If where you live in Canada remains around freezing all year, a concrete
patch on asphalt might survive but in moderate and hot climates the
modulus of concrete is far higher than asphalt which means it will crack
when stressed as the underlying asphalt is much more flexible.
But topping solid concrete is a whole lot different than topping
deteriorated asphalt - and it is virtually impossible to get the
asphalt clean enough to bond concrete to it effectively.
The bonding agent is basically white glue
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