Thats the main problem, limestone in our region is often cracked and loose, especially upper layers of it. Waiting for detailed geology raport. On the other hand, one project manager has shared his experience from previous project where they were used anchor bars with mortar Fisher FIS V 360S (never heard about it). He said, that they tested 12mm rod with this glue in limestone and get perfect results with it, steel rod has broken.
2 part epoxy is Hilti HIT-RE 500, but we usually use HIT-HY 150 or 200. I cant define is it the same or not?
By the way, I found nice article about anchoring threaded rods (not reinforcment bars) into natural stone (Basalt, limestone, sandstone) with HIT-RE 500. Looks like its the same work but 2 different articles, I upload both of them, probably you'll find it interesting.
It looks like we are going to use chemical anchors in limestone for one our project. I dont know about any field tests but if we will be able to do some I will provide the results here also.
PS Cant upload files, max size 0.44mb...
PPS Uploaded it to the dropbox.