TITLE:
Zeta Potential of Aggregate and Dynamic Modulus of HMA Estimation Using Aggregate Silica Content
AUTHORS:
Mouhamed Lamine Chérif Aidara, Serigne Touba Thiam, Alan Carter
KEYWORDS:
Basalt of Diack, Quartzite of Bakel, Limestone of Bandia, Complex Modulus Test, Binder-Aggregate Adhesiveness
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.13 No.1,
March
8,
2023
ABSTRACT: The mineralogical composition of an aggregate influences its adhesion
with bitumen and therefore its dynamic modulus. However, few studies have been
conducted on this aspect. One of the most used properties to describe the
impact of aggregate on the adhesiveness phenomena is the zeta potential. In this
study, the first mineralogical and chemical properties were considered through
the percentage of silica in the rock source of aggregates and the electric
aggregate particles charge zeta. Dynamic modulus values used for regression
process are determined from complex modulus test on nine asphalt concretes mix
designed with aggregate types (basalt of Diack, quartzite of Bakel and
Limestone of Bandia). The results showed that aggregate with high percentage of
silica have higher zeta potential than aggregate with low percentage of silica.
The development of a zeta potential predictive model showed a strong
sensitivity to silica. The results of the complex modulus tests showed that Hot
Mixture Asphalt (HMA) mixed with aggregate containing high silica contents gave
better results than those mixed with aggregates containing low percentage of
silica. The dynamic modulus predictive models of HMA developed shows that it is
the properties of bitumen that influence more. However, the effect of silica
although low, is very marked at low temperatures and high frequencies.