CONSTRUCTION MIXTURES FOR 3D PRINTING BASED ON MECHANICALLY AND CHEMICALLY ACTIVATED CEMENT-ASH BINDERS

Abstract

The article shows the possibility of obtaining fine-grained mixtures using mechanochemical activated cement-ash binders, which can be used as working mixtures for a 3D printer. It has been proven that the choice of raw materials solves the problem of resource and energy saving under the condition of using man-made waste, in particular fly ash. Currently, cementless or low-cement materials - geopolymers, as well as alkaline activation binders - are promising. Thus, the analysis of the current state of 3D printing technology in construction allows us to state that there are prerequisites for the effective use of industrial waste as mineral additives with the achievement of the optimal mixture composition, which provides the necessary standardized extrusion and mechanical characteristics of such mixtures.  It has been studied that only chemical activation of cement-ash binders does not allow obtaining low-clinker cements, the use of which will provide the opportunity to ensure the minimum required structural strength and strength under compression and bending of a multilayer structure at an early and design age. At the same time, complex mechanochemical activation allows providing sufficient structural strength, strength under compression and bending, as well as adhesion between layers.