Which best describes a mechanical connection in which molten metal or 'metallic grout' interlocks the grooves inside the connection sleeve with the deformations on the bar?

• A. Metal Filled Sleeves
• B. Hot Forged Steel Sleeve
• C. Threaded Steel Coupling
• D. Cold Forged Steel Sleeve

Answer: (A)

This question tests understanding of a mechanical splice that uses molten metal to create a lock between the bar’s surface deformations and the inside of the sleeve. The best description is metal filled sleeves. In this method, the bar with grooves is inserted into a sleeve and molten metal or metallic grout is poured in. As it hardens, the molten metal flows into those grooves and around the bar’s deformations, forming a rigid interlock. The shear and tensile capacity come from this interlock plus the solid bond between the metal and the sleeve, giving a strong, reliable splice.

Other options describe different joining approaches that don’t rely on filling the sleeve with molten metal to lock into the bar’s deformations, such as forging-based sleeves or threaded couplings, which use deformation, threads, or mechanical engagement rather than a molten-metal interlock.