Features of the technology for molding concrete based on waste using 3D printing

Abstract

This article provides an overview of world practice in the field of additive technologies and features of waste-based concrete molding technology using 3D printing in the construction industry. The initial stage of the formation and development of additive manufacturing processes in construction 3D printing technology of construction by multilayer extrusion is one of the technologies of concrete molding and regulatory documentation and literature sources are analyzed to determine the place of the technology under study in additive manufacturing processes. Based on the literature review and analysis, the need to ensure optimal rheotechnological properties in the construction 3D printing technology in order to achieve maximum efficiency is determined. The article formulates the main technical requirements for the concrete mix in terms of performance and installation time, as well as the features of the choice of concrete composition. It is possible in principle to obtain fine-grained concretes with specified characteristics based on Portland cement. The results of a study using the methodology of mathematical planning and analytical optimization of the results are presented, the purpose of which is to create scientific prerequisites for the promotion of 3D concrete-based construction and the results of a study of the rheological and physico-mechanical properties of modified concrete with the addition of special alkali-resistant fiberglass for three-dimensional construction printing. In this case, the rheological and technological characteristics of the structure of a cement-sand mortar mixture are shown for its shape stability, plastic strength, adhesion, and defect. In this regard, the first stage analyzes the regulatory documentation, as well as the processes and methods of construction 3D printing, the state of the additive manufacturing market. At the second stage, the composition of raw materials mixtures used in construction 3D printing technology is studied.