In concrete construction, what does the term "deformed wire" refer to?

The term "deformed wire" in concrete construction specifically refers to wire that has ridges or projections on its surface. These deformations are crucial for enhancing the bond between the wire and the surrounding concrete, which ultimately contributes to the structural integrity and strength of the concrete elements. The projections increase the surface area of the wire, allowing for better adhesion and distribution of load, thereby minimizing the risk of slippage and increasing the overall durability of the concrete.

In contrast, the other options do not accurately capture the essence of "deformed wire." Twisted wire may provide some mechanical strength but does not have the specific bonding characteristics that deformed wire possesses. Smooth wire lacks the necessary surface features for optimal bonding with concrete, and wire used for decorative purposes does not serve the structural functions needed in construction applications.