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Related Concept Videos

Corrosion of Reinforcement01:27

Corrosion of Reinforcement

215
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
215
Porosity in Cement Paste01:18

Porosity in Cement Paste

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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
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Hydration of Cement01:24

Hydration of Cement

287
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
287
Sulfate Attack on Concrete01:29

Sulfate Attack on Concrete

186
Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
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3D Multi-Ion Corrosion Model in Hierarchically Structured Cementitious Materials Obtained from Nano-XCT Data.

Krzysztof Szyszkiewicz-Warzecha1, Jakub Stec1, Jan Deja1

  • 1Faculty of Materials Science and Ceramics, AGH-University of Krakow, al. Mickiewicza 30, 30-059 Krakow, Poland.

Materials (Basel, Switzerland)
|July 29, 2023
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Summary

This study introduces a novel method using 3D X-ray computed tomography (XCT) and finite element method (FEM) to accurately model rebar corrosion in concrete. This approach provides a more realistic assessment of ion transport and degradation in reinforced concrete structures.

Keywords:
3D corrosion modelcorrosion of reinforcementhierarchical concrete structuremulti-ion transportnano-XCT based geometryreal 3D concrete microstructure

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Electrochemistry

Background:

  • Steel reinforcement corrosion in concrete is a significant global issue.
  • Current models often simplify concrete's heterogeneous microstructure, affecting transport coefficient accuracy.
  • Accurate modeling requires understanding ion transport and electric potential within the concrete matrix.

Purpose of the Study:

  • To develop a more realistic model for assessing rebar degradation in reinforced concrete.
  • To investigate ion movement and electrochemical reactions using a detailed 3D concrete microstructure.
  • To improve the evaluation of currents responsible for reinforcement mass loss.

Main Methods:

  • Obtained real 3D concrete microstructure using high-resolution X-ray computed tomography (XCT).
  • Processed XCT data to create a mesh for finite element method (FEM) computations.
  • Implemented a multi-species transport and electric potential equation system within the FEM framework.

Main Results:

  • The methodology allows for a realistic description of ion movements and reactions.
  • Enables a better evaluation of anodic and cathodic currents driving rebar corrosion.
  • Results provide a more accurate prediction of reinforcement mass loss and its location.

Conclusions:

  • The integrated XCT-FEM approach offers a superior method for analyzing rebar corrosion in concrete.
  • This technique enhances the understanding of degradation mechanisms in heterogeneous materials.
  • The findings contribute to more reliable structural health monitoring and durability assessments.