Characteristic analysis of concrete air entraining agents in different media

被引：36

作者：

Ke, Guoju ^{[1
]}

Zhang, Jun ^{[1
]}

Tian, Bo ^{[2
]}

Wang, Jiliang ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China

[2] Highway Minist Transport, Res Inst, Beijing 100088, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2020年 / 135卷 / 135期

基金：

中国国家自然科学基金;

关键词：

Air entraining agent; Inflection point concentration; Cement paste foam drainage; High-frequency vibration; Bubble structure; CEMENT; SURFACTANTS;

D O I：

10.1016/j.cemconres.2020.106142

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The effects of six concrete air-entraining agents (AEAs) in different media, including saturated calcium hydroxide solution, cement paste, mortar, fresh concrete, and hardened concrete (subjected to different vibration treatments), were compared. The results show that the lower the AEA concentration is at the surface tension inflection point of a saturated calcium hydroxide solution, the less AEA is needed to obtain the same air content in the concrete. Similarly, AEAs with better air-entraining performance lead to a higher initial cement paste foam height and a lower mortar density. The differences between the air content of fresh concrete and hardened concrete are large; high-frequency vibration can significantly optimize the bubble space of low-slump concrete.

引用

页数：7

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