For expansion joints, the domestic practice is that they can be opened continuously, and the maximum plate length should not be greater than 6m, generally 5m, 1. Construction joints shall be left at expansion joints (upper and lower joints), and the contraction joints shall be 7- 10 mm wide and approximately 1/4- 1/5 thick, and shall be filled. The filler is usually asphalt, which can be diluted with gasoline according to the label or not.