Evaluation of the Effect of a Modified Additive on the Physico-Mechanical Properties of Injection Grouts

The aim of this study is to evaluate the effect of a specially modified additive containing a paraffin component on the physico-mechanical properties of injection grouts used for deep soil cementation. Soil reinforcement by injection grouting is a widely applied technique in geotechnical engineering, particularly in conditions where conventional methods are limited due to high groundwater levels or unstable soils. Improving the performance characteristics of grouts can significantly enhance the reliability and durability of soil stabilization. In this research, a series of laboratory experiments was conducted to determine how different concentrations of the additive (ranging from 0.2% to 1.0% by weight) influence key parameters of the grout mixture, including workability, bleeding tendency, and strength development. The experimental results demonstrated that the introduction of the paraffin-based additive leads to increased workability of the grout mixture, which facilitates injection and improves penetration into fine soil pores. At the same time, bleeding was noticeably reduced, contributing to better homogeneity and stability of the hardened material. Mechanical strength measurements indicated a consistent improvement compared to control samples without the additive.