An insulated concrete panel , said panel comprising: an insulation layer having one or more openings extending therethrough; a first concrete layer adjacent to a first surface of said insulation layer; a second concrete layer adjacent to a second surface of said insulation layer; and a shear connecter received within one of said one or more of said openings in said insulation layer, characterized in that said shear connector comprises - an elongated core member comprising a first end and a second end, wherein said core member is substantially hollow presenting an inner chamber , wherein said core member includes a threaded portion on an exterior surface of said core member; a flanged end-piece threadedly secured to one of said first end or said second end of said core member; wherein at least a portion of said flanged end-piece includes a maximum diameter that is larger than a maximum diameter of said core member, wherein the first concrete layer is at least partially within the inner chamber of said core member, and optionally an insulating material is at least partially within the inner chamber of said core member, wherein said flanged end-piece is embedded within said first concrete layer, wherein said shear connector is configured to transfer shear forces between the first concrete layer and the second concrete layer and to prevent delamination of the first concrete layer and the second concrete layer. an insulation layer having one or more openings extending therethrough; a first concrete layer adjacent to a first surface of said insulation layer; a second concrete layer adjacent to a second surface of said insulation layer; and a shear connecter received within one of said one or more of said openings in said insulation layer, characterized in that said shear connector comprises - an elongated core member comprising a first end and a second end, wherein said core member is substantially hollow presenting an inner chamber , wherein said core member includes a threaded portion on an exterior surface of said core member; a flanged end-piece threadedly secured to one of said first end or said second end of said core member; wherein at least a portion of said flanged end-piece includes a maximum diameter that is larger than a maximum diameter of said core member, an elongated core member comprising a first end and a second end, wherein said core member is substantially hollow presenting an inner chamber , wherein said core member includes a threaded portion on an exterior surface of said core member; a flanged end-piece threadedly secured to one of said first end or said second end of said core member; wherein at least a portion of said flanged end-piece includes a maximum diameter that is larger than a maximum diameter of said core member, wherein the first concrete layer is at least partially within the inner chamber of said core member, and optionally an insulating material is at least partially within the inner chamber of said core member, wherein said flanged end-piece is embedded within said first concrete layer, wherein said shear connector is configured to transfer shear forces between the first concrete layer and the second concrete layer and to prevent delamination of the first concrete layer and the second concrete layer. <EOS>