[Buug959]

We had our first cold night last night, about -2c. This morning I went out and noticed a small piece of the curb had broken away. There's no evidence that it was struck by anything and it was beside my Golf so nothing could get there anyway. Upon closer inspection what I first thought was rebar turned out to be a small, rotten stick that was buried in the concrete. I wouldn't have thought that -2c (28f) would be cold enough to freeze that stick hard enough to break concrete but I can't think of any other explanation. Thoughts anyone?