EP1282751B1 - Steel fibers - Google Patents

Steel fibers Download PDF

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Publication number
EP1282751B1
EP1282751B1 EP01947278A EP01947278A EP1282751B1 EP 1282751 B1 EP1282751 B1 EP 1282751B1 EP 01947278 A EP01947278 A EP 01947278A EP 01947278 A EP01947278 A EP 01947278A EP 1282751 B1 EP1282751 B1 EP 1282751B1
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Prior art keywords
wire
section
wire fibre
concrete
fiber
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EP01947278A
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German (de)
French (fr)
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EP1282751A1 (en
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René Pepin
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ArcelorMittal Bissen and Bettembourg SA
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Trefilarbed Bissen SA
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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
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/012—Discrete reinforcing elements, e.g. fibres

Definitions

  • the invention relates to a rod-shaped wire fiber made of metal for use for the reinforcement of moldable materials, in particular concrete.
  • steel fibers used as reinforcing elements For concrete, which will also be understood below as screed and mortar, i.a. Steel fibers used as reinforcing elements.
  • a concrete reinforced with steel fibers is improved in its properties, for example, tensile strength, breaking strength, shear strength, stretchability, toughness, dynamic strength, fatigue strength. It is therefore used more and more.
  • the steel fiber should have the following properties: It should be tough and firm. When mixing with concrete or aggregates it should not break. It should not be too short or too thick, otherwise it will be insufficient in its strength. It should not be too long or too thin, otherwise it is difficult to process and tends to form spherical cement lumps - also called hedgehogs.
  • a steel fiber cross section of 0.1 to 1.4 mm 2 In general, a steel fiber cross section of 0.1 to 1.4 mm 2, a steel fiber length of 10 to 70 mm and a weight fraction of steel fibers of 15 to 150 kg / m 3 concrete are recommended. In addition to their properties, the cost-effective production of steel fibers is the top condition.
  • Wire fibers made of steel for reinforcing concrete have long been known, in different configurations in rod form, uniform over the length corrugated shape, chip shape or surface profiling, such as in the magazine "Beton, 1989, No. 4, page 178 to 180 by Gerd Humert "Steel Wire Fibers in Practice".
  • wire fibers are corrugated uniformly over their length, as well as in the Dutch Offenlegungsschrift 8001609 a evenly distributed over their length alternately stepwise stepped (right angle waved) wire fiber.
  • wire fibers are proposed, which either have a uniformly profiled surface in the longitudinal direction or be deformed in its entirety from the bar shape into other configurations, such as S-shape, O-shape, triangular shape, loops and the like, to improve anchoring in concrete.
  • British Patent 1446855 discloses corrugated and widened-end wire fibers, as well as US Pat. No. 2,677,955 with corrugations and reinforcing fibers for concrete, all of which form fiber out of the rod shape.
  • a wire fiber is created, which has a lower rebound rate and at the same time allows a good anchoring of the fiber.
  • the wire fiber according to the invention is thus able to enable good anchoring and adhesion by a differentiated shaping in concrete, in which the aggregates are also processed with different grain sizes and degrees of fineness.
  • the wire fiber according to the invention is readily pourable and can be evenly distributed within the still flowable concrete mass.
  • the metal wire fiber has a center piece, two connected to the middle piece, bent intermediate pieces and in each case one connected to the intermediate pieces tail.
  • the tail is bent over the intermediate piece such that the tail is substantially parallel to the center piece.
  • the end pieces are flattened at least in a partial area.
  • the middle piece and the two bent intermediate pieces have a circular cross-section.
  • Wire fibers are produced in very large numbers, so that the manufacturing tolerances are relatively large.
  • the wire fibers are formed symmetrically, wherein the middle piece on the two sides each having an intermediate piece with the corresponding end piece.
  • the two end pieces and the center piece of the wire fiber are in a plan.
