EP0876524B1 - Verstärkung für betonteile und verstärkte betonteile - Google Patents

Verstärkung für betonteile und verstärkte betonteile Download PDF

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Publication number
EP0876524B1
EP0876524B1 EP97902880A EP97902880A EP0876524B1 EP 0876524 B1 EP0876524 B1 EP 0876524B1 EP 97902880 A EP97902880 A EP 97902880A EP 97902880 A EP97902880 A EP 97902880A EP 0876524 B1 EP0876524 B1 EP 0876524B1
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EP
European Patent Office
Prior art keywords
core
fibres
yarn
cement
strands
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EP97902880A
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English (en)
French (fr)
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EP0876524A4 (de
EP0876524A1 (de
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Donald Henry Hourahane
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • E04C5/073—Discrete reinforcing elements, e.g. fibres
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/36—Cored or coated yarns or threads
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/447—Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/04—Heat-responsive characteristics
    • D10B2401/041—Heat-responsive characteristics thermoplastic; thermosetting

Definitions

  • THIS INVENTION relates to reinforced concrete products.
  • Hydraulicant's Polymeric fibres, tapes and meshes are used as reinforcing in hydraulic matrices (also referred to as cementitous matrices). They are the conventional products of the textile and plastics industries and are primarily intended to be used for spinning and weaving, or have been produced for other purposes.
  • hydraulic matrices of which type 1 cement (Ordinary Portland Cement) is an example, have in interfacing with them have not hitherto been addressed to the best of Applicant's knowledge.
  • polymeric reinforcing fibre, tape or mesh of high tenacity involves a draw down or stretch ratio. This can vary in the range 5:1 to 15:1 for extruded tapes and spun multi-filaments and up to 50:1 for solvent/gel spun multi-filaments. In both cases the fibre produced has a smooth surface. Some polymers from which the fibres are made are hydrophobic. For an hydraulic matrix to achieve any significant mechanical, frictional or chemical bond to fibres or yarns made in this way is virtually impossible.
  • a yarn for use in a cement mortar matrix including a core and a multitude of staple fibres forming a layer which envelopes the core and provides an extended surface area and interstical spaces for infiltration by cement fines and hydrates, the staple fibres being spun around the core and attached to the core, the staple fibres having sufficient freedom of radial movement to provide said spaces and permit ingress of cement fines and the formation of its hydrates in said spaces.
  • said core comprises two or more core strands which are twisted together, portions of the staple fibres being trapped between the core strands as the core strands are twisted together thereby to form a mechanical connection between the core strands and the staple fibres.
  • the strands of the core can have adhesive between them.
  • said core and said staple fibres are of synthetic plastics materials which weld to one another upon being softened, the core and the fibres of the layer being welded to one another at spaced locations along the length of the yarn.
  • said fibres and said core are adhered to one another at spaced locations.
  • Said layer can consist mainly of fibres with hydrophobic properties intermingled with some fibres which have hydrophillic properties. It is also possible for said layer to include soluble fibres containing additives for enhancing the properties of the hydrate crystals during their formation. Alternatively the core and/or the staple fibres can have thereon a soluble coating containing additives for enhancing the properties of the hydrate crystals during their formation.
  • the yarn can be used in the form in which it is produced but cut into pieces, or can be woven to form a tape or cloth which is embedded in the concrete matrix.
  • the leading ends of the staple fibres which are fed transversely towards the core during the spinning process can be trapped by the core strands.
  • the staple fibres are spun around the core and the core strands are twisted, they become mechanically locked together.
  • the core strands can be coated in-line with an adhesive of a type compatible with the materials of which the core strands and the staple fibres are made.
  • the staple fibres then also form a barrier which prevents the adhesive from causing a length of the coated finished yarn from sticking to an adjacent length of the yarn.
  • the function of the core strands is to provided the reinforcing.
  • the staple fibres are there to provide the means for the hydraulic matrix to grip the core strands.
  • the staple fibres offer a surface area several orders of magnitude greater than the surface area of the core strands. Furthermore, their interstices provide a void space which can be infiltrated by the hydraulic matrix, which as it crystallises envelopes the staple fibres, thus forming a composite interface between the reinforcing core and a cementaceous matrix.
  • the staple fibres preferably consist mainly of hydrophobic material so as not to interfere with the water/cement ratio which significantly influences the strength of the fully cured cement mortar, or concrete, in which the fibre product is used.
  • the staple fibres can be a blend of fibres, a small percentage of the total having hydrophillic properties, enabling them to retain sufficient water to ensure that the hydraulic matrix in contact with them is fully cured.
  • Soluble fibres, or fibres that have a soluble coating can be included to release additives into the hydraulic matrix that enhance the properties of the cement hydrate crystals as they form, without affecting the properties of the bulk of the matrix.
  • a performance enhancing additive is silica fume. This can change the ratio of the hydrates produced during hydration in an advantageous manner.
