FINE-GRAINED CEMENT-ASH CONCRETE FOR 3D PRINTER
DOI:
https://doi.org/10.31713/budres.v0i42.006Abstract
The article an analysis of the main types of basic building mixtures for 3D printing and the requirements for their basic properties is presented. Shows the possibility of obtaining cement-ash fine-grained concrete mixtures and concretes, which can be used as working mixtures for a 3D printer. Using the mathematical planning of experiments, a complex of polynomial models of the properties of cement-ash fine-grained concrete mixtures for 3D printing was obtained, including their time of suitability for extrusion "open time", the structural strength required for layering the mixture after a certain time after mixing, tensile strength during splitting characterizing the adhesion of layers and the compressive strength of extruded concrete. As a mineral admixtures, concrete included fly ash, and the hardening accelerator – building gypsum.
The influence of fly-ash and the addition of a hardening accelerator on the complex of properties of the proposed fine-grained concrete for 3D concreting has been established.
A laboratory printer was designed and used for research. On the basis of the obtained models, the analysis of the factors of the composition of cement-ash concrete mixtures for the investigated properties is carried out.
Taking into account the peculiarities of manufacturing building structures during the construction of structures using a 3D printer, the necessary properties of extruded mixtures and concretes based on them are determined. Methods for determining the normalized properties of a concrete mixture, the design of a laboratory printer and a device for determining the required structural strength during its layer-by-layer laying are proposed.
