Banca de QUALIFICAÇÃO: JERONIMO COURA SOBRINHO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JERONIMO COURA SOBRINHO
DATA : 09/08/2018
HORA: 10:00
LOCAL: PPGEC
TÍTULO:

CEMENTITIOUS COMPOSITES REINFORCED BY FABRIC AND MICROFIBERS OF VEGETABLE ORIGIN

PALAVRAS-CHAVES:

Asbestos-free cementitious composites; jute fabric and cellulosic microfiber as reinforcement of fiber cement; protection of the cellulosic fibers by the autoclaving process.

PÁGINAS: 60
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Construção Civil
ESPECIALIDADE: Materiais e Componentes de Construção
RESUMO:

The ban on the use of asbestos as a reinforcement of cementitious composites in some countries and the scarcity of asbestos have stimulated research on the use of alternative fibres to replace that mineral. Cementitious composites reinforced with alternative fibres especially natural ones are considered eco-friendly and are presented as a low cost alternative due to the availability of natural fibres. On the other hand, the production of natural fibre reinforced cementitious composites requires special care to ensure the quality of the interface between the matrix and the reinforcement and to minimize the effects of alkaline attacks as well. The most tested natural fibres are sisal, jute, curauá, cotton, flax, hemp, ramie, bamboo and plants such as eucalyptus and pine. The researches have evaluated the mechanical performance and the durability of the composites with alternative fibres, in the search of compositions that guarantee the compatible characteristics to the applications of the cementitious composite. The chemical composition of natural fibres of vegetable origin (cellulose, hemicellulose and lignin), besides being responsible for the adhesion with the cement matrix, is also susceptible to alkaline attacks, causing the degradation of the reinforcement and consequent decrease of the durability of the composite. These two factors are the major challenges for researchers in the field. This work has the objective of analyzing the effects of the addition of two reinforcements - jute mesh and microfiber of vegetal origin - in the tenacity of fiber cement. To minimize alkaline attack on the fibres, some part of the cement will be replaced by active silica or rice husk ash,  and to minimize the accelerated degradation of the reinforcements the cure will be autoclaved. It is expected that (a) the addition of the material with pozzolanic properties, (b) the combination of two types of vegetable reinforcement and (c) accelerated autoclave cure may contribute to the quality of the cementitious composite, mainly with tenacity gain.

MEMBROS DA BANCA:
Presidente - CONRADO DE SOUZA RODRIGUES
Interno - JUNIA NUNES DE PAULA
Interno - MARIA CRISTINA RAMOS DE CARVALHO
Externo ao Programa - MARIO GUIMARAES JUNIOR
Externo à Instituição - LUIS EUSTÁQUIO MOREIRA - UFMG