ACI Adhesive Anchor Installer Certification Practice Exam

When injecting adhesive, what ensures that there is sufficient adhesive for installation?

1. Precision measurement

2. Fill the hole to one quarter

3. Fill the hole to two-thirds

4. Manual inspection of the adhesive

The correct answer is: Fill the hole to two-thirds

The correct approach to ensure sufficient adhesive during installation is to fill the hole to two-thirds. This guideline is based on the need for adequate adhesive coverage and the ability to effectively bond the anchor with the materials being joined. Filling the hole to two-thirds allows for displacement of the adhesive as the anchor is inserted, promoting an optimal bond and ensuring that there is enough adhesive to surround the anchor throughout. In contrast, other methods may not provide the same level of assurance. If you were to fill the hole to a quarter, it would clearly not provide enough adhesive to cover the anchor adequately, leading to poor bonding strength. Precision measurement alone doesn't address the volume of adhesive needed for effective installation. Manual inspection can confirm the adhesive is present but does not guarantee that there is an adequate amount to ensure proper bonding. Therefore, filling the hole to an appropriate two-thirds level is a critical step in achieving a successful adhesive anchor installation.