  • Another additive is gypsum anhydrate, which when in contact with cement hydrates, can cause expansion.
  • Other additives, and their effect, are known to those skilled in the art.
  • the additives can also be infiltrated into the interstices of the staple fibres and retained there by the use of a soluble coating.
  • Sodium alginate is the preferred coating.
  • the staple fibres are preferably applied to the core yarns by a spinning process.
  • An example of such a process is friction spinning as developed by Feher AG of Linz, Austria.
  • Adhesive can be applied in-line immediately prior to the spinning process.
  • the staple fibres then also serve to prevent the adhesively coated strands from sticking to each other. This could be a problem were it not an in-line process.
  • the friction spinning process therefore has to be customised to meet the needs of the method of production of the yarn according to the invention.
  • the use of multiple adhesively coated strands that converge at the point where the staple fibres are being introduced adds an adhesive bond to the mechanical interlock that occurs between the core and the staple fibres.
  • the friction spun staple fibres can be more loosely applied to the core strands if the core strands are coated with an adhesive before the friction spinning process takes place. This is of particular significance in the case of high tech fibres, where high interlaminar shear forces have to be transmitted through the interface layer of staple fibres into the ultra strong reinforcing core. Such forces can exceed 1 GPa.
  • a suitable adhesive can be made from a hot melt adhesive by dissolving it in a suitable hot solvent and allowing it to cool. A room temperature volatile gel is thus produced. This can be coated onto the core strands. The solvent volatilises leaving a thin layer of hot melt adhesive gel. The solvent can be recovered and condensed for reuse.
  • the hot melt adhesive can also be formulated to become the carrier of the matrix performance enhancing additives mentioned above.
  • the composite core can be heated. This softens the adhesive thus heat setting the friction spun fibres to the surface of the core and at the same time creating a ridged surface of adhesive on the core strands along which the staple fibres will, once in the cement matrix, not be able to slide.
  • Yarn made in accordance with this invention provides interstitial spaces into which cement and its hydrates can flow and mechanically interact with the staple fibres.
  • additives are included which chemically interact with the cement and/or its hydrates to create a preferred interface, selectively using the hydraulic matrix in which the interactive strands, or products made from them, are used to enhance the matrix where it is to become the interface with the interactive fibre strands.
  • Yarn made in accordance with this invention comprises two or more components each with its own well defined function.
  • the yarn can have:
  • the surface layer of staple fibres is preferably applied to the high tenacity core by the process known as friction spinning, for which Feher AG, of Linz, Austria supplies suitable equipment.
  • a preferred embodiment uses a plurality of core strands, the strands being fed in a cone to a nip in order to catch the leading ends of the staple fibres as these are fed transversely towards the nip. With the leading ends of the staple fibres trapped between the strands of the core, spinning serves to bind them in place. Twisting of the core strands enhances the bond.
  • the staple fibres reinforce the cement interface and transfer the load on the concrete product into the core strands.
  • a load usually results from the bending or flexing of the cement matrix or concrete product in which the yarn is used.
  • the staple fibres when wound onto the core, result in a permeable layer of fibres.
  • the latter can additionally be used to modify the properties of the adhesive by the process known as cross linking.
  • the fluorination process is known to create a polar surface on certain polymers that can improve its adhesion to hydraulic matrices.
  • the yarns of this invention are gripped mechanically, and in many cases chemically, by the hydraulic matrix. If the final product fails it is because the matrix, the interface or the fibres themselves have failed under load as pull out of the interactive fibre strands under load is not possible.
  • the crystals of hydration become the matrix in and around the staple fibres and are modified by additives in or around those staple fibres, so as to become an enhanced matrix.
  • Products made using the methods taught in this application can be internally reinforced and also reinforced to the outer surfaces of the product.
  • Replacing steel reinforcing systems in chosen applications by yarn according to this invention enables thinner, lighter cement based products to be made. Accelerators can be used that would cause the corrosion of steel, enabling moulds to be more productively utilised.
  • Bulk concrete products according to the invention are less prone to cracking. Furthermore because the physical properties of the cement matrix interface to the yarn is enhanced, the toughness of the bulk matrix is improved and the deflection under load with respect to steel reinforced concrete is reduced.
  • tapes and cloths made in accordance with the teachings of this application are more desirable than steel for the purpose of reinforcing cellular or lightweight aggregate cement based products because steel reinforcing is generally incompatible with the significantly reduced compressive strength of lightweight concrete.
  • the reinforcing core of the yarn can be man made synthetic textile yarns or natural textile yarns. Examples are rayon, nylon, polyester, polyethylene, polypropylene, carbon, Kevlar, gel spun polyethylene or zirconia glass high tech fibres.
  • All of these fibres can be characterised as having a surface requiring chemical, gas, corona discharge or irradiation treatment to create a surface to which a chemical bond can be achieved by an adhesive matrix.