  • the two spacers of the filament are in one direction, i. bent to one side.
  • Wire fibers for use in reinforcing moldable materials, particularly concrete usually have a length of about 10 to 70 mm and a maximum diameter of up to about 1.3 mm.
  • the intermediate piece together with the end piece has a length of 5 to 20 times the diameter of the wire fiber
  • the flattened end piece a length (I, I ') of 2 to 10 times, preferably 3 to 5 times, the diameter of the wire fiber and a width (B) of 1.5 to 3.5 times the diameter of the wire fiber
  • the bent intermediate piece has a "height" (h, h ') of 2 to 10 times, preferably 3 to 5 times, the diameter of the wire fiber.
  • the wire fibers of the invention can be easily manufactured with the usual machines, of course, the forming parts ie rolls of these machines the form of the wire fiber must be changed accordingly
  • a wire fiber is made of a high-tensile steel having a natural size (L) of 30 mm in a diameter of 0.7 mm.
  • Wire fibers preferably in lengths of 30 to 60 mm with diameters of max. 1.3 mm, are used for the reinforcement of concrete, in which they are evenly mixed in the still flowable state of the concrete.
  • the wire fiber according to Fig. 1 has a central piece L 'and at the two ends of this center piece in each case a z-shaped double kink or hook.
  • the end pieces are partially or completely flattened, which makes the anchorage better and reduces the rebound of the wire fiber.
  • the middle piece and the intermediate pieces have a circular cross-section.
  • the flattened end pieces in this example are about 2-4 mm long (I, I ') and 1.2 to 2 mm (B) wide and dovetail-shaped.
  • the wire used to make this wire has a tensile strength of about 1100 N / mm 2.
  • Fig. 2 shows the same wire fiber in plan view whereby the flattened end pieces are better visible.
  • the fiber described above was tested in accordance with the Bündner guidelines BB2 - 711.100 (October 1998). Shotcrete with a cement content of 425 kg / m 3 according to CEM I 42.5) was used as the building material.
  • the additive used was a plasticizer (Rheobuild 3520 from MBT) in a dosage of 1.2% (based on cement paste), a stabilizer (Delvo Stabi) in a dosage of 0.2% (based on cement paste) and 35 kg / m 3 steel fibers used.
  • the ready-to-use shotcrete had a consistency of 51.0 cm determined by: Slump (according to DIN 1048), a wet chamber weight of 2372 kg / m 3 , an LP content of 1.5% and a TM value: 0.52.
  • the steel fiber content in the hardened concrete is determined by drilling cores.
  • a single value represents the mean of at least three drill cores taken within 1m 2.
  • the core length must be over 5 cm.
  • the amount of sample used to determine a single value must not be less than 5 kg.
  • test specimens each in the form of drill cores with a diameter of 100 mm were tested.
  • the tested sample has on average a steel fiber content of 30.4 kg / m 3 concrete.
  • the ready-to-use shotcrete had a consistency of 54.0 cm determined by: Slump (according to DIN 1048), a wet chamber weight of 2398 kg / m 3 , an LP content of 1.7% and a TM value: 0.50.
  • test pieces in the form of cores with a diameter of 100mm were tested.
  • the tested sample has an average steel fiber content of 37.0 kg / m 3 concrete.
  • the tested sample has on average a steel fiber content of 29.5 kg / m 3 concrete ie a loss of 26%.
  • fibers of the type HE 07/30 of the applicant were tested (40 kg / m3). These fibers comprise a central piece, two intermediate pieces connected to the middle piece and one end piece each connected to the intermediate piece, the end piece being bent relative to the intermediate piece such that the end piece is substantially parallel to the middle piece.
  • the tail is round and, unlike the fiber of the invention, not flattened.
  • the tested sample has on average a steel fiber content of 25.7 kg / m 3 of concrete ie a loss of 36%.

Abstract

The invention relates to steel fibers to be used to reinforce formable materials, especially concrete, comprising a central part, two intermediate parts offset and joined to said central part as well as an end part joined to each intermediate part. Said end part is offset from the intermediate part, such that said end part, substantially parallel to said intermediate part, is characterized in that it is partially flattened.

Description

Die Erfindung betrifft eine stabförmige Drahtfaser aus Metall zur Verwendung für die Verstärkung von formbaren Werkstoffen, insbesondere Beton.The invention relates to a rod-shaped wire fiber made of metal for use for the reinforcement of moldable materials, in particular concrete.

