ABSTRACT

Post-installed bonded anchors, which have been developed recently, are used extensively in practice. An adhesive or bonded anchor is simply a reinforcement bar or a threaded rod inserted into a predrilled hole in hardened concrete, whose diameter is slightly greater than the diameter of the anchor. Typically the drill hole diameter is only 10 to 25 percentage larger than the diameter of the anchor rod. The gap between the drill hole surface and the anchor surface is filled with an adhesive as a bonding agent between the concrete and the steel after setting and hardening. The anchors transfer the loads to concrete through mechanical interlock, fric tion, chemical bond or combination thereof. The anchorages facilitate for attachment of structural systems. Anchorage system must be designed to ensure durability and robustness, and should also have sufficient load carrying capacity and deformability. Fastening techniques are used for joining old concrete-to-old concrete or old concrete-to-new concrete.