Banca de DEFESA: JERONIMO COURA SOBRINHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JERONIMO COURA SOBRINHO
DATA : 23/05/2019
HORA: 15:00
LOCAL: CEFET-MG, Campus II, 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 researches on the use of alternative fibres to replace that mineral. Cementitious composites reinforced with alternative fibres especially natural ones are considered eco-friendly and of low cost besides coming from renewable resources. 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 also to minimize the effects of alkaline attacks. The most used natural fibres in composites are sisal, jute, curauá, cotton, flax, hemp, ramie, bamboo and plants such as eucalyptus and pine. The researches involving natural fibers on composites have evaluated the mechanical performance and the durability of the material, in the search of compositions that guarantee the compatible characteristics to some applications. The chemical composition of natural fibres of vegetable origin (cellulose, hemicellulose and lignin), besides being responsible for the bonding 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 researches 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, part of the cement was replaced by rice husk ash, and to minimize the accelerated degradation of the reinforcements the fibers received alkaline treatment. Both the addition RHA and the combination of two types of vegetable reinforcement contributed to the performance of the cementitious composite, mainly with tenacity gain.

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