Composite rebar reinforced with woven mesh and cord, respective production method and uses thereof

Abstract

The present description relates to a reinforced composite material rebar for reinforcing concrete elements, comprising: a core comprising fibres selected from glass fibres, basalt fibres, carbon fibres or combinations thereof; a woven mesh covering the core of the rebar; a thermosetting polymer matrix selected from polyester, epoxy or vinyl-ester, or mixtures thereof; and at least one cord wound helically around the woven mesh; wherein the woven mesh is impregnated with the polymer matrix, and wherein the woven mesh is selected from polyester, biofibre or mixtures thereof. The invention also relates to a concrete structure and to the method of obtaining same.

Description

DESCRIPTION Composite rod reinforced with Woven Mesh and Cord, its method of production and uses TECHNICAL DOMAIN

[0001] This description relates to a composite rod reinforced with a woven mesh and a strand (helical structure) for incorporation into concrete parts or structures. This description also relates to the method for producing the corresponding composite rod. BACKGROUND

[0002] In civil construction, reinforced concrete structures have been found to be subject to aggressive agents that reduce their mechanical strength. This reduction in mechanical strength compromises the performance and durability of these structures.

[0003] Corrosion, one of the main problems in concrete structures, compromises the performance of reinforced concrete elements, causing them to reach their serviceability limit state.

[0004] One of the existing alternatives to overcome these identified problems is the use of composite materials.

[0005] The use of textile materials in composite materials for the construction industry has generated significant interest. The use of fibers and yarns to reinforce the polymer matrix promotes optimization of the developed product.

[0006] Patent document W02008041204 describes a composite bar reinforced by a braided textile structure with axial reinforcement, based on the concept of multifunctional structures, where different types of fibers are used in different parts of the bar, according to mechanical and physical requirements. These bars allow a rational distribution of the various types of fibers used, optimizing their use, ensuring the required performance of the bar and contributing to the reduction of the costs associated with the production of steel rods or bars. Patent document W02008041204, in its triaxial braiding production technique, integrates a vat into the braiding machine that allows the impregnation of axial reinforcement fibers in a polymer matrix, immediately before the braiding process. The production process occurs in a single step, and the impregnation of the axially reinforced braided structure occurs from the inside out.

[0007] Now a solution is presented that is corrosion resistant; has higher tensile strength than construction steel; weighs less than steel rebar; is easy to transport and install; does not interfere with magnetic fields and / or radio frequencies; is electrically non-conductive; thermally non-conductive; has a higher melting point than steel and can allow monitoring and evaluation of the condition of buildings.

[0008] These facts are described in order to illustrate the technical problem solved by the achievements of this document. GENERAL DESCRIPTION

[0009] This description relates to a composite bar reinforced with a woven mesh interwoven with helical reinforcement. Specifically, it concerns a composite bar axially reinforced with textile structures, intended for incorporation into concrete parts or structures. The bar has superior reinforcing properties, providing greater strength and durability to concrete structures.

[0010] This description relates to a composite rod reinforced with a woven mesh and a strand (helical structure) for incorporation into concrete parts or structures. This description also relates to the method for producing the corresponding composite rod.

[0011] The composite rod comprises a polymer matrix and continuous fibers, presenting several advantages in relation to steel rods, such as: greater specific resistance, greater resistance to corrosion and fatigue, lower coefficient of thermal expansion, greater ease of transportation and installation and less impact. environmental. It should be added that the composite rod has high durability and resistance and is lightweight.

[0012] In one embodiment, the woven mesh comprises openings ranging in size from 0.1 mm to 5 mm, preferably 0.5-3 mm; more preferably 1-2 mm.

[0013] Within the scope of the present disclosure, the openings of the woven mesh (size / hole size of the openings in the woven mesh), also called "knit draft pattern", represent the intersection between warp and weft yarns in order to obtain a textile structure with a substantially quadrangular mesh-like design.

