Multi-Scale modeling of Structural Concrete

This paper presents a multi-scale and multi-chemo–physics platform to evaluate the lifecycle of structural concrete under environmental and mechanical impacts. Following the scheme from nanometer scale of cement hydrated with water molecule to meter scale of reinforced concrete (RC) members, the platform covers characteristic upscaling based on causality and behavioral response toward both environmental and mechanical impacts. During the process, multi-chemo–physics is incorporated to tackle the local equilibrium and global movement, where the associating impact is also considered with mesoscale cracks. With this platform, long-term structural performances are captured while the coupled durability issue is also investigated. 

https://www.sciopen.com/article_pdf/1645627575597801473.pdf

Multi-scale and multi-chemo–physics lifecycle evaluation of structural concrete under environmental and mechanical impacts

Corrosion of reinforcing bars in structural concrete is a critical deterioration issue. Corrosion could attribute to the electro-chemical reactions which are closely related to the electrical field and chemical substances. Generally, two types of corrosion are classified including the micro-cell and macro-cell corrosion depending on whether the anodic and cathodic polarization take place at the same location or not. This paper presented a numerical evaluation of macro-cell corrosion of structural concrete with integrating the electrical field and multi-ion kinetics in electrolyte. Space-averaged simulation method was adopted which allowed the analytical domain to be structural members, structures or even structure clusters instead of specific concrete-reinforcement interface. Experimental validation was also conducted with pseudo concrete materials to verify the reliability of numerical simulation where satisfied correlation was found.

Numerical simulation and experiment on the coupled effects of macro-cell corrosion and multi-ion equilibrium with pseudo structural concrete

To perform the assessment of reinforced concrete infrastructures in service, a multi-scale simulation has been developed and improved with an integrated hygro-thermal-chemo-electrical-mechanistic a...

Lifetime assessment of structural concrete – multi-scale integrated hygro-thermal-chemo-electrical-mechanistic approach and statistical evaluation

Steel corrosion is one of the damaging factors for structural concrete and has drawn engineering interest in the past decades. Macro-cell corrosion, a type of steel corrosion, is related to not only electric fields but also chemical substances of both polarized metals and electrolytes such as the concrete matrix. To investigate such multi-ion kinetics induced by macro-cell circuits, this study presents an experimental validation to build a numerical simulation platform using pseudo-concrete with which the species’ chemo-electrical profiles are dynamically measured with elapsed time to obtain evidence for broad-band verification and validation. As a key species of cementing material, the authors focus on the profiles of Ca2+ concentrations as a major cation of concrete around the positive and negative electrodes, which are significantly affected by the initial saturation of calcium hydroxide and the supply of carbon dioxide. Experiments and numerical simulation applied to concrete show satisfactory correlation to reveal the governing mechanism based on polarization and the Nernst-Plank theory with multi-ion mass equation. 

Multi-ion kinetics in pseudo-concrete electrolyte associated with macro-cell corrosion

/pdf/thermo-mechanistic-multi-scale-modeling-of-structural-5eq3ndc4og.pdf

Thermo-Mechanistic Multi-Scale Modeling of Structural Concrete at High Temperature

https://www.jstage.jst.go.jp/article/jact/19/2/19_106/_pdf

Accelerated Moisture Transport through Local Weakness of High-Strength Concrete Exposed to High Temperature

The collapse simulation of underground reinforced concrete (RC) ducts surrounded by soil foundations in a fire is conducted using multi-scale finite element analysis. The underground RC ducts are f...

Model-Based Assessment of Long-Term Serviceability and Fire Resistance for Underground Reinforced Concrete Ducts

Remaining Shear Capacity of Fire-Damaged High Strength RC Beams after Moist Curing

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Papers

Thermo-Mechanistic Multi-Scale Modeling of Structural Concrete at High Temperature

Accelerated Moisture Transport through Local Weakness of High-Strength Concrete Exposed to High Temperature

Model-Based Assessment of Long-Term Serviceability and Fire Resistance for Underground Reinforced Concrete Ducts

Remaining Shear Capacity of Fire-Damaged High Strength RC Beams after Moist Curing