Research Progress on Formation and Regulation of Air Void Defects on Fair-faced Concrete Surface
JIANG Qian1,2,*, YU Cheng1, ZHANG Qian1, ZHOU Maixi1, LIU Jianzhong1, HAN Fangyu1
1 State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China 2 Jiangsu Research Institute of Building Science Co., Ltd., Nanjing 210008, China
Abstract: Fair-faced concrete is widely used in civil engineering construction for its aesthetic qualities (including the absence of bugholes, uniform colour appearance and natural surface texture) and for reducing carbon emissions.The control of surface air voids is one of the most difficult problems in the preparation of fair-faced concrete due to the unclear mechanism of void formation and the enormous coupling factors.Recently, researchers have attempted to qualitatively analyse the relationship between some key factors (such as concrete materials and construction processes) and surface air void characteristics, in order to guide the fair-faced concrete construction practice.In this review, the authors summarized the research progress on surface air void defect formation and regulation studies.From the point of view of the conversion of air bubbles into surface air voids during concrete hardening, the formation, Ostwald ripening, migration and adhesion of air bubbles in fresh concrete are the key processes.Thus, four aspects were introduced, including the evaluation of surface air void defects, air bubble evolution, the influence of concrete rheological state under vibration on air bubble emission, and the function of formwork/release agent.The main conclusions and remaining problems of the existing literature were also highlighted.Finally, the authors prospected the research and application of the formation mechanism and regulation methods of concrete surface air void defects.
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