IMPROVING EFFICIENCY IN 3D PRINTING THROUGH MODIFICATION OF FINE-GRAINED CONCRETE COMPOSITION

Additive manufacturing, also known as three-dimensional printing (3D printing), has many advantages over traditional construction technologies, including high construction efficiency, less construction waste, and significantly reduced labor costs. Nowadays, additive technologies are becoming increasingly popular in various fields, including the construction industry. One of the most effective ways to regulate and ensure the required technological and construction properties of concrete mixtures in concrete technology, including 3D printing, is by using various modifying additives. The introduction of active mineral additives into concrete mixes allows for reduced cement consumption, increased cement stone density, improved water resistance, and decreased permeability. This article presents the results of a study on the effect of mineral additives on the properties of cement paste, shape stability, and physicomechanical characteristics of fine-grained concrete in additive manufacturing technology, aiming to select the most effective mineral components for the production of cement materials for 3D printing. The optimization of the structure to form a dense and hermetic high-quality concrete structure based on cement binders can be achieved by introducing finely dispersed mineral additives of various compositions. The study examines the effect of mineral additives on the normal density and setting time of Portland cement, the kinetics of plastic strength gain in cement systems over time depending on the type and concentration of additives and the type of Portland cement, the ultimate shear stress of the concrete mixture, the formability of the mixture, the dimensional stability of the layers, and the physicomechanical characteristics of the hardened composites.