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Development of a Dynamic Modulus Prediction Model for Hot Mixture Asphalt and Study of the Impact of Aggregate Type and Its Electrochemical Properties

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Document pages: 13 pages

Abstract: The most famous model known in prediction of dynamic modulus for asphalt concretes is the Witczak and Hirsh models.These models didn’t use the mineralogical and chemical properties of aggregates.Witczak models used the passing or refusal percentage to sieve diameters and Hirshmodel used the volumetricanalysis. All models developed until now considered that the aggregates were geotechnicalconforming to standards. In this study the first mineralogical and chemical propertieswere considered through the percentage of silica in the rock source of aggregatesand the electric aggregate particles charge zeta. Dynamic modulus values used forregression process are determined from complex modulus test on nine asphalt concretesmix designed with aggregate types (basalt of Diack, quartzite of Bakel and Limestoneof Bandia). Between Twelve initial inputs, the statistical regression by exclusion process keeps only seven parametersas input for the model. The mineralogical model showed good accuracy with R2 equal to 0.09. The student test on the model parameters showed that all the parametersincluded in the model were meaningful with good p inferior to 0.05. The Fisher teston the model showed the same result. The analysis of the sensitivity of the mineralogicalmodel to zeta potential showed that the dynamic modulus increases with the positive zeta-potentials and decreases with the negative zeta-potentials. The analysisof the sensitivity of the mineralogical model to the silica showed that the dynamicmodulus decreases with the increase of the silica.

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