Why is there air in concrete?

被引：0
|
作者：
Hover, Ken [1 ]
机构：
[1] Cornell Univ, Ithaca, United States
来源：
Aberdeen's Concrete Construction | 1993年 / 38卷 / 01期
关键词：
Air entrainment - Bubble formation - Concrete mixing - Formability - Frost effects - Porosity;
D O I：
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学科分类号：
摘要：
Air is always present in concrete mixes. It is intentionally or unintentionally trapped in fresh concrete as a result of mixing and placing. Because air and water do not mix, air trapped in fresh concrete normally is in the form of gas bubbles surrounded by a thin liquid film and suspended in the mix water. Once concrete hardens, the air bubbles are fixed in place. The hollow space formed by the last position and shape of a bubble is an air void. It is shown that small, well-dispersed air voids in concrete can improve workability, reduce bleeding and segregation, and improve resistance to freezing and thawing.
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