  • Epoxy or polyester resins are examples of adhesives that will bond after such treatment.
  • these treatments do not yield a surface to which a water based matrix such as cement, or its hydrates, can either interlock mechanically or significantly bond chemically. Further these process are not normally used in the textile industry. This leads to multiple handling, increasing the cost of the end product.
  • Such fibres cannot therefore be used as reinforcing unless they form part of composite yarns as described herein.
  • Cement and similar hydraulic matrices are by their nature used in bulk as low cost matrices.
  • the cost of any required additive or reinforcing is a factor in determining whether or not they would be used. This does not, of course, eliminate such treatments from being used when there is a commercially or technically valid reason to do so.
  • the extended surface area of the fibres of the composite yarn provides a fibrous surface. This acts partially as a filter allowing only the finer more reactive cement particles and the hydrate gels to enter the interstices of the friction spun fibre layer.
  • hydrate gels forms. This solution is composed of water and products leached from the cement by the water.
  • Calcium hydroxide and calcium silicate hydrate are two examples. The latter is the preferred matrix or binder.
  • the staple fibres are wound in a spiral semi-hoop wise fashion.
  • the volume between the core and the spirally aligned fibres, the adhesive, or specially manufactured fibres can be used to carry additives that can enhance one or more properties of the cement hydrates.
  • additives sodium and calcium silicate, gypsum, ettringite, rapid hardening cement or pozzalans such as pulverised fuel ash, or silica fume.
  • Other additives will be known to those skilled in the art.
  • One or more of these additives can be used to cause an interaction with the hydrating cement.
  • the formation of calcium hydroxide can be suppressed in favour of the formation of calcium silica hydrate.
  • Silica fume is known to be a suitable additive in this regard.
  • the cement hydrates can be caused to expand.
  • the expansion that takes place does so within the confines of the annular space between the inside faces of the staple fibres and the core and has no effect on the bulk of the concrete within which the fibres are being utilised.
  • the additives can be present in soluble coatings on the fibres or in the adhesives used to hold the fibres in place on the core, or as particulate matter infiltrated into the interstices of the fibres and if necessary held in place by a soluble material.
  • the annularly aligned fibres constrain radially outward expansion, causing the crystals of hydration to press against the reinforcing core of the composite yarn. This leads to an enhanced grip of the core strands by the matrix.
  • Interactive fibre strands such as are described in this application adsorb water, due to reduced surface tension, before the cement hydration process commences. With the exception of natural or hydrophillic fibres they will not absorb water and so will have little or no effect on the critical water/cement ratio.
  • the calcium silicate hydrate gel from the cement particles can be encouraged to form within the cross-section defined by the outside of the core and the outer extremity of the friction spun layer of staple fibres, namely.in the area partially filled with the prechosen additives.
  • the normal hydrate ratio is of the order of 60% calcium silicate to 40% calcium hydroxide. The ratio can be altered to, for example, 80:20.
  • the calcium silicate hydrate that forms within the layer of fibres crystallises as calcium silicate.
  • Calcium silicate comprises fine, strong but brittle crystals that, as they continue to crystallise, impinge against each other and fuse together. During the crystallisation stage they occupy the interstitial spaces of the staple fibres forming a calcium silicate-fibre composite interface.
  • a characteristic of the fibre-calcium silicate composite interface is that it is a composite with a mechanical bond both to the reinforcing core and to the cement matrix. Any crystals that form inside the spirally bound hoop like fibres, expand and impinge against the reinforcing core. This effect is enhanced by the use of an additive such as gypsum anhydrate that can be within the friction spun fibre layer.
  • the fibres in the composite interface reduce the brittleness of the calcium silicate, creating a pseudo ductile interface layer.
  • the interactive composite yarn described can be used as produced ie in yarn form, or woven into a tape or cloth suitable for use in beam or sheet type applications.
  • the yarn when is used as it is produced, can be cut into pieces of some chosen length. Longer lengths are required for use in large aggregate mixes and shorter lengths for use in grout type mixes. The shorter the yarn is cut the more its friction spun staple fibres will benefit from the adhesive bond to the core of the composite yarn.
  • Interactive yarn, cloth etc can be cut using a laser or hot air gun. This also serves to fuse the ends of the staple fibres together and in the case of a thermoplastics core, to the core. This is beneficial in the absence of an adhesive bond between the fibre outer layer and the core.
  • the fibres can be uniformly dispersed throughout the mix. They serve to prevent de-mixing during pumping and placing and segregation under vibration. Because the mix remains mixed it is easier to obtain site test results that compare with those obtained in the laboratory.
  • the reduced surface tension around the strands causes free water to be adsorbed from the concrete mix thus preventing the formation of surface puddles which, when they evaporate, reduce the water-cement ratio.
  • the water adsorbed by the strands remains available to the cement throughout the hydration process.
  • Reinforcing interactive composite yarns made with a high elongation core can be pre-stressed by, for example, 20%. At practical diameters this results in a reduction of about 10% in the diameter of the reinforcing core.
