlorine Concentration ◽  
Detection Methods ◽  
Tidal Period ◽  
Freshwater Sample ◽  
Standard Solution ◽  
The Difference

In water monitoring, effect of chloride ion in water body on determining COD can not be ignored. Potassium dichromate has a strong oxidizing, and it can oxidize most of the organic in matter. But it generally is used to determine the water body which COD is larger than 30mg/L, and easily influenced by Chloride ion. So we often use alkaline potassium permanganate method which has weak impact by Chloride ion in high chlorine concentration wastewater. For the tidal estuary, we often use acidic potassium permanganate method in upstream and alkaline potassium permanganate method in downstream. The different detection methods cause the disagreement of water quality evaluation. This paper describes the influence of chlorine level on the COD standard solution prepared by laboratory and river freshwater sample from Qiantang River upstream in detail, and analyses the difference between the acid potassium permanganate method and alkaline potassium permanganate by comparing the COD standard solution prepared by laboratory and the freshwater sample. Last, this paper discusses the variation of COD during a tidal period.

scholarly journals INFLUENCE OF CHLORIDE ION CONCENTRATION AND STRESS ON STEEL CORROSION IN CEMENT PASTE GROUT

2009 ◽  
Vol 65 (1) ◽  
pp. 103-117 ◽  
Author(s):  
Yosuke AZUMA ◽  
Shinichi MIYAZATO ◽  
Kyoji NIITANI ◽  
Kazuo YAMADA ◽  
Toyoaki MIYAGAWA
Keyword(s):  
Cement Paste ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Ion Concentration

Anaerobic Corrosion of Reinforcement

2013 ◽  
Vol 569-570 ◽  
pp. 1124-1131 ◽  
Author(s):  
Ross O’Donovan ◽  
Brian D. O’Rourke ◽  
Kieran D. Ruane ◽  
John Justin Murphy
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Product ◽  
Steel Corrosion ◽  
Electrochemical Process ◽  
Steel Reinforcement ◽  
Detection Methods ◽  
Anaerobic Corrosion ◽  
The Subject ◽  
Corrosion Of Steel

Anaerobic corrosion of steel reinforcement is rarely reported and limited literature is available on the subject. Corrosion of steel is an electrochemical process requiring a supply of oxygen in the presence of moisture. Steel corrosion product usually occupies a much larger volume than the un-corroded steel resulting in cracked or spalled concrete. If the supply of oxygen is restricted, black rust may be formed by the process of anaerobic corrosion. Black rust is not expansive, which makes it particularly difficult to detect in reinforced concrete. This paper presents a case study of anaerobic corrosion in the Mizen Bridge, together with an in-depth review of anaerobic corrosion of reinforcement in concrete, outlining black rust formation, characteristics and detection methods.

scholarly journals FUNDAMENTAL STUDY ON CHLORIDE ION DIFFUSION AND STEEL CORROSION IN SILICA FUME CONCRETE

2011 ◽  
Vol 65 (1) ◽  
pp. 360-367
Author(s):  
Shinichi KAWAHARA ◽  
Tatsuhiko SAEKI ◽  
Tsuyoshi SHIMA ◽  
Hironori YOSHIZAWA
Keyword(s):  
Silica Fume ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Ion Diffusion ◽  
Fundamental Study ◽  
Chloride Ion Diffusion

scholarly journals Preliminary Assessment of 22Cr and 15Cr Materials Selection for CO2 Enhanced Oil Recovery Program

2019 ◽  
Vol 269 ◽  
pp. 03014
Author(s):  
Harris Prabowo ◽  
Yudha Pratesa ◽  
Reza M. Ulum ◽  
Badrul Munir ◽  
Johny W. Soedarsono
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Material Selection ◽  
Selection Process ◽  
Oil Production ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Materials Selection ◽  
Fluid Analysis ◽  
Chloride Environment

Enhanced Oil Recovery (EOR) program to increase oil production from mature fields are now being implemented in Indonesia amid concern over the continuous decrease of oil production level. The mature fields and EOR process have the tendency to carry relatively high impurities components (CO2, H2S, chloride ions) that results in early corrosion occurrence, creating damages in the subsurface equipment (wellhead, tubing, Xmas tree, etc). In Java area with 0.09 TSCF potential gas reserves, 49.3 MMSTB oil and + 23% CO2 content, such amount of CO2 gas and possibility of H2S and chloride from the reservoir will require a higher grade material than the conventional carbon steel. This paper discuss the preliminary materials selection process in the program plan based on the existing condition. The material selection based on the evaluation of closest field data, literature review as a comparison, material, and fluid analysis test. Duplex 22Cr-15 Cr materials are the main study in the paper as the candidate for the tubing material in high CO2, high H2S and chloride environment. The polarization result in 27°C and 50°C showed that the chrome 22 %Cr material had pitting tendency in chloride ion 25,000 ppm, while at high temperature (80 °C) the pitting tendency shifted to 5,000 ppm of chloride ion.

scholarly journals Numerical Modeling of Steel Corrosion in Concrete Structures due to Chloride Ion, Oxygen and Water Movement

2003 ◽  
Vol 1 (2) ◽  
pp. 147-160 ◽  
Author(s):  
Tsuyoshi Maruya ◽  
Kailin Hsu ◽  
Hitoshi Takeda ◽  
Somnuk Tangtermsirikul
Keyword(s):  
Numerical Modeling ◽  
Water Movement ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
Chloride Ion

Influences of Climate Change on Reliability of Bridge Superstructure

2011 ◽  
Vol 94-96 ◽  
pp. 1549-1555 ◽  
Author(s):  
Hui Bing Xie ◽  
Yuan Feng Wang ◽  
Ming Hui Liu
Keyword(s):  
Climate Change ◽  
Global Climate ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Extreme Weather Events ◽  
Base Case ◽  
Highway Bridge ◽  
Analysis Model ◽  
Wind Speeds ◽  
Bridge Superstructure

Global climate change, including climate deterioration and extreme weather events, has serious impacts on reliability of bridge superstructure. Global warming and increasing velocity of wind associate with the increase of CO2 level play a dominate role in reliability degradation. For the highway bridge in offshore environment, a main factor of reinforcing steel corrosion is the invasion of chloride ion, which can cause durable damage of the structures. Moreover, temperature rises will increase corrosion rates. In addition, changes in maximum wind speeds may increase expected wind loads on bridge structures. This paper develops a reliability analysis model to assess the reliability degradation of the highway bridge superstructure under (i) base case, (ii) temperature rising case, (iii) wind speed changing case, and (iv) combination of case (ii) and case (iii). The process is illustrated by studying the reliability of a offshore highway bridge using simplified models of the structure. It is demonstrated that the reliability degradation will be greatly accelerated taking account of climate change. The life expectancy of the structure will be 10 years and 70 years lower than base case if the target reliability is 4.5.

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