Milad Tajdini - Ph.D. Geotechnical Engineering,
Seyed Mahdi Mostafavi, - Bs.C. Civil Engineering IAU Saveh
Seyed Ahmad Mirsaneyi - Bs.C. Architect Engineering Kosar University

Asphaltic concrete has been used as waterproofing core in embankment dams, since ۱۹۴۸. In this application, granular materials are used around the asphaltic concrete as filter, which makes a complicated behavior in the interface and needs to be researched by experiments and modeling. This paper describes experimental work and the results of investigating the mechanical behavior of the interface between aggregates and asphaltic concrete. Small scale shear strength test has been used in this study, in which the shear surface is considered as the interface. The effect of bitumen penetration grade, moisture, density and angularity of aggregates on the shear strength parameters at different levels of normal stresses and a constant shear rate have been studied. The results show that the shear strength parameters increase with increasing the density and normal stress level. It is also shown that the shear parameters decrease with increasing moisture content in the interface. Increasing in relative density improve the parameters of interface.

Asphalt Concrete; Sand Material; Interface; Relative density.