Verification method for durability of reinforced concrete structures subjected to salt attack under high temperature conditions

Matsumura, Takuro; Shirai, Kohji; Saegusa, Toshiari

doi:10.1016/j.nucengdes.2007.03.032

Cited by 27 publications

(11 citation statements)

References 2 publications

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“…There are several formulations available in the literature for determining the coefficient of diffusion, D 0 . The assessment of this coefficient accounts for the following parameters: the w/c ratio, aggregate/cement (a g /c) ratio, specific mass of aggregates (r g ) and specific mass of cement (r c ) (Papadakis et al [26]; Matsumura et al [18]). In the present study, the model pro-posed by Bentz et al [7] is utilized for determining the coefficient of diffusion.…”

Section: Chloride Diffusion Into Concrete Poresmentioning

confidence: 99%

“…The bending moment provided by R C and R S , named resistant bending moment (M R ), must be equal to the applied bending moment, M, to assure the equilibrium. Therefore: (15) Once z = d -0.4x, the Equations (13) and (14) are rewritten, which enables writing Equation (15) as follows: (16) The solution of Equation (16) enables determining the neutral axis as follows: (17) The reinforcements' cross-section area is evaluated using the Equations (17) and (14), which results: (18) Finally, the resistant bending moment for a rectangular cross-section with reinforcements' cross-section area known, is determined as follows:…”

Section: Figurementioning

confidence: 99%

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Numerical approach about the effect of the corrosion on the mechanical capacity of the reinforced concrete beams considering material nonlinear models

Pellizzer

Leonel

Nogueira³

2018

Rev. IBRACON Estrut. Mater.

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Every structure is subjected to the effects of time and environment on which they are located. The consideration of these effects and their consequences in design phase is called nowadays as durability analysis of the structural system. The corrosion of the reinforcement steel through the chloride penetration inside the concrete is the main cause of the lifetime deterioration of the reinforced concrete structures. As a direct consequence, the corrosion affects the resistant capacity of the structural elements as the process evolves over time. Therefore, the appropriate prediction of the structural lifetime depends directly of the prevision capacity of those effects over the behavior of the structural systems. In this work, a mechanical model that combines the corrosion effects over the reinforcement and the concrete and steel material nonlinear responses is proposed to predict the resistant loss of reinforced concrete beams over the time. The steel and concrete nonlinear behavior was modeled by model based on unidimensional plasticity theory and damage mechanics, respectively. The Fick’s laws and empirical methods based on the Faraday’s laws were used to represent chloride penetration inside concrete and reinforced degradation, respectively. A simplified process was adopted to simulate the corrosion beginning in different times over the structure. The results showed that the rate of loss resistant capacity of the analyzed beam is higher in the first years after the beginning of corrosion and tend to stabilized in subsequent years. Furthermore, the structural behavior is very sensitive regarding the considered corrosive effects in the analyses.

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Section: Chloride Diffusion Into Concrete Poresmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Numerical approach about the effect of the corrosion on the mechanical capacity of the reinforced concrete beams considering material nonlinear models

Pellizzer

Leonel

Nogueira³

2018

Rev. IBRACON Estrut. Mater.

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“…Qi et al [17] analyzed the variation of chloride diffusion coefficient with temperature using the Nernst-Einstein equation and then established the diffusion coefficient equation in the function of temperature. Matsumura et al [18] found that the chloride diffusion coefficient became larger with higher temperature, and the logarithm of diffusion coefficient was linearly related to the reciprocal of temperature. Environmental RH influences the process of chloride transport and further impacts the transport rate and corrosion depth of chloride in concrete.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

Zhang

Wang

Ling

et al. 2021

Advances in Materials Science and Engineering

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Marine atmosphere environment accelerates the process of chloride penetration into concrete under the coupling effect of ambient temperature and relative humidity, thereby reducing the durability and service life of concrete. This paper aims to investigate the change of water equilibrium saturation and the chloride transport properties of concrete materials in different environments. The water equilibrium saturation tests at three temperatures and five relative humidity (RH) and salt spray erosion tests at three temperatures were performed. The influence of RH and temperature on the equilibrium saturation of concrete and the influence of temperature and time on the chloride diffusion coefficient are investigated. The results show that, in the process of moisture absorption and desorption, the equilibrium saturation of concrete gradually decreases as temperature rises. At the same depth of concrete, the chloride content gradually increases with temperature increasing, as well as the chloride diffusion coefficient. However, as the corrosion time of salt spray increases, the altering of chloride diffusion coefficient becomes less. Based on the Kelvin equation, a relationship between capillary pressure and water saturation in concrete was established, and a moisture transfer model for concrete in the process of moisture absorption and desorption was derived. Further, based on the established chloride diffusion equation and heat balance equation, a model of temperature-wet-chloride coupling chloride transfer was derived. Theory model simulation results show the transfer speed of chloride under the coupling of diffusion and capillary is higher than pure diffusion in moisture in the absorption process. However, the opposite is true in the desorption process. Moreover, with the increment of saturation rate, the capillary effect on chloride transport is enhanced.

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“…Domestic and foreign scholars have done a lot of research on damage accumulation and performance deterioration of concrete material under temperature-humidity, but most of their works focus on the deterioration of concrete material under freeze-thaw cycles [11][12][13][14][15][16][17], the interaction of freeze-thaw cycles and other factors [18][19][20][21][22], or high-temperature environments [23][24][25][26][27][28]. In fact, besides the long-term uninterrupted freeze-thaw cycles or high temperature effects in special service environments, most concrete is subjected to cyclic moisture-heat effects determined by the local natural environment.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Dynamic Elastic Modulus of Concrete under Periodic Temperature-Humidity Action

et al. 2020

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Cracks caused by environmental temperature and humidity variation are generally considered one of the most important factors causing durability deterioration of concrete structures. The seasonal or daily variation of ambient temperature and humidity can be considered periodic. The dynamic modulus of elasticity is an important parameter used to evaluate the performance of structural concrete under periodic loads. Hence, in this paper, the dynamic elastic modulus test of concrete under simulating periodic temperature-humidity variation is carried out according to monthly meteorological data of representative areas (Nanjing, China). The dynamic elastic modulus attenuation pattern and a dynamic elastic modulus degradation model of concrete under periodic temperature-humidity are investigated. The test results show that the dynamic elastic modulus of concrete decreases and tends to be stable under the action of periodic temperature-humidity. Comparative analysis shows that the two-parameter dynamic elastic modulus degradation model is more suitable for describing the dynamic elastic modulus attenuation pattern of concrete under periodic temperature-humidity action than the single-parameter one.

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Verification method for durability of reinforced concrete structures subjected to salt attack under high temperature conditions

Cited by 27 publications

References 2 publications

Numerical approach about the effect of the corrosion on the mechanical capacity of the reinforced concrete beams considering material nonlinear models

Numerical approach about the effect of the corrosion on the mechanical capacity of the reinforced concrete beams considering material nonlinear models

Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

Degradation of Dynamic Elastic Modulus of Concrete under Periodic Temperature-Humidity Action

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