Aged bitumen of good quality and properly stored will have better adhesion than unaged bitumen.

This is an unusual case, I recommend to repeat the tests.

Usually, for the same type of asphalt, unaged asphalt has lower viscosity than when it is aged and therefore should coat better the aggregates when it is unaged. Like Mr. Khaled Ramadan said, your results are therefore unusual. If you are sure about your test results, then you should add more info about the type of asphalt used, the aggregate type, and the testing temperatures.

Did you use the same type and physical characteristics of aggregates??. The aggregate surface micro texture may be a reason for the results.

Agreed with Mr. Khaled Ramadan. it may happen due to the change in properties of material used or may be due to the lake of precision in test conducted.

Adhesion is largely determined by the structure and viscosity of bitumen. With aging, the viscosity increases, which leads to an increase in adhesion.

Adhesion can depend on surface texture aggregates, mineralogy(Charges) of aggregates and viscosity of bitumen. However, aged bitumen has more negative charges compared to zeta potential level. That's why aged bitumen show good adhesion compared to virgin bitumen.

Thanks alot

Thanks alot . Your answers helped me alot