ACI Adhesive Anchor Installer Certification Practice Exam

When checking if a brush is the right size for hole cleaning, what indicates a proper fit?

1. It is loose in the hole

2. It resists insertion

3. It easily fits into the hole

4. It leaves a mark on the wall

The correct answer is: It resists insertion

A proper fit for a brush used in hole cleaning is indicated by its resistance to insertion. This resistance signifies that the brush has the right diameter and bristle density to effectively engage with the sides of the hole, ensuring that it can thoroughly clean any debris or dust within. The brush should compress slightly as it is being inserted, allowing for optimal contact with the hole's walls. This ensures that the cleaning is thorough, as the brush must adequately reach all surfaces to prepare the hole for adhesive anchor installation. When the brush easily fits into the hole, it may not provide enough friction against the walls, leading to inadequate cleaning. Similarly, if the brush is loose in the hole, it may fail to effectively remove contaminants, undermining the performance of the adhesive anchor. Leaving a mark on the wall does not necessarily indicate a good cleaning fit but rather suggests that the brush is either too large or too abrasive for the application, which could also cause issues during installation.