Cass County Secondary Road crews spent a few hours Sunday afternoon repairing a portion of a County road near the Atlantic Airport. Pictures from the scene showed a large section of G-30/Highland Road, buckled upward, creating a steep, 6-to 8-inch incline and similar sharp drop-off on the other side. The pavement blow-up happened near the curve around the airport, or about one and a half miles west of Atlantic.

Cass County Engineer Charles Marker said pavement blow-ups, caused by “Thermal Expansion,” can happen without warning this time of year. He said “As temperatures rise, most material expands. That includes concrete. Steel and concrete and almost every material we know, gets longer as the temperature goes up. That’s thermal expansion. In concrete, as we saw in the concrete road…where normal saw joints have worn or cracks appear…and there isn’t enough room in those to expand, and it has no where to go except out of alignment, which means ‘up.’”

Photos courtesy Jessica Tye Shroyer

That type of expansion can create something more than just a “speed bump.” Marker says a motorist either saw the situation unfold or came upon the ramped-up portion of pavement, and flagged down other motorists so they wouldn’t hit the obstruction. That same person also notified the County. Marker said he was notified about the road problem at around 3-p.m. Crews were quickly dispatched to remove the damaged section of concrete and replace it temporarily with rock filler.

He said they tear out the old sections and replace it with gravel or crushed limestone. The road will remain that way until this fall, when the temperatures cool enough to allow the concrete to be replaced. Marker says the road was installed sometime around the year 2000, and has seen no problems since then, until Sunday.