A rebar splicing device developed originally to connect precast concrete members is now being used for cast-in-place construction as well. A metal splice sleeve is filled with grout that provides a mechanical bond between rebar deformations and grooves on the inside of the sleeve.
When a pre-grouting method is used, grout is poured into the metal sleeve and the precast member is lowered into place. Members must be braced for at least 24 hours after grouting. This procedure is used primarily for erecting precast columns.
When a post-grouting method is used, the member is lowered into place and immediately braced. Grouting is done later with a hand-operated grout pump. This method makes more efficient use of crane time and is preferred over pre-grouting for most applications such as connecting shear walls or connecting structural elements to foundations.