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RE: Expoxy type grout for anchor bolt

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Consider a non-shrink cementitious grout.  If the anchor bolts are loaded in shear only, the cementitious grout should be very effective.  For pullout, I don’t know of design values, but with a well prepared hole [not smooth, but with irregularities for mechanical-interlock, and well-wetted – saturated, surface-dry is a common description] before grout placement, a cementitious grout may provide good pullout resistance.  The grout can be placed as a drypack compacted with a pipe around the bolt.  


But the drypack should not be too dry, since non-shrink cement has a high demand for moisture to cure properly.  A too-dry grout placed, or grout placed into a dry hole may result in the material at the contact surface having low very strength.


Nels Roselund, SE

South San Gabriel, CA


From: Rich Lewis [mailto:seaint03(--nospam--at)]
Sent: Tuesday, August 23, 2005 11:55 AM
To: seaint(--nospam--at)
Subject: Expoxy type grout for anchor bolt


Is there a product for grouting anchor bolts in large holes?    Typically, from what I’ve seen, most epoxy anchor holes are slightly bigger than the bolt diameter. 


I have a project where the anchor bolts were not installed correctly.  The contractor wants to core 2-3” diameter holes for installing new bolts.  I was wondering if there was a product that would bond to the bolts and a hole that big.  The anchor diameters are ¾” & 1”.