time and crack effect on chloride diffusion for concrete

Time and Crack Effect on Chloride Diffusion for Concrete ...

effect of crack and time on diffusion is proposed for nuclear power plant concrete. Keywords: nuclear power plant concrete, crack, chloride diffusion, steady-state condition, time effect. 1. Introduction Concrete is an attractive construction material which has

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Time and Crack Effect on Chloride Diffusion for Concrete ...

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.

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Time and cold joint effect on chloride diffusion in ...

Apr 10, 2018  For evaluation of crack effect on chloride diffusion in steady and non-steady conditions, several relationships between crack width and changing diffusion coefficient have been proposed , , , . In this work, the enlarged diffusion of chloride was modeled with a function of basic diffusion in crack width and diffusion in sound concrete, so ...

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Influence of traversing crack on chloride diffusion into ...

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.

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Influence of cracks on chloride diffusivity in concrete: A ...

Feb 10, 2019  Du et al. developed a four-phase mesoscale model consisting of the cement paste, aggregates, ITZ and cracks to study the effect of the artificial cracks and the tortuous cracks on chloride ions diffusion in cracked concrete, and found that the chloride diffusivity in cracked concrete was affected by the depth and width of the crack.

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Effect of Transverse Crack on Chloride Penetration into ...

of apparent chloride diffusion coefficient in the early cracked concrete was proposed by simply considering the effect of crack width, shown in Equation (5). Park, Kwon, and Jung (2012) evaluated the crack effect on chloride diffusion in splitting cylinder concrete by non-steady-state migration test and proposed an analytical

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Influence of cracks on chloride diffusivity in concrete: A ...

Feb 10, 2019  Du et al. developed a four-phase mesoscale model consisting of the cement paste, aggregates, ITZ and cracks to study the effect of the artificial cracks and the tortuous cracks on chloride ions diffusion in cracked concrete, and found that the chloride diffusivity in cracked concrete was affected by the depth and width of the crack.

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Cracking effects on chloride diffusion and corrosion ...

Chloride ion ingress into concrete causes steel corrosion over time, thereby ending the service life of structures. Sometimes, it severely reduces the loading capacity of reinforced concrete and may even cause the sudden destruction of concrete structures. Concrete cracking stems from different factors, such as shrinkage and tensile stress due to thermal loading and under loading.

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Effect of Transverse Crack on Chloride Penetration into ...

of apparent chloride diffusion coefficient in the early cracked concrete was proposed by simply considering the effect of crack width, shown in Equation (5). Park, Kwon, and Jung (2012) evaluated the crack effect on chloride diffusion in splitting cylinder concrete by non-steady-state migration test and proposed an analytical

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Simulation of Chloride Diffusion in Cracked Concrete with ...

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.

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Effect of Chloride Attack on Durability of Concrete ...

v. Chlorides may also enter by diffusion from atmosphere. Earlier Bureau of Indian Standards had recommended the maximum content of chloride in cement as 0.05%, but now it has been increased to 0.1%. The revised IS-456-2000 has specified the chloride content as chlorine (CI), in concrete at the time of placing as shown Table 17.11.

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Effects of cold joint and loading conditions on chloride ...

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

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INFLUENCE OF CRACKS ON CHLORIDE PENETRATION IN

first part of the test program consists of concrete specimens with artificial cracks. In the next step, concrete with real cracks will be studied. In this paper, the influence of different crack widths and crack depths of artificial cracks on the chloride diffusion is investigated. In order to study

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Effect of crack opening on the local diffusion of chloride ...

Cement and Concrete Research 38 (2008) 1106–1111 Contents lists available at ScienceDirect Cement and Concrete Research j o u r n a l h o m e p a g e : h t t p : / / e e s . e l s e v i e r. c o m / C E M C O N / d e f a u l t . a s p Effect of crack opening on the local diffusion of chloride in cracked mortar samples M. Ismail a,b,⁎, A. Toumi c, R. François a, R. Gagné b a Laboratoire ...

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Chloride diffusion study in different types of concrete ...

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

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Finite Element Analysis of 2-D Chloride Diffusion Problem ...

Fig. 1: Effect of transverse crack . 2.3 Time-dependent Diffusion Coefficient . The other part of the paper focuses on the implementation of time-dependent diffusion coefficient based on the model [3]. The time-dependent effect allows modeling the increase of concrete resistance against the chloride

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Prediction of Time to Crack Reinforced Concrete by ...

The factors considered for this analysis are w/c, bar diameter, and cover depth. The analysis is accomplished by using Minitab statistical software, and it showed that cover depth is the significant effect on the time to crack the concrete from chloride induced corrosion than other factors considered.

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Chloride Resistance of Concrete

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 .

