Performance of alkali-activated binder-treated jute geotextile as reinforcement for subgrade stabilization

Abstract

Geotextiles are widely used for reinforcing soil, improving drainage, controlling soil erosion and embankment construction. Existing research recommends the improvement of soil in an economic and eco-friendly manner using jute geotextiles. However, jute fibres have the tendency to degrade in the acidic and alkaline environment of the soil. Jute geotextile treated with antimicrobial chemicals are used as a substitute for manmade geosynthetics, as it improves the life expectancy of jute. But these chemicals are expensive and are a potential source of leaching. The present study aims to develop a fly ash-based treatment procedure that is economic, ecologically safe as well as significantly improves the engineering and strength properties of jute as a geotextile. There is an increasing interest in the application of alkali-activated binders (AAB) in engineering practices. It is produced by the reaction between an aluminosilicate precursor (primarily Class F fly ash and/or slag) and alkali activator solution. AAB-treated jute geotextile shows that the load-bearing capacity increases by 27% approximately. The vertical permeability of sand does not vary significantly with the inclusion of AAB-treated jute. The tensile strength of jute also exhibits a marked improvement following the treatment. Thus, the technique proposed in this study has the potential for implementation in practical applications.