Geotechnical properties of cement-stabilised fill material: Developing a linear regression model for predicting unconfined compression strength and undrained shear stress

The use of cement stabilisation is considered a practical and cost-effective method in the construction sector for enhancing the geotechnical properties of fill materials. This research has the potential to introduce significant innovations in soil stability and strength, which are crucial for the design and construction of various geotechnical structures, such as foundations, embankments, and retaining walls. This study observed changes in unconfined compressive strength (UCS) and undrained shear stress (USS) by varying the percentage of cement content and curing period. Comprehensive geotechnical characterisation was conducted, including specific gravity determination, sieve analysis, maximum and minimum density tests, standard and modified Proctor compaction tests, and unconfined compression testing. Results were analysed and visualised through graphical representations. Cement content (2-7%) and curing time (7-28 days) led to substantial increases in soil UCS and USS, ranging from 18 to 43% for UCS and 13 to 39% for USS. This research employs a linear regression model for predicting these results, which outperforms existing models. This model contributes to the body of geotechnical engineering knowledge and provides direction for further study and real-world applications in soil stabilisation. The research culminates in a compelling demonstration of the transformative impact of controlled increases in cement content and curing time on the geotechnical properties of silty-sand.