Ground improvement by the Sand Compaction Pile (SCP) method has been applied for soft clay layer at many construction sites in Asian countries. This method needs high-quality sand, and it, however, has been exhausted. Meanwhile, steel-making generates masses of iron-and-steel slag as a by-product. This situation results in a simple solution that slag will be used as ground improvement material instead of exhaustible sand. Slag has the characteristics of solidification and brittleness after curing. It is important to consider the changing behaviour when reusing slag for ground improvement. Therefore, the present study examined the deformation behaviour of improved ground using slag as an improvement material. The ground under a caisson was subjected to an inclined load simulating backfill soil. The main feature of this study is to use a geotechnical centrifuge technique to satisfy the similarity rule. The model tests resulted that slag was a viable alternative to natural sand as an improvement material.
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