ACI Adhesive Anchor Installer Certification Practice Exam

When using a threaded anchor, what must be ensured regarding the threads?

1. They should be lubricated

2. They must be intact

3. They must be painted

4. They need to be longer than average

The correct answer is: They must be intact

In the context of adhesive anchor installations, ensuring that threads are intact is critical for achieving the designed performance of the anchor. Intact threads on a threaded anchor enable proper engagement with the base material and assist in distributing loads effectively. Any damage or wear to the threads can significantly compromise the anchor's ability to resist pullout and shear forces, potentially leading to failure. While lubrication can be beneficial in some applications, it is not a general requirement for threaded anchors and can sometimes interfere with the adhesive bond. Painting the threads is usually unnecessary and may even prevent adequate bonding of the adhesive to the substrate if not applied correctly. The length of the threads can vary based on design and application, but there is no universal requirement for them to be longer than average. Therefore, the integrity of the threads is paramount for the performance and reliability of the adhesive anchor system.