For the pavers I used a standard paving shader with bump map. Then I overlaid a "patchy" texture over that and played with
the bump, transparency and shininess/reflection sliders. I am not 100% happy with the result yet.
I achieved better results in a earlier render (see attached) where I used a slightly different method with tarmac instead of pavers.
If I remember correctly I created a tarmac shader incorporating a reflection map that allows for certain areas to be more reflective
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