Banca de QUALIFICAÇÃO: VICTOR PINHEIRO DA COSTA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : VICTOR PINHEIRO DA COSTA
DATA : 03/03/2017
HORA: 08:30
LOCAL: Setor IV, Bloco B, Sala 4
TÍTULO:

CHARACTERIZATION OF PEGMATITIC FELDSPAR MINING REJECTION FOR GEOTECHNICAL PURPOSES

PALAVRAS-CHAVES:

Mining residue; paving; Mortar with residue

PÁGINAS: 60
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Geotécnica
RESUMO:

The mining activity as any process of natural resource extraction causes impacts to the environment, be it with regard to alterations of natural areas by means of its exploitation or in the generation of residues, mainly arising from its mining or processing. Assuming that mineral resources are exhaustible and the construction sector is responsible for the consumption of up to 50% of all mineral resources exploited on the planet, it is essential to develop techniques for the reuse of mining waste in construction for reduce the use of natural goods and the accumulation of waste, thus minimizing the impacts caused to the environment. In this work, is presented a proposal for adequate disposal of the residues from the pegmatitic feldspar from the Parelhas / RN region, by including them in geotechnical works. For this, the feldspar mining waste (RLF) was subjected to a granulometric treatment process, obtaining a material with 100% passing through the No. 4 sieve (4.8 mm), which was subsequently subjected to tests of Physical, chemical, mineralogical and mechanical characterization. Considering the obtained results, it was concluded that these were characterized as non-plastic silt sand with a specific mass of solids equal to 2,556 g / cm3. The results of FRX showed an inert material with a high percentage of silica (64.13%) and aluminum (15.08%), presenting low content of total alkalis (10.62%) and high hematite content (5,25 ) In relation to the chemical requirements for their consumption in the ceramic and glass industries. It was designated as an A-2-4 material by HRB, presenting excellent penetration support capacity, and it can be used when compacted in modified Proctor energies under optimum conditions (ρdmax and wót) as a base element in pavements N<5.106. However, a 50% loss of ISC was observed for moisture contents equal to Wótimo ± 1, revealing the need for a strict control when applied to pavements. As for the shear tests in non-flooded conditions, cohesion values of 31.68 and friction angle ranging from 38 ° to 47 ° were obtained for the compaction energies Proctor normal, intermediate and modified. The flooding did not cause measurable changes in the values of the peak voltages, however, it resulted in lower residual stresses and the reduction of the soil deformation capacity when it was sheared. The RLF presented 83% of pozzolanic activity, a result that may be satisfactory in mortars and concretes, and further investigation in this area is required.

MEMBROS DA BANCA:
Interno - 2085750 - FAGNER ALEXANDRE NUNES DE FRANCA
Interno - 1284389 - MARIA DEL PILAR DURANTE INGUNZA
Interno - 1692497 - OSVALDO DE FREITAS NETO