Contribution for durability studies based on chloride profiles analysis of real marine structures in different marine aggressive zones

Balestra, Carlos Eduardo Tino; Reichert, Thiago Alessi; Savaris, Gustavo

doi:10.1016/j.conbuildmat.2019.02.067

Cited by 34 publications

(6 citation statements)

References 27 publications

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“…The durability of concrete in marine environments differs depending on the seawater exposure regime: atmospheric, splash, tidal, or submerged [23]. The most damaging conditions are found in the splash zone [24,25], where chloride transport is greater, oxygen is readily available [26], and sulfate attack is more important [27].…”

Section: Chemical Corrosionmentioning

confidence: 99%

Biodeterioration and Chemical Corrosion of Concrete in the Marine Environment: Too Complex for Prediction

Gaylarde,

Ortega-Morales

2023

Microorganisms

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Concrete is the most utilized construction material worldwide. In the marine environment, it is subject to chemical degradation through reactions with chloride (the most important ion), and sulfate and magnesium ions in seawater, and to biodeterioration resulting from biological (initially microbiological) activities, principally acid production. These two types of corrosions are reviewed and the failure of attempts to predict the degree of deterioration resulting from each is noted. Chemical (abiotic) corrosion is greatest in the splash zone of coastal constructions, while phenomenological evidence suggests that biodeterioration is greatest in tidal zones. There have been no comparative experiments to determine the rates and types of microbial biofilm formation in these zones. Both chemical and microbiological concrete deteriorations are complex and have not been successfully modeled. The interaction between abiotic corrosion and biofilm formation is considered. EPS can maintain surface hydration, potentially reducing abiotic corrosion. The early marine biofilm contains relatively specific bacterial colonizers, including cyanobacteria and proteobacteria; these change over time, producing a generic concrete biofilm, but the adhesion of microorganisms to concrete in the oceans has been little investigated. The colonization of artificial reefs is briefly discussed. Concrete appears to be a relatively prescriptive substrate, with modifications necessary to increase colonization for the required goal of increasing biological diversity.

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Section: Chemical Corrosionmentioning

confidence: 99%

Biodeterioration and Chemical Corrosion of Concrete in the Marine Environment: Too Complex for Prediction

Gaylarde,

Ortega-Morales

2023

Microorganisms

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“…was also taken to define the damage depth xd(t). Carlos [50] investigated actual concrete structures that had been corroded in different marine environments for longer than 50 years and found that the lowest concentration of chloride in all structures was 0.05%. Costa [51] obtained the corrosion depth of concrete when the concentration of chloride was 0.05%.…”

Section: 2 Damage Depth X D (T) and Corrosion Depth X C (T)mentioning

confidence: 99%

Prediction of Concrete Compressive Strength in Saline Soil Environments

et al. 2022

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Saline soil in Western China contains high concentrations of chloride ions, sulfate ions, and other corrosive ions, and the performance of concrete will substantially deteriorate from exposure to this environment. Therefore, it is of great significance to study and predict the concrete compressive strength in saline soil environments. In this paper, the effects of corrosion on concrete were analyzed from the aspects of surface damage, damage depth, and X-ray diffraction (XRD) of the corrosion products. The effects of corrosion were quantified by damage depth and corrosion depth. Then, considering the corrosion effects combined with Fick’s diffusion law, a time-dependent model of concrete compressive strength and a time-dependent model of damage depth were established. The results show that the deterioration of concrete gradually developed from the surface to the interior, and that the interface of the concrete specimen was equivalent to three parts: a failure zone, a filling zone, and an undisturbed zone. The results also showed that the time-varying model of concrete compressive strength proposed by the author was fully applicable, with an error of less than five percent. The service life of concrete predicted by the damage depth was found to be about 253 months (21.1 years), and the service life predicted by the time-varying compressive strength model was about 187 months (15.6 years). Both prediction results were far less than the normal concrete service life of 50 years. In addition, the long-term compressive strength of the corroded concrete was about 90% of that of the noncorroded concrete, which did not deteriorate with the corrosion time.

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“…Some studies indicate that the wind speed, being higher than 3m/s, can distribute the chloride ions to regions farther from the coast, being also influenced by the altitude, with a higher concentration of chloride ions at lower altitudes, up to 10m, but in some regions, such as Hawaii, in the USA, can reach up to 30m., There are drastic reduction of these saline materials, (Meira, 2017) above these altitudes even in places where sea waves break. It has been identified that the wind presents a more decisive factor in the transport of chlorides into the concrete than the altitude, (Balestra, 2019) and which is larger up to 100m from the coast (Moreno, et.al., 2018). Based on data from the BDMEP -Teaching and Research Weather Database, INMET, Average Wind Speed (mps) (INMET, 2018), it can be seen that over 5 years, the wind speed in Recife has not exceeded 2.75m/s, as a location of milder winds, Figure 9.…”

Section: Relative Humidity / Atmospheric Conditions For This Analysismentioning

confidence: 99%

As manifestações patológicas e os riscos dos protetores de aparelhos de ar condicionado em edificações

Silva

Monteiro

2020

Revista de la Asociación Latinoamericana de Control de Calidad,

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Diante do grande número de colapsos parciais ou totais em edificações, tem-se neste estudo a identificação das manifestações patológicas e os riscos dos suportes para aparelhos de ar condicionado de concreto armado nas edificações, os dados foram coletados por software 3D e consolidados em campo. Das 61 edificações analisadas, 48% são do modelo tipo janela, que em uma situação de degradação e queda, podem chegar ao solo com um impacto da ordem de toneladas. Em regiões litorâneas, somam-se os efeitos aceleradores da corrosão da armadura, como umidade elevada, poluição por veículos automotores e região marinha. Conclui-se que esses suportes não possuem projetos estruturais adequados, aliados a baixa qualidade e efeitos aceleradores da corrosão da armadura, tornando-os não passíveis de recuperação.

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Contribution for durability studies based on chloride profiles analysis of real marine structures in different marine aggressive zones

Cited by 34 publications

References 27 publications

Biodeterioration and Chemical Corrosion of Concrete in the Marine Environment: Too Complex for Prediction

Biodeterioration and Chemical Corrosion of Concrete in the Marine Environment: Too Complex for Prediction

Prediction of Concrete Compressive Strength in Saline Soil Environments

As manifestações patológicas e os riscos dos protetores de aparelhos de ar condicionado em edificações

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