[0014] The present description relates to a reinforced composite material rod for reinforcing concrete elements comprising: a core comprising fibers selected from glass fibers, basalt fibers, carbon fibers or combinations thereof; a woven mesh covering the core of the rod; a thermosetting polymeric matrix selected from polyester, epoxy or vinyl ester, or mixtures thereof; at least one cord helically wound around the woven mesh; in which the polymeric matrix is ​​impregnated in the woven mesh; in which the woven mesh is made of polyester and / or biofiber (such as: cotton, silk, sisal, hemp; textile fibers derived from bamboo, soy, or mixtures thereof, among others).

[0015] The present description relates to a reinforced composite material rod for reinforcing concrete elements comprising: a core comprising fibers selected from glass fibers, basalt fibers, carbon fibers or combinations thereof; a woven mesh covering the core of the rod; a thermosetting polymeric matrix selected from: polyester, epoxy or vinyl ester, or mixtures thereof; at least one cord helically wound around the woven mesh; in which the polymeric matrix is ​​impregnated in the woven mesh; wherein the woven mesh is selected from polyester and / or biofiber; wherein the linear mass of the cord ranges from 5000-25000 DTex; wherein the cord has a degree of twist between 5 - 50 turns / m; wherein the woven mesh is a ribbed interlaced structure; wherein the woven mesh comprises a plurality of textile fibers comprising 5 to 200 filaments; wherein the textile fiber of the woven mesh comprises a total linear mass ranging from 100 DTex to 2000 DTex. The composite rebar described herein exhibits high strength, elasticity, and durability, as well as excellent adhesion to concrete, providing an improved response of the cement in conjunction with the rebar. Surprisingly, the combination of rebar characteristics results in a synergistic effect, significantly improving the strength, elasticity, and durability of the concrete as a whole.

[0016] Preferably, the woven mesh is made of polyester.

[0017] In one embodiment, the cord has a degree of twist between 5 and 50 turns / m.

[0018] In one embodiment, the woven mesh comprises weft yarns and warp yarns, wherein only a portion of the weft / warp yarns pass over the cord so as to consolidate the cord to the rod.

[0019] In one embodiment, the rod comprises two strands, wherein the first strand and the second strand are arranged in opposite directions, and which intersect at predetermined points.

[0020] In one embodiment, the cord comprises a plurality of filaments, preferably monofilaments.

[0021] In one embodiment, the basis weight of each monofilament of the plurality of monofilaments ranges from 800 DTex to 2000 DTex (80 Tex to 200 Tex), preferably 1000 - 1500 DTex (100 - 150 Tex), more preferably 1100 - 1300 DTex (120 - 130 Tex).

[0022] In one embodiment, the linear mass of the cord ranges from 5000-25000 DTex (500-2500 Tex), preferably 8000-20000 DTex (800-2000 Tex), more preferably 8000-15000 DTex (1000-1500 Tex).

[0023] In one embodiment, the distance between the turns of the cord ranges from 5-50mm, preferably from 15-35mm.

[0024] In one embodiment, the polymer matrix is ​​selected from epoxy, polyester, or vinyl ester.

[0025] In one embodiment, the amount of the polymer matrix is ​​10 to 70% (w / w); preferably 20 to 60% (w / w), more preferably 25 to 40% (w / w), most preferably 25 to 35% (w / w).

[0026] In one embodiment, the grammage of the polymer matrix is ​​10 to 70% (w / cm 2 rod); preferably 20 to 60% (w / cm 2 rod), more preferably 25 to 40% (w / cm 2 rod), more preferably 25 to 35% (w / cm 2 man).

[0027] In one embodiment, the woven mesh is a ribbed interwoven structure.

[0028] In one embodiment, the woven mesh comprises a plurality of textile fibers comprising from 5 to 200 filaments, preferably 10 to 190, more preferably 16 to 180 filaments.

[0029] In one embodiment, the textile fiber of the woven mesh comprises a total linear mass ranging from 100 DTex to 2000 DTex, preferably 500 to 1500 DTex, more preferably 800 to 1200 DTex.

[0030] In one embodiment, each textile fiber of the woven mesh has a specific gravity of 2 to 8 (g / cm 3 ).

[0031] In one embodiment, the number of strands of the cord ranges from 8 to 35 multifilaments, preferably 13 multifilaments with 2 to 6 strands each.

