Banca de QUALIFICAÇÃO: LEONARDO DE SOUZA DIAS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LEONARDO DE SOUZA DIAS
DATE: 13/01/2022
TIME: 15:00
LOCAL: meet.google.com/eey-hsnc-jdo
TITLE:

Evaluation for design parameters of cementitious mixtures for 3DCP printing with constant humidity

KEY WORDS:

3DCP, printability, squeezze-flow tests, constitutive ratios of mix, hardened state.

PAGES: 30
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

3D concrete printing (3DCP) has gained prominence in several recent researches, however there are still gaps in the parameters required for the design of printable cementitious mixtures. 3DCP printability depends on intrinsic properties of cementitious mixtures, such as materials particle size, cement types and mineral additions, water/binder volumetric ratios (Vw/Vb), paste/aggregate volume (Vp/Vs), paste volume (Vp), water volume (Vw) and sand/total solids ratio (S/solids) correlated with the printing system (printer type, pumping, extrusion, printing speed, etc). 3DCP buildability depends on intrinsic properties of the cementitious mixtures, such as materials granulometry, cement types and mineral additions, water/binder volume ratio (Vw/Vb), paste/aggregate volume (Vp/Vs), paste volume (Vp), water volume (Vw) and sand/total solids ratio (S/solids) correlated with the printing system (printer type, pumping, extrusion, printing speed, etc). This paper analyzes six mixtures for 3DCP printing with variations in the cement:sand ratios (by mass), keeping the mixture's humidity constant, in relation to the mass of the dry materials (Vw/Md), evaluating the printing capacity of these mixtures in a low-cost gantry-type 3D printer with mechanized movement in its axes, having an extruder nozzle for material deposition. The hardened state properties, flexural and compressive strength, specific gravity, and voids content of the printed mixtures were also determined. The results showed that for the printing system used there is an ideal range for these constitutive relations, and that the mixtures, even if they have different viscosity flow, measured according to squeeze flow, can have printability, as long as they meet the ideal ranges for the constitutive relations.

BANKING MEMBERS:
Presidente - 022.621.844-96 - MARCOS ALYSSANDRO SOARES DOS ANJOS - IFRN
Interna - 2621720 - ANA CECILIA VIEIRA DA NOBREGA
Externo à Instituição - ULISSES TARGINO BEZERRA - IFPB