The Influence of Nano Bentonite on Geotechnical Characteristics of Sand

Engineering characteristics of different soil mixture are influenced by each of components. In this research the influence of nano bentonite on engineering behavior of nano bentonite- sand mixture (NBS) are investigated.
An experimental study involving, compaction test, direct shear and permeability tests was carried out to investigate mechanical behavior and hydraulic conductivity of NBS. different nano bentonite- sand mixtures were prepared. The maximum dry unit weights and corresponding optimum water contents were obtained. According to the results of direct shear test, the highest cohesion (c) and highest internal friction angle (φ) was selected and the permeability tests were performed in 4 states of compaction, include 90, 100, 110 and 120 % maximum dry unit weight.
The results show that permeability decreases by increasing nano bentonite and compaction degree. The lowest permeability is related to sample with 9% nano-bentonite. The cohesion increases by increasing nano bentonite content till 5%, but after that the internal friction angle is increases. The effect of nano-particles is more than compaction on permeability.