Morning - I need to install (16) 1-1/2" diameter by 20" long anchor rods in an existing concrete slab, these anchor rods require a 12" embedment. We are utilizing HY 200-R V3 epoxy, and will be using a diamond core to make the holes due to rod diameter and existing rebar in the slab. I was wondering if 1) utilizing a core drill to make the post-installed anchor holes was acceptable, 2) what size of core would we need for a 1-1/2" diameter anchor rod, & 3) how deep should the core be for our 12" embedment.
Thank you
Hi Josh,
Core drilling with a roughening tool is an approved installation method for the HIT-HY 200 V3 adhesive with a threaded rod per the Instructions for Use document. Please note that, Hilti does not have data on the use of a 1-1/2“ diameter threaded rod with the HIT-HY 200 V3 adhesive. The largest diameter that Hilti has performed testing with the HIT-HY 200 V3 adhesive is a 1-1/4“ diameter threaded rod per ESR-4868.
Limited additional testing has been performed with the HIT-RE 500 V3 adhesive and large diameter threaded rods found in this technical bulletin here. Per Table 2 of the bulletin, a 1-1/2“ threaded rod utilizes a 1-3/4“ nominal core bit diameter.
Ultimately, all design decisions (including final anchor selection) are at the discretion of the Engineer of Record (EOR) on the project.
If you have any further questions, please reach out to hnatechnicalservices@hilti.com.
Best,
Mia