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Mesoscale Modelling of the Chloride Diffusion in Cracks ...

mental methods to evaluate the effect of cracking on the chloride diffusion property of concrete, as well as the diffusion features of chlorides in a single crack (Aldea et al. 1999; Samaha and Hover 1992; Gowripalan . et al 2000; Ismail . 2004, 2008; Rodriguez and Hooton et al 2003; Kim et al. 2010). In the tests, cracks were created

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The effect of crack width on chloride threshold reaching ...

Jan 29, 2020  In this study, the effects of changes in the surface chloride concentration and crack width have been simultaneously investigated. To estimate the corrosion occurrence in cracked reinforced concrete members, various samples with different crack widths were modelled and the finite element method was used to model chloride ingress into the concrete.

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Cracking effects on chloride diffusion and corrosion ...

Chloride ion ingress into concrete causes steel corrosion over time, thereby ending the service life of structures. Sometimes, it severely reduces the loading capacity of reinforced concrete and may even cause the sudden destruction of concrete structures. Concrete cracking stems from different factors, such as shrinkage and tensile stress due to thermal loading and under loading.

get price

Simulation of Chloride Diffusion in Cracked Concrete with ...

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.

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Prediction of Time to Crack Reinforced Concrete by ...

The factors considered for this analysis are w/c, bar diameter, and cover depth. The analysis is accomplished by using Minitab statistical software, and it showed that cover depth is the significant effect on the time to crack the concrete from chloride induced corrosion than other factors considered.

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Chloride diffusion study in different types of concrete ...

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

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Effect of crack opening on the local diffusion of chloride ...

Cement and Concrete Research 38 (2008) 1106–1111 Contents lists available at ScienceDirect Cement and Concrete Research j o u r n a l h o m e p a g e : h t t p : / / e e s . e l s e v i e r. c o m / C E M C O N / d e f a u l t . a s p Effect of crack opening on the local diffusion of chloride in cracked mortar samples M. Ismail a,b,⁎, A. Toumi c, R. François a, R. Gagné b a Laboratoire ...

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INFLUENCE OF CRACKS ON CHLORIDE INGRESS

Concentration of chlorides at distance x and time t, % mass of concrete Chloride surface concentration, % mass of concrete Enor function Apparent chloride diffusion coefficient, m2/s Flow of chloride ions, mole/s*m2 Effective chloride diffusion coefficient, m2/s Thickness of the specimen, m

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Mesoscale Modelling of the Chloride Diffusion in Cracks ...

mental methods to evaluate the effect of cracking on the chloride diffusion property of concrete, as well as the diffusion features of chlorides in a single crack (Aldea et al. 1999; Samaha and Hover 1992; Gowripalan . et al 2000; Ismail . 2004, 2008; Rodriguez and Hooton et al 2003; Kim et al. 2010). In the tests, cracks were created

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INFLUENCE OF CRACKS ON CHLORIDE PENETRATION IN

first part of the test program consists of concrete specimens with artificial cracks. In the next step, concrete with real cracks will be studied. In this paper, the influence of different crack widths and crack depths of artificial cracks on the chloride diffusion is investigated. In order to study

get price

Finite Element Analysis of 2-D Chloride Diffusion Problem ...

Fig. 1: Effect of transverse crack . 2.3 Time-dependent Diffusion Coefficient . The other part of the paper focuses on the implementation of time-dependent diffusion coefficient based on the model [3]. The time-dependent effect allows modeling the increase of concrete resistance against the chloride

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Chloride Resistance of Concrete

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 .

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The Effect of Crack Width on Chloride-Induced Corrosion of ...

Jul 19, 2017  When subjected to loading or thermal shrinkage, reinforced concrete structures usually behave in a cracking state, which raises the risk of bar corrosion from the working environment. The influence of cover cracking on chloride-induced corrosion was experimentally investigated through a 654-day laboratory test on cracked reinforced concrete specimens exposed to chloride solution.

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Effect of Crack Self-Healing on Concrete Diffusivity ...

Jun 06, 2020  Crack and DZ sizes varied as a function of time. Distribution of the chloride concentration in cracks and DZs during self-healing and the influence of self-healing rate on chloride concentration distribution, as well as that of the ITZ and DZ on chloride concentration distribution, are analyzed and discussed.

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Effect of Cracking on Corrosion of Steel in Concrete ...

Jan 30, 2018  The effect of depths of parallel-wall cracks on chloride diffusion of concretes with different w/c ratios is also studied by Stitmannaithum et al. , where increase in chloride diffusion with increase in crack depth and w/c ratios is also reported (see Fig. 6). While no corrosion test results on the effect of widths of parallel-face cracks are ...

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Chloride Attack on Concrete Structures - Cause and ...

This will decrease the durability and the time, cost of expensive repairs. Chloride Content Limit in Concrete Structures The chloride content limit is the amount of chloride that must be present in concrete along with oxygen and moisture in order to facilitate corrosion. Table-1 below shows the ACI 318-95 code limits of water soluble chlorides.

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