“How the hell do you burn down an overpass or elevated highway? It’s concrete and steel. There’s not much there to burn.”
“Watch and become Wise, Grasshopper!” :-)
http://www.sciencedirect.com/science/article/pii/S1877705813012253
https://www.youtube.com/watch?v=LeiOSp9hqLI Concrete under Fire Exposure
https://www.youtube.com/watch?v=CixMjo5VtgA Concrete spalling during a fire test at Efectis Nederland
My Father once told me that he had seen fireproof buildings in Berlin totally burned out. I think one he mentioned was the Luftwaffe headquarters.