Banca de DEFESA: DANIELE SILVERIA BRANDAO E SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANIELE SILVERIA BRANDAO E SILVA
DATA : 14/06/2017
HORA: 14:30
LOCAL: Centro Federal de Educação Tecnológica de Minas Gerais
TÍTULO:

EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO EM GEOPOLÍMERO A BASE DE METACAULINITA

PALAVRAS-CHAVES:

Dispersion. Geopolymer. Nanotechnology. Carbon Nanotubes.

PÁGINAS: 106
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

New technologies that are sustainable and environmentally friendly have been a major industrial challenge. Nowadays the focus of several studies is on the development of materials with improved properties and harmless to the environment. The aim of the construction industry is to replace or reduce the consumption of Portland cement – regarded as a major CO2 contributor – as a mean to achieve great reductions in environmental impacts. Geopolymers are considered environmentally-friendly materials with possible applications in several important areas such as civil engineering. They are inorganic polymers which present environmental advantages in their production, as well as high mechanical and chemical performance. Geopolymers are obtained through the alkaline activation of aluminosilicates with subsequent low or mild curing temperature, resulting in a highly rigid amorphous gel. The objective of this study was to assess the mechanical properties (compressive and flexural strength) and durability-related properties of a geopolymer produced with the addition of carbon nanotubes (CNT). One of the major challenges in working with CNT is its dispersion into the matrix, as they are prone to agglomeration and, therefore, may create defects within the microstructure. An alcohol was used as dispersion media of CNT in the geopolymer, followed by ultrasonic bath and mechanical agitation. Different concentrations of CNT were employed (0.1%, 0.3% and 0.5% wt. of metakaolin), and the properties of the CNT-reinforced geopolymer were compared to the reference geopolymer. The results show that the CNT improve the mechanical properties of the geopolymer, and that its effectiveness is correlated to its concentration in the formulations.

MEMBROS DA BANCA:
Externo à Instituição - JOSÉ MÁRCIO FONSECA CALIXTO - UFMG
Presidente - PAULO HENRIQUE RIBEIRO BORGES
Interno - PETER LUDVIG