%0 Journal Article %T Experimental investigation of lime impact on self-healing and dispersion processes of clay soils (Case study: Gurdyan dam) %J Amirkabir Journal of Civil Engineering %I Amirkabir University of Technology %Z 2588-297X %A Roushangar, Kiyoumars %A Alami, Mohammad Taghi %A Houshyar, Yagoub %D 2020 %\ 08/22/2020 %V 52 %N 6 %P 1347-1360 %! Experimental investigation of lime impact on self-healing and dispersion processes of clay soils (Case study: Gurdyan dam) %K Clay soil, Dispersive %K Double hydrometer %K Lime %K Pinhole Test %K Self-healing %R 10.22060/ceej.2019.15354.5893 %X Dispersive soils have been responsible for excessive erosion in some soil practices or structures such as dams or channels. Dispersion and high penetration of clay soils are the important factors, which can reduce the efficiency of clay soils and lead to the failure of dams and embankments. Soil stabilization is an effective technique for controlling erosion. Clay soil self-healing characteristic as one of the positive characteristics of this type of soil has been investigated in recent years. In this research, the impact of lime on self- healing capacity of clay soils was investigated. In this regard, soil samples excavated from Gordyan dam (Iran) were considered. Two samples (S2 and S3) of dispersive soils (ND3 and ND4) with 0.25, 0.5, 1, and 2 % lime were prepared. Pinhole, double hydrometer and atterberg limits tests were performed and self-healing and dispersion processes of samples were investigated. The results showed that with adding 1% of lime to clay soils, the range of soil plasticity increased and the outflow of the pinhole test and the final diameter of both samples decreased up to 28% and 67%, respectively. This issue indicated an improvement in clay soil self-healing capacity and a reduction in soil dispersivity. The results also showed that the pinhole test led to more accurate and reliable results than other tests in investigating the clay soil dispersivity. %U https://ceej.aut.ac.ir/article_3267_e8c3028bcba6652e20316286c97a7e9e.pdf