Construção e avaliação inicial de um trecho de pavimento asfáltico executado com misturas de solo tropical, fosfogesso e cal
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2010-08-13
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Universidade Federal de Goiás
Resumo
Presently in Brazil, there is a real difficulty to reuse solid waste. Among them, the
phosphogypsum, a byproduct of phosphatic acid production. The huge deposits of this waste
become problematic both environmentally and economically. Therefore, researches are being
conducted to find a reuse of this material in geotechnical engineering. In the specific case of
its application in paving, beyond reuse waste, seek to reduce the exploitation of natural
materials, traditionally used in construction of roads. Laboratory tests showed the possibility
of use of phosphogypsum in paving when mixed with soil or chemically stabilizer. Thus, this
study evaluates on field, the mechanical behavior of mixtures of phosphogypsum, tropical soil
of Aparecida de Goiania-GO and lime, when used in base layers of asphalt pavement. For
that, laboratory tests were performed to characterize the mixtures to be used on field and was
constructed an experimental pavement with mixtures of soil (80%) + phosphogypsum (20%),
soil (80%) + phosphogypsum (11%) + lime (9%), soil (91%) + lime (9%) and gravel (100%).
During the experimental pavement construction, field tests specifics of paving were
conducted, to check its good execution and evaluate its initial performance. To better
understand the behavior of the experimental pavement, a second step of field tests was
conducted, six months after the release of traffic. From this study, was been observed that
both in laboratory and field, the mixture soil (80%) + phosphogypsum (11%) + lime (9%) was
that which presented the best mechanical performances and can thus replace the gravel for
construction of low cost pavement. However, care should be adopted to control the expansion
of this mixture.
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METOGO, Daniel Arthur Nnang. Construction and initial evaluation of a stretch of asphalt pavement runs with mixtures of tropical soil, lime and gypsum. 2010. 196 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2010.