interface in the tension zone which expedites chloride diffusion. On the contrary, a reduction in the porosity of the concrete in the compression zone may impede chloride diffusion. In practice, structural concrete with crack widths within a specified limit is considered to have .

The crack factor was introduced to consider the effect of initial crack. The apparent chloride diffusion coefficient of concrete at 28 d in Group B (wet-dry ratio 1 : 7) was obtained by and the ratio of this apparent chloride diffusion coefficient between cracked concrete and uncracked concrete …

[13] ISMAIL M, TOUMI A, FRAN OIS R, et al. Effect of crack opening on the local diffusion of chloride in inert materials[J]. Cement and Concrete Research, 2004, 34(4): 711-716. [14] ISMAIL M, TOUMI A, FRAN OIS R, et al. Effect of crack opening on the local diffusion of chloride …

This study investigates the effects of transverse cracks on chloride diffusion and the corrosion behavior of two types of steel bars (low carbon steel and corrosion resistant steel) in fly ash concrete with 1 kg/m 3 solution-polymerized super absorbent polymer. Electrochemical impedance spectroscopy was used to monitor the chloride-induced ...

To predict long-term chloride concentrations in the re- A 28 days in water at 208C 0.5 0.007 B 1.1 205.85 pair materials, the time dependence of the diffusion coeffi- C 0.7 0.782 cient Dc needs to be incorporated in Fick's second law of Concrete 0.6 0.076 diffusion [13], which, in its general form, is given by the A 28 days in air at 208C ...

Jan 01, 2011· The main test variable in this study is the crack width at unloaded state. This is to find out the effect of crack width on the diffusion. The crack widths were selected ranging from 0 to 200 μm.The other test variables include compressive strength, addition of fly ash and maximum aggregate size in order to explore the effects of these parameters on the diffusion coefficients of cracked ...

2.1 Methods to induce cracks in concrete To study the chloride transport properties of cracked concrete, cracks have to be generated in a concrete specimen. There are two main methods to introduce cracks in concrete. The first is to mimic cracks by saw-cutting (Rodriguez and Hooton, 2003) or by putting a plate as

Feb 21, 2018· This study is focused on the evaluation of crack and time effect on chloride diffusion rate. Two types of concrete strength grade were taken for nuclear power plant construction and the crack was induced with varying from 0.05 to 1.35 mm of width. The tests for chloride diffusion coefficients from steady-state condition were performed.

Andrade et al. [] proposed an approach to use the electrical resistivity of concrete to represent porosity and pore connectivity in modelling chloride penetration into concrete.This approach also considers the effect of concrete age on reduction of the coefficient of chloride diffusion. Farahani et al. [] developed a model for estimating the service life of RC structures under chloride ...

2.2 Chloride diffusivity in concrete crack . Djerbi et al. (2008) presented the chloride diffusion coefficient through the crack that is . For, 30 μ m ≤ w ≤ 80 μ m 𝑟 = 2 × 10−11 −4 × 10−10. For, w ≥ 80 μ m 𝑟 = 14 × 10−10 (9) Where, „ w ‟ is the crack width. Later, Wang . et al

This study is focused on the evaluation of crack and time effect on chloride diffusion rate. Two types of concrete strength grade were taken for nuclear power plant construction and the crack was induced with varying from 0.05 to 1.35 mm of width.

The cracks in concrete are a fast transport path for chlorides and influence the service life of concrete structures in chloride environments. This study aimed to reveal the effect of crack geometry on chloride diffusion in cracked concrete. The chloride diffusion process in cracked concrete was simulated with the finite difference method by solving Fick's law.

Jun 25, 2021· the chloride diffusion process in cracked concrete was simulated. The apparent chloride diffusivity in concrete cracks with different geometries was calculated, and the effect of crack geometry on the chloride diffusion in cracked concrete was discussed. 2. Simulation Methods 2.1. Numerical Method

Crack and Time Effect on Chloride Diffusion Coefficient in Nuclear Power Plant Concrete with 1 Year Curing Period November 2017 Journal of the Korea institute for structural maintenance inspection ...

This study is focused on the evaluation of crack and time effect on chloride diffusion rate. Two types of concrete strength grade were taken for nuclear power plant construction and the crack was ...

