City of Tacoma Asphalt Patch on Difficult Terrain with UPM® Cold Mix
UPM SUCCESS with City of Tacoma, WA. A challenging test for any cold mix. UPM stays in place where others fail.
Installed March 2010, in an area that has failed MC (medium cure) cold mix, QPR and other patch materials.
See picture Main & 1.
This road is in terrible shape and the city is not planning to repave.
Bob Gunther, the city manager wanted to try UPM in this area as nothing they have tried worked.If it works here it will work anywhere.
See picture 2.
The street is made with what they call ‘sheet asphalt’. Essentially sand and asphalt from 30 – 40 years ago. It has a couple of chip seal layers on top. There are several areas in the city with streets made with this kind of asphalt and in this condition. He wants to see how long UPM will last, and if it will lengthen the time between repairs.
See picture 3.
The following pictures from follow up inspection May 2010 demonstrate the superior performance of UPM as it stays in place where other patch materials fail.
The city confirmed that UPM performance would lengthen the time between repairs to this street and others in this shape throughout the city.
See picture 4,5 & 6
The City of Tacoma was incredibly pleased at the performance of UPM in these conditions.
The road is rutted with deteriorating surface. It has been a wet spring and all patches are holding up where other have not.
UPM is the only material that has worked in this road.
The demonstration compared UPM seasonal winter grade bag material to competitive bag material. City crews welcomed the seasonally adjusted workability to improve ease and quality of installation as they use year round.
Storage life is a critical element for the city as previous products had to be mixed as needed. The UPM storage life will create opportunity to improve production economics.
Road crews prioritized multiple parameters to evaluate materials; listed in order of priority:
- Product performance
- Ease of application
- Locally available
- Weather conditions were wet and demonstration area was not cleaned of free debris.
- Installation method was throw and roll.
- Traffic was high volume and heavy loads.
- Surrounding asphalt was deteriorated.
See picture 7