ACI Adhesive Anchor Installer Certification Practice Exam

What technique is commonly used to remove drill dust from the hole according to most MPII cleaning instructions?

1. Blow and suck technique

2. Blow-brush-blow

3. Drill and clean technique

4. Brush and scrub method

The correct answer is: Blow-brush-blow

The blow-brush-blow technique is widely recommended for cleaning drilled holes in order to ensure optimal performance of adhesive anchors. This method involves a systematic approach where air is first blown into the hole to dislodge and remove any loose drill dust and debris. Following this, a brush is used to scrub the walls of the hole, which helps to remove any adhered particles or contaminants. Finally, air is blown into the hole once again to clear out any remaining debris that may have been loosened by the brushing action. This three-step process is particularly effective because it utilizes both air and a mechanical action to ensure the hole is thoroughly cleaned, which is critical for maximizing the bond between the adhesive and the substrate material. It minimizes the risk of contamination that could affect the integrity and strength of the anchor installation. The other techniques mentioned do not provide the same level of efficiency in removing debris, which is essential for optimal anchor performance.