[0032] In one embodiment, the opening size of the woven mesh ranges from 0.1-5 mm; preferably 0.5-3 mm; more preferably 1-2 mm.

[0033] This description also concerns concrete structures comprising the rebar described.

[0034] The present description also relates to a method of obtaining the described composite rebar, which comprises the following steps: arranging a plurality of fibers selected from glass fibers, basalt fibers, carbon fibers, or combinations thereof in a fiber feeder to create the core of the rod; arranging a plurality of fibers to create the woven mesh; impregnating the plurality of fibers of the core and the plurality of fibers of the woven mesh in the thermosetting polymer matrix; braiding the plurality of fibers of the woven mesh with a braider and simultaneously winding at least one strand in a helical manner around the woven mesh; curing with thermal activation.

[0035] In one embodiment, the polymer matrix is ​​at a temperature of 10 to 50 °C. BRIEF DESCRIPTION OF THE FIGURES

[0036] For easier understanding, the figures are attached, which represent preferred embodiments that are not intended to limit the scope of this description.

[0037] Figure 1: Schematic representation of a composite rod implementation.

[0038] Figure 2: Schematic representation of a composite rod implementation.

[0039] Figure 3: Schematic representation of an embodiment of the composite rod comprising two strands wound in a helical manner around the woven mesh.

[0040] Figure 4: Schematic representation of a composite rod embodiment where the core 1 comprising the reinforcing fibers and the woven mesh 2 corresponding to the braided coating fibers are visible.

[0041] Figure 5: Schematic representation of an implementation of the method for obtaining the composite rod.

[0042] Figure 6: Schematic representation of an implementation of the method for obtaining the composite rod.

[0043] Figure 7: Schematic representation of the adhesion area of ​​a braided rod. DETAILED DESCRIPTION

[0044] The present description relates to a reinforced composite rod comprising a core of reinforcing fibers, axially coated with a woven mesh, at least one cord arranged helically on the woven mesh and a polymeric matrix.

[0045] This paper describes an innovative composite rebar axially reinforced with textile structures, which significantly improves the strength and durability of concrete parts and structures. The solution is unique due to the woven mesh structure combined with the cord wrapped around the mesh.

[0046] The present description relates to a reinforced composite material rod for reinforcing concrete elements comprising: a core comprising fibers selected from glass fibers, basalt fibers, carbon fibers or combinations thereof; a woven mesh covering the core of the post; a thermosetting polymeric matrix selected from: polyester, epoxy or vinyl ester, or mixtures thereof; at least one cord helically wound around the woven mesh; in which the polymeric matrix is ​​impregnated in the woven mesh; in which the woven mesh is selected from polyester and / or biofiber; where the linear mass of the cord ranges from 5000-25000 DTex; in which the cord has a degree of twist between 5 - 50 turns / m; in which the woven mesh is a ribbed interlaced structure; in which the woven mesh comprises a plurality of textile fibers comprising from 5 to 200 filaments; wherein the textile fiber of the woven mesh comprises a total linear mass ranging from 100 DTex to 2000 DTex.

[0047] In one embodiment, at least one cord is helically wrapped around the woven mesh.

[0048] In one embodiment, the cord is arranged helically and axially along the woven mesh.

[0049] In one embodiment, the diameter of the reinforcing fiber core ranges from 1 to 60 mm, preferably from 2 to 50 mm, more preferably from 2.5 mm to 40 mm.

[0050] In one embodiment, the core comprises fibers selected from glass fibers, carbon fibers, basalt fibers, or aramid fibers, or mixtures thereof. Preferably, the core is made of glass fibers.

[0051] In one embodiment, each core fiber has a diameter of 0.1 to 1 pm, preferably 0.2 to 0.4 pm, more preferably 0.27 to 0.35 pm.

[0052] In one embodiment, the rod comprises 10 to 50% (w / w) polymer matrix, preferably between 20 to 35% (w / w).

[0053] In one embodiment, the polymer matrix can be selected from epoxy, bio-epoxy, polyester, or vinyl ester. Preferably, the polymer matrix is ​​epoxy or vinyl ester. The advantage of these materials is their strong bonding, durability, versatility, and chemical and mechanical resistance.

