Compatibility of viscosity modifiers and water repellent on adhesion of 3D printing materials

Introduction. In the technology of construction 3D printing, with large volumes of concreting, it is necessary to ensure technological breaks and divide the object into sections, while the mortar mixture must have time to acquire the bearing capacity of the material when increasing the height of vertical elements. The peculiarity of conducting work using this construction technology results in problems of forming “cold” joints associated with ensuring the strength of the adhesion of adjacent layers while simultaneously regulating the required rheological and technological parameters of materials for 3D printing. Most studies concern the operation of cement systems in comparison with gypsum systems due to the difficulties in regulating the setting time and water resistance of the stone. Active mineral additives are used to regulate the rheological properties of the mortar mixture. Organic additives can increase the strength of adhesion and adhesion, but require compatibility with other groups of additives. This requires studying the effect of an organic modifying additive and a water repellent on the adhesive strength with a concrete base.

Materials and methods. The preparation of the solution mixture and the aqueous solution of the organic polyfunctional additive was carried out according to the established mode, taking into account the complete dispersion of the modifying component in water during the subsequent production and storage of test specimens in accordance with the methodology regulated by regulatory documents.

Results. The test results indicate a decrease in the adhesion of the material to concrete when adding a viscosity modifier when used together with a water repellent, since the interaction at the interface of the mortar mixture with concrete does not ensure the formation of a physical and chemical bond. Also, when introducing a hydrophobic component into the composition of the mortar mixture, a plasticizing effect is observed with an increase in penetrating ability into the inner layers of concrete, which is indicated by changes in the predominantly cohesive nature of the destruction of specimens to adhesive with the appearance of areas with a type of tearing along the base material.

Conclusions. The relevance of ensuring the compatibility of an organic modifier and a water repellent to ensure the adhesive strength of the material in additive construction production is substantiated and confirmed. The relevance of the topic of further work lies in establishing a rational ratio of a water repellent and an organic additive to ensure high values of adhesive strength and penetrating ability of the mortar mixture.

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