There are three typical concrete mounting methods: non-shrink grout, epoxy with all-thread, and expansion anchors. Non-shrink grout is used in applications where the concrete is cored out and the posts are set into the cored holes. This is a preferred method for applications like mounting onto curbs, retaining walls, or any area where cracking out the concrete due to limited mounting space is an issue, or where mounting plates may interfere with the walking surface. For regular plate-mounted applications, epoxy or expansion anchors are used. Epoxy is used with all-thread, and is also typically used where cracking the concrete from expansion anchors is a concern. However, this method is time-consuming and typically requires a special inspection during the anchoring process. The simplest and most cost-effective method is expansion anchors, though this method is dependent on the amount of edge clearance allowable by an engineer.
If any of the three mounting methods are used properly, there isn’t any reason to expect bolts to pull out of concrete. That said, if you’re dealing with a situation where anchors have already been used, and there is still a concern about pull-out, epoxy can be used to strengthen the anchors you’ve used.
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