Abstract 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.

中文翻译：

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混凝土引气剂在不同介质中的特性分析

摘要 比较了饱和氢氧化钙溶液、水泥浆、砂浆、新拌混凝土和硬化混凝土（经过不同振动处理）等6种混凝土引气剂（AEA）在不同介质中的作用效果。结果表明，在饱和氢氧化钙溶液的表面张力拐点处，AEA 浓度越低，在混凝土中获得相同空气含量所需的 AEA 就越少。同样，具有更好加气性能的 AEA 会导致更高的初始水泥浆泡沫高度和更低的砂浆密度。新拌混凝土和硬化混凝土的含气量差异较大；高频振动可以显着优化低坍落度混凝土的气泡空间。