Abstract
A large number of additives are introduced in asphalt concrete mixtures in purpose of improving the properties of resistance, facing the increasing traffic and more severe climatic conditions. This will guarantee the good comfort for a longer exploitation time. In this article we used graphite powder as an unconventional additive, and then investigate its effect mainly on the electrical resistivity which is in context of our research work on conductive asphalt (with a resistivity around 106 Ω m), As well as on its mechanical properties evaluated using the new Fenix test that gives many information of mechanical especially dissipated energy. A significant improvement was noticed in the reduction of resistivity by reaching 1.7 × 106Ω m and also greater resistance to cracking based on variation of dissipated energy as a result we concluded that introducing graphite powder with an appropriate amount enhance both mechanical and electrical properties asphalt concrete. Doi: 10.28991/CEJ-2022-08-01-09 Full Text: PDF
Highlights
Asphalt is the most used material in the world as a binder for wearing course in pavement structures, improving its performance has been the axe of several research works for a long time
When the filler loading reaches pc, the conductivity of the composite rises suddenly and the graph of conductivity versus loading takes the characteristic S-shape, demonstrating the three characteristic regimes: insulating, percolating and conductive (Figure 11) [10,11,12,13]. It is observed in several research works on conductive asphalt “as mentioned in the introduction section” in these works the electrical resistivity of the material decreases slightly with the added content, reaching a critical value, called the percolation threshold marked by a strong decrease of the resistivity
In This study we investigated the effect of graphite powder as a non-traditional addition on the properties of the electrical conduction of asphalt to show the possible improvement of electrical conduction which is a part of our research on conductive asphalt
Summary
Asphalt is the most used material in the world as a binder for wearing course in pavement structures, improving its performance has been the axe of several research works for a long time. In this context, research is being carried out to optimize formulations by various methods (Marshall, super pave), as well as to better characterize its mechanical characteristics by developing control tests. At low temperatures in winter the bitumen hardens and becomes brittle, which promotes cracking, And at high temperatures in summer, its tendency to viscosity increases and favors permanent deformations such as rutting. The requirements needed are the resistance to thermal cracking at low temperature and to permanent deformation at high temperature
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