Avaliação de utilização e desempenho de resíduos de construção e demolição em bases e sub-bases de pavimentos flexíveis
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2008-08-21
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Universidade Federal de Goiás
Resumo
The increase in the generation of Construction and Demolition (C&D) waste and their
subsequent accommodation have become, along with other urban problems, one of the major
obstacles faced by Brazilian society. The debris generated by construction, renovation and
demolition have, generally, high volume and high specific weight (relationship between mass
and volume), which makes their transport and final disposal laborious. Besides, these
materials are responsible for the rapid filling of available landfills and, when deposited
irregularly, they cause potential social and environmental problems, such as the proliferation
of vectors of urban diseases, which mainly affect the outskirts of large cities. One of the
alternatives that can minimize the socio-environmental problem is the reuse of C&D
aggregates in urban roads with low traffic volume. In addition to presenting one possible
solution to an environmental issue, the provided alternative can minimize significant
problems in the construction chain, once deforestation and depletion of natural sources often
occur in the construction of roads. The alternative use of C&D as constituents of the structure
of roads is the theme of this dissertation. Through laboratory tests, the physical and
mechanical properties of three doses containing recycled aggregates were determined, to use
as reinforcement of natural terrain, sub-base and base. The laboratory tests involves the
compaction of the samples with Proctor’s modified energy and consequent evaluation; Limits
of Atterberg; Specific weight of grain; Water absorption of the large stage of the aggregates;
check the pH as a measure of occurrence of pozolanic reactions (self-cementation) and tests
of expansion and California Bearing Ratio (CBR). With laboratory analysis, was evaluated a
case study - two experimental tracks built in Goiania, Goiás. The first one has total length of
56 meters built with recycled aggregates in its base and sub-base layers, and the thickness of
these layers is fifteen centimeters each. This track was executed at the buyers entrance of
CEASA-GO. The second experimental track is a street built on Recanto of Minas Gerais and
has total length of 140 meters long, whose base has thirty centimeters of thickness and was
executed with recycled aggregate of RCD in its layers. The field tests covered the resistance
to penetration with Dynamic Cone Penetrometer (DCP), measurement of total and partial
deflections with Benkelman Beam and proceed the investigation with Plate Load tests. The
results of laboratory experiments indicated that the samples could achieve Brazilian standards
for its uses in bases and sub-bases of flexible pavements. The results of field tests indicated
that the tracks still have good structural behavior, after a period of approximately four years
old, which supports the technical viability of the application of recycled aggregates from
construction and demolition in flexible pavements.
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QUINTANILHA, F. S. Avaliação de utilização e desempenho de resíduos de construção e demolição em bases e sub-bases de pavimentos flexíveis. 2008. 114 f. Dissertação (Mestrado em Engenharia do Meio Ambiente) - Universidade Federal de Goiás, Goiânia, 2008.