Factors influencing the surface permeability of concrete and their action mechanisms

被引：0

作者：

Liu, Jun ^{[1
]}

Chen, Xiao-Chi ^{[1
]}

Xing, Feng ^{[1
]}

Tang, Kai-Feng ^{[1
]}

Pan, Dong ^{[1
]}

机构：

[1] Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen

来源：

Gongneng Cailiao/Journal of Functional Materials | 2014年 / 45卷 / 18期

关键词：

Autocalm; Fly ash; Influencing factors; Pore structure; Surface permeability index;

D O I：

10.3969/j.issn.1001-9731.2014.18.006

中图分类号：

学科分类号：

摘要：

In this paper, factors that influence the surface permeability of concrete and their action mechanisms are studied. In the experiments, concrete specimens with different mix proportions are cured under standard condition for 28 days, then their surface permeability indexes were tested by Autoclam. It was found that the water-to-cement ratio influences the surface permeability significantly. The surface permeability indexes of concretes C2 and C3 are 59% and 31% of that of concrete C1, respectively. A linear relation can be drawn between the surface permeability and the water-to-cement ratio. The incorporation of fly ash may decrease the surface permeability of concrete due to its micro-filler effect on the one hand, and may increase the surface permeability at early ages due to its hydration retardation effect. The overall influence of fly ash should be attributed to the combined effect of these two mechanisms. A fly ash replacement ratio of 15% results in lower surface permeability, as compared with the reference concrete. However, when the replacement ratio was as high as 30%, the surface permeability was comparable with that of the reference concrete.

引用

页码：18027 / 18030

页数：3

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