[0054] In one embodiment, the interwoven woven mesh allows for a homogenization of the rod shape and a surface roughness that will allow for excellent adhesion to the concrete.

[0055] In one embodiment, the interlacing may have different geometries, namely different braid angles or threads in its composition.

[0056] In one embodiment, the interlace comprises a plurality of fibers distributed in a symmetrical manner, which forms the interlace with half of the fibers having an angle and the other half having a symmetrical angle.

[0057] In one embodiment, the rod comprises a woven mesh with fibers intertwined at two symmetrical angles, and the rod further comprises a helical structure distributed axially along the rod. The woven mesh provides surface roughness to the rebar.

[0058] In one embodiment, the interlacing may occur in a single layer or with a plurality of layers superimposed on each other in order to reinforce the rod.

[0059] In one embodiment, the woven mesh is interwoven and is composed of fibers to axially reinforce the rod and roughen the surface.

[0060] In one embodiment, the textile fibers of the interwoven fabric are selected from bio-fibers, polymeric fibers, polyester, or blends thereof.

[0061] In one embodiment, the textile fiber of the interwoven mesh is polyester.

[0062] In one embodiment, the textile fiber of the woven mesh comprises from 5 to 200 filaments, preferably 10 to 190, more preferably 16 to 180 filaments.

[0063] In one embodiment, the textile fiber of the woven mesh has a total linear mass between 100 Dtex to 2000 Dtex.

[0064] In one embodiment, the textile fiber has a mass percentage of 2 to 8% (w / w).

[0065] In one embodiment, the strand is made of polyester, or one of the other yarn variants described. The helical form refers to a helical or spiral twist structure. The term helical implies that the strand, preferably a yarn, is twisted in the woven mesh in a helix or spiral pattern, which gives better results to the post. This twist structure affects the strength, elasticity, and appearance of the rebar. This reinforcement allows the rebar to be stronger and to adhere better to the concrete.

[0066] In one embodiment, the cord has a twist pitch ranging from 5 mm to 50 mm. In one embodiment, the cord has a twist rate between 5 and 50 turns / m.

[0067] Helical amplitude affects the properties of the pole, including its strength and appearance.

[0068] In one embodiment, the rod comprises a single spiral strand. Preferably, the winding angle is 30° to 70° relative to the axial direction of the core, preferably 35° to 60°.

[0069] In one embodiment, the rod comprises two helical strands arranged in opposite directions and intersecting at predetermined points. In particular, the first strand is spirally wound around the core in one direction, and the second strand is spirally wound around the core in an opposite direction, such that the first and second strands intersect at certain points. Preferably, a first strand is clockwise, and the second strand is clockwise. has a counterclockwise direction. In one embodiment, the rod comprises a simple spiral and a simple counter-spiral, that is, two spirals crossed between each other.

[0070] In one embodiment, the cord comprises a plurality of monofilaments or multifilaments.

[0071] In one embodiment, and for best results, part of the helically arranged cord is over the ribbed woven fabric, and part of the cord is under the ribbed woven fabric. More specifically, the ribbed woven fabric is over the cord at a spacing of 5 mm to 50 mm, preferably 10 mm to 35 mm.

[0072] In one embodiment, at certain points of the cord they are arranged under the ribbed interwoven textile mesh.

[0073] This combination of the cord being over or under the woven mesh results from the need for mechanical fixation of the cord and as a guarantee of stability, structural and application repeatability.

[0074] This description also relates to a method for producing composite rods, comprising the following steps: arranging a core of glass fibers, basalt fibers, carbon fibers, or mixtures thereof in a longitudinal alignment in a continuous flow; arranging a plurality of fibers to create the woven mesh covering the core; completely immersing the core fibers, the woven mesh fibers, and the helical structure cord in the polymer matrix, then removing any excess; initiating the pre-curing process with thermal activation; braiding the woven mesh fibers to cover the core, creating a ribbed interlaced mesh; simultaneously winding the cord in a helical fashion around the woven mesh; initiating the final curing process by thermal activation; after curing, performing the cut-to-size process.

