Document Type : Research Paper
Authors
1
Master of Science in Geotechnical Engineering, Yazd University, Yazd, Iran
2
Department of Civil Engineering, faculty of Engineering, Yazd University
3
PhD Candidate of Highway and Transportation, Faculty of Civil Engineering, Yazd University, Yazd, I. R. Iran.
Abstract
Marl soils are problematic soils with widespread distribution in Iran and other parts of the world. These soils exhibit good bearing capacity and strength in dry conditions; however, their strength and bearing capacity significantly decrease in the presence of moisture, which emphasizes the necessity of stabilizing marl soil. In the present study, lime, as a traditional stabilizer, and xanthan gum, an eco-friendly biopolymer, were used for stabilizing marl soil. The mechanical behavior of marl soil stabilized with 3%, 4%, and 5% lime by dry soil weight, and xanthan gum at 0.5%, 1%, and 1.5% by dry soil weight, has been discussed and compared. These evaluations were conducted using compaction, unconfined compressive strength (UCS), direct shear, and California Bearing Ratio (CBR) tests. According to the results, increasing the lime content to 4% and xanthan gum to 1% led to a dry density increase of 1.12 and 1.14 times, respectively. The UCS test showed an increase of 4.33 times for lime and 7.66 times for xanthan gum. Additionally, the direct shear test revealed that the cohesion of soil increased by 1.44 times with 5% lime and by 2.52 times with 1.5% xanthan gum. Regarding the internal friction angle, a 1.33-fold increase was observed for 4% lime and approximately 1.5-fold for 1.5% xanthan gum. The CBR value increased by 2.11 times for 4% lime and 2.22 times for 1.5% xanthan gum.
Keywords
Main Subjects
)