masterThesis
Uso de rejeito do beneficiamento de granito para substituição parcial de um solo em camadas de pavimentação
Fecha
2019-07-30Registro en:
SANTOS, Natalia Medeiros dos. Uso de rejeito do beneficiamento de granito para substituição parcial de um solo em camadas de pavimentação. 2019. 78f. Dissertação (Mestrado em Engenharia Civil) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2019.
Autor
Santos, Natalia Medeiros dos
Resumen
The pollution produced by mining activity is one of the main issues discussed in
today's society. Global concern on the subject raises mainly from the
consequences endured by the planet, encouraging the adoption of effective and
less damaging measures to the environment. Environmental issues caused by
mining tailings generated at the granite processing stage are evidenced in the
local context. The mining tailing used in this study originates from a mineral
deposit encountered in the Seridó region of Rio Grande do Norte state, more
specifically located between Caicó and São Fernando cities. Therefore, this study
aims to partially replace the local soil with the incorporation of a mining tailing
from granite processing in the proportions of 10%, 20% and 30% to the final
mixtures of the paving layers. Trials were conducted at the Soil Laboratory of the
Federal University of Rio Grande do Norte (UFRN) and NUPPRAR/UFRN in
order to assess chemistry, mineral, physical and mechanical properties. The
obtained results demonstrate that only the sample containing 10% of a mining
tailing from granite processing (AM03) was efficient to the three types of paving
layers (base, subbase and subgrade). The analysis of the other samples
presented exceptions related to the CBR results or to the expansion.
Furthermore, it was appraised the results of a simulation concerning economic
feasibility of the sample that presented the best performance based on the cost of a road paving work auctioned by the Infrastructure Superintendency –
INFRA/UFRN. The soil replacement in subgrade and base layers by the material
accounted at zero cost caused a reduction of less than 1% of the total value of
the work. Although the partial replacement of the soil by 10% of AM03 presents
a low-cost reduction, the incorporation of such sample to the final mixture is
sustained by environmental benefits that do not encumber the total value of the
work.