Aug 28, 2020· The effects of the transverse crack width, water-cement ratio, and the length of the wetting-drying cycle on the distribution of the free chloride concentration, the cross-sectional loss of the tensile steel bars, and the chloride diffusion coefficient are analyzed.

Effect of crack number on chloride penetration is shown in Figure 6. Figure 6 (a) shows geometry model. Crack width is 0.3 mm, crack depth is 10 mm, the distance between two cracks is 10 mm, and exposure period is 20 weeks. Figure 6 (b) shows the meshing of cracked concrete with two equal-width cracks.

Jun 01, 2008· This study examined the effects of traversing cracks of concrete on chloride diffusion. Three different concretes were tested: one ordinary concrete (OC) and two high performance concretes with two different mix designs (HPC and HPCSF, with silica fume) to show the influence of the water/cement ratio and silica fume addition.

Feb 21, 2018· where C s is the surface chloride concentration, C t is the chloride threshold, x is the cover depth, D c is the chloride diffusion coefficient and t is the time to initiation.. A graphical representation of Fick's second law can be seen in Fig. 1. This clearly identifies the surface chloride concentration, which is the chloride concentration at a depth of zero, and the chloride threshold ...

Jul 15, 2016· With increasing loading, their transport significantly increases due to development of micro cracks, and it still increases to the time when crack width is open to about 0.4 mm, . Recently the effect of crack on chloride diffusion has been actively studied …

Under the effect of load and over time, cracks occur in the structure, significantly reducing its performance and durability. ... Chloride diffusion coefficients of concrete were evaluated using a ...

The above formula is used derived for chloride ingress in crack free concrete; however cracking ... investigation of the chloride diffusion diffusivity in ... The effect of the cracks on

May 14, 2019· T. Luping and J. Gulikers, "On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete," Cement and Concrete Research, vol. 37, no. 4, pp. 589–595, 2007. View at: Publisher Site | Google Scholar

Apr 11, 2018· Under the effect of load and over time, cracks occur in the structure, significantly reducing its performance and durability. Therefore, a number of models for predicting the penetration of chloride ions into the concrete were proposed to assess the durability of the structure.

interface in the tension zone which expedites chloride diffusion. On the contrary, a reduction in the porosity of the concrete in the compression zone may impede chloride diffusion. In practice, structural concrete with crack widths within a specified limit is considered to have .

The crack factor was introduced to consider the effect of initial crack. The apparent chloride diffusion coefficient of concrete at 28 d in Group B (wet-dry ratio 1 : 7) was obtained by and the ratio of this apparent chloride diffusion coefficient between cracked concrete and uncracked concrete …

[13] ISMAIL M, TOUMI A, FRAN OIS R, et al. Effect of crack opening on the local diffusion of chloride in inert materials[J]. Cement and Concrete Research, 2004, 34(4): 711-716. [14] ISMAIL M, TOUMI A, FRAN OIS R, et al. Effect of crack opening on the local diffusion of chloride …

This study investigates the effects of transverse cracks on chloride diffusion and the corrosion behavior of two types of steel bars (low carbon steel and corrosion resistant steel) in fly ash concrete with 1 kg/m 3 solution-polymerized super absorbent polymer. Electrochemical impedance spectroscopy was used to monitor the chloride-induced ...

To predict long-term chloride concentrations in the re- A 28 days in water at 208C 0.5 0.007 B 1.1 205.85 pair materials, the time dependence of the diffusion coeffi- C 0.7 0.782 cient Dc needs to be incorporated in Fick's second law of Concrete 0.6 0.076 diffusion [13], which, in its general form, is given by the A 28 days in air at 208C ...

Jan 01, 2011· The main test variable in this study is the crack width at unloaded state. This is to find out the effect of crack width on the diffusion. The crack widths were selected ranging from 0 to 200 μm.The other test variables include compressive strength, addition of fly ash and maximum aggregate size in order to explore the effects of these parameters on the diffusion coefficients of cracked ...

2.1 Methods to induce cracks in concrete To study the chloride transport properties of cracked concrete, cracks have to be generated in a concrete specimen. There are two main methods to introduce cracks in concrete. The first is to mimic cracks by saw-cutting (Rodriguez and Hooton, 2003) or by putting a plate as

Feb 21, 2018· This study is focused on the evaluation of crack and time effect on chloride diffusion rate. Two types of concrete strength grade were taken for nuclear power plant construction and the crack was induced with varying from 0.05 to 1.35 mm of width. The tests for chloride diffusion coefficients from steady-state condition were performed.

