Several certain minimum requirements must be satisfied in order to improve the physical and engineering properties of soils adequately. If soil and its potential uses are considered such factors as unconfined compressive strength, durability, grain size and liquid limit should be considered. For this reason the above mentioned factors were used as criteria-indices of soil improvement by cement. A combination of relationships developed between slaking, unconfined compressive strength and liquid limit of artificial clayey soils stabilized by cement proved the influence of their composition on the engineering properties. Also experiments were carried out on unconfined compressive strength of two different cement stabilized clayey admixtures contained natural and active bentonite to study the strong change of strength. Finally a comparison was made in engineering properties between natural soils (organic soil, cohesive clay with LL > 60%) and the artificial clayey soils to prove the strong influence of composition and deleterious contents on the proper hy-dration of soil-cement mixtures.
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