[0075] In one embodiment, the application of the polymer matrix is ​​at a temperature of 10 to 50°C, preferably 20 to 40°C. More preferably, the impregnation of the polymer matrix occurs at a temperature of 30 to 35°C.

[0076] In one embodiment, obtaining the rod involves braiding being carried out by electrical equipment that allows the simultaneous rotation of several coils of high-tenacity wire and that ensures the coating of the pultruded composite.

[0077] In one embodiment, the braiding process uses 40 spools of polyester yarn, worn in the head of the equipment. This braiding allows the outer surface of the cylindrical rod to be properly roughened and ensures that it significantly improves its adhesion to the concrete after wrapping and curing.

[0078] The braiding technique has a low production cost and allows the fibers to be oriented multiaxially in the plane, thus creating a ribbed structure that guarantees the protection and geometry of the core.

[0079] In one embodiment, the method comprises interlacing one or two systems of yarns in helical directions and simultaneously continuously drawing at a constant speed the braiding of these yarns.

[0080] In one embodiment, the method comprises the following steps: feeding the fibers to obtain the core; impregnating the fibers with the thermosetting matrix and forwarding them to the braiding zone; braiding the impregnated fibers to form the woven mesh and winding at least one cord in a helical manner around the woven mesh; forwarding them to a curing chamber.

[0081] The impregnation of the fibers in the thermosetting polymer matrix occurs before braiding, and after this process the composite is cured.

[0082] The impregnation of the cord also occurs at the time of impregnation of the fibers.

[0083] In one implementation, the last step is cutting the rod.

[0084] In the fiber feeding step, the fibers are unwound from the spools and guided to the fiber alignment plate, where there is a fiber dispersion module, then they go to a set of rollers designed to develop and maintain them under adequate tension.

[0085] During fiber braiding, the excess resin present in the core fibers is finally removed due to the compression force of the polyester fiber, ensuring that the required amount of resin is incorporated into the rods produced. The braid configuration present in the rods can be controlled by adjusting the rotation speed of the braiding system.

[0086] In one embodiment, the curing chamber is set at a preselected temperature to ensure the resin cures during the rod's residence time. Excessive temperatures should be avoided to prevent resin degradation. The chamber temperature must, however, be sufficient to ensure the rod acquires a solid consistency so that upon exiting the oven it can be pulled in a controlled manner without problems or damage caused by the pulling system.

[0087] In one embodiment, the curing chamber temperature is 185°C.

[0088] Table 1 shows the experimental mechanical properties of Example 1, a rod with type "X", in which the rod comprises a core composed of a plurality of E-glass fiber rovings, TEX 9600, with a diameter of 6 mm, and a high-tenacity polyester coating with DTex 1100 / 192 / 1, TPM 5-50 S Twist. The mesh angle is approximately 49°, the same angle being the same for the helical cord. For the coating, 39 spools of said polyester were used, plus one spool filled with the cord that creates the rib. Preferably, the cord material is high-tenacity polyester DTex 1100 / 192 / 1, TPM 5-50 S Twist, and for the rib effect, the cord was previously braided with 8 strands.

[0089] The rods used are 750 mm long, with 250 mm of each end anchored to the steel tubes for the tensile test, leaving 250 mm of free length between the ties.

[0090] Table 1 - Characterization of the X type rod and experimental mechanical properties of the composite rod of the present invention.

[0091] The tests were performed in accordance with the American Concrete Institute regulation ACI 440.3R-04: B.2 - "Guide Test Methods for Fiber-Reinforced Polymers (FRPs) for Reinforcing or Strengthening Concrete Structures". For this, the inside of the pipes must be completely cleaned before the rod is inserted inside.

[0092] The following Table presents a comparison of a composite bar realization compared to a steel bar. Table 4 - Comparison table between an implementation of the present description and a steel rod.

[0093] Tests performed according to the American Concrete Institute regulation ACI 440.3R -04: B.2 - "Guide Test Methods for Fiber-Reinforced Polymers (FRPs) for Reinforcing or Strengthening Concrete Structures.

[0094] Below is a table showing example 2, which demonstrates the maximum stress obtained for a reference rod, a rod subjected to an alkaline environment and a rod subjected to a chloride test.

