Enhancing strength parameters of Firoozkooh sandy soil improved with Persian herbal gum

Document Type : Research Article

Authors

1 School of civil engineering, Iran university science and technology, Tehran, Iran

2 Department of civil engineering, Iran university of science and technology

Abstract

Various improvement methods have been proposed to improve the mechanical and physical characteristics of soil for construction and other similar matters. One of the improvement methods is using environmentally-friendly elements such as Persian herbal gum as a renewable hydrocolloid biopolymer. Regarding this, in the present laboratory study, the effect of adding this gum to the Firoozkooh sand (No 161) was investigated. Persian gum-water mixture was added in different percentages relative to the weight of dry soil, and the created samples were subjected to unconfined compressive strength test to identify the optimal conditions of the composition. In spite of the variability of the weight percentages of water and gum added to the soil, the effect of the weight of the soil, curing temperature (room or oven temperature), and curing time (7 to 56 days) were investigated. To interpret the effect of Persian gum addition, several scanning electron microscope tests were performed on selected dry samples. The results clearly revealed an increase in the unconfined compressive strength of the samples improved with Persian gum up to 4 MPa due to the presence of many carboxyl and hydroxyl groups in the gum. Samples cured at room temperature with relative humidity of 15% displayed lower unconfined compressive strength than similar samples cured at oven temperature due to the hydrophilic properties of herbal gum and increased flexibility of the created bonds.

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 6
September 2023
Pages 1123-1136

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