ARAÚJO, N. S.; http://lattes.cnpq.br/0259893338999276; ARAÚJO, Nathália Silva de.
Resumo:
Granite aggregate is widely used in the paving industry because of its satisfactory
properties of strength and durability. However, in some regions, such as northern Brazil,
there is a scarcity of granitic aggregates and the cost of transportation of the granite
aggregate (from the region of origin to the work) makes it more expensive and makes its
use impracticable. In this case, the solution is to adopt the existing material in the
region. Lateritic concretions are found in almost all of Brazil as a soil typical of tropical
regions. The objective of this research was to investigate the use of laterite in asphalt
mixtures, replacing the traditional aggregates. In order to reach the proposed end,
characterization tests of the CAP50 / 70 and of the aggregates and mechanical tests with
the asphalt mixtures were carried out. The dosage of the mixtures were performed
according to the SUPERPAVE methodology. The results showed that the lateritic
aggregate has high porosity, low durability and tackiness to the binder. However, the
characteristics presented in the asphalt mixtures with lateritic aggregate proved to be
satisfactory for most of the tests, as for example the RT, Marshall and MR stability
tests. It is concluded that although the lateritic aggregate presents individual
characteristics unsatisfactory, this aggregate can be used in asphalt mixtures, being an
alternative source for paving for regions in which there is scarcity of the granite
aggregate.