Für Beton, worunter im folgenden auch Estrich und Mörtel verstanden werden, werden u.a. Stahlfasern als Bewehrungselemente verwendet. Ein mit Stahlfasern bewehrter Beton ist in seinen Eigenschaften, zum Beispiel Zugfestigkeit, Bruchfestigkeit, Scherfestigkeit, Streckvermögen, Zähigkeit, dynamische Festigkeit, Ermüdungsfestigkeit, verbessert. Man verwendet ihn deshalb in immer größerem Umfang. Die Stahlfaser soll dabei folgende Eigenschaften aufweisen: Sie soll zäh und fest sein. Beim Vermischen mit Beton oder Zuschlagstoffen soll sie nicht brechen. Sie soll nicht zu kurz oder zu dick sein, da sie sonst unzureichend in ihrem Verstärkungsvermögen ist. Sie soll nicht zu lang oder zu dünn sein, da sie sonst schwer verarbeitbar ist und zur Bildung von kugeligen Zementklumpen - auch Igel genannt - neigt. Allgemein werden ein Stahlfaser-Querschnitt von 0,1 bis 1,4 mm2, eine Stahlfaser-Länge von 10 bis 70 mm und ein Gewichtsanteil der Stahlfasern von 15 bis 150 kg/m3 Beton empfohlen. Neben ihren Eigenschaften ist die kostengünstige Herstellung der Stahlfasern oberste Bedingung.For concrete, which will also be understood below as screed and mortar, i.a. Steel fibers used as reinforcing elements. A concrete reinforced with steel fibers is improved in its properties, for example, tensile strength, breaking strength, shear strength, stretchability, toughness, dynamic strength, fatigue strength. It is therefore used more and more. The steel fiber should have the following properties: It should be tough and firm. When mixing with concrete or aggregates it should not break. It should not be too short or too thick, otherwise it will be insufficient in its strength. It should not be too long or too thin, otherwise it is difficult to process and tends to form spherical cement lumps - also called hedgehogs. In general, a steel fiber cross section of 0.1 to 1.4 mm 2, a steel fiber length of 10 to 70 mm and a weight fraction of steel fibers of 15 to 150 kg / m 3 concrete are recommended. In addition to their properties, the cost-effective production of steel fibers is the top condition.

Drahtfasern aus Stahl zur Verstärkung von Beton sind seit langem bekannt, und zwar in unterschiedlicher Konfiguration in Stabform, gleichmäßig über die Länge gewellter Form, Spanform oder auch mit Oberflächenprofilierung, wie beispielsweise in der Zeitschrift "Beton, 1989, Heft 4, Seite 178 bis 180" von Gerd Humert "Stahldrahtfasern in der Praxis" beschrieben.Wire fibers made of steel for reinforcing concrete have long been known, in different configurations in rod form, uniform over the length corrugated shape, chip shape or surface profiling, such as in the magazine "Beton, 1989, No. 4, page 178 to 180 by Gerd Humert "Steel Wire Fibers in Practice".

Zur Erhöhung der Zugfestigkeit und Festigkeit des Betons ist insbesondere eine ausreichende Haftung und Verankerung der Drahtfasern in dem Beton erforderlich. Hierzu sind eine Reihe von Vorschlägen unterbreitet worden. Gemäss der EP-PS 0130 191 werden Drahtfasern über ihre Länge gleichmäßig gewellt, ebenso wird in der niederländischen Offenlegungsschrift 8001609 eine gleichmäßig über ihre Länge abwechselnd stufenförmig abgesetzte (rechtwinklig gewellte) Drahtfaser vorgeschlagen.To increase the tensile strength and strength of the concrete in particular sufficient adhesion and anchoring of the wire fibers in the concrete is required. To this end, a number of proposals have been made. According to EP-PS 0130 191, wire fibers are corrugated uniformly over their length, as well as in the Dutch Offenlegungsschrift 8001609 a evenly distributed over their length alternately stepwise stepped (right angle waved) wire fiber.

