How far away were you shooting from? I couldnt see any carbon arrow surviving a hit from a concrete wall. I watched a hunt on Primos Truth about Hunting and one guy hit a limb on the way down and his arrow blew into a bunch of pieces. I personally shoot Goldtips and I've hit some branches but never had an arrow break. Rocks on the other hand will shatter them in a second. My point is that goldtips are extremely durable and I don't think they could survive a concrete wall.