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Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates
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Two-Dimensional Microstructure-Based Model for Evaluating the Permeability Coefficient of Heterogeneous Construction

Jiaqi Chen1, Shujun Yu1, Wei Huang2

  • 1Department of Civil Engineering, Central South University, Changsha 410075, China.

Materials (Basel, Switzerland)
|September 9, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a microstructure model to predict concrete permeability, validated by experiments. Key factors influencing permeability include water-cement ratio, aggregate characteristics, and interfacial transition zone thickness.

Keywords:
ITZconcretefinite element modelheterogeneouspermeability coefficient

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Computational Mechanics

Background:

  • Concrete permeability is vital for structural integrity and durability.
  • Accurate prediction of permeability is essential for engineering design.
  • Existing models may not fully capture microstructural complexities.

Purpose of the Study:

  • To develop and validate a microstructure-based model for predicting concrete permeability.
  • To investigate the influence of various microstructural parameters on concrete permeability.
  • To analyze the impact of the water-cement ratio on concrete permeability.

Main Methods:

  • Development of a 2D, 3-component finite element model of concrete.
  • Incorporation of real aggregate shapes and digital image technology.
  • Utilizing the finite element method for permeability coefficient prediction.

Main Results:

  • The proposed model achieved high prediction accuracy with a 1.73% relative error.
  • Higher water-cement ratios correlate with increased concrete permeability.
  • Increased aggregate content leads to decreased permeability.

Conclusions:

  • The microstructure model accurately predicts concrete permeability.
  • Aggregate content, shape, size, and distribution significantly affect permeability.
  • Interfacial transition zone thickness and segregation impact concrete permeability.