Andrade et al. [] proposed an approach to use the electrical resistivity of concrete to represent porosity and pore connectivity in modelling chloride penetration into concrete.This approach also considers the effect of concrete age on reduction of the coefficient of chloride diffusion. Farahani et al. [] developed a model for estimating the service life of RC structures under chloride ...

2.2 Chloride diffusivity in concrete crack . Djerbi et al. (2008) presented the chloride diffusion coefficient through the crack that is . For, 30 μ m ≤ w ≤ 80 μ m 𝑟 = 2 × 10−11 −4 × 10−10. For, w ≥ 80 μ m 𝑟 = 14 × 10−10 (9) Where, „ w ‟ is the crack width. Later, Wang . et al

This study is focused on the evaluation of crack and time effect on chloride diffusion rate. Two types of concrete strength grade were taken for nuclear power plant construction and the crack was induced with varying from 0.05 to 1.35 mm of width.

The cracks in concrete are a fast transport path for chlorides and influence the service life of concrete structures in chloride environments. This study aimed to reveal the effect of crack geometry on chloride diffusion in cracked concrete. The chloride diffusion process in cracked concrete was simulated with the finite difference method by solving Fick's law.

Jun 25, 2021· the chloride diffusion process in cracked concrete was simulated. The apparent chloride diffusivity in concrete cracks with different geometries was calculated, and the effect of crack geometry on the chloride diffusion in cracked concrete was discussed. 2. Simulation Methods 2.1. Numerical Method

Crack and Time Effect on Chloride Diffusion Coefficient in Nuclear Power Plant Concrete with 1 Year Curing Period November 2017 Journal of the Korea institute for structural maintenance inspection ...

This study is focused on the evaluation of crack and time effect on chloride diffusion rate. Two types of concrete strength grade were taken for nuclear power plant construction and the crack was ...

Aug 28, 2020· The effects of the transverse crack width, water-cement ratio, and the length of the wetting-drying cycle on the distribution of the free chloride concentration, the cross-sectional loss of the tensile steel bars, and the chloride diffusion coefficient are analyzed.

Effect of crack number on chloride penetration is shown in Figure 6. Figure 6 (a) shows geometry model. Crack width is 0.3 mm, crack depth is 10 mm, the distance between two cracks is 10 mm, and exposure period is 20 weeks. Figure 6 (b) shows the meshing of cracked concrete with two equal-width cracks.

Jun 01, 2008· This study examined the effects of traversing cracks of concrete on chloride diffusion. Three different concretes were tested: one ordinary concrete (OC) and two high performance concretes with two different mix designs (HPC and HPCSF, with silica fume) to show the influence of the water/cement ratio and silica fume addition.

Feb 21, 2018· where C s is the surface chloride concentration, C t is the chloride threshold, x is the cover depth, D c is the chloride diffusion coefficient and t is the time to initiation.. A graphical representation of Fick's second law can be seen in Fig. 1. This clearly identifies the surface chloride concentration, which is the chloride concentration at a depth of zero, and the chloride threshold ...

Jul 15, 2016· With increasing loading, their transport significantly increases due to development of micro cracks, and it still increases to the time when crack width is open to about 0.4 mm, . Recently the effect of crack on chloride diffusion has been actively studied …

Under the effect of load and over time, cracks occur in the structure, significantly reducing its performance and durability. ... Chloride diffusion coefficients of concrete were evaluated using a ...

The above formula is used derived for chloride ingress in crack free concrete; however cracking ... investigation of the chloride diffusion diffusivity in ... The effect of the cracks on

May 14, 2019· T. Luping and J. Gulikers, "On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete," Cement and Concrete Research, vol. 37, no. 4, pp. 589–595, 2007. View at: Publisher Site | Google Scholar

Apr 11, 2018· Under the effect of load and over time, cracks occur in the structure, significantly reducing its performance and durability. Therefore, a number of models for predicting the penetration of chloride ions into the concrete were proposed to assess the durability of the structure.