相关实验视频

Updated: Jul 15, 2025

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ
08:59

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ

Published on: December 16, 2019

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纳米SiO2含量对水泥糊和界面过渡区的影响

Shaofeng Zhang1,2,3, Ronggui Liu2, Chunhua Lu2

  • 1School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China.

Materials (Basel, Switzerland)
|September 28, 2023
PubMed
概括

将纳米 (NS) 添加到水泥糊中可以改善机械性能和界面过渡区 (ITZ). 在1%的NS含量下观察到最佳结果,在因聚合而下降之前,弹性模量增加了70%以上.

关键词:
在ITZ的厚度.数字图像相关性相关性数字图像相关性弹性模块 弹性的模块接口过渡区接口过渡区纳米-SiO2 的含量.

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Transition Zone01:28

Transition Zone

The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
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Porosity in Cement Paste01:18

Porosity in Cement Paste

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.
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Pore Size Distribution

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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