Characterization of expansive soils treated with lignosulfonate
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Characterization of expansive soils treated with lignosulfonate Rama Vara Prasad Chavali* and B. Reshmarani *Correspondence: [email protected] Department of Civil Engineering, Velagapudi Ramakrishna Siddhartha Engineering College, Vijayawada 520007, India
Abstract The current study examines the potential of lignosulfonate to enhance the engineering behavior of two locally available expansive soils. The expansive soils were collected from Vijayawada and Amaravathi, located in the Capital Region of Andhra Pradesh, India. The soils were treated with four different percentages (0.5, 1, 2, and 4) of lignosulfonate and were allowed to interact for 7 and 28 days. A series of laboratory tests such as unconfined compressive strength, cation exchange capacity and scanning electron microscopy were carried out on the soil specimens. The results indicated that lignosulfonate has significant influence on the strength behavior of expansive soils. The amount of fines content present in soils defines the optimum percentage of lignosulfonate. Lignosulfonate treatment resulted in reduced negative surface charge of soils and formation of Polymer chain microstructure along with flocculated or aggregated particle microstructure, which may attribute to the enhanced strength of the expansive soils. Keywords: Expansive soil, Lignosulfonate, Unconfined compressive strength (UCS), Cation exchange capacity (CEC), Scanning electron microscopy (SEM)
Introduction Nowadays, urbanization and industrialization are the two most important processes worldwide. These processes are associated with huge consumption of natural resources as well as enormous production of industrial by-products. In view of the environmental problems posed by these materials, there is an urgency to recycle and/or reuse the by-products in huge amounts. On the other hand, subgrade properties are considered to be essential pavement performance parameters. The black cotton soil deposits, cover extensive areas in India, are associated with inferior subgrade characteristics such as low strength and resistance to deformation under load. Soil stabilization is considered as an effective solution for sustainable improved performance of subgrades. The two most commonly used traditional chemical stabilization methods are lime and cement stabilization. In light of environmental and economic concerns, there is a need to upgrade traditional stabilization techniques with available waste materials. Thus, the present study focused on effective utilization of lignosulfonate, an industrial by-product, to meet the ever increasing demand for the subgrade stabilization materials.
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