  • Tape and woven cloth made from the interactive yarns described can be dipped into a fluidised bed containing a cementitous powder.
  • the powder infiltrates the friction spun layer of stable fibres.
  • they can be wrapped in a layer of impermeable material such as polyethylene film to keep the dry cement mixture in place.
  • a non-woven finely textured tissue can be used. The later can remain in place as a component of the end product.
  • preimpregnated materials need only involve their being wetted and allowed to drain, prior to being used in a mould or against a former for moulding.
  • Pre-impregnated materials are suitable for hand or machine lay up into sheet-like structures. Alternatively they can form the surfaces of a cellular or normal density sandwich panel.
  • Interactive fibre strands can be used to create satin weave or knitted cloths enabling articles with complex curvatures to be made using these techniques.
  • Polymeric fibres have the advantage of being non aggressive and are therefore not harmful either to the hands of the user, or to the environment in which they are used.
  • Cloth made from interactive composite yarn acts as a filter. When used to line shuttering it provides a mesh which prevents large aggregate particles from reaching the surface of a shutter during casting. Fines from the concrete mix penetrate the mesh and, flow through the mesh in a controlled manner. The space bounded by the shutter fills from the bottom up, the cement fines displacing air as the space against the shutter face is filled.
  • Material made in this way can be used after the fashion of papier mache to create strong thin fibre cement mouldings, such as garden ornaments, floor tiles, roofing sheets and boat hulls.
  • the methods described enable cement matrixed mouldings with more than 10% of fibres by volume to be made. This results in thin, light strong finished products. Because proportionately less matrix is used, additives can be incorporated into the cement matrix, without having a major impact on the cost of the final product. This enables products made using hydraulic matrices to compete for market share with those made from solvent based, or catalytic resin systems.
  • Reinforcing yarn with a friction spun surface is particularly suitable for use in cellular cement and low density aggregate cement mixes where traditional reinforcing, such as steel bars or meshes, are less effective.
  • the cellular/lightweight aggregate mixes develop insufficient strength to be able to grip steel reinforcing.
  • the larger surface area of the described yarn etc is more suitable.
  • Cellular fibre or lightweight aggregate cement mixes used in conjunction with woven cloth or tape made in accordance with the methods disclosed in this application are suitable as an alternative to wooden joists or plywood.
  • the cement composite fibre ply is suitable for use where marine ply would otherwise be specified and is particularly suitable for use as lost formwork. Such a formwork remains in place as the finished surface of the concrete.
  • a specific example of application is waffle or trough type floors as it avoids the problem of having to strip, clean and store large mouldings or shutters.
  • a further example of use is as highway barriers. These can stack for ease of transport, can be quickly positioned and bolted together without the need for lifting equipment.
  • the hollow core can be used to hold a plastics bag filled with water.
  • a vent valve can be provided on the bag to allow the water to escape at a controlled rate on impact.
  • the units can be back filled with soil, sand, or concrete. In the latter case they can be used with a weak mix as left in situ moulds, or with a strong mix as re-usable moulds.
  • Figure 1 illustrates the preferred method of producing a yarn in accordance with the present invention.
  • the two strands designated 18 and 20 together constitute a core designated 22.
  • the strands 18 and 20 are fed on a converging path to a nip.
  • the staple fibres 26 are presented to the strands and their leading ends are trapped between the strands.
  • the strands preferably have an adhesive coating 24 applied thereto just before they reach the nip.
  • the adhesive coating secures the strands 18, 20 to one another and also assists in binding the staple fibres.
  • the staple fibres 26 themselves form a cover for the adhesive coating 24. This prevents adhesion between turns of the yarn when it is wound onto a bobbin or the like.
  • the yarn produced by the process described has a central core and a fluffy sheath of staple fibres.
  • Each fibre has the end thereof which was presented to the nip trapped between the strands and the remainder of the fibre is wound in a helical manner around the core. Because each staple fibres is overlapped by a multitude of other staple fibres, the end result is that the core is entirely sheathed by a layer of staple fibres.
  • the staple fibres of the sheath are secured to the core at intervals along the length of the yarn. This can be achieved by passing the yarn through heated rollers which make contact with the yarn at intervals of, for example, 5mm. As each individual staple fibre extends for about 40mm along the core. it is thus attached to the core at six to nine locations.
  • the resulting yarn as shown in Figure 2, has spaced locations 30 at which the fibres of the sheath are secured to the sheath. Between these locations the fibres are spaced outwardly from the sheath leaving an annular gap between the core and the staple fibres. It is these gaps that the cement fines and hydrates enter when the yarn is used for reinforcing purposes.
  • Figure 3 is a diagrammatic cross section which shows the strands 18, 20. It also shows the fibres 26.
  • Reference numeral 28 designates crystals that have formed within the fibrous cover constituted by the staple fibres 26. As explained above the product can include an additive which promotes formation of the requisite crystals.
  • staple fibres of different types can be hydrophobic, 5% can be hydrophillic and 5% can be of resorbable material.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Woven Fabrics (AREA)

