新拌混凝土中气泡稳定性综述：机理与主要因素
A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors.
作者信息
Zeng Xiaohui, Lan Xuli, Zhu Huasheng, Liu Haichuan, Umar Hussaini Abdullahi, Xie Youjun, Long Guangcheng, Ma Cong
机构信息
Department of Civil Engineering, Central South University, Changsha 410075, China.
Department of Civil Engineering, Ahmadu Bello University, Zaria 810107, Nigeria.
出版信息
Materials (Basel). 2020 Apr 12;13(8):1820. doi: 10.3390/ma13081820.
In order to improve the stability of air bubbles in fresh concrete, it is of great significance to have a better understanding of the mechanisms and main influencing factors of bubble stability. In the present review, the formation and collapse process of air bubbles in fresh concrete are essentially detailed; and the advances of major influencing factors of bubble stability are summarized. The results show that the surface tension of air-liquid interface exerts a huge impact on bubble stability by reducing surface free energy and Plateau drainage, as well as increasing the Gibbs surface elasticity. However, surface tension may not be the only determinant of bubble stability. Both the strength of bubble film and the diffusion rate of air through the membrane may also dominate bubble stability. The application of nano-silica is a current trend and plays a key role in ameliorating bubble stability. The foam stability could be increased by 6 times when the mass fraction of nano-particle reached 1.5%.
为提高新拌混凝土中气泡的稳定性，深入了解气泡稳定性的机理及主要影响因素具有重要意义。在本综述中，详细阐述了新拌混凝土中气泡的形成与破灭过程；总结了气泡稳定性主要影响因素的研究进展。结果表明，气液界面的表面张力通过降低表面自由能和普朗特排水，以及增加吉布斯表面弹性，对气泡稳定性产生巨大影响。然而，表面张力可能不是气泡稳定性的唯一决定因素。气泡膜的强度和空气透过膜的扩散速率也可能主导气泡稳定性。纳米二氧化硅的应用是当前的一个趋势，并且在改善气泡稳定性方面起着关键作用。当纳米颗粒的质量分数达到1.5%时，泡沫稳定性可提高6倍。
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