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YEAR 1
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New asphalt overlay is young and full of life, with recommended amount of up to 7.5% asphalt by weight, mixed with small stones. Compaction good.
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YEAR 2
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Evidence of oxidation (burn-out caused by sun) appears as lot starts looking faded and gray.
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YEAR 3
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Oxidation continues, surface asphalt releases and is washed away, leaving embedded rock sticking up (raveling). Ability to repel moisture diminishes.
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YEAR 4
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Oxidation continues. Raveling becomes more pronounced. Surface hairline cracks (crazing) may appear as deterioration progresses.
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YEAR 5
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Deeper cracks develop, allowing water to enter. Surface fading and raveling continue.
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YEAR 6
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Water below pavement surface freezes and expands, causing upward movement of asphalt sections (upheaval). Other areas sink (grade depression). Breaking apart begins.
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YEAR 7
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Large cracks appear where asphalt sections move. Chuck-holes develop. Large quantities of water can now enter substrate.
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YEAR 8
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Deterioration is so serious that chucks of asphalt overlay are loose. They become displaced with car traffic, foot traffic and running water
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YEAR 9
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Asphalt pavement is no longer functional. It?s an eyesore; it?s beyond repair and must be replace.
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The ideal time to start a preventive maintenance program on the asphalt lot described above is in Year 2. Cleaning and sealing with one of TRC?s top quality Asphalt Pavement Sealers will extend the life of it. This simple procedure could also be used in Year 3 or Year 4. If the work is done in Year 5, 6, or 7 extensive crack and hole repairs will probably be necessary along with the sealing. Repairs are not practical after Year 7. 
