Potencial do uso de resíduo de mineração de rocha calcária para estabilização de solos expansivos
Mining residues can cause several environmental problems that compromise the sustainable development of a region. Adding to the problem of these residues, the occurrence of pathologies of works supported on expansive soils has been frequent, mainly in semiarid climate regions. The main objective of...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/45854 |
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| Resumo: | Mining residues can cause several environmental problems that compromise the sustainable
development of a region. Adding to the problem of these residues, the occurrence of
pathologies of works supported on expansive soils has been frequent, mainly in semiarid
climate regions. The main objective of this research is to evaluate the potential for reducing
the expansion of soils with the addition of limestone powder residue. The experimental
program was carried out in two stages: first, the physical and mineralogical characterization
of the materials; then, free swelling and swelling pressure. The tests were carried out through
flooding of specimens under tensions of 5kPa, 60kPa and 120kPa. The tests were carried out
in pure soil (S), in residue (limestone powder - LP) and in residue/soil mixtures in mass
proportions of 40%LP/60%S, 60%LP/40%S and 80%LP/ 20%S. The results showed that the
pure clayey soil has a high expansion potential, with free expansion of 39.1% and 1722.5 kPa
of expansion stress. The average reduction of free expansion varies from 62.5% to 90.5%, for
the addition of 40% to 80% of waste. In relation to expansion tension, the reduction varies
from 83.75% to 98.16%. The mixture 60%LP+40%S under a tension around 62 kPa, the soil
is stable to expansion. The 40%LP+60%S mixture for voltages around 280 kPa may not show
expansion. As for the ideal percentage, according to the results obtained in this research, the
use of a range of 40% to 60% of residue is indicated, depending on which stresses the soil
will be subject to. Thus, the results obtained in the study made it possible to verify that the
limestone residue can be used to treat expansive soils, acting in the form of granulometric
stabilization. The amount of residue needed for stabilization will depend on the expansion
potential and the working stress of the soil. |
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