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| 摘要: |
| 研究了高频振捣对不同品种引气混凝土气泡参数的影响.结果表明:高频振捣后,混凝土含气量大幅度降低;适当的高频振捣有利于改善引气混凝土气泡结构,但过度的高频振捣不利于改善掺稳定性较差的引气剂的混凝土气泡结构.掺不同引气剂的混凝土经高频振捣后其气泡结构有较大差异,优质引气剂经高频振捣后可在混凝土中形成大量微小气泡,气泡间距系数显著降低. |
| 关键词: 引气,高频振捣,含气量,气泡间距系数,气泡平均直径 |
| DOI： |
| 分类号:TU528.1 |
| 基金项目:致谢：本文试验得到了北京工业大学交通研究中心张金喜教授、北京高强混凝土公司杨荣俊高级工程师的大力支持,北京工业大学研究生杜辉参加了部分试验工作,在此一并表示感谢. |
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| Effects of High-Frequency Vibration on Air Void Parameters of Air-Entrained Concrete |
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YANG Qian-rong ZHU Bei-rong YANG Quan-bing WANG Bo SHU Jing
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| Abstract: |
| Effects of high-frequency vibration on air void parameters of air-entrained concrete with four different types of air entraining agents(AEA) were studied.The findings indicate that air content in concrete decreases greatly after high-frequency vibration.Appropriate high-frequency vibration could improve air void structure of hardened concrete,whereas excessive high-frequency vibration for concrete with poor quality AEAs would not favor improvement of air void parameters.Concretes with different AEAs yield quite different air void structures after high-frequency vibration.Air void spacing factor decreases remarkably due to high-frequency vibration and a lot of tiny air voids is entrained in hardened concrete with good quality AEAs. |
| Key words: air entraining,high-frequency vibration,air content,air void spacing factor,mean air void diameter |
