CORDEIRO, J. F. S.; http://lattes.cnpq.br/7770410855093750; CORDEIRO, José Frankneto da Silva.
Résumé:
An oily residue resulting from petroleum drilling, extraction and processing, as well as filter and reservoir
cleaning and eventual oil leakage is produced. Transformation of this residue into environmentally inoffensive byproducts
is the objective of every company concerned with the environment that produces this type of material.
This study considered the possibility to use this residue as cementing agent to lime, using the
solidification/chemical stability technique. The experimental phase of this study was based on experience and
theoretical support from literature, as well as the selection of the trial methods. The trial phase was divided in four
moments: characterization of the physical properties of each component of the mixture, characterization of the
mechanical properties of the mixtures, characterization of the chemical characteristics of the soil, of the oily
residue and of the soil-residue-lime mixture, and statistical data analyses. A pilot trial using 25% of oily residue,
helped to decide the use of 3%, 4.5%, 6.0%, 7.5% and 9.0% of lime as agglomerant in the mixture. Lime
increments affected mixture moisture (%), dry apparent specific mass (g/cm3), CBR (%) and expansion (%).
Analysis of variance results showed a significant increase in mixture moisture, while dry apparent specific mass
decreased compared to natural soil. CBRs values increased, suggesting a strong increase in resistance
compared to natural soil and soil-residue mixture. Expansion values decreased significantly. In general, most of
the constituents that presented concentration higher than the specified by the NBR-10004/2004 guidelines had
their concentrations reduced after stabilization/chemical stabilization process. Exception was observed with
manganese, although this component was not below the maximum allowed value. This fact also corroborates the
advantage of the solidification/chemical stabilization process.
