Name: LIGIA ABREU MARTINS
Type: MSc dissertation
Publication date: 14/06/2017
Advisor:
Name |
Role |
|---|---|
| PATRÍCIO JOSÉ MOREIRA PIRES | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| JAMILLA EMI SUDO LUTIF TEIXEIRA | Internal Examiner * |
| PATRÍCIO JOSÉ MOREIRA PIRES | Advisor * |
Summary: One of the relevant issues about the geotechnical behavior of sanitary and industrial landfills is
the integrity and performance of impermeable barriers throughout the useful life of these
containment systems. In this context, it is noted that some questions about permeability, shear
strength, the effect of solutions percolation and the integrity of impermeable barriers have been
discussed for some time. At a national level, the works of Lukiantchuki (2007), Camargo (2012)
and Morandini (2015) can be quoted. Nevertheless, due to the heterogeneity of the soil and the
country's great extension, these issues have not been satisfactorily resolved in Brazil. In this
context, it is relevant that, in the face of increasingly severe environmental policies, industries
have been led to adopt procedures for a better removal of toxic elements from effluents. To the
possible to avoid major environmental impacts and to minimize the risk of contamination for
soil and groundwater under waste containment systems, zeolite, minerals as adsorptive material
used in permeable reactive barriers for remediation of groundwater contaminated by heavy
metals, can be used as alternative material in constructions of landfill bottom liners. For these
analysis, this research project intends to evaluate the influence of adding bentonite for the
improvement of a tropical soil of the Espírito Santo State and adding natural zeolite of
clinoptilolite type with the purpose of using it in impermeable barriers. The permeability and
the shear strength, along with the expansion of the materials, were evaluated in the pure state
and in the alternative mixtures in bentonite percentages of 3%, 5%, 7% and 9%. To determine
the conductivity hydraulic the laboratory test involves flexible wall permeameter. The shear
strength was evaluated by means of uniaxial compression test with compacted soil. In order to
reach better results, California bearing ratio (CBR) and confined expansion tests have been
made. The addition of bentonite considerably reduced the hydraulic conductivity of the local
soil and the zeolite. The results indicate that, for all alternative mixtures, the hydraulic
conductivity showed adequate values for the construction of impermeable barriers. Regarding
the resistance to uniaxial compression test, all pure soil mixtures and only the 3% bentonite
zeolite blend reached acceptable values for use in compacted landfill layers. As for the CBR,
both materials presented acceptable values and the pure zeolite and its mixtures exceeded the
local values of the soil.
Keyword: Landfill. Imper
