3D CONCRETE PRINTING: A STUDY OF PRINTED STRUCTURES DURABILITY

The article presents the results of an experimental study of the influence of technological parameters of construction 3D concrete printing (3DCP) on the durability of printed elements of building structures during accelerated model aging in a climatic chamber. The aim of the work was to study the patterns of degradation of multilayer concrete samples printed on a construction 3D printer in various ways (with and without layer bonding, as well as with cold joint modeling) under cyclic climatic influences. For the experiments, an industrially produced composition of the material for additive construction production 3D4Art was used, applied by a workshop construction 3D printer of a portal design. The control group consisted of monolithic samples of similar geometry. The study included a comparative analysis of the degradation kinetics and mechanisms of destruction of samples during 100 cycles of combined exposure to freezing thawing with humidification. The results demonstrate that while maintaining the overall structural integrity of all samples, 3D printed elements exhibit an increased tendency to crack formation in the areas of interlayer contacts, which is especially pronounced in the case of technological defects (cold seam). The obtained data emphasizes the need for further research into the influence of technologically conditioned defects on changes in the mechanical properties of structural elements during aging. The results of the work are of practical importance for optimizing the technological modes of construction 3D printing to increase the durability of erected structures.