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Laboratory Study of the Cyclic Behavior of Cement Sand with Nanoclay

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Abstract

Shear modulus and damping are of the most important dynamic characteristics of soil in seismic geotechnical engineering. Improving the dynamic properties of soils by adding cement content, and then replacing a part of cement, which its production is one of the most important sources of carbon dioxide emissions in the world, with natural materials such as nanoclay is of particular importance. In the present study, the cyclic behavior of silty sand was compared with the cyclic behavior of cemented sand containing cement and nanoclay additives. The soil used in this research was Firuzkooh mountain sand and silt, classified as ML type based on the unified classification system. All the samples were made by wet complaction method and cyclic triaxial tests were performed with three different confining pressures of 50, 100 and 150 kPa in the medium shear strain range. The results showed that the values of the shear modulus of cemented sand samples with a water to cement ratio of 1 are greater than the values of the shear modulus of the silty sand samples in all ranges of shear strains. The values of shear modulus increased by substituting nanoclay instead of cement in the cemented samples, and vice versa, the damping of the samples decreased with the addition of cement. By substituting part of the cement with nanoclay, the damping decreased with a lower rate. On the other hand, with the increase of confining pressure, the shear modulus values of all the considered soils increased and their damping decreased.

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Data Availability

The datasets generated during the current study are available in the Mohammad Mollaei repository, Mollaei.s@gmail.com.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by MM. The first draft of the manuscript was written by HJ and MA. All authors read and approved the final manuscript.

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Correspondence to Homayoun Jahanian.

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Mollaei, M., Jahanian, H. & Azadi, M. Laboratory Study of the Cyclic Behavior of Cement Sand with Nanoclay. Geotech Geol Eng 41, 3375–3387 (2023). https://doi.org/10.1007/s10706-023-02463-z

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  • DOI: https://doi.org/10.1007/s10706-023-02463-z

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