2.3.3 SEM test
The surface of the foam concrete sample is sawn off and immersed in
anhydrous ethanol for 7 days. Then, dry it in a drying oven to a
constant weight with a temperature of 50℃. It is polished with sandpaper
into a flake specimen (about 1cm × 1cm in size and 2mm thick) and then
cleaned with a brush to determine the observation surface.The instrument
is TESCAN MIRA LMS scanning electron microscope, and the analysis
software is Image j.