About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Mukhametrakhimov R. Kh., candidate of technical sciences, associate professor, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Ziganshina L.V., postgraduate student, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. E-mail: lilya0503199@gmail. |
| Title of the article | Technology and quality control of 3DCP |
| Abstract. | Relevance of the problem being solved is caused by the imperfection of 3DCP products, which is expressed in the formation of defects and deviations, one of the reasons for which is the lack of a quality control system for 3DCP. The purpose of the research is to develop the composition of operations and control tools for the additive manufacturing (3DCP). The influence of the features of CAD-model preparation, rheological and technological characteristics of the mixture (mobility and yield strength) on the quality of construction products printed on a 3D printer has been studied. It is necessary to take into account the features in the formation of the G-code of a CAD-model to obtain products on a 3D printer with the required length: elongation of the sample by an amount caused by the spreading of the raw mixture, as well as elongation of the sample by the distance from the center of gravity of the extruded raw mixture to its face in the initial and end positions of the nozzle. Nonmobile mixtures are characterized mainly by the formation of defects as a violation of geometry, straightness, gaps between layers and along the length of the layer, thickness differences, and the absence of spread. More mobile mixtures are characterized by a greater degree of formation of defects as geometry violations, straightness, thickness variation, flow, however, there are no defects as gaps between layers and along the length of the layer. The dependence of the geometric deviations of the length of printed sample, which is a multilayer strip, on the limiting shear stress of the mixture, under constant 3D printing modes, is expressed by a linear function ?l=?0,5276 ? ?0+168,31. Based on the identified features of 3DCP, the main provisions for the organization and implementation of quality control of 3DCP are proposed, which establish the composition of operations and means of control during the work performance. Significance of the obtained results for the construction industry consists in reducing the defects in 3DCP products by improving the quality control system in additive manufacturing, taking into account the influence of the features of CAD-modeling, rheological and technological characteristics of the mixture, as well as the composition of operations and control tools during incoming, operational and acceptance control. |
| Keywords. | concrete, rheology, 3D printing, 3DCP, additive technologies, construction technology and management, quality control. |
| For citations: | Mukhametrakhimov R. Kh., Ziganshina L.V. Technology and quality control of 3DCP//News KSUAE 2022 № 1(59). С 64-79. DOI: 10.52409/20731523_2022_1_64 |
