Three-Phase Composite Sphere Model for the Prediction of Chloride Diffusivity of Concrete

2008 ◽  
Vol 20 (3) ◽  
pp. 205-211 ◽  
Author(s):  
Jianjun Zheng ◽  
Xinzhu Zhou
Keyword(s):  
Sphere Model ◽  
Composite Sphere ◽  
Chloride Diffusivity ◽  
Three Phase

Extended Dual Composite Sphere Model for Determining Dielectric Permittivity of Andisols

2005 ◽  
Vol 69 (3) ◽  
pp. 931-931 ◽  
Author(s):  
Teruhito Miyamoto ◽  
Takeyuki Annaka ◽  
Jiro Chikushi
Keyword(s):  
Dielectric Permittivity ◽  
Sphere Model ◽  
Composite Sphere

A Numerical Method for Predicting the Chloride Diffusivity of Concrete with Interfacial Cracks

2007 ◽  
Vol 348-349 ◽  
pp. 505-508
Author(s):  
Jian Jun Zheng ◽  
Jun Ping Pu ◽  
Ke Feng Mao
Keyword(s):  
Numerical Method ◽  
Interfacial Crack ◽  
The Finite Element Method ◽  
Reasonable Accuracy ◽  
Chloride Diffusivity ◽  
Interfacial Cracks ◽  
Three Phase ◽  
Durability Assessment ◽  
Quantitative Manner ◽  
Circle Model

Due to its importance to the durability assessment of reinforced concrete structures located in a marine or de-icing salt environment, it is essential to determine the chloride diffusivity of concrete. This paper presents a numerical method for predicting the chloride diffusivity of concrete with interfacial cracks. By modeling concrete as a three-phase composite material composed of aggregate, interfacial transition zone and cement paste, a composite circle model with an interfacial crack located on the aggregate surface is constructed. The finite element method is used to solve the composite circle under a given boundary condition and the chloride diffusivity of concrete is then determined numerically. After verifying the numerical method with experimental results obtained from the literature, the effect of interfacial cracks on the chloride diffusivity of concrete is evaluated in a quantitative manner. It is found that the chloride diffusivity of concrete increases with the increase of the subtended angle of interfacial cracks. The paper concludes that the numerical method presented in this paper can predict the chloride diffusivity of concrete with reasonable accuracy.

Effect of Aggregate Shape on the Chloride Diffusivity of Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 150-153 ◽  
Author(s):  
Xin Zhu Zhou ◽  
Jian Jun Zheng ◽  
Yun Ying Liang
Keyword(s):  
Numerical Method ◽  
Transition Zone ◽  
Interfacial Transition Zone ◽  
Area Fraction ◽  
Lattice Method ◽  
Chloride Diffusivity ◽  
Ellipse Model ◽  
Three Phase ◽  
Quantitative Manner ◽  
Aggregate Shape

The effect of aggregate shape on the chloride diffusivity of concrete is studied. To represent the heterogeneity of concrete, a three-phase composite ellipse model is constructed and the relative dimensions are determined by calculating the area fraction of interfacial transition zone in a numerical manner. The height of each bar in the lattice mesh is derived analytically. The lattice method is then used to estimate the chloride diffusivity of concrete. After the validity of the numerical method is verified with experimental results, the effect of aggregate shape on the chloride diffusivity of concrete is evaluated in a quantitative manner.

Construction of a composite-sphere model for molecules of tetrahedral symmetry

2021 ◽  
pp. e1913254
Author(s):  
Franklin Ramos ◽  
Ana Ramos ◽  
Giuseppe Pellicane ◽  
Lloyd L. Lee
Keyword(s):  
Sphere Model ◽  
Tetrahedral Symmetry ◽  
Composite Sphere

Extended Dual Composite Sphere Model for Determining Dielectric Permittivity of Andisols

2005 ◽  
Vol 69 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Teruhito Miyamoto ◽  
Takeyuki Annaka ◽  
Jiro Chikushi
Keyword(s):  
Dielectric Permittivity ◽  
Sphere Model ◽  
Composite Sphere

Derivation of an n-layered composite sphere model for thermo-chemo-mechanical effective properties

PAMM ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 581-582 ◽  
Author(s):  
Christian Dammann ◽  
Rolf Mahnken ◽  
Peter Lenz
Keyword(s):  
Effective Properties ◽  
Layered Composite ◽  
Sphere Model ◽  
Composite Sphere
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