A stud weldable rebar includes a steel bar comprised of a material composition confirming to ASTM 706 which extends along an axis A from a first end to a second end. The steel bar includes a base portion disposed adjacent the first end which has a base diameter D1 to define a base cross-sectional area of the base portion. The steel bar also includes an upset portion disposed adjacent the second end which has an upset diameter D2 being greater than said base diameter D1 to define an upset cross-sectional area of said upset portion. The material composition of the steel bar is restricted to a carbon equivalency between 0.31 and 0.43, and the upset cross-sectional area is approximately 13.5% to 22.5% greater than the base cross-sectional area to provide A706 rebar that surprisingly meets both the AWS D1.1 and ACI 318 standards after stud welding.

A shearwall assembly includes a first concrete and a second concrete column and a protrusion extending from a connection end of the respective concrete columns. Each protrusion has two side surfaces and a center surface. A pair of horizontal slab panels are positioned between the respective connecting ends of the first and second concrete columns and abutting the two side surfaces of the respective protrusions. A horizontal reinforcement extends from the center surface of the respective protrusions and between the respective trusses. Concrete is poured at a volume formed between the pair of horizontal slab panels and the first and second concrete columns.

A forming system includes a frame and two forming walls. The two forming walls are positioned at a distance from each other to define a first vertical wall course. One forming wall is supported by the frame such that the one forming wall can be translated toward or away from the respective other forming wall. The frame can be raised to raise the two forming walls to be positioned to pour a second vertical course on top of the first vertical course. The translation of the one forming wall allows for the pouring of the first vertical course with horizontally extending rebar that extends through the one forming wall outside of the first vertical wall course, to tie in to a subsequently poured floor slab. The translation permits the vertical raising of the one forming wall, without striking the extending rebar, to pour the second vertical course on the first vertical course. A worker's platform is provided that is supported by the frame and vertically movable by raising the frame. The worker's platform is located below the one forming wall on a side of the one forming wall opposite the respective other forming wall and is rollable or pivotal to also clear the extending rebar during raising of the frame.

A wind turbine tower that may be assembled fast, including a nacelle and a rotor, the tower comprising at least two stackable annular sections made of concrete connected through a main connecting arrangement adapted to withstand loads induced by the wind turbine rotor, and an auxiliary connector.

A reinforcement steel bar includes a shaft part and a head part formed by forging an end portion of the shaft part. The head part is provided with a projection projecting from the shaft part in a radial direction of the shaft part, and a recess formed along a corner portion between an outer peripheral surface of the shaft part and the projection.

A reinforcement steel bar includes a shaft part and a head part formed by forging an end portion of the shaft part. The head part is provided with a projection projecting from the shaft part in a radial direction of the shaft part, and a recess formed along a corner portion between an outer peripheral surface of the shaft part and the projection.

A reinforcement steel bar includes a shaft part and a head part formed by forging an end portion of the shaft part. The head part is provided with a projection projecting from the shaft part in a radial direction of the shaft part, and a flat surface extending parallel to an axial direction of the shaft part. A distance from a shaft center of the shaft part to the flat surface is in a range from 100% to 115% of a maximum radius of the shaft part.

A rebar set-up bar used to construct a rebar grid that provides reinforcement for a concrete wall or structure. The set-up bar is vertically positioned in the grid and includes a metal or steel rod having a plurality of supports. The supports are attached to the elongated rod at intervals and are adapted to receive horizontal rebars therein.

A rebar set-up bar used to construct a rebar grid that provides reinforcement for a concrete wall or structure. The set-up bar is vertically positioned in the grid and includes a metal or steel rod having a plurality of supports. The supports are attached to the elongated rod at intervals and are adapted to receive horizontal rebars therein.

A device for insulating the slab foundation of a building, said device comprising: a generally horizontal insulating section disposed between the slab foundation and a footer of a building, said horizontally disposed insulating section comprising a generally elongated cuboid shape having at least one cutout through which a concrete column is disposed; said prefabricated device further comprising a generally vertical insulating section disposed adjacent to said horizontal insulating section and attached to said building.