I think nanotechnologies can be used anywhere today, even for road construction, but I'm not sure if they started to use it in this field. Anyway, in the attached link you can find a nice book talking about this, it's called (Nanotechnology in Civil Infrastructure), and the chapter 2 (Page 49 to 83) it's exactly what you are looking for (Applications of Nanotechnology in Road Pavement Engineering).
Nanotechnology knowledge and analysis methods (equipments and tools) is very promising for the future construction materials, as for example the additives for the introduction or increase of healing effects.
Abdelmalek Benkouider I agre with you and I think in near future every industry will be in close touch with nanotechnology, it should be if we want better tech in our future.
Thank you for the book you provided to me, I will read it when I get time...
Rui Micaelo thank you to for your time and your opinion I totaly agre with you.