Banca de DEFESA: MARCELLA DE SENA BARBOSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARCELLA DE SENA BARBOSA
DATE: 22/02/2022
TIME: 15:00
LOCAL: meet.google.com/ziu-pfoa-cpm
TITLE:

DEVELOPMENT OF COMPOSITES FOR 3D PRINTING WITH REDUCED CEMENT CONSUMPTION

KEY WORDS:

3D printing. Cement. Limestone filer. Metakaolin. Buildability. 

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

Recently, 3D concrete printing (3DCP) based on additive manufacturing techniques has been gaining prominence in the construction industry. However, in order to meet the extrusion requirements, 3DCP mixtures are usually dosed with high Portland cement contents. Therefore, a solution seen as promising to make this technology more sustainable is the reduction of cement consumption through partial replacement by mineral additions. In view of this, the present research aims to develop composites for 3D printing containing different percentages of limestone filer and metakaolin as binder fraction of the analysis compositions. The proposed mixtures encompass substitution contents of 30% (using only limestone filer) and 40% (one with 40% limestone filer and another containing 30% limestone filer with 10% metakaolin). In the fresh state, these mixtures were evaluated through the tests of spread, slump, bulk density, incorporated air content, squeeze-flow and buildability. In the hardened state, analyses of flexural strength, compression, adherence between layers, specific mass, void index and water absorption by immersion were performed. In general, the mixtures demonstrated compliance with the requirements of the printer handled. A highlight is given to the composite containing 30% of filer with 10% of metakaolin that, with the ideal amount of mixing water, showed excellent fluidity, good print quality, and ideal viscosity level after extrusion for good shape retention of the printed element. The behavior in the hardened state indicated that it was related to cement consumption. The higher this parameter, the better the mechanical performance of the mixtures. The results show the possibility of obtaining printable composites with reduced cement consumption, establishing itself as a relevant alternative for 3DCP printing by meeting the criteria required for the printing system used.

BANKING MEMBERS:
Presidente - 022.621.844-96 - MARCOS ALYSSANDRO SOARES DOS ANJOS - IFRN
Interna - 2621720 - ANA CECILIA VIEIRA DA NOBREGA
Interno - 671.403.354-00 - KLEBER CAVALCANTI CABRAL - UFERSA
Externo à Instituição - ULISSES TARGINO BEZERRA - IFPB