[0095] The alkaline test environment was prepared in accordance with Procedure A, described in ASTM D7705 / 7705M-12 - Standard Test Method for Alkali Resistance of Fiber Reinforced Polymer (FRP) Matrix Composite Bars Used in Concrete Construction, which provides standardized requirements for determining the resistance of FRP bars to alkaline environments under laboratory conditions. The document suggests a chemical composition such that the solution represents the pore water within Portland cement mortar concrete. Thus, the solution was prepared in 10 liters of distilled water, in a container measuring 85 x 45 x 15 cm, following the compounds specified in the standard, namely: 1,185.0 g of Ca(OH)2, 9 g of NaOH, and 42 g of KOH. The cycle periods were 30, 60, and 80 days.

[0096] To create the chloride environment, containers containing an aqueous solution of saltwater were used, in which the test specimens were submerged. The saline solution was prepared according to ASTM D 1141-98 - Standard Practice for the Preparation of Substitute Ocean Water, which specifies the chemical compounds to be associated to obtain an adequate representation of seawater. For preparation, the standard specifies that two compounds should be added to 9 liters of water: sodium chloride (245.34 g) and anhydrous sodium sulfate; and two solutions containing MgCl2.6H2O (111.12 g), anhydrous CaCl2 (11.58 g), and SrCl2.6H2O (0.42 g) in solution 1; and KCl (6.95 g), NaHCO3 (2.01 g), KBr (1.0 g), H3BO3 (0.27 g) and NaF (0.03 g) in solution 2. The cycle periods were 30, 60 and 80 days

[0097] Several rebars were also tested: a reference "Y" type rebar that was subjected to an alkaline environment and an environment with chlorides.

[0098] In one embodiment, the Y-type rod comprises: a core diameter of 4 mm, wherein the core comprises 75% (w / w) E-glass fiber rovings and 25% (w / w) 12K carbon fibers; the mesh comprises a high-tenacity polyester coating with DTex 1100 / 192 / 1, TPM 5-50 S Twist; the mesh angle is approximately 49°, which is the same angle for the helical cord. Thirty-nine coils of said polyester plus one coil were used for the coating. filled with the cord that creates the rib. The cord material is high-tenacity polyester DTex 1100 / 192 / 1, TPM 5-50 S Twist, and for the rib effect, it was previously braided with 8 threads. The polymer matrix used was Biresin CR144 epoxy resin, approximately 30% (w / w).

[0099] The tested rods are 750 mm long, with 250 mm at each end anchored to the steel tubes for the tensile test, leaving 250 mm of free length between ties.

[0100] Strain can be measured by strain gauges or strain sensors.

[0101] Table 2 - Description of the maximum stresses found per sample, with "Y" type bars.

[0102] Tests performed according to the American Concrete Institute regulation ACI 440.3R -04: B.2 - "Guide Test Methods for Fiber-Reinforced Polymers (FRPs) for Reinforcing or Strengthening Concrete Structures.

[0103] There is a more pronounced reduction in the maximum tension of the rods subjected to the alkaline solution. Table 3 - Description of the maximum moduli of elasticity found per sample

[0104] Tests performed according to the American Concrete Institute regulation ACI 440.3R -04: B.2 - "Guide Test Methods for Fiber-Reinforced Polymers (FRPs) for Reinforcing or Strengthening Concrete Structures.

[0105] It can be seen that the rebars have good resistance to attack in basic environments since the elasticity modules of the elements maintained constant values, close to the reference values.

[0106] A "Z" type rod was also tested. In one embodiment, the "Z" type rod comprises: a 4 mm core diameter, with the core being carbon fiber; the mesh comprises a high-tenacity polyester coating with DTex 1100 / 192 / 1, TPM 5-50 S Twist; the mesh angle is approximately 45°, which is the same angle for the helical strand. The polymer matrix used was polyester, approximately 30% (w / w).

[0107] In one embodiment, adhesion tests were carried out on the composite rod type "Z", in which the said mesh comprises 16 spools of polyester threads.

