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Related Concept Videos

Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

319
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
319
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

248
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
248
Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

239
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
239
Pore Size Distribution01:23

Pore Size Distribution

246
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.
Adequate...
246
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

281
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
281
Aggregate Cement Ratio01:21

Aggregate Cement Ratio

382
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
382

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Related Experiment Video

Updated: Oct 27, 2025

Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way
07:42

Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way

Published on: November 21, 2017

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Analytical Solution for Chloride Diffusivity of Concrete with Aggregate Shape Effect.

Jian Zhang1, Zhuo-Xuan Ying1, Zhi-Wei Chen2

  • 1Jiyang College, Zhejiang Agriculture and Forestry University, Zhuji 311800, China.

Materials (Basel, Switzerland)
|July 24, 2021
PubMed
Summary

This study presents an analytical solution to accurately determine concrete's chloride diffusivity, considering aggregate shape. The model accurately predicts chloride diffusion, crucial for assessing concrete durability.

Keywords:
aggregate shapeanalytical solutionchloride diffusivityconcrete

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Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ
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Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Chemical Engineering

Background:

  • Chloride diffusivity is critical for concrete durability assessment.
  • Accurate determination of this parameter requires effective approaches.
  • Existing models often simplify or ignore aggregate shape's influence.

Purpose of the Study:

  • To develop an analytical solution for concrete chloride diffusivity that incorporates aggregate shape.
  • To establish a mesoscale model reducing concrete to two phases: equivalent aggregates and cement paste.
  • To validate the model's accuracy against experimental data.

Main Methods:

  • Simulating aggregate shape as an ellipse and applying an equivalent model.
  • Utilizing the generalized Maxwell's approach for mesoscale concrete.
  • Conducting chloride diffusion tests and SEM analysis to determine ITZ thickness (0.04 mm).

Main Results:

  • The analytical solution accurately predicts chloride diffusivity compared to experimental data.
  • Concrete's chloride diffusivity decreases with increased aggregate content.
  • Reduced aggregate aspect ratio also leads to decreased chloride diffusivity.

Conclusions:

  • The proposed analytical solution effectively accounts for aggregate shape in chloride diffusivity calculations.
  • Aggregate shape significantly impacts concrete's resistance to chloride ingress.
  • This model provides a more accurate tool for predicting concrete durability.