THE INFLUENCE OF A MODIFIED ADDITIVE BASED ON A PARAFFIN COMPONENT ON THE WORKABILITY AND SETTING TIME OF AN INJECTION GROUT FOR THE DEEP SOIL CEMENTATION METHOD

Abstract

The construction industry has seen an increasing reliance on advanced techniques to ensure the stability and durability of structures, particularly in challenging soil conditions. A notable method employed is deep grouting of soils, which necessitates enhanced formulations of injection mortars to augment their mobility and regulate setting time. This study proposes a modified additive comprising paraffin, sulfuric acid, and cement to enhance the rheological and physical-mechanical characteristics of injection mortar. The experimental framework encompassed cone spreading tests and determination of setting time in accordance with GOST standards. The findings indicate that the optimal water-cement ratio (WCR) for mortar mobility of 150 mm is 0.5. The results demonstrate that the additive linearly augments the mobility of the mortar, attaining a maximum value of 187 mm at an additive concentration of 1.0%. However, the optimum concentration in terms of mobility is the range of 0.6-0.8%. The effect of the additive on the setting time exhibited a nonlinear pattern; the greatest increase in setting time was observed at the 0.2% additive concentration (88 minutes increase), while at the 1.0% concentration, the increase was only 12 minutes. Therefore, the optimum additive concentration to balance mobility and setting time is 0.6-0.8%. The outcomes of this study substantiate that the modified additive has the potential to enhance the characteristics of the injection mortar, thereby providing more efficacious solutions for soil consolidation in a range of construction settings.