a new diffusion model of sulfate ions in concrete

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A new diffusion model of sulfate ions in concrete ...

2013-2-1  This paper has presented an experimental study on the diffusion of sulfate ions in concrete. Based on the experimentally obtained results, a new diffusion model of sulfate ions in concrete has been developed, which takes into account the influence of the evolution of sulfate-induced damage on the diffusion of sulfate ions.

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A new diffusion model of sulfate ions in concrete ...

Based on the experimentally obtained results, a new diffusion model for sulfate ions was developed, taking into account the influence of the evolution of sulfate-induced damage on the diffusion of ions. The evolution of damage with immersion time and concentration of sulfate ions

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A new diffusion model of sulfate ions in concrete ...

In this paper, an experimental study was performed on the diffusion of sulfate ions in concrete. Based on the experimentally obtained results, a new diffusion model for sulfate ions was developed,...

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A new diffusion model of sulfate ions in concrete ...

Sulfate attack is one of the major durability problems in concrete structures. Sulfate ions present in concrete can react with cement hydration products to form gypsum and ettringite, and this may affect the pore structure and cause structural damage. In this paper, an experimental study was performed on the diffusion of sulfate ions in concrete.

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A new diffusion model of sulfate ions in concrete - 道客巴巴

2015-10-19  内容提示: A new diffusion model of sulfate ions in concreteChao Suna, Jiankang Chena,b,⇑, Jue Zhua, Minghua Zhanga, Jian YecaThe Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, ChinabState Key Laboratory of Turbulence and Complex Systems, Beijing 100871, ChinacDepartment of Water Resources, Jiangsu Province, Nanjing 210029,

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(PDF) Sulfate Diffusion in Concrete

A chemomechanical mathematical model is presented to simulate the response of concrete exposed to external sulfate solutions. The model is based on the diffusion-reaction approach, and several ...

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Effect of Erosion Damage on Diffusion of Sulfate Ions in ...

Based on Fick’s second law and the damage evolution due to sulfate attack, a new model is proposed to analyze the diffusion of sulfate ions in concrete. The relation between erosion damage and...

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Modeling diffusion coefficient of sulfate ion in concrete ...

A mesoscopic physical model of concrete subjected to external sulfate attack is presented. • A stochastic equation of sulfate ions diffusion coefficient is proposed. • The effects of randomness from multi-factors are comprehensively discussed. • The probability density functions of the diffusion coefficient can be conveniently obtained.

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Modeling diffusion coefficient of sulfate ion in concrete ...

2019-8-10  In order to confirm the effectiveness of the stochastic model of the diffusion coefficient (Eq. ), the experiments conducted by Hui Xu are employed in the study. In these experiments, some 100 m m × 100 m m × 100 m m cubes of concrete were immersed in a known concentration of sulfate solution after 14 or 28 days of curing. To find the relationship between the diffusion coefficient and ...

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Modeling of diffusion-reaction behavior of sulfate ion in ...

This paper estimates theoretically the diffusion-reaction behaviour of sulfate ion in concrete caused by environmental sulfate attack. Based on Fick's second law and chemical reaction kinetics, a ...

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A new diffusion model of sulfate ions in concrete - 道客巴巴

2015-10-19  内容提示: A new diffusion model of sulfate ions in concreteChao Suna, Jiankang Chena,b,⇑, Jue Zhua, Minghua Zhanga, Jian YecaThe Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, ChinabState Key Laboratory of Turbulence and Complex Systems, Beijing 100871, ChinacDepartment of Water Resources, Jiangsu Province, Nanjing 210029,

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Effect of Erosion Damage on Diffusion of Sulfate Ions in ...

Based on Fick’s second law and the damage evolution due to sulfate attack, a new model is proposed to analyze the diffusion of sulfate ions in concrete. The relation between erosion damage and erosion time, as well as the concentration of sulfate ions is firstly investigated by virtue of the ultrasonic experimental results. Furthermore, the damage evolution is treated as the increase of ...

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Modeling of diffusion-reaction behavior of sulfate ion in ...

This paper estimates theoretically the diffusion-reaction behaviour of sulfate ion in concrete caused by environmental sulfate attack. Based on Fick's second law and chemical reaction kinetics, a ...

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Modeling diffusion of sulfate through concrete using ...

2015-12-31  Concrete exposed to sulfates deteriorates. Here, an attempt is made to see whether the framework of mixture theory can be used to model the changes that occur in concrete exposed to sodium sulfate. Toward this, diffusion and reaction of sulfates with concrete is modeled within the framework of mixture theory. Appropriate choices are made for the Helmholtz free energy and interaction

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Model for Sulfate Diffusion Depth in Concrete under ...

3. A Time-Varying Model for Sulfate Diffusion Depth 3.1. Time-Varying Model for Sulfate Diffusion Depth Dominated by Diffusion. Although sulfate ions can enter into concrete by many methods such as permeation, capillary adsorption, and diffusion in reality, diffusion is the main method of transportation. Thus, existing extensive experimental ...

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Experimental Study on Diffusion Process of Sulfate Ion in ...

