EVALUATION OF THE IMPACT OF A MODIFIED ADDITIVE IN INJECTION SOLUTION ON ITS PHYSICAL AND MECHANICAL PROPERTIES

Abstract

The stabilization of weak soils is a critical challenge in geotechnical engineering, particularly in regions with complex geological conditions. This study addresses the problem of limited performance in traditional cement-sand injection grouts used for soil stabilization. A modified additive was developed to enhance the mobility and physical-mechanical properties of such grouts. The proposed additive, composed of paraffin, cement, sulfuric acid, and water, aims to increase the mobility of the injection mixture and improve its penetration into the soil while maintaining or enhancing strength properties. The research evaluates the effects of varying additive concentrations (0.2–1.0% by mass) on compressive strength, flexural strength, and bleeding properties. The experimental results reveal that the additive improves compressive strength by 6–9% and flexural strength by 6–8% at an optimal concentration of 0.6–0.8%, with further increases showing diminishing returns. Bleeding values decreased progressively with additive inclusion, transitioning the grout from conditionally stable (8–16%) to stable (<8%) at 0.6% concentration. Statistical analysis confirmed the consistency and reliability of the results, with variation coefficients below 2%. The study concludes that the additive effectively enhances the performance of injection grouts for soil stabilization, achieving optimal results at 0.6% concentration. These findings provide a cost-effective and efficient solution for improving soil stabilization techniques in geotechnical engineering. Future work will explore long-term durability and environmental impacts of the modified additive.