JANESVILLE
Fires in two remarkable Interstate crashes in Janesville on Monday and Tuesday were so hot that pieces of the concrete pavement cracked and crumbled.
Both crashes kept parts of Interstate 90/39 closed for many hours while the remains of semitrailer trucks and cars were removed and the damaged pavement was patched, officials said.
Tuesdayâs incident kept the northbound Interstate closed nearly 12 hours, starting at 1:40 p.m.
Sgt. Craig Morehouse of the State Patrol said Wednesday that both crashes remain under investigation. He had no word on what caused them.
In both incidents, a semitrailer truck crashed and burned.
Jim Parry, a longtime concrete engineer for the state Department of Transportation, said burning fuel and tires of a semitrailer truck can make the surface of the concrete expand so fast that the layers of concrete farther down canât keep up, and pieces of the road surface rupture.
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