2020-3-10  Some scholars have establishing models about diffusion coefficient. Nicola et al. used external sulfate to attack concrete structures under partially or fully saturated conditions and established a diffusion model to account for chemical and mechanical damage [15, 16].

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Modeling diffusion and reaction of sulfates with cement ...

2017-11-21  Gouder, C.: Modeling sulfate attack on cement concrete using mixture theory. Ph.D. thesis, Indian Institute of Technology Madras (2017) 9. Gouder, C., Saravanan, U.: Modeling diffusion of sulfate through concrete using mixture theory. Acta Mech. 227(11), 3123–3146 (2016) MathSciNet Article MATH Google Scholar 10.

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Experimental results of diffusion coefficient of sulfate ...

2017-1-17  sulphate resistance are the pore solution alkalinity and the water/cement ratio (Smith 1990) 2.1 Modelling the diffusion of sulphate ions Several models for sulphate attack have been proposed by researchers using approaches based on different scientific

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Effect of interfacial transition zone on the transport of ...

2018-12-20  The model predictions suggested that the concentration of sulfate ions initially increases rapidly in concrete during the first 20 days and then the rate of increase gradually decreases due to the reduction in the diffusion coefficient of ions as a result of the ettringite and gypsum formation in concrete

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Frontiers Coupled Transport of Sulfate and Chloride Ions ...

In the marine environment, reinforced concrete will suffer from chloride ion erosion and sulfate ion erosion at the same time. However, most scholars only study the interaction mechanism between chloride ion and sulfate ion, and the consideration of physical adsorption and chemical combination caused by hydration products is not perfect. Based on the law of conservation of mass, this study ...

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Experimental Study on Diffusion Process of Sulfate Ion in ...

2020-3-10  Some scholars have establishing models about diffusion coefficient. Nicola et al. used external sulfate to attack concrete structures under partially or fully saturated conditions and established a diffusion model to account for chemical and mechanical damage [15, 16].

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Modeling diffusion and reaction of sulfates with cement ...

2017-11-21  Gouder, C.: Modeling sulfate attack on cement concrete using mixture theory. Ph.D. thesis, Indian Institute of Technology Madras (2017) 9. Gouder, C., Saravanan, U.: Modeling diffusion of sulfate through concrete using mixture theory. Acta Mech. 227(11), 3123–3146 (2016) MathSciNet Article MATH Google Scholar 10.

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Establishment of a Numerical Model for Sulfate Attacked ...

Sulfate attack is one of the major durability problems of concrete structures, which is manifested by expansive cracks and deterioration of cement paste. In this study, a numerical model is proposed to predict the process of ionic diffusion into concrete under external sulfate attack. The chemical reaction and diffusion processes are considered in this model.

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Mechanisms of sulfate ionic diffusion in porous cement ...

2007-8-25  Mechanisms of sulfate ionic diffusion in porous cement based composites diffusion;sulfate attack;cement paste;corrosion;mathematcal model;numerical analysis; The paper considers a theoretical model for the study of the process of transfer of sulfate ions in saturated porous media - mineral composites. In its turn, the model treats diffusion of sulfate ions into cement based composites ...

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Prediction Model of Life Span Degradation under Sulfate ...

2020-1-11  Also, according to this model, sulfate ions cause degradation in concrete through the following 3 steps. Penetration of sulfate ions into internal concrete is dominated by diffusion. Sulfate ions expand reacting with hydrates containing aluminum inside concrete. Expansion pressure occurring inside concrete

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Modeling of ion diffusion coefficient in saturated concrete

2010-10-25  This paper utilizes the modified Davis model and the mode coupling theory, as parts of the electrolyte solution theory, to investigate the diffusivity of the ion in concrete. Firstly, a computational model of the ion diffusion coefficient, which is associated with ion species, pore solution concentration, concrete mix parameters including water-cement ratio and cement volume fraction, and ...

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Solving the Reaction-Diffusion equation based on ...

2019-12-7  Reaction-Diffusion equation is one of the most famous PDEs in engineering problems which is used as a case study in this paper. This equation is widely used for prediction of sulfate concentration in concrete during the sulfate attack process [21, 2, 16]. The one-dimensional Reaction-Diffusion equation with Dirichlet boundary condition has been ...

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SciELO - Brasil - Sodium sulfate attack on Portland cement ...

A new diffusion model of sulfate ions in concrete. Construction and Building Materials, v. 39, p. 39-45, 2013.). It is known that the coefficient changes with the advance of the cracking process; this parameter was simplified, assuming that no big losses in the results would occur.

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Numerical Simulation of the Ion Transport Behavior in ...

a diffusion reaction model of sulfate in concrete on the basis of the mixture theory framework. The model selected Helmholtz free energy and interaction momentum to simulate the diffusion of sulfate in concrete. However, the model cannot be used to predict the concentration of sulfate ion under the coupling of various environmental factors.

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A model for a long-term diffusion of multispecies in ...

2013-2-22  A model for simulating a long-term diffusion in concrete under submerged conditions has been developed. The model focuses on the interaction between cement hydrates and electrolyte solution adopting the physical properties of concrete as alternative parameters for estimating long-term diffusion. The model was verified by the large variety of long-term experimental data involving verification ...

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