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Three Stages of Deterioration
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Asphalt
deteriorates in stages, slowly at first then more rapidly as the elements
attack the pavement composition.
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Stage
I |
The surface color fades
to gray as a result of oxidation. Surface oils begin to evaporate. |
Stage
II |
Fine line cracking occurs
along with loss of "fines" (minute crushed material); the surface becomes
increasingly brittle. |
Stage
III |
Deterioration accelerates
with extended cracking, increased brittleness, increased viscosity, and
reduced flexibility. Foreign matter (oil, water, fuel spills, salt, etc.)
penetrates through cracks, further hastening the deterioration from below
the surface. |
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Once Stage III is reached,
the only practical solution is a very costly and time-consuming overlay. |
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The time to arrest the aging
process is during Stages I and II. |
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