[0108] This material was chosen because, in addition to its homogeneity and uniformity, it also offers suitable properties in terms of flexibility and wear resistance. Twelve roughness patterns were selected, corresponding to varying weave angles, drawing speed, diameter, and roughness. Samples without roughness were also produced by varying only the drawing speed to serve as a control sample. Three speed patterns were considered: (1) a minimum speed (vmin) (0.54 m / min); (2) maximum speed (vmax) (1.07 m / min); and (3) a speed considered intermediate between the presented speeds (vint) (0.8 m / min). For each speed pattern, four roughness patterns composed of different patterns were considered.Simple braiding roughnesses were performed with 8 and 16 strands, with these multifilament strands placed in one (le) or two (2e) positions of the braid, producing one (le) or two (2e) strand helicoids, respectively.

[0109] Table 5 - Characterization of the samples tested according to the present invention, namely, rod with "Z" typology with one cord (le) or two cords (2e).

[0110] From the pullout tests carried out on the composite rebars, embedded in two different mortar typologies (RHP Plus and AREM Ciarga), carried out according to the conditions presented in Table 5 and in accordance with the EN 1015-11 (1999) standard, it was concluded that the sample "levmax_8" was the one that presented the greatest force required for its pullout in the two mortars tested. Therefore, this type of rib cord is the one that presents the best results, being produced with only one coil that forms a helicoid around the woven mesh, the cord being a twisted cord with 8 polyester threads DTex 1100 / 192 / 1, TPM 5-50 S Twist.

[0111] In one embodiment, the woven meshes produce a redistribution of forces and the formation of multiple cracks, resulting from the fibers being composed of several filaments that do not break instantly. The presence of polyester ensures high levels of deformation at load levels between 50 and 90% of the maximum load after the rupture of the resistant fibers due to its elastic capacity. The roughness of the rebars also promotes better adhesion, high levels of deformation given that its spatial distribution is a helical shape, which when subjected to axial loads elongates to high levels of deformation.

[0112] In one embodiment, Figures 1 and 2 represent the composite rod wherein 1 corresponds to the reinforcing fiber core, 2 corresponds to the woven mesh, and 3 corresponds to the cord that is arranged in a helical manner.

[0113] In one embodiment, Figure 3 represents an embodiment of the composite post in which 3 corresponds to two strands. In this figure, the predetermined point for the two strands to intersect is visible.

[0114] In one embodiment, Figure 4 depicts the composite rod in which 1 corresponds to the reinforcing fiber core and 2 is the woven mesh.

[0115] In one embodiment, Figure 5 represents a method of obtaining the composite summer, in which 7 corresponds to the braiding machine, 8 to the curing chamber, 11 corresponds to the fiber feeding, 12 to the fiber impregnation, 13 to the braiding, 14 to the curing, 15 to the drawing, 16 are the core reinforcement fibers, 17 is the fiber alignment plate, 18 is the resin bath, 19 is the fiber orientation plate, 20 are the braiding spools, 21 corresponds to the braiding yarns and 22 is the motor.

[0116] In one embodiment, Figure 6 represents a method of obtaining the composite rod in which 4 is the feeder for placing the fibers, 5 is the impregnation chamber where the fibers are impregnated, 6 is where fluidization and pre-curing occur, 7 is the braider where the braiding of the fibers for the woven mesh occurs, preferably a braiding machine, 8 is the curing chamber; 9 is the puller where the pulling and cutting occur and 10 is the output station.

[0117] In one embodiment, Figure 7 represents the adhesion area of ​​a braided rod. According to Figure 7, the distance X between ribs represents the contact length between the braided structure formed with eight strands that will be responsible for the spacing between the filaments, and the letter Y represents the height of that same structure (roughness). These properties always depend on the structural characteristics of the braid, such as braid angle, core diameter and number of wires used to design the roughness.

[0118] The term "comprises" or "comprising" when used in this document is intended to indicate the presence of the features, elements, integers, steps and components mentioned, but does not preclude the presence or addition of one or more other features, elements, integers, steps and components, or groups thereof.

[0119] The present invention is, of course, in no way restricted to the embodiments described in this document and a person with average knowledge of the area will be able to foresee many possibilities for modifying it and replacing technical characteristics with equivalent ones, depending on the requirements of each situation, as defined in the attached claims.