Claims (9)

  1. Werkstoffstrang zur Verwendung in einer Zementmörtelmatrix, wobei der Werkstoffstrang einen Kem und eine Vielzahl von Stapelfasern umfasst, welche eine Schicht bilden, die den Kern umschließt, und die eine ausgedehnte Oberfläche und Zwischenräume zur Befüllung mit feinen Zementpartikeln und - hydraten bereitstellt, wobei die Stapelfasern um den Kern herum gesponnen und an dem Kern befestigt sind, wobei die Stapelfasern eine genügende Freiheit für eine radiale Bewegung aufweisen, um die Zwischenräume auszubilden und das Eindringen von feinen Zementpartikeln und die Bildung seiner Hydrate in den Zwischenräumen zu ermöglichen.
  2. Werkstoffstrang gemäß Anspruch 1, wobei der Kern zwei oder mehr Kernstränge aufweist, welche miteinander verzwirnt sind, wobei Teile der Stapelfasern bei der Verzwirnung der Kernstränge zwischen den Kernsträngen eingefangen werden, wodurch eine mechanische Verbindung zwischen den Kernsträngen und den Stapelfasern ausgebildet wird.
  3. Werkstoffstrang gemäß Anspruch 1 oder 2, wobei die Stränge des Kerns Klebstoff dazwischen aufweisen.
  4. Werkstoffstrang gemäß Anspruch 1, 2 oder 3, wobei der Kern und die Stapelfasern aus synthetischen Kunststoffmaterialien bestehen, welche beim Weichmachen miteinander verschweißen, wobei der Kern und die Fasern der Schicht an voneinander beabstandeten Stellen entlang der Länge des Werkstoffstrangs miteinander verschweißt werden.
  5. Werkstoffstrang gemäß Anspruch 1, 2 oder 3, wobei die Fasern und der Kern an voneinander beabstandeten Stellen miteinander verklebt werden.
  6. Werkstoffstrang gemäß irgendeinem der vorherigen Ansprüche, wobei die Schicht hauptsächlich aus Fasern mit hydrophoben Eigenschaften besteht, die mit einigen Fasern vermischt sind, welche hydrophile Eigenschaften aufweisen.
  7. Werkstoffstrang gemäß irgendeinem der vorherigen Ansprüche, wobei die Schicht lösliche Fasern umfasst, welche Zusatzstoffe zur Verbesserung der Eigenschaften der Hydratkristalle während ihrer Entstehung enthalten.
  8. Werkstoffstrang gemäß irgendeinem der vorherigen Ansprüche, wobei der Kern und/oder die Stapelfasern eine lösliche Beschichtung aufweisen, welche Zusatzstoffe zur Verbesserung der Eigenschaften der Hydratkristalle während ihrer Entstehung enthalten.
  9. Betonprodukt, welches durch einen Werkstoffstrang gemäß irgendeinem der vorherigen Ansprüche verstärkt ist.
EP97902880A 1996-01-15 1997-01-15 Verstärkung für betonteile und verstärkte betonteile Expired - Lifetime EP0876524B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA9600296 1996-01-15
ZA96296 1996-01-15
PCT/US1997/000362 WO1997026395A1 (en) 1996-01-15 1997-01-15 Reinforcing for concrete products and reinforced concrete products

