rawlbolt

I have access to only one side of a concrete gravel board. There is very limited access to the other side (i.e. barely finger reach). Can expanding bolts be used without cracking the concrete? Would a toggle fixing be an option for outdoors? If so, what fixing products might I consider for a...

Looking for some advice, I was tightening a Rawlbolt into concrete block wall and the bolt snapped in two. Any suggestions for how I can get the rest of the rawlbolt out so I can try again with a new one? Annoyingly this was the last of three and no issues with the other two so don’t really want...