Engineering behaviour of soil materials on the corrosion of mild steel

Ismail, A. I. M.; El-Shamy, A. M.

doi:10.1016/j.clay.2008.03.003

Cited by 114 publications

(69 citation statements)

References 10 publications

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“…In 1979, research showed a direct correlation between the mass loss in pipework and the moisture content of soils [48]. In 2015, the results of a study to evaluate the effect of soil moisture on corrosion confirmed its important influence on corrosion rates [51].…”

Section: Presence Of Watermentioning

confidence: 84%

“…Chlorides may be present in soils naturally or come from external sources, such as the spillage of salt on roads in winter. The concentration of chloride ions is prone to significant variations depending on the degree of soil moisture [48,64]. As for the corrosive effect produced by sulfate ions on metals, it is lower than chlorides.…”

Section: Ions Contentmentioning

confidence: 99%

“…Despite these contradictions, The finer soil particles are considered the worst corrosive medium for buried steel structures. The mineral content of clay absorbs more water because it has more surface, so it is highly effective in the deterioration of metals [47][48][49].…”

Section: Phmentioning

confidence: 99%

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Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Arriba-Rodriguez

Balsera

Fernández

et al. 2018

Metals

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Around the world, there are thousands of metal structures completely or partially buried in the soil. The main concern in their design is corrosion. Corrosion is a mechanism that degrades materials and causes structural failures in infrastructures, which can lead to severe effects on the environment and have direct impact on the population health. In addition, corrosion is extremely complex in the underground environment due to the variability of the local conditions. The problem is that there are many methods to its evaluation but none have been clearly established. In order to ensure the useful life of such structures, engineers usually consider an excess thickness that increases the economic cost of manufacturing and does not satisfy the principles of efficiency in the use of resources. In this paper, an extended revision of the existing methods to evaluate corrosion is carried out to optimize the design of buried steel structures according to their service life. Thus, they are classified into two categories depending on the information they provide: qualitative and quantitative methods. As a result, it is concluded that the most exhaustive methodologies for estimating soil corrosion are quantitative methods fed by non-electrochemical data based on experimental studies that measure the mass loss of structures.

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Section: Presence Of Watermentioning

confidence: 84%

Section: Ions Contentmentioning

confidence: 99%

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Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Arriba-Rodriguez

Balsera

Fernández

et al. 2018

Metals

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“…The main factors influencing the corrosiveness of the soil are: aeration, resistivity, presence of ions (chlorides and sulfates), moisture, pH and microorganism activity [22][23][24][25]. Among those factors, Balestra et al [11] state that resistivity is a parameter indicating the corrosiveness of the soil, obtained by means of field tests.…”

Section: Characterization Of the Soil As An Aggressive Medium Regardimentioning

confidence: 99%

Effect of corrosion degree on mechanical properties of reinforcements buried for 60 years

Balestra

Lima

Mendes

et al. 2018

Rev. IBRACON Estrut. Mater.

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ResumoThis paper studies the influence of the corrosion degree calculated by the mass loss and by the smaller diameters on the yield strength, ultimate strength and final elongation. Reinforcements buried and naturally corroded for 60 years were studied. The mechanical properties of the protruding reinforcing steel were compared to reference bars, which also remained buried for 60 years, but without going through the corrosion process. Micrographs, besides the chemical composition and the characterization of the aggressiveness of the soil were realized. The micrographs and the chemical composition show the presence of pits in the reinforcements and sulfur contents for steel above the prescriptions of the time when the foundations were initially implement, respectively. The results also show that the effects of pitting corrosion on the mechanical properties of the naturally corroded bars may not be adequately expressed by the mass loss. This type of corrosion (pits) produces geometric variations in the cross sections along the length of the test specimens, generating stress gradients between successive sections. This has a noticeable impact on the mechanical properties of the reinforcements. In general, the effects of corrosion are more pronounced on the ductility of the reinforcement. Regarding the aggressiveness of the soil, high corrosion rates were identified in the reinforcement, even with the soil being classified as essentially non-corrosive.Keywords: reinforcement corrosion, durability, mass loss, smallest diameter, corrosion degree, mechanical properties.Este artigo estuda a influência do grau de corrosão, calculado pela perda de massa e pelos menores diâmetros, sobre a resistência ao escoamento, limite de resistência e alongamento final em armaduras corroídas naturalmente. Essas armaduras permaneceram enterradas por 60 anos. As propriedades mecânicas das armaduras de espera foram comparadas às de barras de referência, que também permaneceram enterradas por 60 anos, mas sem sofrer o processo de corrosão. Foram realizadas micrografias, além da determinação da composição química e da caracterização da agressividade do solo onde as armaduras estavam enterradas. As micrografias e a composição química mostram a presença de pites nas armaduras e teores de enxofre acima das prescrições recomendadas para o aço na época de execução das fundações, respectivamente. Os resultados também mostram que os efeitos da corrosão por pites sobre as propriedades mecânicas das barras corroídas naturalmente podem não ser adequadamente expressos pela perda de massa. Esse tipo de corrosão (pites) produz variações geométricas nas seções transversais ao longo do comprimento dos corpos de prova, gerando gradientes de esforços entre seções sucessivas, que impactam de forma notória sobre suas propriedades mecânicas. De uma maneira geral, os efeitos da corrosão são mais pronunciáveis sobre a ductilidade das barras. Com relação à agressividade do solo, altas velocidades de corrosão foram identificadas nas armaduras, mesmo com o...

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“…Electrical resistivity data have a threefold intention: to identify external corrosion threat on buried facilities [3][4][5][6]; identify ore bodies, depth to bedrock and other geological processes [7] and for groundwater resources and environmental protection and management. The combination of thickness and resistivity of the overburden rock into single variables known as Dar Zarrouk parameters [8,9] can be used as a plinth for a proper estimation of the safety condition of aquifers as well as the protection of groundwater resources in any environment [6,10,11].…”

Section: Introductionmentioning

confidence: 99%