*3.3. Binders (Activators)*

The influence of common hydraulic binders on soil stabilization (cement and hydrated lime) was investigated in this paper. Specifically, Portland cement PC 20M (S-L) 42.5R "Beoˇcin Profi" with the mixed addition of granular slag and limestone from the manufacturer "Lafarge"(Beoˇcin, Serbia) was used. Important technical specifications for used cement are given in Table 4. On the other hand, in the case of lime, hydrated lime from the "NEXE" (Jelen Do, Serbia) manufacturer was employed. Besides binders, liquid additive PolybondTM from "Superroads Technologies" (Lausanne, Switzerland) was also used. PolybondTM is based on sulfuric acid and surfactant, which improves soil strength and soil resistance to moisture infiltration and frost. The PolybondTM stabilization effect is based on its ability to perform ionic water substitution on the soil particles' surface using stabilizing molecules. The main feature of the stabilizing molecules attached to the soil particles' surface is to repel moisture, thereby reducing the ability of clay particles to attract water [49]. Addition of PolybondTM increases the ultimate compression strength of specimens after 28 days by 1.5–2 times compared to reference specimens [49].


**Table 4.** Technical properties for cement PC 20M (S-L) 42.5R.
