| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Domestic and Foreign Research Progress of Air-entraining Agents for Low-slump of Plastic Concrete and No-slump of Dry-hard Concrete Used in Highway Concrete |
| BAI Yafei1,2,WANG Dongmin1,2,3
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1 School of Chemical ＆ Environmental Engineering, China University of Ming ＆ Technology, Beijing, Beijing 100083, China;
2 Institute of Concrete and Environmental Materials, China University of Ming ＆ Technology, Beijing, Beijing 100083, China;
3 Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta,Binzhou University, Binzhou 256603, China |
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Abstract Air entraining agent, as an admixture capable of introducing a large number of evenly distributed, closed and stable microbubbles in the mixing process of concrete mixture, has been highly concerned by researchers and peers at home and abroad since its discovery. Because on the one hand, it can effectively improve the workability, water retention and cohesiveness of concrete mixture, and improve the fluidity of concrete; on the other hand, it can greatly improve the frost resistance, salt resistance, impermeability, sulfate corrosion and alkali-resistant aggregate reaction performance of concrete, effectively reduce the thermal diffusion and conductivity of concrete, and can improve the volume stability of concrete, enhance the weather resistance of field structures, thereby prolonging the service life of highway concrete and improving durability of highway concrete. The air entraining agent is mainly used for structures with high frost resistance requirements, such as concrete dams, pavements, bridge decks, airport road surfaces and other large areas that are susceptible to freezing, and has a very broad research and application prospect.
However, today’s air entraining agents, for highway concrete, especially low-slump of plastic concrete and non-slump of dry-hard concrete, have always had difficulty in ventilating, poor foaming of introduced bubbles, poor foam stability, and air bubbles. The problems of large diameter and uneven distribution of bubbles lead to serious problems such as poor workability, frost resistance and durability of highway concrete. In recent years, the focus of research has been based on how to effectively solve the problem of air entrainment dynamometer, poor foaming of introduced bubbles, poor bubble stability, large bubble diameter, and uneven bubble distribution.
At present, research has been carried out on raw materials such as rosin resins, alkyl and alkyl arene sulfonic acids, fatty alcohol sulfonates, sapiens, etc., and in recent years, researchers at home and abroad have based on the above raw materials, from the perspective of structural design, through the effective modification of molecules and the introduction of a certain amount of special functional groups, which have made some exploration and progress on the problems of air entraining agents in highway concrete.
This paper discusses the definitions and types of air-entraining agents about low-slump of plastic concrete and no-slump of dry-hard concrete used in highway concrete and its evaluation methods from a new perspective, focusing on the domestic and foreign research progress of air-entraining agents about low-slump of plastic concrete and non-slump of dry-hard concrete used in highway concrete. And the latest research progress of air-entraining agents in highway concrete is analyzed from the new perspectives of molecular type, synthesis, design, model and so on, and a comprehensive review of the research status of low-slump of plastic concrete and non-slump of dry-hard concrete for highway concrete in terms of workability, frost resistance and durability, and two “ideal” air entraining agent molecular structure models are proposed based on our research results. It is helpful to understand the effect of air entraining agent for highway concrete on low-slump plastic and no-slump of dry-hard concrete, and better designs directly and develops a new air entraining agent used in low-slump of plastic concrete and no-slump of dry-hard concrete in highway concrete.
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Published: 10 April 2020
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| Fund:This work was financially supported by the National Key Basic Research Special Foundation of China (2017YFC0505904), National Natural Science Foundation of China (51572293) and Shanxi Major Special R & D Plan (MC2016-02). |
About author:: Yafei Bai, he is currently pursuing his master’s degree in the Institute of Concrete and Environmental Mate-rials, China University of Ming ＆ Technology, Beijing,under the supervision of Prof. Dongmin Wang. His research has focused on concrete and cement admixtures, etc.
Dongmin Wang, he is a professor and doctoral tutor in the School of Chemical and Environmental Engineering of China University of Mining and Technology, Beijing and director of the Institute of Concrete and Environmental Materials of China University of Mining and Technology, Beijing. He is also the executive director of the Chinese Ceramic Society and the chairman of the Solid Waste Subcommittee of the Chinese Ceramic So-ciety. He has long been committed to the research and development of fine chemical synthesis and application of cement and concrete materials in the modern high performance and their chemical admixtures, as well as the preparation and application of industrial/mining solid waste treatment and building materials of ecological environment. In the mo-dern cement and concrete materials and admixtures, solid waste treatment (including fly ash, desulfurization gypsum, metallurgical slag, chemical waste, construction waste, etc.) and ecological materials, a lot of research and technology development work has been done, and remarkable results have been achieved. It has completed more than 50 scientific research projects, including national, ministry, fund committee and Beijing Municipality, and hundreds of industrial projects. The research results have won more than 10 ministries, industry associations and Beijing Science and Technology Progress Awards, 9 national invention patents, more than 100 scientific papers, and 6 academic monographs. |
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2020, Vol. 34 
