Asphalt is good for bearing loads of moving objects. Concrete is superior when it comes to withstanding static loads (stationary aircraft)
Have a look at this thread Concrete or Asphalt?. This topic has already been touched upon.
And when it comes to implementing varying damage rates based on surface; if you have an asphalt stand, damage should rapidly increase. Same goes for concrete runways and taxiways. If you use concrete stands and asphalt runways/taxiways, your damage rates should be lesser than in the previous case.
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