Abstract
The authors describe the effects of hole preparation method, grout type, hole diameter, bar size, embedment length, cover, bar surface condition, orientation of the installed bar, and concrete strength on the bond strength of grouted reinforcing bars. Hole preparation method, using a high-speed vacuum drill or a hand-held electric hammer drill, and cleaning methods, using a fiber bottle brush with water, a fiber bottle brush without water, or compressed air only are compared. Two capsule systems, two two-component grout systems, and two nonshrink grout systems are evaluated. Bar installations include vertical, sloped, and horizontal bars. Test results are used to develop rational design and construction requirements. The bond strength of grouted reinforcing bars is not highly sensitive to differences in the hole preparation or cleaning methods studied. Grouts that provide strong bond at the grout-concrete interface provide higher bond strengths than grouts that undergo failure at the grout-concrete interface. With the exception of bars anchored by capsule systems, the bond strength provided by grouts is not sensitive to hole diameter. Bond strength increases with increasing embedment length, cover, and bar size. The bond strength of grouted reinforcement is insensitive to the presence of epoxy coating. Vertically and horizontally anchored bars may display different bond strengths, depending on the grout used.
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