Geotechnical Engineering Towards sustainability, stabilization of soft clay soil using some waste material
Volume Title: ICASGE2025
Paper ID : 1151-ICASGE-FULL
Authors
Department of Civil Engineering, Faculty of Engineering, Pharos University in Alexandria, Egypt
Abstract
Soft clay soils are known for their low strength, high compressibility, and susceptibility to bulky settlement, making them challenging for construction projects. Traditional soil stabilization methods often involve costly chemical additives or expensive materials, prompting the search for more sustainable alternatives. In response to increasing environmental waste recycling, this study explores the use of rice straw—an agricultural byproduct that is typically discarded or incinerated—as a natural recycled material to improve the engineering properties of fine clay. The research investigates the effects of incorporating various rice straw contents (0, 2%, 2.5%, and 3%) with straw lengths (1.5 cm and 2.5 cm) on the consolidation behaviour, unconfined compressive strength (UCS), and California Bearing Ratio (CBR) of soft clay at three moisture contents (Wc) of 55%, 60%, and 65%. By utilizing rice straw, this approach not only enhances soil stability but also provides a sustainable solution for both soil improvement and agricultural waste management. Consolidation and UCS tests demonstrated significant improvements in soil strength and compressibility with rice straw addition. Additionally, CBR tests simulated soil replacement by mixing rice straw with soft clay at specified proportions and compacting at varying depths in a mold to replicate field conditions. Results indicate that rice straw enhances the load-bearing capacity and reduces compressibility of soft clay, offering a cost-effective, eco-friendly alternative for soil stabilization. This study highlights the potential for integrating recycled agricultural materials like rice straw into geotechnical engineering, contributing to environmental sustainability and improved infrastructure performance.
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