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Long answer - depends on how old the concrete is supposed to be - newer concrete will be darker due to the water content while older concrete will be lighter although it will show darker streaks from traffic and use - in addition on older concrete, the edges will be chipped and lighter as well.

Hope this helps
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Short of that, I say drybrushing.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778564.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778564.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778790.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778790.page GMT
If you're talking about ruined structural concrete, don't forget to include some reinforcing steel sitcking out of the broken areas and rust it all up ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778890.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778890.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778917.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778917.page GMT
The same principles should apply to minis.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778927.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3778927.page GMT
What I would then add is a dry rush of Kommando Khaki.

With all coats try to mottle the paint as concrete is rarely homogenous.

GW seem to favour a bluish hue ti their buildings if that is what you wish to copy.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3779031.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3779031.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3779692.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3779692.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3779859.page http://www.dakkadakka.com/dakkaforum/posts/preList/422591/3779859.page GMT