ACI Adhesive Anchor Installer Certification Practice Exam

How full should a hole be filled with adhesive during installation?

1. Half full

2. Three-quarters full

3. Completely full

4. Two-thirds full

The correct answer is: Two-thirds full

For adhesive anchor installation, it is important that the hole is filled adequately to ensure proper bond between the adhesive and the surrounding substrate. The correct approach is to fill the hole completely with adhesive; however, the key is to achieve an optimal fill level that allows for the insertion of the anchor without excessive adhesive overflow, which can compromise the installation. In this context, filling the hole to the designated level allows for the proper establishment of the bond while providing space for the anchor itself. A completely filled hole ensures that every part of the anchor that will bond to the adhesive is immersed in adhesive, promoting maximum load transfer and structural integrity. Therefore, filling it appropriately, such as to a level that would avoid air gaps or voids, is crucial for achieving the desired strength and performance of the anchor. To summarize, while the choice of two-thirds full might seem adequate at a glance, completely filling the hole ensures that the adhesive encapsulates the anchor entirely and facilitates optimal load distribution and performance. Therefore, the ideal answer highlights the necessity of filling the hole adequately to allow for a robust and reliable anchoring system.