AAI Substrate Preparation & Surface Conditions Flashcards
6 cards from real AAI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 AAI Substrate Preparation & Surface Conditions flashcards as text
What effect does drilling into concrete with a reinforcing bar embedded directly in the drill path have on anchor performance?
Answer: It compromises both the anchor installation and the structural integrity of the reinforcing bar
Drilling through rebar cuts the reinforcing bar, reduces its load-carrying capacity, and creates an irregular hole that undermines proper adhesive anchor installation.
Which type of concrete substrate may require a lower design bond strength value for adhesive anchors?
Answer: Concrete with high moisture content or standing water
Wet or saturated concrete can dilute the adhesive during installation, leading to lower in-place bond strength than values derived from tests in dry conditions.
What is the purpose of a post-installation inspection of the drilled hole before injecting adhesive?
Answer: To confirm depth, diameter, cleanliness, and dryness meet specifications
Confirming all hole parameters before injection is the last opportunity to correct deficiencies that would otherwise result in a non-conforming installation.
For substrate temperatures below the adhesive manufacturer's minimum installation temperature, what corrective action is acceptable?
Answer: Warm the substrate to the required temperature range before and during installation
Heating the substrate (with heat blankets, heat guns, etc.) before and during installation ensures the adhesive reaches the minimum temperature required to initiate and sustain the cure reaction.
How does the presence of form-release agent or oil contamination on the borehole wall affect adhesive anchors?
Answer: It prevents adhesive from bonding to the concrete, drastically reducing capacity
Chemical contaminants like form-release agents act as bond breakers between adhesive and concrete, leading to cohesive failure at greatly reduced loads.
When anchor holes are drilled but installation is delayed, what protection must be provided?
Answer: Cover or plug the holes to prevent debris re-contamination until installation
Open holes can collect dust, water, or debris that negates prior cleaning, requiring the entire cleaning procedure to be repeated before injection.