Compressive, shear and durability parameters against freeze-thaw cycles of silty sand improved with nano-silica and basalt fibers

Authors

1 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

Abstract

Today, one of the basic problems in civil and geotechnical projects is related to the soil in the project site, where the soil, as a natural material, does not have enough resistance to withstand the loads. Even if the natural soil available at the project sites in some areas is not suitable for construction, its geotechnical and physical characteristics can be improved by using modern methods. In this article, the effect of basalt fibers and nanosilica as a new material on the compressive strength and shear strength parameters of layered sand samples has been investigated using USC and triaxial tests. The results of UCS tests show that the addition of fibers or nanosilica both increased the compressive strength of the samples, although the effect of nanosilica in increasing the UCS strength over time is greater than the effect of fibers. The combination of basalt fibers and nanosilica can have a more important effect on increasing the UCS strength of the samples. The results of triaxial static tests show an increase in the shear strength parameters of the samples due to the addition of fibers and nanosilica. Also, the application of freeze-thaw cycles has reduced the compressive strength parameters to some extent.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 19 August 2023

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