The USA doesn't really do PhDs in construction that I have ever heard of. We tend to lump them with engineering. In which case, it would really depend on what kind of school you want. It also depends on what specialty you were looking for (industrial, etc.) www.gradschools.com is a great source for finding a school. It is dedicated to Master & Doctorate schools, you can search by degree and state. Then just check out the universities that pop up. I know there is a yearly ranking put out for undergraduate schools, but I don't know if one is put out for graduate programs. Good luck!