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Geomechanics and Engineering Volume 34, Number 3, August10 2023 , pages 221-231 DOI: https://doi.org/10.12989/gae.2023.34.3.221 |
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A study on the efficacy of low viscous nanosized biopolymer on the mechanical and hydraulic properties of organic silt |
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Govindarajan Kannan and Evangelin Ramani Sujatha
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| Abstract | ||
| Biopolymer stabilization is a sustainable alternative to traditional techniques that cause a lesser negative impact on the environment during production and application. The study aims to minimize the biopolymer dosages by sizing the bio-additives to the nanoscale. This study combines the advantages of bio and nanomaterials in geotechnical engineering applications and attempts to investigate the behaviour of a low viscous biopolymer, nano sodium carboxymethyl cellulose (nCMC), to treat organic soil. Soil is treated with 0.25%, 0.50%, 0.75% and 1.00% of nano-bio additive, and its effect on the plastic behaviour, compaction characteristics, strength, hydraulic conductivity (HC) and compressible nature are investigated. The strength increased by 1.68 times after 90 days of curing at a dosage of 0.5% nCMC through the formation of gel threads connecting the soil particles that stiffened the matrix. The viscosity of 1% nCMC increased exponentially, deterring fluid flow through the voids and reduced the HC by 0.85 times after curing for 90 days. Also, beyond the optimum dosage of 0.50%, the nCMC forms a film around the soil particles that inhibits the inter-particle cohesion causing a reduction in strength. Experimental results show that nCMC can effectively substitute conventional additives to stabilize the soil. | ||
| Key Words | ||
| cellulose; CMC; nano; UCS; viscosity | ||
| Address | ||
| Govindarajan Kannan and Evangelin Ramani Sujatha: Centre for Advanced Research in Environment, School of Civil Engineering, SASTRA Deemed to be University, Thanjavur – 613401, Tamil Nadu, India | ||