Coil rod or threaded rod

[JStructsteel]

Got some architectural precast that I need to fasten together/hold down to a precast column. My thoughts are threaded rods into a insert into the top of the column. tighten it all up, then grout. My question is, is regular threaded rod or a coil rod better? Im leaning coil rod since its more forgiving on the threads.

My alternate is a dowel bar with a threaded end into the insert, and then a sleeve it can all be grouted around.

Thoughts on the better connection?

I will work on the details and try to get posted

 

[BR0]

I worked at a precast company 25 years ago doing design, so this probably is outdated info. However, we used coil rods a lot for final connections. The thread issue with concrete clogging up the embeds in typical threaded rods is real. Having said that, coil rod didn't (at that time) have the ASTM standards that threaded rod, nuts etc had. I know some engineers didn't use coil rods for that reason.