Innovative method for strengthening and reconstructing foundations of buildings and structures with nanocomposite

Introduction. An urgent problem today is determining the rational composition of an injection solution to improve the quality of soil stabilization and strengthening of foundations of buildings and structures subject to renovation, without impact, vibration, and mechanical effects. The aim of the study is to substantiate the possibility of using a composite solution modified with an ANT additive to increase the stability of foundations. Methods and materials. To strengthen soils to increase the stability of building foundations, injection is carried out with composite solutions based on various materials. In composite injection solutions, in addition to the main component – cement – various additives capable of accelerating structure formation and reducing its consumption in the recipe are used. Such additives include aluminosilicate nanotubes. Results. The value of the optimal concentration of the nano-aluminum-containing additive, which maximizes the strength of the composite system, was revealed. An approximating plane was constructed, representing a two-factor regression model of experimental data, depending on time and concentration, representing a polynomial with a degree of 5 in x and a degree of 3 in t. The data were implemented in the MathWorks MATLAB program. Discussion. It was found that the maximum structuring rate of the composite system occurs at an additive content of 0.125% ANT. The appearance of this effect can be explained by the formation of a new phase of cement stone with increased adhesion. Conclusion. The introduction of the optimal concentration of aluminosilicate nanotube additive into the composite solution allows it to be used as a composite solution to increase the stability of foundations.