There are a few reasons to explain it is better to remove concrete before laying asphalt. First is to build the right pavement subbase. The big problem with laying asphalt pavement over concrete has to do with the initial preparation of the site. With concrete, if you are concerned about strength and stability, the solution is to simply lay a thicker slab. Because of this, contractors laying concrete rarely worry too much about preparing the base.
The second is to prolong the longevity of the pavement. When asphalt pavement are poured over concrete which rests on an unstable base, the resulting asphalt pour is going to be prone to instability. Expansion joints in the concrete will quickly turn into cracks in the asphalt, which will require costly ongoing repair jobs. In extreme cases, shifts in the ground could crack the entire surface, just as a house's foundation may crack if improperly laid.
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