Effect of Filler and Aggregates Dosage and Particle Size Range on the 3D-Printable Mixture Extrudability

The article presents the results of studies of the rheological behaviour and plasticity of 3D-printable mixtures. The results of the influence of the type, dosage, and particle size range fillers, and aggregates on the rheological behaviour of mixtures, the stability of their structure, and plasticity under compression are discussed. Two types of 3D-printable mixtures were investigated “cement – filler – plasticizer – water”, “cement – aggregate – plasticizer – water”. A compression test with a constant strain rate of 5 mm/s was used in the experiments. It was found that the best extrusion ability is possessed by mixtures capable of viscoplastic flow without destruction of the structure. For these systems, overcoming the stability threshold and the onset of plastic flow without cracking corresponds to a pressure of 2.5–4 kPa, rational values of plastic yield value are 1.5–3.5 kPa. When fillers and aggregates with mono-particle size are applied, 3D-printable mixtures have low structural stability to the action of loading, they are characterized by irreversible destruction of the structure after overcoming the stability threshold. Fillers and aggregates with multi-particle size range in their particle size range d=1–630 mm can effectively regulate the plasticity and stability of the structure of 3D-printable mixtures. Higher ductility and aggregate stability under load are achieved when fillers with an amorphous structure are used. 3D-printable mixtures are capable of viscous-plastic flow without destruction of the structure and sufficient structural strength at a dosage of fillers (d=1–55 mm) up to 30% of the cement mass, aggregates (d=150–560 mm) in an amount of 100–125% by weight of cement.

G.S. SLAVCHEVA, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
E.A. BRITVINA, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
M.A. SHVEDOVA, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
P.Y. YUROV, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Voronezh State Technical University (84, 20-letiya Oktyabrya Street, 394006, Voronezh, Russian Federation)

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