Publications (3)

Publication Number Publication Date
EP0876524A1 EP0876524A1 (de) 1998-11-11
EP0876524A4 EP0876524A4 (de) 1999-04-14
EP0876524B1 true EP0876524B1 (de) 2003-10-01

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EP97902880A Expired - Lifetime EP0876524B1 (de) 1996-01-15 1997-01-15 Verstärkung für betonteile und verstärkte betonteile

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EP (1) EP0876524B1 (de)
AT (1) ATE251240T1 (de)
AU (1) AU718617B2 (de)
DE (1) DE69725284T2 (de)
WO (1) WO1997026395A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013067034A1 (en) * 2011-11-01 2013-05-10 Cortex Composites, Llc Nonwoven cementitious composite for in-situ hydration
US10167635B2 (en) 2011-11-01 2019-01-01 Cortex Composites, Inc. Nonwoven cementitious composite for In-Situ hydration

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002232967A1 (en) * 2000-08-24 2002-04-29 Donald Henry Hourahane Manufacture of cellular material
US6569525B2 (en) 2001-04-25 2003-05-27 W. R. Grace & Co.-Conn. Highly dispersible reinforcing polymeric fibers
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ATE251240T1 (de) 2003-10-15
DE69725284T2 (de) 2004-08-19
AU718617B2 (en) 2000-04-20
DE69725284D1 (de) 2003-11-06
EP0876524A4 (de) 1999-04-14
WO1997026395A1 (en) 1997-07-24
AU1695097A (en) 1997-08-11
EP0876524A1 (de) 1998-11-11

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