Banca de DEFESA: PAULA MARICELE DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PAULA MARICELE DA SILVA
DATE: 07/12/2022
TIME: 09:00
LOCAL: meet.google.com/eja-wkrc-pze
TITLE:

SYNTHESIS OF GEOPOLLYMERS PRODUCED FROM AMPHIBOLITE FOR APPLICATION IN CIVIL CONSTRUCTION

KEY WORDS:

geopolymers; mechanical properties; mining residue; experimental design (DOE).

PAGES: 78
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Geopolymers are inorganic macromolecules produced by alkaline activation of aluminosilicate materials. Its use in civil construction is a promising alternative to replace Portland cement (PC), whose manufacture is responsible for 7% of CO2 emissions on the planet. In addition, the production of geopolymers is environmentally sustainable, as its raw material is industrial waste that can be used and recovered, rather than being discarded. For the development of the geopolymer, a precursor is needed, such as an aluminosilicate mineral, and an alkaline activator, such as NaOH or sodium silicate. This work aimed to analyze the mechanical properties of a geopolymer produced from niobium mining waste, especially the amphibolite rock, used as a precursor. According to the Extreme Vertices mixture experimental design methodology, specimens were prepared with different molar ratios of SiO2/Al2O3, Na2O/SiO2 and H2O/Na2O, under curing conditions at room temperature. The samples were submitted to axial compressive strength and tensile strength tests. The results obtained in the response surface contour region ranged from 0.04 to 0.26 MPa for tensile bond strength and from 0.7 to 1.96 MPa for compressive strength. The interpretation of the generated response model indicated optimal values of proportions of NaOH, SiO2 and water for the experiment performed. The values were close to those established by technical standards for mortars and cements (ABNT, 2005). Therefore, it is argued that viability of amphibolite as a geopolymer and raw material in civil construction.

BANKING MEMBERS:
Presidente - 1985765 - FABIANO LUIZ NAVES
Interna - 000.000.000-00 - GISELLA ROSSANA LAMAS SAMANAMUD - SS364
Interna - 1491686 - RENATA CAROLINA ZANETTI LOFRANO
Externa ao Programa - 1870897 - MARIANA ARRUDA PEREIRA
Externo à Instituição - MATEUS DE SOUZA AMARAL - UFOP