Chemical Anchoring

Chemical anchoring systems are used within the building and construction industry for a wide range of applications. These resin-based systems can be used to fix a variety of components and fixtures directly to a substrate.

Main Applications

• Structural connections transferring high loads into slim columns
• Fixing sanitary-ware to hollow masonry
• Holding down bolts for steel columns
• Tying back existing masonry facades to new steel structures
• Dynamic applications: holding down machinery
• Fixing starter-bars for reinforcements
• Wall-tie replacements
• 

Procedure

• Drilling of Holes into Concrete
• When directed, use a jig or fixture to ensure the holes are positioned and aligned correctly during the drilling process.  Upon approval, adjusting hole locations to avoid reinforcing steel is permitted.
• Drill the holes with a pneumatic drill unless another drilling method is approved.  Follow the manufacturer’s recommendations regarding the diameter of the drilled hole.
• Immediately after completion of drilling, blow all dust and debris out of the holes with oil-free compressed air using a wand extending to the bottom of the hole.  Remove all dust from the sides of the holes by brushing the holes with a stiff-bristled brush of a sufficient size and then blow the hole free of dust.  Repeat this procedure until the hole is completely clean.  Check each hole with a depth gauge to ensure proper embedment depth.
• Repair spalled or otherwise damaged concrete using approved methods.

Inspection of Holes

• Inspect each hole immediately prior to placing the adhesive and the anchor bolts/dowels.  Ensure all holes are dry and free of dust, dirt, oil, and grease.  Rework any hole that does not meet the requirements of this Special Provision.
• Mixing of Adhesive, Mix the adhesive in strict conformance with the manufacturer’s instructions.
• Embedment of Anchor Bolt/Dowel
• Clean each anchor bolt/dowel so that it is free of all rust, grease, oil, and other contaminants.
• Insert the anchor bolt/dowel the specified depth into the hole and slightly agitate it to ensure wetting and complete encapsulation.  After insertion of the anchor bolt/dowel, strike off any excessive adhesive flush with the concrete face.  Should the adhesive fail to fill the hole, add additional adhesive to the hole to allow a flush strike-off.
• Do not disturb the anchor bolts/dowels while adhesive is hardening.

Field Testing / Pull Test

Final acceptance of the adhesively anchored system is based on the conformance of the pull test to the requirements.