On the Basis of lots of experiments and studies about using natural sandy gravel and mixture, application of natural sandy gravel to expressway pavement subbase is analysed with examples in project.

By the determination of unconfined compressive strength,the possibility of crushed mudstone stabilized by steel slag powder used as road subbase material in high grade highways is researched.

Reusing test study and application of phosphogypsum-lime solidified soil in road base course

The sulfur amount of fly ash has a substantial influence on the intensity and stability of road base course.

This paper expounds the superiorities of cement stabilized aggregate being as the material of the base course, and points out some matters need attention in the process of construction preparation, mixing, paving, rolling, and curing, etc.

According to the lab test and the construction,the success has been made to apply the tailing sands to the base course of pavement as a building material,thus reducing the environmental pollution,saving land resource.

The author made the research on the techniques of applying coal gangue as base course materials against the situation that there is a lot of abandoned coal gangue in the coal area.