混凝土中气泡的产生与发展:机理和影响因素

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Abstract An improvement in the working performance of fresh concrete and the durability of hardened concrete can be achieved by air-filled voids introduced by stirring process and air-entraining agents, which will not significantly decline the strength of hardened concrete. In the process of concrete mixing, transportation, pouring, vibration and curing, bubbles in fresh concrete are constantly changing until concrete hardens and some bubbles become a part of the pore structure. The behavior of bubbles in fresh concrete resembles the one in aqueous solution. However, the multiphase (including gas, liquid and solid) and cement hydration process are distinctions between concrete and aqueous solution. This urges intensive research endeavors to figure out the properties of air-void shells in fresh cement paste and how cement hydration process influences bubble generation and evolution. And in recent years, impressive strides have been made in understanding the influence of environmental factors, concrete composition and construction process on bubble stability in fresh concrete. This review offers a retrospection of the research efforts with respect to the mechanism of generation, growth, stability, and instability of bubbles, and provides elaborate descriptions about the influence of temperature, atmospheric pressure, concrete composition and construction technology on bubbles. We then pay attention to the problems confronting the experimental method and theoretical model and discuss further research on concrete bubbles.

Key words： bubble air void bubble generation stability air-entraining agent temperature

Published: 09 December 2021

CLC number:

TU528

Fund:This work was financially supported by the National Key R & D Program of China (2017YFB0309903).

About author:: Xiang Luo graduated from the Department of Civil Engineering of Tsinghua University in July 2019 with a bachelor's degree in engineering. Now he is a postgra-duate student of China Building Materials Academy. He conducts research under the supervision of Professor Wang Ling. At present, his main research field is concrete durability.
Ling Wang has been engaged in the research and technical development of concrete admixtures and concrete durability since 1993. She completed more than 10 national natural science foundation of science and technology research, and 973 basic research projects, which included concrete alkali aggregate reaction, shrinkage cracks of high strength and high performance concrete, concrete additive, raw materials of concrete volume change and the influence of crack formation mechanism and control technology, key technology of high performance of road cement concrete pavement, roadbed-bridge transition section concrete materials, the durability of reinforced concrete under multi-factor synergism. In these projects, she concluded a lot of research results.

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Cite this article:

LUO Xiang,WANG Ling,WANG Zhendi. Mechanism and Influencing Factors of Bubble Generation and Evolution in Concrete[J]. Materials Reports, 2021, 35(z2): 213-217.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/Iz2/213

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