Abstract
The compaction of a hot mix asphalt depends on a number of important factors whose control, during the execution of the pavement, is complex; however it is essential to achieve the results envisaged in the design with the least possible cost. Therefore, the evaluation of the effect of these variables on the material density is important as well as their quantification in real time. This research, starting from a survey of some environmental variables, together with the hot mix asphalt density using an electrical impedance device, through the application of a neuro-fuzzy technique, proposes a procedure to classify the most important features. These results can be rapidly deduced during the paving operations; calibrations required to correct the compaction can be applied on site without waiting further time necessary for the extraction of the cores and the subsequent laboratory analysis. In this way it is possible to identify with a better precision the aspects of the environmental context requiring more attention. In addition, the model permits the inclusion of new input variables and additional data that can be recorded in following phases.
Highlights
Compaction is the process by which the density of a hot mix asphalt is increased by using rollers to orient the aggregate particles in a better way (Scherocman, Martenson 1984; Scherocman 1984; Geller 1984; Brown 1984; Bell et al 1984; Roberts et al 1996)
Application The methodology described above has been applied to the lay down of a hot mix asphalt surface layer in a rural road located near the town of Messina (Italy)
The asphalt plant is near the construction site and this has allowed to the material to have temperatures high enough to ensure a reasonable useful period for compaction
Summary
Compaction is the process by which the density of a hot mix asphalt is increased by using rollers to orient the aggregate particles in a better way (Scherocman, Martenson 1984; Scherocman 1984; Geller 1984; Brown 1984; Bell et al 1984; Roberts et al 1996). In the construction of a road there are frequent cases where, due to inadequate compaction of the material, the pavement does not reach the constructional and functional standards required by the design. There are a lot of variables that influence the phenomenon and they are generally related to the environment, to the hot mix asphalt and to the construction operations. For this reason, researchers considered with great interest automated procedures that would allow the management of operations on site in an optimal way and in accordance with the economic constraints (Krishnamurthy et al 1998)
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