College of Environment and Environmental Education and Sustainable Development Environmental Science and Bioengineering 2476-4582 8 1 2019 06 01 Stabilizing clay soils incorporating nano materials (through a sustainable development approach) 65 82 103622 10.22034/uoe.2019.103622 EN Abolfazl Soltani Associate Professor in Geotechnical Engineering, School of Civil Eng., Shahid Rajaee Teacher Training University (SRTTU), Tehran- Iran. Amin Moradi Master in Geotechnical Engineering SRTTU, 1678815811, Tehran, Iran. Nabi-allah Ahmadi PhD. Student in Geotechnical Engineering, SRTTU, 1678815811, Tehran, Iran. Journal Article 2018 03 07 In this paper, the performance of some nano materials including multi wall carbon nano tubes (MWCNTs), carbon nano fibers (CNFs), nano silica, nano kaolinite and nano montmorillonite is compared in order to evaluate geotechnical properties and elastic modulus of the stabilized clayey soils. The mechanical tests were carried out on samples treated by nano particles indicate that MWCNTs and CNFs are essential additives for improving the physical properties of unstable soils including Atterberg limits, optimum moisture content and maximum dry density. Small amounts of nano silica and nano kaolinite particles increased the maximum dry density, the unconfined compressive strength (UCS) and the elastic modulus (<em>E</em>) results. However, a reverse trending in optimum moisture content is observed in    which nano silica treated the soil towards the higher water contents. In contrast, nano kaolinite performs a higher positive influence on the stiffness of the treated specimens using a significant amount of less water absorption. It is concluded that the major difference between the performances of all the studied nano particles includes that nano montmorillonite reduced the dry density of soil as the ω% increased. This type of soil stabilizing is in agreement with sustainable development strategies. https://www.jesb.ir/article_103622_79a74df42756d020ad63bae5f0c89beb.pdf