Concrete Chemicalization for Digital Printing: Control of Rheology and Structure Formation

Abstract

The stages of evolution of rheological properties and structure formation of concrete in digital printing conditions with layer-by-layer application of material and in the absence of formwork are considered. A solution to the problems of each stage of the evolution of rheology is proposed by concrete chemicalization, which is a fine-grained composite based on two active substances: a mineral binder and a polymer binder. The chemical additives present in concrete are represented by a complex of phloroglucinfurfural oligomers and polymer molecules of polyvinyl alcohol. It was found that the phloroglucinfurfural super plasticizer not only reduces the maximum dynamic shear stress, but also increases the area of the hysteresis loop, which characterizes the structure of the system and the speed of its recovery after destruction. It is proved that polymer molecules lead to an increase in the elastic-plastic strength of the layer. The interaction between the system components of both the dispersed phase (polyvinyl acetate, cement, sand) and the dispersion medium (phloroglucinfurfural oligomers, polyvinyl alcohol molecules) does not lead to undesirable side effects; on the contrary, there is a positive synergy effect when additives act on the rheology and structure formation of concrete.