ACI Adhesive Anchor Installer Certification Practice Exam

What initial material should be discarded from a new cartridge according to the MPII?

1. Initial bead

2. Initial filler

3. Dedication bead

4. Initial adhesive

The correct answer is: Dedication bead

The correct answer pertains to the concept of a "dedication bead," which refers to the initial material that is extruded from a new cartridge of adhesive. When you begin to use a new adhesive cartridge, it is crucial to ensure that the product is mixed correctly and is homogenous before application. The dedication bead, which is the first bit of adhesive that comes out, often contains the component that has not been properly mixed or may have settled during storage. This bead can affect the performance of the adhesive if used, since it may not exhibit the full properties required for the bonding process. Thus, it is standard practice to discard this initial material to ensure the adhesive applied later is effective and reliable. Proper adherence to this step ensures that the integrity of the installation is maintained and that the curing and bonding properties of the adhesive are optimized. This is vital in adhesive anchoring applications, where performance is critical to the overall success of the installation.