Banca de QUALIFICAÇÃO: CLEANTO CARLOS DE QUEIROZ JUNIOR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CLEANTO CARLOS DE QUEIROZ JUNIOR
DATE: 21/02/2022
TIME: 08:00
LOCAL: Remota
TITLE:

Study of the influence of from ornamental stone cutting residue on the properties of 3D mortars

KEY WORDS:

Mortar, 3D printing, RPPO, mechanical properties, residue.

PAGES: 77
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Materiais Conjugados Não-Metálicos
SUMMARY:

In recent decades, the construction industry has advanced considerably, and this is mainly due to the search for greater productivity, mitigation of the negative environmental impact caused by the extraction of raw materials from nature and cost reduction, aiming at market competitiveness. Therefore, the creation of new constructive methods has been quite widespread, as is the case of construction from 3D printing, which allows the execution of concrete, mortar, masonry, among others, with speed, conformation flexibility - because this method does not use forms - and in an automated way, since the methodology does not need workers to execute the object to be printed. In addition, the replacement of natural raw materials by waste, whether from the construction industry itself or not, in addition to reducing the negative environmental impact generated by the removal of natural raw material, this waste is also used in a noble way. it would be discarded, in most cases, costly to the generating source. Thus, this work aimed to evaluate the influence of partial replacement of fine aggregate used by waste from ornamental stone cutting (RPPO) on the physical and mechanical properties of 3D mortar. The replacement of fine aggregate by RPPO was carried out in proportions of 5, 10 and 15% in relation to the cement mass. Furthermore, a reference mortar was produced, for comparison of properties, that is, without RPPO. In the fresh state, consistency index, infinite block and squeeze flow tests were analyzed. In the hardened state, it was verified, through the testimonies extracted from the molded blocks, both physical (water absorption, mass density and void index) and mechanical (compressive strength and flexural tensile strength) properties of the produced traces. Furthermore, the physical and chemical characterization of the RPPO was carried out by means of particle size, X-ray diffraction (XRD) and X-ray fluorescence (FRX) tests. Compressive strength and flexural traction were verified by testing in the load directions perpendicular and parallel to the fibers, among which, the direction parallel to the fibers presented better results in the flexural tensile test. The compressive strength results ranged from 18.57 to 27.80 MPa, the latter referring to the mix with the addition of 10% of the RPPO, revealing that the addition of the residue improved this property. In the compressive strength test, there were no considerable differences in relation to the load direction of the test. The flexural tensile results reached values in the range of 5.12 to 7.85 MPa, the latter referring to the mix with the addition of 15% of the RPPO, once again showing that the addition of the residue increased the mechanical strength of the mortar.

BANKING MEMBERS:
Presidente - 1298936 - ANTONIO EDUARDO MARTINELLI
Externo à Instituição - EDILBERTO VITORINO DE BORJA - IFRN
Externo à Instituição - KLEBER CAVALCANTI CABRAL - UFERSA