Building, conserving and maintaining of
the national road network requires a very large investment, high levels of
quality and, at the same time, respecting environmental and sustainability
issues. These factors do not seem to coordinate with the new realities that
Angola faces, namely the scarcity of financial resources, the urgency to boost
the country’s development and the difficulty in acquiring suitable geomaterials
to be applied in road pavements. Therefore, the use of traditional materials is
increasingly preferred, which are increasingly scarce due to the demand that is
aggravated by other situations that affect the durability of the pavement,
namely: the climatic conditions of Angola, the high road traffic allied with
insufficient investments in road maintenance and conservation, services
necessary to ensure road safety and fluidity and, consequently, avoid the
depreciation of the road network and unnecessary costs. This article seeks to
present dolomitic limestone as an alternative material to be used in the base
and sub-base layers of road pavements since its physical, mechanical and
chemical characteristics seem to indicate that it can be applied in the
referred layers of the pavement. For this purpose, the samples were submitted
to laboratory tests such as: apparent density, water absorption and apparent
porosity, as well as, some resistance tests including uniaxial compressive
test, flexural test, Los Angeles Abrasion, Aggregate Crushing Value (ACV) and
the test method for soundness of aggregate by use of sodium sulfate (Na2SO4)
and magnesium sulfate (Mg2SO4). The results show that the rock is robust and
resistant to mechanical, physical and chemical wear so that it can be used as a
base and sub-base material of road pavements.
For more information: http://dx.doi.org/10.1007/978-3-031-51904-8_13
