The purpose of this paper is to identify the specifications of volcanic tuff (scoria) widespread in the south of Syria, many laboratory tests have been done for determining the basic physical properties of scoria the addition of compaction, shear res
istance, particle size distribution, and California bearing ratio. Also, an analytic study has been done to state the possibility of using scoria in filling by itself or after being mixed with clay (forming the greatest part of soils in south Syria), examining the change occurring in clay. So we have determined clay specifications, adding scoria to clay using different percentages:
(5% - 10% - 15% - 20% - 25% -30%)
Then we study the specifications of each mixture, such as compaction properties, shear resistance, particle-size distribution, and California bearing ratio.
