Impact of hydration and gelling properties of guar gum on the mechanism of soil modification
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2ND CAJG 2019
Impact of hydration and gelling properties of guar gum on the mechanism of soil modification Evangelin Ramani Sujatha 1 & Saisree Sivaraman 1 & Anandha Kumar Subramani 1 Received: 20 February 2020 / Accepted: 14 November 2020 # Saudi Society for Geosciences 2020
Abstract Soil improvement and treatment is a necessity off-late in response to the growing demand for construction spaces. Also, for the emphasis of development in the right direction, it is necessary to select a sustainable and economic technique to treat the soil. Biopolymers present such an eco-friendly alternative material for soil treatment. This study investigates the viability of using guar gum, a polysaccharide for improving the geotechnical properties of clay soil. Guar gum is solvable, non-ionic and hydro-colloidal in nature. The viscosity of guar solutions increases significantly with the gum content but the change in pH with viscosity is very marginal. Its nature to form bio-film and gel plug leads to a substantial decrease in the permeability of the treated matrix. Its tendency to form viscous gels, hydrate and form hydrogen bonds helps in improving the stiffness of the soil matrix and thereby enhances its strength. The treated soil behaves like clay in stiff consistency, failing at higher loads and lower strains with higher stiffness modulus. The formation of hydrogen bonds is a function of time, and hence, the strength of the treated soil–guar mixtures also increases with age. Though biopolymers are susceptible to decay and degradation, the rate of degradation is retarded and strength gain is observed throughout the period of investigation (i.e. 90 days). Keywords Biopolymer . Guar gum . Viscosity . Hydrogen bonds . Gel plug . Bio-film
Introduction Soil stabilization is a mandatory pre-construction activity offlate. Many different traditional techniques are used in line with the site conditions, economy and time constraints. But the environmental impact of methods using admixtures like cement, lime, fly ash and a host of other chemicals is a cause for concern due to the alarmingly high energy consumption related to issues like carbon sequestration, hazardous waste disposal, infrastructure rehabilitation, global warming, brownfield clean-up and water resource protection (Dejong et al. 2011). Studies report that soil stabilization using traditional Responsible Editor: Zeynal Abiddin Erguler This paper was selected from the 2nd Conference of the Arabian Journal of Geosciences (CAJG), Tunisia 2019 * Evangelin Ramani Sujatha [email protected]; [email protected] 1
Centre for Advanced Research on Environment, School of Civil Engineering, SASTRA Deemed to be University, Thanjavur 613401, India
binders like cement accounts for 10% of the world’s carbon emissions (Dejong et al. 2011) and the construction industry accounts for nearly 40% of the global energy consumption which underlines the necessity of exploring alternative techniques like biological methods that will provide a sustainable solution (Dejong et al. 2011; Cha
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