About 3 years ago I made a cement cast of a rhubarb leaf to use as a bird bath. It came out well, I painted it to look like a caladium leaf, and I was pleased with it. Last week, however, my dog ran across it in pursuit of a squirrel... she stepped on the pointier end and flipped it into the air. When it came down the back of one side broke off in several pieces. Do any of you know of something I could use to try to repair it? The only thing I can think of is silicone, but I have no idea if it would stick the cement together. Is there any kind of glue that would work?