Yes concrete is "flammable" in the context of fluorine (most things are though). Chlorine trifuoride is extremely notorious for that. Silicon dioxide can be oxi

Yes concrete is "flammable" in the context of fluorine (most things are though). Chlorine trifuoride is extremely notorious for that. Silicon dioxide can be oxidized by fluorine (which is a stronger oxidizing agent than oxygen, so...) P.S. This is a fun video to watch https://www.youtube.com/watch?v=ckSoDW2-wrc https://www.youtube.com/watch?v=ckSoDW2-wrc for "exciting" chemicals.