Banca de QUALIFICAÇÃO: EDUARDO QUINTELLA FLORENCIO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : EDUARDO QUINTELLA FLORENCIO
DATE: 21/03/2023
TIME: 13:00
LOCAL: Sala de Treinamento no LCCV
TITLE:

Use of lightweight foamed concrete by Additive Manufacturing (3DCP): a study of the synergy between equipment and material.

KEY WORDS:

Additive manufacturing. Concrete formulation. Cellular concrete, 3DCP.

PAGES: 59
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Materiais Conjugados Não-Metálicos
SUMMARY:

This research aims to explore the selective deposition of lightweight concrete with entrained air, called cellular concrete (CC), aiming application by additive manufacturing (AM) of parts for civil construction. It will be used adapted devices, grouped as a system, that allows studying the synergy relations between the equipment and the material in laboratory scale. The research mainly covers the aspects related to the production and delivery of the material in its storage, transportation, air entraining, additivation and extrusion stages. The additive manufacturing of CC, although promising, is still a little explored theme. The equipments currently available for the production of CC generally meet the large scale production. When they are specific for MA, they have high cost. Besides the properties established by the conditioning factors that help to understand the dynamics of the MA using concrete, the maintenance of the bubbles stability, responsible for the target density of the CC shows itself as a critical aspect.  The fluid and pumpable material needs to be deposited by extrusion, maintaining its shape, supporting the sequence of top layers that will be superimposed and allowing the materialization of the desired shape. For the cellular concrete, the instability of the bubbles could create an unwanted gradient with increasing filament density during the printing time.  It is assumed that the CC can be a good choice for application by MA if the synergy between formulation and application method is established. Moreover, the CC may present itself as an eco-efficient alternative due to its thermo-acoustic characteristics and light weight. The research was divided into three stages: in a first stage, the system containing equipment for foam generation, pumping and concrete extrusion was developed. Still in this stage, formulations of CC found in literature, specific for MA, were used and improved to evaluate the performance of the newly developed equipment. In the second stage, the equipments will be improved according to the response perceived in the experiments. Adjustments in the formulation, analysis and documentation of the experimental processes will also be conducted. In the third stage, the produced pieces will be evaluated regarding dimensional precision, mechanical resistance and thermal performance, through specific tests. As preliminary results of the step 1, guidelines about the performance of the equipment and formulations of suitable CC for 3D printing were obtained. It is expected as a result of the research the creation of a reliable system for additive manufacturing of CC. The choice of a compact and low-cost format aims to meet small and medium scales, compatible for use in civil construction as well as in laboratory for future improvements of formulations in research on the subject.

BANKING MEMBERS:
Externo(a) à Instituição - WILSON RICARDO LEAL DA SILVA
Interno(a) - 2544065 - MARCIO ANDRE ARAUJO CAVALCANTE
Interno(a) - 2120767 - PAULO CESAR CORREIA GOMES
Externo(a) à Instituição - RAFAEL GIULIANO PILEGGI - USP
Externo(a) à Instituição - ROBERTO CESAR DE OLIVEIRA ROMANO - USP