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Mechanical Characterization of a Bio-enzyme Treated Granular Lateritic Soil for Application in Low Volume Roads

2022; Springer Nature; Linguagem: Inglês

10.1007/978-981-16-6456-4_21

2366-2557

Vishal Khanna, Brundaban Beriha, Umesh Chandra Sahoo,

Clay minerals and soil interactions

Traditionally cement, lime and fly ash or combinations of these materials have been used for stabilization of soils and granular materials. Studies on bio-enzyme stabilization suggest that it has the potential to replace these chemicals with more economical as well as environmental friendly solution for potential application in pavement structural layers of low volume roads. Use of bio-enzyme is one such sustainable method which facilitates cation exchange which in turn leads to reduction in adsorbed water on the clay particles. In this, clay (the substrate) is hydrolyzed into calcium silicate hydrate (reaction product), in the presence of bio-enzyme. The formation of reaction product depends upon the concentration of clay particles, dosage of bio-enzyme and environmental factors. In the present study, a commercial bio-enzyme, known as TerraZyme (extracted from sugar molasses) was used with and without addition of cement, to study its effect on strength and durability characteristics of a granular lateritic soil collected from eastern part of India. Effect of curing period, curing temperature and bio-enzyme dosage on the strength and durability properties of the soil was investigated. Mechanical properties of the stabilized soil were evaluated in terms of unconfined compressive strength (UCS) and flexural strength (FS). Results indicate that bio-enzyme is effective in stabilization of granular lateritic soils for application in structural layers of low volume road pavements. However, the strength of the bio-enzyme stabilized specimens under soaked condition needs to be evaluated to recommend it for areas subjected to poor drainage conditions.