What is used to pin one structural element to an adjacent element?

• A. Rebar
• B. Grout
• C. Mortar
• D. Caulk

Answer: (A)

When you need to connect two structural elements so they act together, you use a mechanical pin that can transfer load across the joint. A steel bar placed through the joint—commonly referred to as rebar—acts as a dowel or pin, tying the elements together and allowing shear to be transferred from one element to the other. This provides the necessary continuity and alignment without relying on a purely bonding material. Grout and mortar bond masonry units or fill joints, but they are not used as the primary load-transfer pin between elements. Caulk seals joints and is not a structural connector. So, a rebar pin is the best choice for pinning adjacent structural elements.