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Open AccessReview

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

1
Department of Civil Engineering, Central South University, Changsha 410075, China
2
Department of Civil Engineering, Ahmadu Bello University, Zaria 810107, Nigeria
*
Author to whom correspondence should be addressed.
Materials 2020, 13(8), 1820; https://doi.org/10.3390/ma13081820
Received: 5 March 2020 / Revised: 8 April 2020 / Accepted: 9 April 2020 / Published: 12 April 2020
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%. View Full-Text
Keywords: bubble stability in concrete; film strength; gas diffusion rate; surface tension; nano-silica bubble stability in concrete; film strength; gas diffusion rate; surface tension; nano-silica
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MDPI and ACS Style

Zeng, X.; Lan, X.; Zhu, H.; Liu, H.; Umar, H.A.; Xie, Y.; Long, G.; Ma, C. A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors. Materials 2020, 13, 1820.

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