Properties of Bubble used in Concrete ac cording to Change in Manufacturing Condition

This study is a research investigation into the properties of bubbles that affect the characteristics of foamedconcrete during its production. The study examined the properties of bubbles based on the manufacturing conditions. Toinvestigate these properties, the selected experimental factors included bead size, the length/diameter ratio of the bubble-generating tube, and compressed air. The experimental design used a design of experiments, and the test results wereanalyzed using analysis of variance. The foaming agent used to generate bubbles was AES (Alcohol Ethoxy Sulfate), andthe method employed for bubble manufacture was the pre-foaming method. In the test results, a significant factor affectingthe foaming rate of bubbles was the bead size; the highest foaming rate was observed when using 2mm beads. Bead sizealso primarily influenced the volume change of the aqueous solution, while other factors did not affect the foaming rateand volume change. None of the factors affected the change in bubble size, but compressed air was considered the mainfactor affecting bubble size and its change. The foaming rate and volume change of the aqueous solution showed a highcorrelation with each other. Spherical bubbles in the early stage eventually transformed into angular bubbles. Moreover,over time, it was observed that the bubble size increased.