Steel reinforcing cables in concrete are protected against corrosion by injecting a carrier fluid and corrosion inhibitors into interstitial spaces between the wires of the cable at a first location along the cable and causing the fluid to pass through the interstitial spaces between the wires of the cable to a second location along the cable. The cable comprises an array of wires confined together and intimately surrounded by a covering material which is engaged with a periphery of the cable so that there are insufficient interconnected spaces between the cable and the covering material to allow passage of fluid longitudinally along the cable outside the cable itself. The method can be used with pre-stressed concrete, with post-tensioned bonded cables and with extruded un-bonded mono-strand cables.

Steel reinforcing cables in concrete are protected against corrosion by injecting a carrier fluid and corrosion inhibitors into interstitial spaces between the wires of the cable at a first location along the cable and causing the fluid to pass through the interstitial spaces between the wires of the cable to a second location along the cable. The cable comprises an array of wires confined together and intimately surrounded by a covering material which is engaged with a periphery of the cable so that there are insufficient interconnected spaces between the cable and the covering material to allow passage of fluid longitudinally along the cable outside the cable itself. The method can be used with pre-stressed concrete, with post-tensioned bonded cables and with extruded un-bonded mono-strand cables.

Provided is a concrete reinforcing composite material that is impregnated with a thermoplastic resin having excellent alkali resistance and handleability. In a concrete reinforcing composite material 10, a core material 12 is formed from a fiber bundle of reinforcing fibers. The core material 12 is covered with a coating layer 14 made of a thermoplastic resin. The core material 12 is impregnated with the thermoplastic resin. The thickness of the coating layer 14 is 84 m or more. The fiber volume content V.sub.f of the core material 12 is 60% or more.

Steel reinforcing cables in concrete are protected against corrosion by injecting a carrier fluid and corrosion inhibitors into interstitial spaces between the wires of the cable at a first location along the cable and causing the fluid to pass through the interstitial spaces between the wires of the cable to a second location along the cable. The cable comprises an array of wires confined together and intimately surrounded by a covering material which is engaged with a periphery of the cable so that there are insufficient interconnected spaces between the cable and the covering material to allow passage of fluid longitudinally along the cable outside the cable itself. The method can be used with pre-stressed concrete, with post-tensioned bonded cables and with extruded un-bonded mono-strand cables.

Steel reinforcing cables in concrete are protected against corrosion by injecting a carrier fluid and corrosion inhibitors into interstitial spaces between the wires of the cable at a first location along the cable and causing the fluid to pass through the interstitial spaces between the wires of the cable to a second location along the cable. The cable comprises an array of wires confined together and intimately surrounded by a covering material which is engaged with a periphery of the cable so that there are insufficient interconnected spaces between the cable and the covering material to allow passage of fluid longitudinally along the cable outside the cable itself. The method can be used with pre-stressed concrete, with post-tensioned bonded cables and with extruded un-bonded mono-strand cables.

A drive system or support system, in particular for elevators, is described, comprising a belt pulley having a diameter of at least 70 mm and a drive belt or support belt which is curved around the belt pulley, wherein the drive belt or support belt comprises a cover layer (1), which is arranged on the lower side of the belt facing toward the belt pulley, and at least one tension layer (2), which is arranged directly above the cover layer; the cover layer is made of a polymeric material having elastic properties, the tension layer contains at least one fiber bundle which is almost unidirectional and which runs in the longitudinal direction of the belt, wherein certain relationships apply between the thickness of the cover layer, the thickness of the tension layer, the diameter of the belt pulley (4) and the Shore A hardness of the cover layer.

A drive system or support system, in particular for elevators, is described, comprising a belt pulley having a diameter of at least 70 mm and a drive belt or support belt which is curved around the belt pulley, wherein the drive belt or support belt comprises a cover layer (1), which is arranged on the lower side of the belt facing toward the belt pulley, and at least one tension layer (2), which is arranged directly above the cover layer; the cover layer is made of a polymeric material having elastic properties, the tension layer contains at least one fiber bundle which is almost unidirectional and which runs in the longitudinal direction of the belt, wherein certain relationships apply between the thickness of the cover layer, the thickness of the tension layer, the diameter of the belt pulley (4) and the Shore A hardness of the cover layer.

Provided is a concrete reinforcing composite material that is impregnated with a thermoplastic resin having excellent alkali resistance and handleability. In a concrete reinforcing composite material 10, a core material 12 is formed from a fiber bundle of reinforcing fibers. The core material 12 is covered with a coating layer 14 made of a thermoplastic resin. The core material 12 is impregnated with the thermoplastic resin. The thickness of the coating layer 14 is 84 m or more. The fiber volume content V.sub.f of the core material 12 is 60% or more.