Estudo laboratorial de misturas asfálticas a quente utilizadas em Goiás
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2015-08-28
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Universidade Federal de Goiás
Resumo
Flexible or asphalt pavements compose the Brazilian highway network, which have to
promote security on traffic on the highways, to support the effects of changes in climate and
to resist the traffic of vehicles. By this reasons, the structure of the pavement is particularly
important and must be constituted by layers, which can distribute the loads into the structure,
reducing the vertical load produced by the action of traffic and, consequently, providing
protection to the subgrade. In the middle western Brazil, in the state of Goiás, there is not
advanced studies on asphalt mixtures used in highways and in urban pavements, and there is
not a technical scientific proofing that the local aggregates available in the region, is the best
option considering the local conditions. Forward better conditions of infrastructure, it is
proposed to develop more efficient asphalt mixtures for pavements, by submitting the
mixtures through analysis of mechanical strength and performance test, analyzing if the most
used asphalts mixtures are satisfactory or not. The hot asphalt mixture are composed by
aggregates and asphalt binders that are design in order to attend the parameters set in the
projects according to demand and traffic types. In this research, it was proposed the study of
six asphalt mixture design with different types of asphalt binders with the same aggregates
origin in a different grain size range (Bands B and C). The binders used in this study are the
conventional cement asphalt in the region, CAP 30/45 e 50/70 (Brazilian penetration grade),
with low and medium penetration, respectively, and the polymer modified asphalt (AMP).
The CAP 50/70 is the most used conventional binder in the region, followed by CAP 30/45.
Tha AMP binder is not often used. The characterization tests of the materials that composed
the mixture are presented and their selection and characterization attended the standardized
procedures and requirements by the brazilian department responsible for highway structures
(DNIT). In a second stage, the design tests were performed, combining aggregates and
binders in different rates, by the Marshall Mix Design Method using manual compression,
until the great design was obtained The laboratory tests were realized with this great design to
analyze the mass loss and obtain its mechanical properties, given by the tensile strength (RT).
Performance tests were realized to obtain its resilient modulus (MR) and, using wheel
tracking test, to obtain the permanent deformation (DP). The results showed that the common
hot mixture asphalt used in the region (range C and CAP 50/70), is not a good option, because
its performance is not satisfactory. Therefore, the range to be used, and the binder, must be
analyzed for each traffic level. It is also recommended to evaluate the Marshall methodology
for design mixtures, considering mainly the compression way and the determination of the maximum densities.
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Citação
PRUDENTE, Carolina Queiroz Arantes. Estudo laboratorial de misturas asfálticas a quente utilizadas em Goiás. 2015. 113 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2015.