Document Type : Research Article
Authors
1 Faculty Member and Assistant Professor, Department of Civil Engineering, Faculty of Engineering and Engineering, Islamic Azad University, Shabestar Branch, Shabestar, Iran
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Tasuj Branch, Islamic Azad University, Tasuj, Iran
Abstract
Nowadays, improving problematic soils is considered as one of the geotechnical engineering challenges. Since the problematic soils have a secondary origin that are the results of chemical weathering, they have a wide range of dispersive characteristics. One of these types of soils is clay that causes many problems in the engineering project. These problems are related to their specifications, such as week strength, settlement, and dispersivity problems. One of the treatment methods of the mentioned problems is chemical soil stabilization. One of the ways to improve soil quality is to use additives. Due to the widespread use of nanomaterials in different sciences, the impact of these materials as a novel additive can be investigated. In this study, the effect of nanosilica additive on bond strength of clay soils was investigated. In this study, we investigated the effect of nanosilica on unconfined compressive strength of clay soils in Jolfa region using in vitro and uniaxial experiments. Cohesive soil samples were tested by adding different percentages of nanosilica. The results indicate that nanosilica increased the uniaxial compressive strength of the clay soil. The results showed that the percentage of nanosilica additive for optimum compressive strength in clay soil was about 0.8%. Comparison of three series of clay compressive strengths in different percentages of nanosilica additives shows a minimum resistance of about 6 kg / cm2 and maximum resistance of about 9 kg / cm2.
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