Research on the forming mechanisms of the apparent air bubbles for concrete used by aluminum formworks
SUN Chao
HU Yubo
SHEN Zhangpeng
SONG Xuefeng
LUO Zuoqiu
ZHANG Lin
ZHANG Kaifeng
Abstract：The study compared the influence of template material on the formation of apparent bubbles in cast-in-place concrete,confirming that concrete poured with aluminum formworks is prone to surface bubble formation.Building on this,single-factor experiments were conducted to analyze the influence of defoaming agent type,admixture type,and environmental temperature on the formation of apparent bubbles in concrete poured with aluminum formworks.The results show that when using a defoaming water-based release agent,the total area ratio of apparent bubbles in concrete poured with aluminum formworks is only 0.011％,which is superior in appearance to using an oil-based release agent.Environmental temperature affects the surface quality of concrete,with high temperatures being conducive to reducing bubble formation.In an average temperature environment of 33 ℃,the total area ratio of bubbles in concrete poured with aluminum formworks is only 0.034％.The dual addition of 10％slag powder and 10％fly ash can effectively improve the fluidity of concrete,thereby reducing the number of surface bubbles when pouring concrete with aluminum formworks,with the total area ratio of bubbles being only 0.013％.
Keywords：aluminum formworksapparent bubblesformation mechanism
Publication Date：2024-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 56-59 )