In recent years, the using of modifiers was used to improve the performance of asphalt 
binder and asphalt mixtures. In this research, metakaolin material is investigated as an 
additive to modify asphalt cement properties. A comparative test program was 
conducted on asphalt binders and asphalt mixtures to assess the effects of nano 
metakaolin (NMK) material on pavement performance. The NMK material was used 
instead of part of the asphalt binder with different percentages (0%, 2%, 4%, 6%, 8%, 
and 10%) by weight. A number of basic tests were conducted on asphalt binder such as 
the penetration, softening point, flash point, and absolute viscosity tests. Furthermore, 
standard Marshall, loss of stability, and rutting tests were carried out on asphalt 
mixtures. The results indicated that the physical properties of the modified asphalt 
binder with NMK material were improved. Moreover, the use of NMK material has 
greatly affected the pavement resistance to deformation. Finally, using the NMK 
material with a percentage of 6% by weight of asphalt binder achieved a greater 
improvement in the mechanical properties of the modified mixtures