Efficiency of stabilizing additives in strengthening clay soils with mineral binders

Objective. Most of the territory of the Russian Federation experiences a shortage of stone mineral materials used for the construction of road base layers. As an alternative, in areas with a shortage of stone materials, it is advisable to use soils reinforced with binders. At the same time, it has been established that the use of mineral binders in their pure form has a number of disadvantages, the main one of which is the low crack resistance of reinforced soils, which is explained by their low deformability. The purpose of the work is to conduct research on the effect of two stabilizing additives «Underbold» and «Geo-R-Bond» on the physical and mechanical properties of loam when it is reinforced with cement.

Method. To conduct a comprehensive analysis of the physical and mechanical properties of reinforced soil using stabilizing additives, cylindrical samples were developed and tested in accordance with the requirements of GOST 70452-2022 «Soils stabilized and strengthened with inorganic binders. General specifications».

Result. A comprehensive study of the strength characteristics of soil concrete samples depending on the dosage of cement and stabilizing additives allowed us to develop optimized formulations that ensure maximum operational reliability of the material. During the experimental studies, it was found that an increase in the cement content in the soil concrete composition leads to a proportional increase in its strength indicators. Analysis of the data obtained showed that maximum strength is achieved with the introduction of 7% cement into loamy soil, which indicates that an optimal balance has been achieved between plasticity and structural integrity of the material.

Conclusion. The use of the considered stabilizers in soil strengthening contributes to an increase in the tensile strength of samples when splitting, which indicates an improvement in crack resistance. In the process of a comprehensive assessment of the effectiveness of soil stabilizers, taking into account the physical and mechanical characteristics of the reinforced material and the optimal ratio of components, the most effective composition was identified. In this context, it should be noted that the optimal proportion of stabilizing agents includes 7% cement in combination with the «Underbold» additive.

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