Aus der US 6,045,910 sind Drahtfasern bekannt die ein Mittelstück aufweisen mit einem Z- oder L-förmigen Haken aufweisen die jeweils aus einem Zwischenstück und einem Endstück bestehen. Die Z- oder L-förmigen Haken d.h. die Zwischenstücke und die Endstücke sind durch Abflachen deformiert.From US 6,045,910 wire fibers are known which have a center piece having a Z- or L-shaped hook each consisting of an intermediate piece and an end piece. The Z- or L-shaped hooks i. the spacers and the end pieces are deformed by flattening.

Auch in der DE-OS 23 05 651 werden Drahtfasern vorgeschlagen, die entweder eine gleichmäßig profilierte Oberfläche in Längserstreckung aufweisen oder in ihrer Gänze aus der Stabform in andere Konfigurationen, wie S-Form, O-Form, Dreieckform, Schlaufen und dergleichen verformt werden, um die Verankerung im Beton zu verbessern. Auch aus der britischen Patentschrift 1446 855 sind gewellte und mit verbreiterten Enden ausgebildete Drahtfasern bekannt, ebenso aus der US-PS 2,677,955 mit Wellungen und die Faser in ihrer Gänze aus der Stabform herausführender Formgebung gestaltete Armierungsfasern für Beton.Also in DE-OS 23 05 651 wire fibers are proposed, which either have a uniformly profiled surface in the longitudinal direction or be deformed in its entirety from the bar shape into other configurations, such as S-shape, O-shape, triangular shape, loops and the like, to improve anchoring in concrete. Also, British Patent 1446855 discloses corrugated and widened-end wire fibers, as well as US Pat. No. 2,677,955 with corrugations and reinforcing fibers for concrete, all of which form fiber out of the rod shape.

Zur weiteren Verbesserung der Haftungsfähigkeit der Drahtfasern aus Metall in Beton wurde gemäss DE-GM 88 15 120 eine Armierungsfaser in Stabform aus Metall vorgeschlagen, deren Oberfläche mittels Riefen profiliert ist. Des weiteren wurde eine weitere Steigerung der Haftfähigkeit von Drahtfasern aus Metall in Beton, die mit oberflächigen Profilierungen versehen sind, dadurch erreicht, dass in Stabform vorliegende Drahtfasern an ihren Enden abgebogen sind, wie beispielsweise in dem DE-GM 90 06 524 beschrieben. US 3 942 955 A beschreibt eine Drahtfaser mit den Merkmalen des Oberbegriffs des Anspruchs 1.To further improve the adhesion of the wire fibers of metal in concrete, a reinforcing fiber was proposed in rod form of metal according to DE-GM 88 15 120, the surface of which is profiled by grooves. Furthermore, a further increase in the adhesiveness of metal wire fibers in concrete, which are provided with surface profilings, achieved in that rod-shaped wire fibers are bent at their ends, as described for example in DE-GM 90 06 524. US 3 942 955 A describes a wire fiber having the features of the preamble of claim 1.

Ein ungelöstes Problem insbesondere im Bereich Spritzbeton besteht darin, daß ein großer Teil der Stahlfasern zurückprallt. In der Literatur ("Steelfibre Rebound in Shotconcrete" Hugo Armelin & Nemkumar Banthia, Canadian Society of Civil Engineering, October 1998) spricht man von 30 - 80% der Fasern die zurückprallen während jedoch nur zwischen 20 und 40% des Betons zurückprallen. In anderen Worten, es prallen mehr Fasern als Beton zurück, wodurch der Gehalt an Fasern im fertigen Beton schwer voraussagbar wird.An unsolved problem, especially in the field of shotcrete is that a large part of the steel fibers bounces back. The literature ("Steelfibre Rebound in Shotconcrete" Hugo Armelin & Nemkumar Banthia, Canadian Civil Society of Civil Engineering, October 1998) refers to 30-80% of the fibers rebounding but bouncing back only between 20 and 40% of the concrete. In other words, more fibers repel than concrete, making the content of fibers in the finished concrete difficult to predict.

