M-T Scheme for Predicting Effective Diffusion Coefficient of Chloride Ions in Cement-based Materials

Sun, Guogang; Zhang, Jianjian; Zhang, Lijuan; Cao, Tao; Wang, Penshuo; Zhang, Ying; Yan, Na

doi:10.1007/s11595-020-2288-3

Cited by 5 publications

(7 citation statements)

References 22 publications

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“…From the main hydration product C-S-H of cement to aggregate, their size from nanometer to centimeter, the size span is relatively large, and its internal pore size can also be from nanometer to millimeter. The concrete has typical porous, multiphase, and multi-scale characteristics, and each phase has independent mechanical properties and diffusion properties [12], so the study of concrete performance also needs to use the multi-scale method.…”

Section: Representation Of Multi-scale Microstructure In Concrete Under Loadmentioning

confidence: 99%

“…The hardened cement matrix is considered as a two-phase composite material made up of the hydration product solid phase (various hydration products and unhydration particles) and the pore phase (capillary pores and microcracks), as shown in Figure 1B. It needs to be indicated that chloride is mainly diffused in the capillary pores, and only a small amount are transported in gel pores with larger pore sizes [12]. Considering the percolation threshold of pores, which will be given in the next section, the gel pores of C-S-H are also basically contained.…”

Section: Representation Of Multi-scale Microstructure In Concrete Under Loadmentioning

confidence: 99%

“…In addition, the random distribution of aggregate and the overlapping phenomenon of the ITZ around aggregate make the diffusion prediction of chloride in structural concrete have certain complexity [22]. Based on the micromechanics theory and the idea of equivalent homogenization, Sun et al [12] proposed a Mori-Tanaka scheme to predict the effective diffusion coefficient of chloride in concrete, considering the morphology characteristics of ellipsoidal aggregate. It can be expressed as…”

Section: Multi-scale Prediction Of the Diffusion Coefficient Of Chloride In Concrete Under Bending Load Diffusion Coefficient Model Of Chmentioning

confidence: 99%

“…As mentioned above, the process of chloride diffusion in concrete is essentially the migration of charged particles or molecules in the pore solution of the porous medium. In the hardened cement paste, the channels of chloride diffusion are mainly capillary pores, followed by a small amount of gel pores with slightly larger pore sizes [12]. The size and quantity of these two types of pores are related to the w/c and hydration degree of the cement.…”

Section: Diffusion Coefficient Of Chloride In Cement Matrix Pore Solution (D Cp )mentioning

confidence: 99%

“…Zhang et al [11] achieved the diffusion coefficient of the low-density and high-density C-S-H gel based on a multi-scale scheme. Based on the theory of porous medium and micromechanics, Sun et al [12] systematically established a model to predict the effective diffusion coefficient of chloride in concrete, starting from the C-S-H gel, the smallest scale unit of concrete, and ranging from the nanoscale to the microscale, mesoscale, and macroscale. This result has a very good guidance for the prediction of concrete transport performance and is also the study idea of this article.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Scale Simulation of Two-Dimensional Chloride Transport Under the Effect of Bending Load in Concrete

Zhang

Sun

et al. 2021

Front. Phys.

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Chloride transport in marine concrete under loading is the main cause of its structural deterioration. The traditional numerical simulation assumes that the coefficient of chloride transport is constant, resulting in a large deviation in the prediction results. Based on the porous medium theory, micromechanics theory, and the idea of equivalent homogenization, a multi-scale model of the effective diffusion variable coefficient of chloride transport under bending load was established, which was calculated and programmed by the numerical analysis. The results show that the prediction values of the two-dimensional variable coefficient model are basically consistent with those in the literature, and the prediction accuracy is significantly improved. In addition, the theoretical simulation proves that the bending load affects the porosity of the cement matrix, and then the diffusion coefficient of chloride is changed in concrete. The compression zone can slow down the chloride transport process, while tension zone will accelerate it. The chloride concentration under tension zone is 42.1% higher than that under compression zone when the diffusion time is 200 days and the concrete depth is 15 mm.

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Section: Representation Of Multi-scale Microstructure In Concrete Under Loadmentioning

confidence: 99%

Section: Representation Of Multi-scale Microstructure In Concrete Under Loadmentioning

confidence: 99%

Section: Multi-scale Prediction Of the Diffusion Coefficient Of Chloride In Concrete Under Bending Load Diffusion Coefficient Model Of Chmentioning

confidence: 99%

Section: Diffusion Coefficient Of Chloride In Cement Matrix Pore Solution (D Cp )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multi-Scale Simulation of Two-Dimensional Chloride Transport Under the Effect of Bending Load in Concrete

Zhang

Sun

et al. 2021

Front. Phys.

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Effect of groove angle on the residual stress and deformation of nuclear waste container cylinder body welded by plasma arc welding

Li,

Huang,

Hong

et al. 2024

Materialwissenschaft Werkst

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As an important barrier for high‐level radioactive waste transportation and deep burial disposal, the welding quality of nuclear waste container is particularly important. At present, nuclear waste container is usually manufactured by plasma arc welding. Therefore, in order to manufacture nuclear waste container parts with high quality, based on the finite element simulation software simufact welding, this paper uses a combination of numerical simulation and experimental verification to simulate the temperature field, stress field and deformation of the longitudinal weld of 316L nuclear waste container cylinder body by selecting different welding groove angles. The test results show that the groove angle of the V‐groove increases, the residual stress distribution and size increase, and the deformation increases. The stress value of the I‐shaped groove is between the V‐shaped groove angle of 30° and 45°, but the deformation is the smallest. In practical engineering applications, residual stress and deformation need to be considered comprehensive. Reasonable groove angle plays an important role in controlling residual stress and deformation after welding.

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Numerical simulation on diffusion–reaction behavior of concrete under sulfate–chloride coupled attack

Qi,

Haorui,

Lijuan

et al. 2023

Construction and Building Materials

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M-T Scheme for Predicting Effective Diffusion Coefficient of Chloride Ions in Cement-based Materials

Cited by 5 publications

References 22 publications

Multi-Scale Simulation of Two-Dimensional Chloride Transport Under the Effect of Bending Load in Concrete

Multi-Scale Simulation of Two-Dimensional Chloride Transport Under the Effect of Bending Load in Concrete

Effect of groove angle on the residual stress and deformation of nuclear waste container cylinder body welded by plasma arc welding

Numerical simulation on diffusion–reaction behavior of concrete under sulfate–chloride coupled attack

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