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nonsteady state chloride diffusion in concrete with

nonsteady state chloride diffusion in concrete with

Non-steady state chloride diffusion in concrete with ...

2012-7-3  Non-steady state chloride diffusion was experimentally studied on concrete samples with artificial cracks, prepared by a notch method. Different crack numbers

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Non-steady state chloride diffusion in concrete with ...

present study investigates non-steady state chloride diffusion in concrete samples with different crack densities prepared by a non-destructive notch method.

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Non-steady state chloride diffusion in concrete with ...

The present study investigates non-steady state chloride diffusion in concrete samples with different crack densities prepared by a non-destructive notch method. The relationship between diffusion coefficient and crack density is discussed.

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Non-steady state chloride diffusion in concrete with ...

Nevertheless, in real concrete structures, multiple cracks instead of a single crack are most commonly observed. The present study investigates non-steady state chloride diffusion in concrete samples with different crack densities prepared by a non-destructive notch method.

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CHLORIDE-BINDING ISOTHERMS IN CONCRETE

2020-9-21  state chloride diffusion coefficients for concrete. It was discov-ered that the chloride diffusion coefficients were depended on time and depth/concentration and were expressed as a linear function of the Boltzmann variable. Tang (1999) showed clearly that the effective chloride diffusion

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Non-steady-state chloride diffusion coefficients

The complexity of the process of chloride penetration in concrete makes it difficult to define a standard procedure in order to calculate diffusion coeffic Non-steady-state chloride diffusion coefficients obtained from migration and natural diffusion tests.

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Absorption, Porosity, Capillarity and Chloride Diffusion ...

2019-11-6  concrete. The results show that UHPCs have remarkably lower water permeability than CC, with the water absorption and water porosity being in the order of 8 times lower, the water absorption by capillarity being in the order of 30 times lower, and the nonsteady-state chloride migration coefficient more than 100 times - inferior.

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Analysis of chloride diffusivity in concrete containing ...

Keywords: concrete, red mud, chloride diffusion, ... and to estimate the diffusion coefficient in steady-state conditions, as suggested by ANDRADE ‎[15]. More recently, sev-eral authors have used migration tests to calculate the diffusion coefficient in nonsteady-state conditions [16, 17]. Depending on

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Simulation of Chloride Diffusion in Cracked Concrete

Using experimental results of chloride penetration depth, the apparent chloride diffusion coefficient of sound concrete is calibrated as 3.3 −12 m 2 /s, which is in the range for concretes and mortars made with the different cementitious systems (from 1 −12 to 5 −11 m 2 /s). The contour of free chloride concentration and chloride penetration depth at 8 weeks and 20 weeks are shown in ...

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The Correlation of Chloride Diffusion Coefficient and ...

2020-10-13  The influence of curing ages on chloride diffusion coefficient of concrete under standard curing condition is given in Figure 1. figure 1. Influence of curing ages on concrete chloride diffusion coefficient. It can be seen from Figure 1 that the chloride diffusion coefficient in concrete specimens decreases with increasing the curing days.

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Non-steady state chloride diffusion in concrete with ...

Nevertheless, in real concrete structures, multiple cracks instead of a single crack are most commonly observed. The present study investigates non-steady state chloride diffusion in concrete samples with different crack densities prepared by a non-destructive notch method.

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Boltzmann-Matano Analysis of Chloride Diffusion into ...

1996-11-1  The Boltzmann-Matano methodology was used to calculate the nonsteady-state chloride diffusion coefficients for blended cement concrete, which incorporated fly ash and ground granulated blast furnance slag.

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Effects on Non-Steady State Chloride Diffusion

To simulate a concrete exposed to chloride environment, this study uses a numerical solution for one-dimensional diffusion equation to solve a non-steady one-dimensional diffusion equation considering three different diffusion coefficients D(x), D(t) and D(x,t).

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CHLORIDE-BINDING ISOTHERMS IN CONCRETE

2020-9-21  state chloride diffusion coefficients for concrete. It was discov-ered that the chloride diffusion coefficients were depended on time and depth/concentration and were expressed as a linear function of the Boltzmann variable. Tang (1999) showed clearly that the effective chloride diffusion

get price

Absorption, Porosity, Capillarity and Chloride Diffusion ...

2019-11-6  concrete. The results show that UHPCs have remarkably lower water permeability than CC, with the water absorption and water porosity being in the order of 8 times lower, the water absorption by capillarity being in the order of 30 times lower, and the nonsteady-state chloride migration coefficient more than 100 times - inferior.

get price

Chloride diffusivity in red mud-ordinary portland

In the diffusion of chloride ions in concrete, nonsteady-state diffusion is the period when the transport of ions occurs in combination with its attachment to the cement phases, while steady-state diffusion is the period when the flow occurs at a constant rate (Castellote apud Santos 9).

