reza kiarostami - Ms.C hydraulic structure engineering Khatam Alanbia
milad tajdini - Ph.D. in Geotechnical engineering Tabriz university
taleb kazemi sheikhzahedi - Ms.C. Transportation engineering IAU South Tehran Branch

Soil cement is a mixture of Portland cement, soil and water, in which hydration of cement and compaction causes the materials’ constituents to bond together and making dense and durable composition with low permeability and abrasion resistant. Since most of the recent researches are focused on the addition of nano-SiO۲ on concrete, in this paper it has been attempted to use nano-SiO۲ particles in soil-cement and observe the effects. Due to the fact that in concrete there are no particles passing sieve ۲۰۰ and this restriction does not apply to soil-cements, some tests were carried out on the nano-SiO۲ + soil-cement matrix because of the meaningful difference between concrete and soil-cement. The test procedure consists of moisture-dry density and unconfined compressive test. In these tests, silica fume (with specific surface area of ۲۱ m۲/g), nano-SiO۲ (with specific surface area of ۲۰۰ and ۳۸۰ m۲/g) were added to soil-cement.

Compaction Test, Nano-SiO۲, Uniaxial Compression Test, Soil-cement.