scholarly journals Modeling and computational homogenization of chloride diffusion in three-phase meso-scale concrete

2021 ◽  
Vol 271 ◽  
pp. 121558
Author(s):  
Nele Pollmann ◽  
Fredrik Larsson ◽  
Kenneth Runesson ◽  
Karin Lundgren ◽  
Kamyab Zandi ◽  
...  
Keyword(s):  
Computational Homogenization ◽  
Chloride Diffusion ◽  
Three Phase ◽  
Meso Scale

scholarly journals Lattice Modelling of the Onset of Concrete-Ice Abrasion

2016 ◽  
Vol 711 ◽  
pp. 351-358 ◽  
Author(s):  
Nathalie Ramos ◽  
Guzel Shamsutdinova ◽  
Max A.N. Hendriks ◽  
Stefan Jacobsen
Keyword(s):  
Numerical Model ◽  
Degradation Mechanism ◽  
Concrete Surface ◽  
Hertzian Contact ◽  
Contact Theory ◽  
The Arctic ◽  
Three Phase ◽  
Interface Transition Zone ◽  
Hertzian Contact Theory ◽  
Meso Scale

The last decades the concrete-ice abrasion process has been well known as a concrete surface degradation mechanism due to ice sliding. The topic is especially relevant for concrete gravity based structures in the Arctic offshore. The article presents a numerical model in which the onset of wear in the concrete-ice abrasion process is simulated. The simulations are performed on meso-scale, which means that concrete is modelled as a three-phase material in which paste, aggregates and the interface transition zone are distinguished. Lattice modelling is adopted for the numerical modeling. Hertzian contact theory which predicts excessive tensile stresses on the concrete surface due to sliding of ice asperities is used as an analytical basis for the numerical model. It was concluded that such model is able to capture both surface and subsurface cracking in the concrete.

Numerical Analysis of Combined Aggregate Concrete from the Meso-Scale Level

2014 ◽  
Vol 584-586 ◽  
pp. 1229-1232
Author(s):  
Yan Kun Zhang ◽  
Shu Shan Zhao ◽  
Tie Jun Qu ◽  
Hai Ying Wu
Keyword(s):  
Finite Element ◽  
Monte Carlo ◽  
Composite Material ◽  
Lightweight Aggregate ◽  
Element Model ◽  
Scale Level ◽  
Aggregate Concrete ◽  
The Monte Carlo Method ◽  
Three Phase ◽  
Meso Scale

In the paper , the combined aggregate concrete is regarded as a three-phase composite material based on the meso-scale level, it consists of lightweight aggregate, ordinary aggregate and mortar. According to Fuller’s grading curve, the number of aggregate with different size could be obtained. And the randomly aggregates model is generated base on the Monte Carlo method. APDL program is developed to generate finite element model of combined aggregate concrete, On the basis, the stress characteristics of combined aggregate concrete is studied.

Influence of Recycled Aggregates Volume Fraction on Chloride Diffusion in Model Recycled Aggregates Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 151-155
Author(s):  
Jing Wei Ying ◽  
He Gong Chen
Keyword(s):  
Finite Element ◽  
Volume Fraction ◽  
Chloride Concentration ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Chloride Diffusion ◽  
Aggregate Fraction ◽  
Three Phase ◽  
Wide Range ◽  
Cylindrical Inclusions

In this paper, the influence of recycled aggregates volume fraction (Fra) on chloride induced permeability of recycled aggregates concrete (RAC) was investigated. Finite element analyses of single modeled RAC with regular aggregate arrangements were performed. The recycled aggregate fraction (Fra ) was varied between 0.38 and 0.63. The finite element method (FEM) were based on a mass diffusion approach in which RAC were simplified as three-phase cylindrical inclusions with 1 mm thickness. The analysis results were interpreted by change of permeability. The results show that the chloride concentration on the corresponding boundary vary wavely in a wide range from from 0.00196603 (mg/mm3) to 0.00238315 (mg/mm3) and increase entirely with the increasing Fra due to the influence of old adhered mortar. The effective chloride diffusivities of RAC and the value of chloride amount increase linearly with the increasing Fra.

Effect of Interfacial Transition Zone on Chloride Diffusion Coefficient

2006 ◽  
Vol 302-303 ◽  
pp. 167-174
Author(s):  
Jia Jin Zheng ◽  
Shi Lang Xu ◽  
Xin Zhu Zhou
Keyword(s):  
Diffusion Coefficient ◽  
Transition Zone ◽  
Annular Plate ◽  
Interfacial Transition Zone ◽  
Area Fraction ◽  
Chloride Diffusion ◽  
Thick Wall ◽  
Chloride Diffusion Coefficient ◽  
Three Phase ◽  
Circle Model

A three-phase composite circle model is presented in this paper to assess the effect of interfacial transition zone (ITZ) on the chloride diffusion coefficient of concrete. Firstly, the distribution of circular aggregate particles was simulated in a square concrete element. Based on the simulated concrete mesostructure, the Monte Carlo algorithm was adopted to numerically evaluate the ITZ area fraction for different concrete mixes. A parametric study was then conducted to quantify the effects of the largest aggregate diameter, ITZ thickness and aggregate gradation on the ITZ area fraction. Secondly, the ITZ was modeled as a thin-wall annular plate located between a circular aggregate particle and a thick-wall cement paste annular plate. With the three-phase composite circle model, an analytical solution was derived for the chloride diffusion coefficient of concrete. Finally, the derived solution was verified by experimental results obtained from the research literature and a quantitative relationship between the thickness and chloride diffusion coefficient of ITZ was established.

scholarly journals Computational homogenization of diffusion in three-phase mesoscale concrete

2014 ◽  
Vol 54 (2) ◽  
pp. 461-472 ◽  
Author(s):  
Filip Nilenius ◽  
Fredrik Larsson ◽  
Karin Lundgren ◽  
Kenneth Runesson
Keyword(s):  
Computational Homogenization ◽  
Three Phase
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