Soil cement subbase design sections in AutoCAD 2D drawing, CAD file. In road construction, soil cement is widely used as a sub base layer to protect and reinforce the subgrade as well as for pipe bedding and slope protection. Although it has strong tensile and compressive strength, it is brittle and has low tensile strength, making it susceptible to cracking. For more detailed information download the 2D AutoCAD dwg file.