January 12th, 2011

FILLING POTHOLES

Preserve Infrastructure, Uncategorized, by Catherine Higgins.

The winter freeze-thaw cycle is asphalt’s arch enemy.

Workers use a hot method to fill a pothole near Echo Junction.

UDOT crews are out in full force this time of year doing their best to stay ahead of pothole proliferation. Because of the way they are formed, repairing the dastardly dips can be a real challenge.

From the bottom up

Usually a pothole starts when water seeps into a crack in the asphalt to the soil below. As ice forms in the water-saturated soil, the area expands and causes the asphalt to heave and crack even more. Warmer temperatures melt the ice and relax the soil and asphalt. The final blow comes when the weight of traffic causes the asphalt to cave in and form a pothole.

Traditional repair involves using asphalt to fix the pothole. Hot asphalt is the best repair because it seeps into the cracks and bonds well with the old material, but cold winter temperatures prevent its use.

Cold mix asphalt is stockpiled at UDOT maintenance sheds and used to fill potholes during winter months.  Sometimes a fix works well, but sometimes, the repair pops out during the next freeze-thaw cycle.

” When using cold mix, it’s a temporary repair until we are able to go in and square out the hole and fill and compact with hot mix,” says Todd Richins, Area Supervisor at UDOT Region Two.

New hot and cold repairs

UDOT is actively seeking longer lasting repairs, and maintenance engineers have found some promising options.

A new hot method heats the existing asphalt so it can be mixed with

A hot repair on a pothole at Echo Junction.

additional asphalt and then compacted. This hot repair method was tested on a notorious pothole on I-84 at Echo Junction in December 2009.

According to Richins, the repair is still intact. UDOT maintenance workers are putting it into use in other appropriate locations.

An easy to use patch in a bag method has also been tried on an I-15 bridge in Santaquin. The mix consists of asphalt and polymer, and it’s designed to instantly bond with the old material when poured directly on a crack or pothole. UDOT Maintenance trucks can sometimes be the method of compaction.

Winter cold mix repairs in this area on I-15 usually lasted a week or two at most, but this pour and pack repair has lasted a year without failing with workers adding more material as needed.

“It works really well, and we’re using it in a lot of places,” says Glen Wahlberg, Area Supervisor in Region Three. “We love it.”

UDOT will continue to look for longer lasting repairs that defy, for as long as possible anyway, Utah’s winter freeze-thaw weather cycles.

Want to know where the term “pothole” comes from?  Follow this link to learn more about potholes.

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Responses to “FILLING POTHOLES”

  1. I have to say that for the most part Utah’s road maintanence does an excellent job keeping the streets safe. I am glad they are looking for long lasting solutions. In this climate, the pot fixes usually don’t last more than a couple of years. Thanks again for the hard work.

    Peter Cleaver at January 18, 2011 3:10 pm
  2. keep up the great work!

    Jeremy

    Jeremy Roberts at February 3, 2011 2:53 am
  3. Keep up the good work. It is not easy to patch potholes in winter.

  4. Definetly not easy workin those potholes….my company suplies
    topsoil NJ style for the city to use and it has actually worked..

    Keep up the good work

  5. Wow, that’s quite the crater you’ve got there. That’s awesome that the pour and pack method can last so long. A whole year is pretty good under those rough conditions.

  6. Really, you road maintenance does an excellent job. I would say I am impressed by the quantity of information on this website. There are a lot of good resources here. Thanks for sharing.

  7. Well…I think that you finally topped our pot holes here in the big apple…what a crater…nice job…stay well..

    Christian Counseling NYC

  8. Great Post. It is good that you keep us informed. Thanks for the great job you do in trying to keep the streets safe.

  9. For the most part Utah’s road maintanence does an great job keeping the streets safe. They are looking for long lasting solutions. Somes at bao ve
    Thanks for the hard work

  10. I was just tweeting about the quality of the Local roads in London, the other day!!

    Very informative post!!
    No doubt some ammunition to see why these holes are re appearing a month or so after being filled.

    Best
    Adam

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