Banca de QUALIFICAÇÃO: RICARDO EUGENIO BARBOSA RAMOS FILHO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : RICARDO EUGENIO BARBOSA RAMOS FILHO
DATA : 13/05/2019
HORA: 09:00
LOCAL: Sala I11 - Setor de aulas IV
TÍTULO:

RESIDUE-CEMENT BRICKS OF RESIDUES FROM PROCESSING OF SCHEELITE, CRUSHING OF ROCKS AND CASSAVA WASTEWATER

PALAVRAS-CHAVES:

Waste from mining, agricultural business waste, brick residue-cement, ecological brick, cassava wastewater.

PÁGINAS: 100
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

One of the biggest consumers of natural resources on the planet is the construction industry. From mineral extraction, tons of waste are generated to use only the processed product, generating environmental impacts. The waste can be used as by-products for various industries, especially the construction industry. The agricultural business has generated impacting residues as in the case of the cassava wastewater that becomes a damaging effluent due to its toxicity by the excess of free cyanide. Several researches have been carried out with the use of residues in construction materials, highlighting the incorporation of residues in soil-cement bricks. This brick is also called ecological brick because it is not necessary to heat treatment for sintering of clay minerals, but the extraction of the soil, when not adequate, also promotes environmental impacts, being able to cause deforestation, silting rivers, among other impacts. This scientific work consists of the joint application of scheelite residue (SR) and rock crushing (RC) waste with the use of cassava wastewater in substitution of water to produce residues-cement bricks that have suitable physical and chemical properties for use by society. Using research and scientific method, an experimental planning with verification of tests was carried out, using material engineering in the analysis of microstructure, processing and properties. The physical, chemical and mineralogical characterization of the materials was carried out and then the compaction test to evaluate the best combination of the waste mixture, which was 50% SR and 50% RC. Tests were carried out with cylindrical specimens with cement and lime hydrated with water in order to determine the use and composition of the binders to produce the bricks. It were produced with cement at the levels of 6%, 9% and 12% with the use of cassava wastewater in substitution of water for 7 and 28 days of curing, being carried out the tests of resistance to simple compression and absorption of water. The formulations with cement at 6% showed average values around 2MPa and the formulations of 9 and 12% of cement were all values above 2 MPa, with no significant change in the resistance to simple compression with the curing time of 7 to 28 days, presenting better results than soil-cement bricks with 12% of cement in the same conditions carried out in this work. The results of the water uptake assay were all below 20%. The use of the cassava waste water was fundamental for improvement in plasticity, giving cohesion between the particles. The images provided by MEV presented morphologies like the cement phases of portlandite, ettringite and hydrated calcium silicates. It can be concluded that the objectives of this thesis were achieved by obtaining an ecological brick without soil use and with a suitable combination between residues, having reduced cement content, contributing to reduction of environmental impacts and can be used for masonry of sealing according to standard NBR 13553, generating a sustainable construction.

MEMBROS DA BANCA:
Externo ao Programa - 2351540 - PAULO ALYSSON BRILHANTE FAHEINA DE SOUZA
Externa à Instituição - PRISCYLLA CINTHYA ALVES GONDIM - IFRN
Externa à Instituição - SHEYLA KAROLINA JUSTINO MARQUES - IFAl
Externo à Instituição - VAMBERTO MONTEIRO DA SILVA - IFPB
Presidente - 1149564 - WILSON ACCHAR