Chemical bonding

Chemical plugs are composite anchor cartridges which have the following advantages over mechanical plugs and dowels:

• Adaptation to uneven drill holes
• High break resistance due to elasticity
• Simple handling at building site
• Corrosion inhibiting effect

Chemical plugs are available for use in concrete applications, hollow block and aerated concrete constructions. They are used, for example, in the construction of tunnels to attach signs, lighting fixtures, or ventilators.

One- and two-component systems are commercially available for different applications. A standard one-component system consists of a glass cartridge containing a special synthetic resin, fillers, thixotropic agents, and a second smaller glass cylinder containing the hardener. In order to anchor steel pins used in the construction of bridges, the glass cartridge is placed into the drill hole inside a screen case, and is then broken open with a drill or hammer. The steel pin is fixed directly into the reaction resin which is now beginning to cure. Improved bonding strength is achieved between the concrete, the adhesive, and the steel rod. Due to its elasticity, the system is less likely to crack than classical plugs, especially as a result of expansion within the concrete.