عنوان مقاله [English]
Pavement response to a variety of damages is affected by the bond between bitumen and aggregate (adhesion) which is strongly affected by moisture and moisture entering from the surface or substrates of asphalt pavement causing the aggregate to stripped. The result of moisture damage is commonly called stripping because the bitumen is separated from the aggregates and the aggregates remain uncoated. Various factors affect the moisture sensitivity of asphalt mixtures, which are generally divided into two categories: The first one is of internal origin and is directly related to the properties of the asphalt mixing constituents. In contrast, the second category is of external origin and is dependent on conditions outside the asphalt mixing system. Today, glasphalt technology is considered as an efficient way to reduce asphalt production costs, reduce fuel consumption, and reduce environmental pollution caused by the production of this type of waste. Despite the advantages of glasphalt, moisture damage is a weak point for these types of mixtures. The present study evaluated the moisture sensitivities of glasphalt and HMA and compared the performance of these two types of mixtures, along with the effects of two types of additives, nano hydrated lime and nano calcium carbonate on moisture damage. The moisture sensitivity of both types of mixtures was evaluated using a modified Lotttman test and a thermodynamic test of Wilhelm plate based on surface free energy methods. The results of the indirect tensile strngth test showed that the resistance of glasphalt in dry conditions was higher than that of HMA. However, glasphalt are exposed to wet conditions with a higher resistance to HMA. The results obtained from the thermodynamic test also showed that the modification of both types of asphalt binder (AC 60-70 and AC 85-100) using nano hydrated lime and nano calcium carbonate increases the total surface free energy and adhesion of the bonding of both types of base asphat binders. This increase improves the strength of mixtures made with this type of asphat binders against moisture damage of cohesion type, which is a positive effect in reducing the moisture damage.