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Analysis of chloride diffusivity in concrete containing ...

Keywords: concrete, red mud, chloride diffusion, ... and to estimate the diffusion coefficient in steady-state conditions, as suggested by ANDRADE ‎[15]. More recently, sev-eral authors have used migration tests to calculate the diffusion coefficient in nonsteady-state conditions [16, 17]. Depending on

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Analysis of chloride diffusivity in concrete containing ...

Figure 7 shows the flow of chloride ions, J Cl, through the concrete as a function of red mud content in the material. This parameter represents the speed at which the ions are transported through the concrete and from which the steady-state and nonsteady-state diffusion coefficients (Figure 8) are calculated.

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Simulation of Chloride Diffusion in Cracked Concrete

Using experimental results of chloride penetration depth, the apparent chloride diffusion coefficient of sound concrete is calibrated as 3.3 −12 m 2 /s, which is in the range for concretes and mortars made with the different cementitious systems (from 1 −12 to 5 −11 m 2 /s). The contour of free chloride concentration and chloride penetration depth at 8 weeks and 20 weeks are shown in ...

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Five-phase modelling for effective diffusion coefficient ...

2020-4-3  described the details of the chloride diffusion mechanism com-bined with hetero-structured RAC. These earlier reported experiments were also inappropriate to tackle the influences of individual components of RAC on chloride diffusion in con-crete. The analytical studies mentioned above could only focus 584 Magazine of Concrete Research Volume ...

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CHLORIDE-BINDING ISOTHERMS IN CONCRETE

2020-9-21  state chloride diffusion coefficients for concrete. It was discov-ered that the chloride diffusion coefficients were depended on time and depth/concentration and were expressed as a linear function of the Boltzmann variable. Tang (1999) showed clearly that the effective chloride diffusion

get price

Chloride diffusion in partially saturated cementitious ...

2013-11-13  Diffusion is the transport of ions caused by differences in concentration. Descriptions of the mechanism can be found elsewhere (e.g., Refs. [6,7]). For the calculations presented in the present paper, two solutions to Fick’s second law of nonsteady state diffusion are applied: (1) the ‘instant plane

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Chloride diffusivity in red mud-ordinary portland

In the diffusion of chloride ions in concrete, nonsteady-state diffusion is the period when the transport of ions occurs in combination with its attachment to the cement phases, while steady-state diffusion is the period when the flow occurs at a constant rate (Castellote apud Santos 9).

get price

Analysis of chloride diffusivity in concrete containing ...

Keywords: concrete, red mud, chloride diffusion, ... and to estimate the diffusion coefficient in steady-state conditions, as suggested by ANDRADE ‎[15]. More recently, sev-eral authors have used migration tests to calculate the diffusion coefficient in nonsteady-state conditions [16, 17]. Depending on

get price

Analysis of chloride diffusivity in concrete containing ...

Figure 7 shows the flow of chloride ions, J Cl, through the concrete as a function of red mud content in the material. This parameter represents the speed at which the ions are transported through the concrete and from which the steady-state and nonsteady-state diffusion coefficients (Figure 8) are calculated.

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Modelling chloride diffusion in concrete with

2018-6-28  Therefore, it is of vital importance to investigate the chloride diffusion model. Research reveals that the concrete stress state has great influence on chloride diffusion; therefore a stress influence coefficient was incorporated in chloride diffusion

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A reply to the discussion by L. Tang and L.-O. Nilsson

A complement to the discussion of A. Xu∗ and S. Chandra∗ about the paper “Calculation of chloride coefficient diffusion in concrete from ionic migration measurements” by C. Andrade∗∗ A reply to the discussion by S. Chatterji of the paper “permeability, diffusivity, and microstructural parameters: A

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Simulation of Chloride Diffusion in Cracked Concrete

Using experimental results of chloride penetration depth, the apparent chloride diffusion coefficient of sound concrete is calibrated as 3.3 −12 m 2 /s, which is in the range for concretes and mortars made with the different cementitious systems (from 1 −12 to 5 −11 m 2 /s). The contour of free chloride concentration and chloride penetration depth at 8 weeks and 20 weeks are shown in ...

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Modified chloride diffusion model for concrete under

2018-3-30  D 0, D t 0 and D 10 are the mean diffusion coefficients of chloride ion on the cross section, when the concrete specimen with non-stress, exposed in the chloride salt environment for a reference time t 0, and eroded by chloride salt coupling with simple bending load lasting for 1a, respectively.

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Five-phase modelling for effective diffusion coefficient ...

2020-4-3  described the details of the chloride diffusion mechanism com-bined with hetero-structured RAC. These earlier reported experiments were also inappropriate to tackle the influences of individual components of RAC on chloride diffusion in con-crete. The analytical studies mentioned above could only focus 584 Magazine of Concrete Research Volume ...

get price