Subgrade stabilization using fly ash This topic is related to pavement design and analysis . Since all layers of pavement are constructed over the Subgrade , then stabilization of the subgrade is extremely important. Specifically , this assignment addresses FLY ASH as one of the subgrade stabilization materials. Structure of this assignment has to be as following : 1- Introduction ( write in general about fly ash and how it is used as subgrade stabilization material ) 2- Advantages ( of fly ash as subgrade stabilization material ) 3- Disadvantages (of fly ash as subgrade stabilization material ) 4- Case study ( about using of fly ash as subgrade stabilization material ) 5- 8 Reputable references are needed no more. The expert has to create (Word document file ) for the whole report according to the Points above. Note : PPT file is required as well include fife (5) slides, each slide consist of 5 bullet points no more. These slides are needed for the presentation of this topic , that's why the slides have to cover the whole topic briefly and clearly.