By Bob Filipczak
Gust Scharffbillig, Arden Hills transportation operation supervisor for maintenance, has worked for Mn/DOT for 25 years. Photo by Kent Barnard |
At the Arden Hills Truck Station, things are heating up for pothole season.
“I would say it’s going to be a long season because of the amount of snow we got, which is going to prolong the freeze/thaw cycle and increase moisture,” said Gust Scharffbillig, Arden Hills transportation operation supervisor for maintenance.
Scharffbillig started at Mn/DOT in 1986 as a maintenance worker in Eden Prairie. He now supervises between 12 and 100 workers—depending on the season. His team works on paving, shoulder maintenance, milling and traffic control. Newsline recently caught up with Scharffbillig during his current game of “Whack-a-Hole” on Twin Cities Metro area highways and interstates.
What do people need to understand about potholes?
What they don’t understand about potholes, this time of year, is our inability to get hot mix asphalt to do a permanent patch. Everything we do right now is what’s known as cold mix, which is a temporary patch. It’s a soft, pliable material we use in the wintertime. It holds, but it will come out eventually. We don’t use hot mix in the wintertime because it costs too much to heat it up to 300 degrees, and it would cool off too fast.
Most of the commercial asphalt plants will be opening mid- to late April. There is one plant that opens around the beginning of March that we can get a limited amount of hot mix from. Even with hot mix, it is tough to get it to bond this time of year because of the moisture and the ground temperatures. When we put it in the hole, it never really gets a chance to bond because the ground is still frozen. It will last longer, but it’s still not a permanent patch like we do in the summertime.
How many potholes can you fill in one day?
That’s tough to gauge. Potholes will vary based on the condition of the road. A new road is going to have less; an old road will have a lot more. As you get more, you can patch more per day because you have less drive time between patches.
How do you keep your crews safe?
We spend a lot of time and money on traffic control to keep our crews safe. A lot more of our work is done at night, especially in the metro, so we don’t impede traffic. We do try to stay off the roads as much as possible during rush hour, but if we have a hole that pops a tire or bends a rim, we have to get out there and take care of it.
From left, Larry Degner, District 8 maintenance, shows Nathan Pederson, graduate engineer, how to use an air patcher to clean and fill potholes. Mn/DOT file photo |
So is night safer than daytime work?
There are two ways to look at it. While more traffic causes its own issues, more traffic during the day can be safer because we back them up and slow them down. At night, there’s less traffic, but when we get hit it’s at a higher speed. It’s a double-edged sword.
We do patch both day and night. We have four full-time night crews out at the shop. The night crew concentrates primarily on the inner core, inside the I-494/I-694 loop, where traffic volumes are high. During the day, we concentrate more outside the loop.
I heard something about an air patcher.
We’ve had good success with that. It’s a slower process, but it lasts a lot longer. It uses hot oil and rock. We try to target our biggest problem potholes with that patcher—the ones on the interstate where there’s a lot of truck traffic. We own one automated patcher and have a contract to use another one.
It’s a much better patch. What we lose in time, we make up for in durability.
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