IJEP 42(13): 1555-1563 : Vol. 42 Issue. 13 (Conference 2022)
Dharmendra Singh*, Vijay Kumar and R.P. Tiwari
Motilal Nehru National Institute of Technology Allahabad, Department of Civil Engineering, Prayagraj- 211 004, Uttar Pradesh, India
Abstract
Expansive soils are known worldwide for their volume change behaviour due to variations in the water content. Expansive soils contain clayey minerals such as montmorillonite, which increase in volume during wetting and decrease in volume during drying. As a result, it is one of the most problematic kinds of soil, causing significant annual income losses by destroying roads, pipelines and buildings worldwide every year. This study examines the effect of varying Terrafirma content and the effect of varying Terrafirma content on the strength of black cotton soil. The strength of clayey soil can be altered by the addition of Terrafirma. In this article, attempts are made to describe the effect of Terrafirma on the impact strength of expansive soils, when mixed with such soils. Stabilizer like Terrafirma has a wide range of response spectrum. A wide range of laboratory tests, such as the Atterberg limit test, free swell index (FSI) test, compaction test, unconfined compressive strength (UCS) test, California bearing ratio (CBR) test and expansion ratio measures are performed on expansive soil sample with an increasing percentage of Terrafirma between 2-8%. Test results indicate that the inclusion of Terrafirma mixture, not only reduces the plasticity of soil but also increases its unconfined compression strength, maximum dry density and other strength characteristics. The test results indicated a decrease in MDD, specific gravity and UCS as the percentage of Terrafirma in a mix increased. Further, with the increase in the curing period from 0, 4, 7, 14, 28, 56 and 90 days, there was an improvement in UCS value. Further, with the increase in the curing period from 7, 14 and 28 days with 4 days soaking, there was an improvement in CBR value. The swelling was determined in CBR soaking tank by the expansion ratio of the treated soil after 7, 14 and 28 days of curing. Moreover, increasing CBR amount under the influence of increasing Terrafirma is one of the main results of this paper. This study includes the chemical analysis of expansive soils using x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) before and after the stabilization using Terrafirma in order to evaluate the geotechnical properties.
Keywords
Black cotton soil, Terrafirma, California bearing ratio, Field emission scanning electron microscopy, X-ray diffraction
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