Asphalt Rubber Seal Coats

How many cracks can you fill in one day?

Is there a better way to take care of these cracks?

A seal coat alone will not do the job with monster cracks!

Asphalt Rubber Blend Site

Distressed Surface

Asphalt Rubber Binder Application

Pre-Coated Aggregate Application

Longitudinal Joint Overlap

Rolling

Sweeping Loose Aggregate

Finished Surface

Fog Seal Application

Comparison

The difference AR Seal Coat makes

A good candidate for AR Seal Coat:

Lots of cracks, but structurally sound.

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

Seal Coat - US 90, near Big Bend National Park

US 90, crack disappearing in 10 year old Seal Coat

Eight year old Seal Coat

Seal Coat on IH-10 near Van Horn

Five years old

Seal Coat on IH-10 near Van Horn

Five years old

Not all AR Seal Coats Turned out good

Grade 4 Seal Coat

Another bleeding Seal Coat

Smaller grade 4 Aggregate will sink into the AR Binder

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

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