CRF Seal

The City of Sunset Hills will be performing a restorative process using a CRF Seal on Eddie & Park this morning close to the Kitun Dog Park.  We are evaluating the effectiveness of this product on this Nova Chip surface.
The process involves distribution of an emulsified seal that includes Reclamite to help rejuvenate the asphalt surface. After the material has been down and has had a few minutes to react, ash will be applied as a blotting agent and traffic will be allowed on the road.

What is CRF?

CRF is made up of the same components as a Reclamite rejuvenating seal, which is an emulsion made up of specific petroleum oils and resins. The difference between the 2 products is the added ingredient in CRF of 11% asphalt. This product was created to restore older roads and add vital years at the end of the road’s life cycle. CRF, when used in concentrate, is also an effective crack filler.

Finished side on top in both pictures. Notice the smoother finish in the asphalt surface. The CRF material is filling in the voids of the asphalt.

How Does it Work?
Like Reclamite, CRF is an in-depth seal that penetrates through the surface of the pavement. Even though CRF contains 11% asphalt, it does not sit on top of the pavement. Through the extreme freeze thaw cycles of the Midwest, CRF continues to adhere to the pavement creating a single surface. CRF will not be peeled off the pavement by snow plows. CRF seals out water and resists oxidation, hence, extending the use of the road. In addition of the emulsion itself, application of sand, limestone or granite screenings are applied to add additional binder strength. The screenings are worked into the pavement from the traffic, creating a long-term seal.

When Should CRF be Used?
CRF is typically used towards the end of the pavement’s life cycle. The CRF Restorative Seal is a reactive approach to road maintenance because it is applied after the road has already experienced years of being exposed to the elements and natural wear and tear. The purpose is toward the effort of restoring and maintaining the current condition of older pavement. Perfect candidates for CRF are roads exhibiting increased raveling, loss of aggregate, and brittleness. Roads that have been treated with Reclamite rejuvenating seal in the early years of the pavement’s life cycle can use CRF Restorative Seal later in it’s life cycle. This will benefit the road by giving it maximum life.

How is CRF Applied?
Like Reclamite, CRF is applied like a fog seal. CRF is a more labor intensive application compared to Reclamite. Once the distributor applies CRF to the pavement, a truck with a brush on both ends follows and brooms the product into the pavement. This is done to push the product into the cracks and voids in the road. While it will not fill in large cracks it does add a bottom to them and creates a seal that keeps the elements out. Like Reclamite, CRF is left on the pavement for about 30-45 minutes to cure. Once the CRF has penetrated through the surface, a heavier application of sand, limestone or crushed granite is applied. Unlike Reclamite, some of the screenings used become a part of the pavement. A broom comes around again and brushes the screenings into the product. A few days later all excess screening are swept up. CRF does obliterate pavement markings because of the 11% asphalt. CAM recommends waiting about 2 weeks after the application before replacing the striping. CRF can be applied multiple times, depending on the condition of the road. CRF should be sprayed in the spring or fall because of the cooler temperatures. Spraying CRF in very hot temperatures can cause the product to become reactive and tacky.

Project Updates

  • May 1, 2017 - CAM reports they expect to be on-site at about 10am.