Are You Considering Some Rubberized Asphalt in Your Bag of Maintenance Tricks?
Of All the things rubberized asphalt does, it DOES NOT waterproof!
For Waterproofing, You Need a Waterproofing Membranes!
Los Angeles County of Public Works/Materials Engineering Permaeablility of Asphalt Concrete, June 1993.
At 95 percent relative density, the dense graded asphalt had a low permeability. The samples with 5 percent asphalt averaged .36 feet per day with 8.9 percent air voids. The samples with 5.6 percent asphalt averaged.10 feet per day with 5.4 percent air voids.
At 95 percent relative density, the gap graded asphalt rubber samples with 8.2 percent oil averaged 2.0 feet per day permeability with air voids of 7.4 percent average.
Asphalt concrete containing asphalt rubber does not have a lower permeability than asphalt
concrete without asphalt rubber.
Relative density of 95 percent is a critical point in permeability ( with rubberized asphalt). The permeability increases rapidly as the density drops below 95 percent.
This is 5 to 20 Times More Permeable Than Conventional Asphalt! Remember, even if cracks do reappear, the membrane continues to waterproof.
Have You Considered Chip Seal Over Paving Fabric in Your Bag of Maintenance Tricks?
“Why?” you ask.
- It’s much less expensive than Asphalt Overlay.
- You get a Waterproofing Membrane.
- You get better skid numbers than Asphalt.
- You Get a new wear surface.
- There are no manholes to raise.
- And, there is no milling required.
Sacramento County Public Works, Chip Seal over fabric on Excelsior Road 12 test section approximately 1/3 mile each were installed with various chips with paving fabric in the
southbound lanes. The same chip seals in the northbound lanes were installed without paving fabric. All sections were rated by the County to have Pavement Condition ratings of 53 (fair) in 1994. Six rainy seasons later the sections were reevaluated. All sections with fabric were rated 83! That’s just 2 points below excellent. The sections without fabric varied from 46 to 65 with an average of 53.
The minimal cost of Paving Fabric raised the PCI’s 30 points!
County of San Diego
May 1997 asphalt contractor. In 1987, the County placed their first chip seal over fabric. Lita Davis, resident engineer, said this “performed very well in sealing and providing an all-weather surface for the roadway. It also reduced the need for crack sealing. Over 12 years and those have not required any maintenance since the original application. The 1999 project was almost 500,000 square yards”
City of Sunnyvale
Dave Trott reports the City has been doing Cape Seal over fabric for over 15 years. They
are currently doing over 1 Million square feet per year.