The non-corrosive micro rebar is an apparatus that reinforces concrete structures. The apparatus includes a central rod, a plurality of threads, and a plurality of channels. The central rod connects the plurality of threads to one another and allows the apparatus to be flexible within the concrete structure. The plurality of threads allows a concrete mixture to grip around the apparatus. The concrete mixture surrounds the apparatus by filling the plurality of channels. In order for apparatus to hold together the concrete structure, each of the plurality of threads includes a connecting rod and an anchoring bar. The plurality of threads laterally traverses along the central rod and is radially distributed about the central rod. The connecting bar is fixed to the central rod and is oriented perpendicular to the central rod. The connecting bar traverse across the connecting rod and is oriented concave with the connecting rod.

In a method for cathodically protecting and/or passivating a metal section in an ionically conductive material such as steel reinforcement in concrete or mortar, an impressed current or sacrificial anode is mounted on the metal reinforcing bar by attaching a nut member having a female thread to the metal reinforcing bar by elongate flexible wires attached to the nut member so that the nut member and wires encircle the metal reinforcing bar and rotating a threaded rod member carrying the anode body into the female thread so that a forward end of the rod member engages with a front face of the metal reinforcing bar and pulls on the nut member away from the metal reinforcing bar to tension the wrapping wires.

Reinforcement element (10) for increasing the strength of self-solidifying pasty materials which is made of bendable filaments, that comprises a central portion (12) from which at least in three directions respective arms (11) extend out and each of the arms (11) have at least two spaced filaments (13), and the arms (11) have outer ends constituted by respective loops (14) made by the bending of the filament (13) of which the associated arm (11) is made, and in each loop (14) the distance between the filaments (13) is between the twice and twenty fifth times of the size of the filament (13), and the arms (11) are arranged in such a way that in any half space separated by any plane lead through the central portion (12) at least one of the arms (11) is arranged.

A machine for manufacturing a reinforced net with hexagonal meshes including a plurality of permanently deformable wires, a reinforcing element, and a mechanism for the reciprocal coiling of first wires and second wires in twos. The mechanism has passages for the reinforcing elements, and a feed system for: the first wires, fed in from a plurality of containers mounted on board the machine and provided internally with a predetermined length of the first wires; for part of the second wires, fed in alternately with the first wires, so as to be interwoven therewith in twos in the coiling mechanism; and for the reinforcing elements, fed into the machine. For all the reinforcing elements, a wire receptacle is provided for one of the second wires, the wire receptacle being rotatable around the reinforcing element.

Disclosed is an anode assembly for the corrosion protection of metal parts embedded in concrete. An ion-conducting material is placed between the metal part that is to be protected and the anode, which ion-conducting material exhibits higher ionic conductivity than the surrounding concrete, thus directing the protective current specifically towards the metal part. A galvanic sacrificial anode may be provided, made, e.g., from zinc and its alloys or aluminum and its alloys. The purpose of the material with higher ionic conductivity than the surrounding concrete is to selectively direct the protective galvanic current towards the metal part that is to be protected. The selective enhanced corrosion protection is especially beneficial for the protection of metal parts that are highly important for the structural integrity of concrete members, such as assembly of pre- or post-tensioning of concrete members, such as anchor-heads. The ion conducting material exhibits 20%, and more preferably 50%, higher conductivity than the surrounding concrete. A suitable ion-conducting material that exhibits ion-exchange properties may comprise tecto-alumo-silicate materials. The anode may be placed in close contact to or may be embedded into the ion-conducting material as well.

Corrosion protection of steel in concrete is provided by locating an anode assembly including both a sacrificial anode and an impressed current anode in contact with the concrete and providing an impressed current from a power supply to the anode. The impressed current anode forms a perforated sleeve surrounding a rod of the sacrificial anode material with an activated ionically-conductive filler material between. The system can be used without the power supply in sacrificial mode or when the power supply is connected, the impressed current anode can be powered to provide an impressed current system and/or to recharge the sacrificial anode from sacrificial anode corrosion products.

This invention relates to fusion bonded epoxy rebar powder coating compositions of enough latency overtime, which cure in seconds upon residual heat up to 239.0 C., exhibiting low temperature flexibility to achieve crack-free rebar bending at 45 C. and a glossy finish without yellowing or discoloration. This invention further relates to rebar powder coatings compounded using suitable dihydrazide amines as the curing agent, in combination with an executive resin blend including a compatible toughening epoxy, and a synergic catalyst package to meet the intended application challenges.

A heat shrinkable tube-covered rebar basically solves a problem of corrosion of a rebar embedded in a concrete structure by covering the rebar with a heat shrinkable tube, which is a polymer material, and a thermosetting resin to prevent the rebar embedded in the concrete structure from corroding, and easily integrates a reinforcing bar with the heat shrinkable tube and perform a first anti-corrosion treatment on the reinforcing bar by applying a thermosetting resin between the reinforcing bar and the heat shrinkable tube.

A steel-fiber reinforced polymer (FRP) composite material reinforced concrete column comprises an inner steel pipe arranged in the center, wherein the inner steel pipe is internally provided with an unbonded steel strand; the outside of the inner steel pipe is provided with an outer steel pipe, concrete is poured between the inner steel pipe and the outer steel pipe, a plurality of additional small steel pipes are evenly arranged outside the outer steel pipe, and each of the additional small steel pipes is internally provided with an additional unbonded steel strand. A composite bar cage coaxial with the outer steel pipe and arranged on the outside thereof is also provided, wherein both the outer steel pipe and the composite bar cage are covered by high-ductility concrete, and at a core area, the outside of the high-ductility concrete is wrapped with an anti-spalling layer.

Methods and devices for sealing and/or gripping concrete strengthening tendons. Some embodiments provide a method of forming a seal between an encapsulated anchor and a sheath of a tendon engaging the encapsulated anchor. Other embodiments provide a splice for forming a seal around a discontinuity in the sheath of a concrete tensioning tendon. Some embodiments provide a seal assembly for forming a seal between a tubular extension and a sheath of a tendon to protect an exposed portion of the tendon contained within the tubular extension. Some embodiments also provide a method of forming a fluid tight seal between tubular extension and a sheath of a tendon, while other embodiments provide a method of gripping the sheath of a tendon with a tubular extension to prevent the sheath from moving relative to the extension.