The method according to the invention for producing a prestressed concrete workpiece is characterized in that the prestress is created by a heat treatment, wherein the concrete and the reinforcement therefor are selected in such a way that, when cooling the concrete workpiece from an elevated temperature, the heat expansion coefficient of the concrete is less than that of the reinforcement, and in that, during cooling, the concrete and the reinforcement adhere sufficiently strongly to one another if, during cooling, the concrete is hydrated at least to such an extent in order to be able to expand the reinforcement on account of the different heat expansion coefficients, and in that the concrete, together with the reinforcement, is brought to the elevated temperature in such a way that and is hydrated during cooling at least to such an extent that it is prestressed by the reinforcement after cooling.

Post-tensioning wrap with pre-packed fiber tapes in resin is wrapped under tension around a concrete article. Post-tensioning wrap comprising a plurality of fiber tapes each comprising a plurality of tendons separated by a resin. The post-tensioning wrap is then cured or partially cured so that the post-tensioning wrap forms a single, unitary material around the cylinder that is substantially impermeable.

A tension member with at least one loop made from fiber-reinforced plastic, which tension member has a plurality of fibers that run substantially parallel to each other, so that the loop is formed by the plurality of fibers, wherein a first group of fibers is turned over along the loop in a first turning direction, while a second group of fibers is turned over along the loop in a second turning direction, which is opposed to the first turning direction. Some of the turned-over fibers of both groups end in a different distance from the vertex of the loop than others of the turned-over fibers, so that a cross-section of the tension member that results from the respective number of fibers that run approximately parallel to each other outside the turning-over area of the fibers approximately continuously decreases until it reaches the cross-section size of the tension member.

An improved shaped composite rebar is disclosed.

Fiber-reinforced coated mats and fiber-reinforced coated mat-faced panels are provided herein, along with methods for making the same. Fiber-reinforced coated mats include a mat with a fiber-reinforced coating on one surface. Fiber-reinforced coated mat-faced panels include a fiber-coated mat and a panel material in contact with a surface of the mat opposite the fiber-reinforced coating. Methods include applying a fiber-reinforced coating to a surface of a mat to form a coated mat and drying the coated mat to cure the fiber-reinforced coating. Some methods also include combining the mat with a panel material to form a mat-faced panel.

A resin impregnating device (1) is used in a method for producing a reinforcing bar and has a chamber for holding a liquid thermoplastic resin. A plurality of guide plates (4A-4C) is arranged in the chamber along a traveling direction of a plurality of strands of reinforcing fiber material (Fb). Through holes (41) in two of the guide plates (4A, 4C) guide or spread the strands of the reinforcing fiber material Fb away from each other, and a single through hole (42) in an intermediate one of the guide plates (4B) guides or converges all the strands of the reinforcing fiber material (Fb) towards each other.

A fiber cement material formulation comprising a cementitious binder, a siliceous material, fiber, alumina trihydrate and a bifunctional low density additive wherein the bifunctional low density additive comprises any one or more of diatomaceous earth, recycled autoclave fiber cement dust or cellulose dust. The fiber cement material formulation optionally further comprises a secondary low density additive which may be perlite. In some embodiments, a fiber cement article manufactured from the fiber cement material formulation comprises a density of approximately 1.1 g/cm.sup.3 or below.

The present invention concerns a reinforcing element for producing concrete components, a concrete component and corresponding production methods. The reinforcing element comprises a plurality of fibers and a plurality of holding elements which are connected to each other by the fibers so that the fibers can be stressed in their longitudinal direction by means of the holding elements. The fibers are fixed to the holding elements such that the fibers in the stressed state enter the holding elements in a substantially linear manner. This enables both a high degree of pretension and an efficient, reliable and thus cost-effective production of the concrete components.

A method for producing a three-dimensional construction material component preferably having at least one curved surface. A plurality of spacers are arranged in a formwork. A textile reinforcement is supported on the spacers, such that the textile reinforcement has a defined position within a formwork interior of the formwork. A tensile force is applied via a tensioning device to the textile reinforcement in at least one tension direction. Construction material is introduced into the formwork interior and surrounds the textile reinforcement. The construction material is then hardened, wherein the tensile force is maintained during the hardening. During this process, the spacers are integrated into the construction material component. The tensioning device has at least one clamping unit for clamping an end portion of the textile reinforcement between two clamping surfaces. The clamping surfaces are provided on clamping insert bodies, which are of a plastic material of a defined hardness.

PROBLEM TO BE SOLVED: To provide a concrete structure and a concrete slab, which, by using a continuous fiber-reinforced polymer material as a main reinforcing material or a tendon, and by mixing a short fiber reinforcing material in concrete, compensate for the mechanical shortcomings of the continuous fiber-reinforced polymer material, not rusting, and taking advantage of superior characteristics of the continuous fiber-reinforced polymer material, with low manufacturing cost and ultra-high durability.

MEANS TO SOLVE THE PROBLEM: In a concrete structure, in which a continuous fiber-reinforced polymer material is arranged as a main reinforcing material or a tendon, a short fiber reinforcing material consisting of an organic fiber is mixed in 0.5% or more with respect to an entire volume, the continuous fiber-reinforced polymer material is shaped like a rod or a stranded wire, a ratio Lf/Gm between a fiber length Lf of the organic fiber of the short fiber reinforcing material and a maximum aggregate diameter Gm of a concrete composition is 1.2 to 3.7, and an aspect ratio Lf/De when an equivalent diameter De, which is a cross-sectional area of the organic fiber converted into a circle diameter, is 30 to 69.