Banca de QUALIFICAÇÃO: RÍSIA AMARAL ARAÚJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : RÍSIA AMARAL ARAÚJO
DATE: 31/05/2021
TIME: 09:15
LOCAL: Remota
TITLE:

Evaluation of 3d printed concrete mixes with superior thermal performance.

KEY WORDS:

3D printed concrete, light expanded clay aggregate, mix design, por squeeze flow rheometry, thermal comfort.

PAGES: 112
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Materiais Conjugados Não-Metálicos
SUMMARY:

The development of 3D printed concrete mixes has been significantly studied during the last few years. However, the optimization of the thermal comfort of printed structures still requires further improvement. Therefore, the objective of the present study is to evaluate the effect of replacing natural sand by light expanded clay aggregate (LECA) on the properties of Portland-based 3DCP mixes. The mixtures were defined by a 2² factorial design with independent factors as the substitution content (% sub) of sand by LECA and the aggregate relation to binders ratio (a/b). The substitution of natural sand by LECA was carried out in volume% due to the difference in density, in order to maintain the granulometric distribution of the mixes. The compression flow technique together with the well-known consistency table were used to evaluate the rheological behavior of 3DCP mixes containing aggregates with up to 1.2 mm in maximum diameter. The experimental results show that the substitution of sand by LECA increased the yield stress of the mixes and improved their constructability, maintaining the same workability, compressive strength and porosity as the reference LECA-free mixture. The thermal insulation behavior of the mixes was improved by the use of LECA in the composition.  The thermal behavior of the mixes was modeled and an equation dependent only on the % sub factor) was found.

BANKING MEMBERS:
Presidente - 1298936 - ANTONIO EDUARDO MARTINELLI
Externo à Instituição - KLEBER CAVALCANTI CABRAL - UFERSA
Externo à Instituição - MARCOS ALYSSANDRO SOARES DOS ANJOS - IFRN