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.