Abstract
India is an agricultural country producing plenty of rice husks which is mostly used as fuel in the boilers for processing paddy, producing energy through direct combustion or by gasification. In India, about 122 million tonnes of paddy is produced annually and about 20–22% rice husk is generated from paddy and 20–25% of the total husk becomes as rice husk ash. After burning, each ton of paddy produces about 40 kg of rice husk ash. The rice husk creates great environment threat causing severe damage to the land and the atmosphere. Therefore, in this study, rice husk ash was used to stabilize the laterite soil which covers large area in India and elsewhere. Laterite soil was collected from Kodakani, Shimoga district, and was stabilized with varying percentages of rice husk ash, geopolymer, and rice husk-based geopolymer. A series of unconfined compressive strength tests was carried out on the above-specified sample conditions with varied dosages of the stabilizer and curing period. Based on the test results, it was found that the strength of the soil is increased by 2, 3, and 5 times, respectively, with geopolymer, RHA and RHA-based geopolymer as stabilizer with a curing period of 7 days. RHA-based geopolymer can be effectively used as a stabilizer for subgrade stabilization and this technique leads to an eco-friendly sustainable pavement.
Published Version
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