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Permeability of Concrete

Concrete Durability and Water Penetration

Description

Concrete durability depends partly on how easily water and gases can move through it. This property, called permeability, is important for judging water-tightness and resistance to chemical attack in concrete structures.

Permeability is measured with comparative lab tests. In a typical test, the ...

Transcript

渗透性是指液体或气体通过混凝土的难易程度。这一特性对于确保蓄液结构的不透水性以及抵抗化学侵蚀具有重要意义。

通过一种基础的实验室测试来评估混凝土的渗透性,该测试中除混凝土试样顶部外,其余各面均被密封,然后对顶面施加压力水。

当达到稳态时(可能需要约十天),记录在特定时间内透过一定厚度混凝土的渗水量。

对于由标准普通重量集料组成的混凝土,其渗透性由水泥浆体的孔隙率决定。

水化水泥浆体的渗透性不仅取决于凝胶内部的小孔径,还受到较大毛细孔存在的影响。

随着水化进程的进行,水泥浆体的渗透性降低,因为原本充满水的部分空间被封闭。

在较低的水灰比下(通常低于0.6),毛细孔隙会变得分段或断裂,阻碍流体流动,从而降低...

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