Banca de DEFESA: JÔNATAS MACÊDO DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JÔNATAS MACÊDO DE SOUZA
DATA : 11/03/2019
HORA: 09:00
LOCAL: Auditório do CT
TÍTULO:

SOIL-CEMENT BRICKS MANUFACTURED WITH CASSAVA WASTEWATER IN SUBSTITUTION OF WATER

PALAVRAS-CHAVES:

Cassava wastewater, agro-industrial waste, solid brick, soil-cement, sustainability.

PÁGINAS: 62
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Construção Civil
RESUMO:

The construction industry is, admittedly one of the biggest consumers of natural
resources on the planet. The amount of research aimed at reducing the impacts caused
by the sector has grown considerably in recent years. The development of new

construction materials, which contribute to the reduction of environmental impacts in
the sector, while complying with current standards, has been debated and studied by
researchers. One of these materials is soil-cement brick, considered an ecological brick
and has presented enormous potential for the incorporation of waste from several
industries, which need studies for treatment and/or reuse such as ceramic residues, rice
husks, residues of PET bottle, etc. An environmental liability that requires research to
be reused is cassava wastewater, an industrial byproduct (effluent), from the pressing of
cassava in flour houses, which has a great degradation power due to its high toxicity and
concentration of matter organic. Some authors have researched alternative solutions for
the treatment or destination of this residue, and the production of bricks is one of them.
Therefore, this research aimed to evaluate the physical, mechanical and microstructural
properties of solid soil-cement bricks, produced with cassava wastewater instead of
water. After the characterization of the materials composing as soil-cement
formulations, 3 complete 2k experimental designs with 3 central replicates were
designed with the aim of reducing the number of samples produced. The bands of the
materials used were defined in 6% and 12% of cement, 0% and 100% of cassava
wastewater replacing the water and the age of the tests at 7, 28 and 49 days. Thus, 5
formulations were studied. The compressive strength tests were performed at 7, 28 and
49 days. And the water absorption and modified durability tests were performed at 7
days. In the later age, the microstructure of the bricks with 12% cement and 0% and
100% of cassava wastewater and 9% of cement and 50% of cassava wastewater was
studied by means of X-ray diffraction and scanning electron microscopy (SEM). The
formulation with 12% of cement and 100% of cassava wastewater presented the best
result in the 7 days compressive strength test, reaching 4.9 MPa. In the water absorption
test, the same formulation also showed the best performance with the absorption of
13.45%. In relation to the modified durability test, the composition 6% of cement and
100% of cassava wastewater had the lowest mass loss, with 0.4%. In tests of X-ray
diffraction, it was possible to identify the phases kaolinite, quartz, calcite, CASH
(calcium aluminate silicate hydrate) and CSH (calcium silicate hydrate) in all samples
analyzed. In the SEM, it was possible to verify the good densification of the samples,
the soil particles, and typical CSH structures. It is worth mentioning that the bricks
produced with cassava wastewater presented higher results than those obtained in the
formulations that did not use the residue. It is possible to conclude that the results

demonstrate the technical feasibility of the use of cassava wastewater instead of water in
the production of soil-cement bricks, for use in masonry without structural function.

MEMBROS DA BANCA:
Interno - 671.403.354-00 - KLEBER CAVALCANTI CABRAL - UFERSA
Interna - 1717461 - LUCIANA DE FIGUEIREDO LOPES LUCENA
Externo à Instituição - VAMBERTO MONTEIRO DA SILVA - IFPB
Presidente - 1149564 - WILSON ACCHAR