Effect of Plasticity Index on Unconfined Compression Strength of the Nano-Soil-Cement

Milad.tajdini¹ Shahab Taheri² Maryam Dorfaki³

1) phd tabriz university
2) Ms.C in Mechanical engineering, KNTU
3) Bs.C. Islamic Azad University Roodehen.

Publication : 2nd International Congress on Civil Engineering, Architecture, Building Materials and Environment(caucong.com/2nd)
Abstract :
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 making a dense and durable composition with low permeability and abrasion resistant. Since most of the recent researches are focused on the addition of nano-SiO2 on concrete, in this paper it has been attempted to use nano-SiO2 particles in soil-cement and observe the effects. Due to the fact that in concrete there are no particles passing sieve 200 and this restriction does not apply to soil-cements, some tests were carried out on the nano-SiO2 + soil-cement matrix because of the meaningful difference between concrete and soil-cement. The test procedure consists of moisture-dry density. In these tests, silica fume (with specific surface area of 21 m2/g), nano-SiO2 (with specific surface area of 200 and 380 m2/g) were added to soil-cement. The results show that adding certain amounts of nano-SiO2 particles to the soil-cement with low plasticity index matrix can improve the unconfined compression strength of soil cement.
Keywords : Key words: Soil-cement Plasticity Index Unconfined Compression Strength Nano-SiO2.