ACI Adhesive Anchor Installer Certification Practice Exam

Which equipment uses a static mixing element?

1. Drilling rig

2. Mixing nozzle

3. Anchor bolt

4. Injection pump

The correct answer is: Mixing nozzle

The equipment that utilizes a static mixing element is specifically the mixing nozzle. This type of nozzle is designed to combine two or more components of an adhesive or sealant as they exit the nozzle, allowing for a homogeneous mixture before it is applied to the substrate. The static mixing element inside the nozzle consists of a series of interlocking or coiled channels that facilitate thorough mixing without the need for mechanical agitation. In adhesive anchoring applications, achieving the proper mixture of the components is crucial for ensuring the strength and durability of the bond. A poorly mixed adhesive can lead to weak anchor installations and potential failures. The mixing nozzle ensures accuracy and consistency in the material being applied, which significantly impacts the effectiveness of the adhesive anchor system. The other equipment listed serves different functions within the adhesive anchoring process and does not utilize a static mixing element. For instance, a drilling rig is used for drilling holes in substrates, an anchor bolt refers to the fastening element itself, and an injection pump is responsible for dispensing the adhesive, but it does not mix the components as they are dispensed.