The aim of this work is to evaluate the special effects of Powder material on the compaction effort of clay samples with various mineralogical composition; predominantly smectite clays, predominantly kaolinitic clays and clays with mixed mineralogical composition (Illite/ Kaolinite/ Smectite). Selected soils were subjected to intensive testing in the laboratory to investigate the engineering behavior of Compaction Energy on the unconfined compressive strength of the powder material improved clay soils with different mineralogical composition. The laboratory tests include mineralogical examination of the clay soil samples, atterberge limit tests (liquid and plastic limits), particle size distribution, specific gravity (gs) and compaction test, compaction energy test as well as unconfined compression test (UCS). Three samples of clay soil by different mineralogical composition were mixed with their optimums powder material, 6.5%, 7%, and 4% for all samples 1, 2 and 3 respectively and compacted with optimum water content and maximum dry density. The compaction effort tests have shown that in practice good compaction is detrimental for good performance of the Powder material improved clay soils. Remarkable drop in both density and unconfined compressive strength was noticed when compaction effort was less than the Standard Proctor effort. Papers findings presented that the relative advantage of powder material to increase the unconfined compression (UCS) of the studied samples is highly dependent on Kaolinite mineral and highly compaction effort (modified compaction) for the powder material improved clays.

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