[0120] The following claims define additional embodiments of the present description.

Claims

CLAIMS 1. Reinforced composite rod for reinforcing concrete elements comprising: a core comprising fibers selected from glass fibers, basalt fibers, carbon fibers or combinations thereof; a woven mesh covering the core of the post; a thermosetting polymeric matrix selected from: polyester, epoxy or vinyl ester, or mixtures thereof; at least one cord helically wound around the woven mesh; in which the polymeric matrix is ​​impregnated in the woven mesh; in which the woven mesh is selected from polyester and / or biofiber; where the linear mass of the cord ranges from 5000-25000 DTex; in which the cord has a degree of twist between 5 - 50 turns / m; in which the woven mesh is a ribbed interlaced structure; in which the woven mesh comprises a plurality of textile fibers comprising from 5 to 200 filaments; wherein the textile fiber of the woven mesh comprises a total linear mass ranging from 100 DTex to 2000 DTex.

2. Rod according to the previous claim in which the woven mesh is made of polyester.

3. Rod according to any one of the preceding claims wherein the woven mesh comprises a plurality of textile fibers comprising 10 to 190 filaments, more preferably 16 to 180 filaments.

4. Rod according to any one of the preceding claims wherein the cord is made of polyester.

5. Rod according to any one of the preceding claims, wherein the cord has a degree of twist between 10 and 40 turns / m.

6. The pole according to any one of the preceding claims wherein the woven mesh comprises weft yarns and warp yarns, wherein only a portion of the weft / warp yarns pass over the cord so as to consolidate the cord to the pole.

7. The rod of any one of the preceding claims, wherein the cord comprises a plurality of monofilaments.

8. Rod according to the previous claim, wherein the grammage of each monofilament of the plurality of monofilaments of the cord ranges from 800 DTex to 2000 DTex, preferably 1000 - 1500 DTex, preferably 1100 - 1300 DTex.

9. Rod according to any one of the preceding claims, wherein the linear mass of the strand ranges from 8000-20000 DTex, preferably 8000 - 15000 DTex.

10. Rod according to any one of the preceding claims, wherein the distance between the turns of the cord ranges from 5-50 mm, preferably from 15-35 mm.

11. A rod according to any one of the preceding claims, wherein the rod comprises two strands, wherein the first strand and the second strand are arranged in opposite directions, and which intersect at predetermined points.

12. Rod according to any one of the preceding claims wherein the amount of the polymeric matrix is ​​10 to 70% (w / w); preferably 20 to 60% (w / w), more preferably 25 to 40% (w / w), most preferably 25 to 35% (w / w).

13. Rod according to any one of the preceding claims, wherein the grammage of the polymeric matrix is ​​from 10 to 70% (w / cm 2 rod); preferably 20 to 60% (w / cm 2 rod), more preferably 25 to 40% (w / cm 2 rod), more preferably 25 to 35% (w / cm 2 man).

14. Rod according to any one of the preceding claims wherein the textile fiber of the woven mesh comprises a total linear mass of 500 to 1500 DTex, preferably 800 to 1200 DTex.

15. The rod of any one of the preceding claims wherein each textile fiber of the woven mesh has a specific gravity of 2 to 8 (g / cm 3 ).

16. Rod according to any one of the preceding claims wherein the woven mesh has an opening with a size ranging from 0.1-5 mm; preferably 0.5-3 mm; more preferably 1 - 2 mm.

17. A concrete structure comprising the rod according to any one of the preceding claims.

18. A method for obtaining the composite rod according to any one of the preceding claims, comprising the following steps: arranging a plurality of fibers selected from glass fibers, basalt fibers, carbon fibers or combinations thereof in a fiber feeder to create the core of the rod; arranging a plurality of fibers to create the woven mesh; impregnating the plurality of fibers of the core and the plurality of fibers of the woven mesh in the thermosetting polymer matrix; braiding the plurality of fibers of the woven mesh with a braider and simultaneously winding at least one strand in a helical manner around the woven mesh; curing with thermal activation.

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