Pavement expands and contracts during extreme hot and cold spells. This allows water to get under the pavement and leads to potholes.
The City of Columbia Street Division is now using an Asphalt Recycler to make a hot mix for repairing potholes on city streets throughout the year. A Hotbox trailer is then used to transport the hot mix to the street while keeping it a steamy 350 degrees all day.
“Filling pot holes is an important part of our mission to maintain city streets,” Public Works Crew Supervisor Matt McCracken said. “These two machines make the pothole patching process more effective. The hot mix is more durable than the cold mix asphalt.”
Cold mix patching is still used when needed but hot mix can be used any time of year as long as the street is relatively dry and free of snow. Hot mix patching reduces the cost of pothole repair by up to 40 percent.
Report a Pothole
Pothole Patching Process
Here’s how the pothole repair process works.
1 A loader pours crushed asphalt into the Asphalt Recycler, which
heats and churns it to create the “hot mix.”
2 The loader takes the hotmix from the recycler …
3 … and dumps it into a mobile Hotbox that keeps the asphalt
at 350 degrees throughout the pothole patching process.
(The hot box has a heating element that runs on propane.)
4 Crews pull the Hotbox throughout the city, patching potholes
with steaming hot mix as they go. Once a pothole has been spotted or reported, it’s the goal of Public Works to repair it as soon as possible (preferably within 24 hours), weather and resources permitting.
“How Potholes Form“ – USA Today