ACI Adhesive Anchor Installer cheat sheet

Hole cleaning is the dominant field variable: use the manufacturer's specified brush diameter and the specified number of blow-brush-blow cycles; skipping steps can reduce capacity by half or more.

Adhesive anchor capacity depends on bond area, so effective embedment depth (hef) is measured from the concrete surface to the bottom of the adhesive column, not to the anchor tip.

Drill hole diameter must match the anchor system's published tolerance; percussion or rotary-hammer drilling creates a rougher, dustier hole than diamond coring, and some systems require different cleaning for each.

Gel time and cure time scale with concrete temperature: below about 40 F (4 C) most two-part adhesives cure very slowly or not at all, and above roughly 100 F (38 C) gel time shortens dramatically.

Adhesive must be fully cured before torque is applied; tightening a partially cured anchor shears the bond and voids the installation.

Hole depth plus debris clearance matters: drill deeper than hef to allow for dust accumulation, then verify embedment with a marked rod or the anchor's depth indicator.

Anchor spacing and edge distance below the published critical values reduce capacity; minimum spacing is typically expressed in multiples of hef and minimum edge distance in absolute inches.

Two-part cartridge systems require discarding the first portion of extruded adhesive until both components show uniform color and consistent mix.

Concrete strength at installation governs design: adhesive anchors are qualified for uncracked concrete by default, and cracked-concrete qualification requires specific testing and reduced capacities.

Anchor capacity in tension is limited by the weakest of steel strength, concrete breakout, bond strength, or concrete splitting; the governing mode changes with embedment depth and edge distance.

Overhead and horizontal (soffit/wall) installations require a system rated for those orientations; adhesive must be formulated to resist flow-out before cure.

Hole cleaning in water-saturated or submerged holes requires a manufacturer-approved method; standard blow-brush cleaning is not equivalent to water-filled hole procedures.

In seismic or wind-governed applications, verify the anchor is qualified for seismic loading and that the design accounts for crack cycling and tension/compression reversals.

When drilling near existing reinforcement, use a rebar locator; cutting rebar or drilling through post-tensioning strands can compromise structural integrity and is often prohibited.

For fire-resistance-rated assemblies, anchor capacity must be evaluated at elevated temperature; some adhesives lose significant strength above their glass transition temperature.

Inspection and proof loading: field quality control may include torque verification or proof load testing per the project specification, and records of installation parameters should be retained.