The invention relates to a geopolymer grout for protecting prestressing reinforcements, the geopolymer grout comprising metakaolin, fly ash and an activator mixture, the activator mixture comprising sodium hydroxide and sodium silicate, wherein the molar ratio Na.sub.2O:SiO.sub.2 of the sodium silicate is between 0.40 and 0.70.

The invention relates to a geopolymer grout for protecting prestressing reinforcements, the geopolymer grout comprising metakaolin, fly ash and an activator mixture, the activator mixture comprising sodium hydroxide and sodium silicate, wherein the molar ratio Na.sub.2O:SiO.sub.2 of the sodium silicate is between 0.40 and 0.70.

A table shear may include a clamp and a shearing mechanism, the shearing mechanism supported by the clamp. The shearing mechanism may include a fixed lower shear blade, a lower shear blade backup plate supporting the fixed lower shear blade, a moveable upper shear blade and a shear compression cylinder. The shear compression cylinder abuts the movable upper shear blade.

A structure, in particular, a wind turbine tower (1), which is pre-tensioned with at least one tensioning element (3), has a foundation (2), a concrete tower section (4), in particular, consisting of a plurality of precast concrete elements (5), as well as a head piece (6), wherein the tensioning element (3) at least at one of its ends has a tendon anchor (7, 7a, 7b). The tendon anchor (7, 7a, 7b) has an accommodation (8) in which a first end (10a) of an anchor rod (9) is fastened, in particular screwed in. A second end (10b) of the anchor rod (9) is anchored to the foundation (2) or to the head piece (6). In a corresponding method for manufacturing a structure, a first end (10a) of an anchor rod (9) is fastened, in particular screwed in an accommodation (8) of a tendon anchor (7, 7a, 7b), and a second end (10b) of the anchor rod (9) is anchored to the foundation (2) or to the head piece (6).

A rebar tying tool includes: a feed mechanism (24), which includes a first brushless motor (32) and performs an advancing process that advances a wire (W) and a draw-back process that draws back the wire (W); a first inverter circuit (212), which is electrically connected to the first brushless motor; and a control unit (202), which controls the first brushless motor via the first inverter circuit. The first brushless motor comprises a first Hall-effect sensor (180), which is disposed on a first sensor board (178). In the advancing process, the control unit performs lead-angle control on the first brushless motor at a first lead angle. In the draw-back process, the control unit performs lead-angle control on the first brushless motor at a second lead angle. The first lead angle is set to be larger than the second lead angle.

A rebar binding machine comprises a curl guide that causes a wire to curl, a torsion part including a torsion shaft for twisting the curled wire, and a pair of grips that can be grasped by an operator. The grips are provided to the two axial sides of the torsion shaft as viewed from the operator side when the operator grasps the grips to perform an operation, and it is possible to change the height of the grips in the axial direction of the torsion shaft.

A rebar binding machine comprises a curl guide that causes a wire to curl, a torsion part including a torsion shaft for twisting the curled wire, and a pair of grips that can be grasped by an operator. The grips are provided to the two axial sides of the torsion shaft as viewed from the operator side when the operator grasps the grips to perform an operation, and it is possible to change the height of the grips in the axial direction of the torsion shaft.

A binding structure for attaching two structures to each other, said binding structure comprising an elongated body portion having a first end portion and a second end portion. A head portion is provided in the first end portion and in the second end portion, wherein said head portion protrudes radially from (at least a portion of) the body portion.

Described herein is an arrangement (1) for guiding a wire in a wire binding machine (3), wherein the arrangement (1) comprises a guide member (5) and a first spring (7) arranged to act with a first spring force against the guide member (5), wherein the guide member (5) is arranged to bear against the wire and act against the wire with said first spring force in order to guide the wire during a wire binding process when the wire moves relative to the guide member (5). The guide member (5) is arranged so that a movement of the guide member (5) substantially away from the wire is allowed in order to reduce friction forces between the guide member (5) and the wire during the wire binding process, so that locking of the wire against the guide member (5) is prevented. Also described herein is a wire binding machine (3) comprising an arrangement (1).

A wire locking mechanism (200, 300, 400, 500, 600, 700) for a reinforcement bar, rebar, wire tying device (100), the locking mechanism comprising (200, 300, 400, 500, 600, 700) a holding member (210, 310) and a counter-holding member (220, 320) arranged to engage respective and opposite sides of a wire (230) to releasably hold the wire (230) in a locking position, where a holding force exerted on the wire (230) by the holding member (210, 310) is normal to a holding plane (A2), wherein the holding member (210, 310) is supported on a first end of an excentre arm (240, 340), the excentre arm (240, 340) being rotatably supported on a first shaft (250, 350) to rotate (R1) about an excentre arm center of rotation (255, 355), wherein the holding member (210, 310) is arranged distanced (D) along a first axis (A1) from the excentre arm center of rotation (255, 355), the first axis (A1) forming an acute angle (A) with the holding plane (A2) when in the locking position.