asphalt rubber seal coats. how many cracks can you fill in one day?
TRANSCRIPT
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Asphalt Rubber Seal Coats
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How many cracks can you fill in one day?
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Is there a better way to take care of these cracks?
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A seal coat alone will not do the job with monster cracks!
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Asphalt Rubber Blend Site
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Distressed Surface
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Asphalt Rubber Binder Application
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Pre-Coated Aggregate Application
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Longitudinal Joint Overlap
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Rolling
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Sweeping Loose Aggregate
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Finished Surface
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Fog Seal Application
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Comparison
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The difference AR Seal Coat makes
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A good candidate for AR Seal Coat:
Lots of cracks, but structurally sound.
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Texas Experience with AR Seal Coat
• First use was in 1976 in Bryan and El Paso districts
• Between 1976 and 1981, 850 miles of AR seal coat was placed
• By 1990, 2,000 lane miles of AR Seal Coat was placed
• More than 20 districts have placed AR Seal Coat since 1976 in 70 counties
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Seal Coat - US 90, near Big Bend National Park
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US 90, crack disappearing in 10 year old Seal Coat
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Eight year old Seal Coat
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Seal Coat on IH-10 near Van Horn
Five years old
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Seal Coat on IH-10 near Van Horn
Five years old
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Not all AR Seal Coats Turned out good
Grade 4 Seal Coat
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Another bleeding Seal Coat
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Smaller grade 4 Aggregate will sink into the AR Binder
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Performance of AR Seal Coat
• Experience has mostly been satisfactory
• Good construction practices are a must!
- Clean or pre-coated aggregate
- Chip spreader staying close to distributor
- Adequate curing of AR
- Correct binder shot rate and aggregate rate
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Performance of AR Seal Coat
• Shot rate must correspond to aggregate top size:
- Grade 3 vs.. Grade 4 aggregate
- Earlier problems with flushing were most likely due to aggregate size