Aufgabe der ErfindungObject of the invention

Aufgabe der vorliegenden Erfindung ist es folglich, Drahtfasern aus Metall zur Verwendung für die Verstärkung von formbaren Werkstoffen, insbesondere Beton zu schaffen, die eine geringere Rückprallquote aufweisen als herkömmliche Fasern.It is therefore an object of the present invention to provide metal wire fibers for use in reinforcing moldable materials, in particular concrete, which have a lower rebound rate than conventional fibers.

Allgemeine Beschreibung der ErfindungGeneral description of the invention

Diese Aufgabe wird durch Ausbildung von Drahtfasern aus Metall gemäss Patentanspruch 1 erreicht.This object is achieved by forming wire fibers of metal according to claim 1.

Mit der Erfindung wird eine Drahtfaser geschaffen, die eine geringere Rückprallquote aufweist und gleichzeitig eine gute Verankerung der Faser erlaubt. Die erfindungsgemäße Drahtfaser ist damit in der Lage, in Beton, in dem auch mit unterschiedlichen Körnungen und Feinheitsgraden der Zuschlagstoffe gearbeitet wird, gute Verankerung und Haftung durch eine differenzierte Formgebung zu ermöglichen. Darüber hinaus ist die erfindungsgemäße Drahtfaser gut schüttbar und lässt sich gleichmäßig innerhalb der noch fließfähigen Betonmasse verteilen.With the invention, a wire fiber is created, which has a lower rebound rate and at the same time allows a good anchoring of the fiber. The wire fiber according to the invention is thus able to enable good anchoring and adhesion by a differentiated shaping in concrete, in which the aggregates are also processed with different grain sizes and degrees of fineness. In addition, the wire fiber according to the invention is readily pourable and can be evenly distributed within the still flowable concrete mass.

Vorteilhafte Ausgestaltungen der Erfindung sind den kennzeichnenden Merkmalen der Unteransprüche entnehmbar.Advantageous embodiments of the invention are the characterizing features of the dependent claims removed.

Die Drahtfaser aus Metall weist ein Mittelstück, zwei mit dem Mittelstück verbundene, abgeknickte Zwischenstücke und jeweils ein mit den Zwischenstücken verbundenes Endstück auf. Das Endstück ist gegenüber dem Zwischenstück derart abgeknickt, daß das Endstück im wesentlichen parallel zu dem Mittelstück ist. Die Endstücke sind zumindest in einem Teilbereich abgeflacht.The metal wire fiber has a center piece, two connected to the middle piece, bent intermediate pieces and in each case one connected to the intermediate pieces tail. The tail is bent over the intermediate piece such that the tail is substantially parallel to the center piece. The end pieces are flattened at least in a partial area.

Das Mittelstück und die beiden abgeknickten Zwischenstücke weisen einen kreisförmigen Querschnitt auf.The middle piece and the two bent intermediate pieces have a circular cross-section.

Drahtfasern werden in sehr großer Stückzahl hergestellt, so daß die Fertigungstoleranzen relativ groß sind.Wire fibers are produced in very large numbers, so that the manufacturing tolerances are relatively large.

Vorzugsweise sind die Drahtfasern symmetrisch ausgebildet wobei das Mittelstück an den zwei Seiten jeweils ein Zwischenstück mit dem entsprechenden Endstück aufweist.Preferably, the wire fibers are formed symmetrically, wherein the middle piece on the two sides each having an intermediate piece with the corresponding end piece.

Gemäß einer bevorzugten Ausführung liegen die beiden Endstücke und das Mittelstück der Drahtfaser in einem Plan.According to a preferred embodiment, the two end pieces and the center piece of the wire fiber are in a plan.

Normalerweise sind die beiden Zwischenstücke der Drahtfaser in eine Richtung d.h. zu einer Seite hin abgeknickt.Normally, the two spacers of the filament are in one direction, i. bent to one side.

Drahtfasern zur Verwendung für die Verstärkung von formbaren Werkstoffen, insbesondere Beton, haben meist eine Länge von etwa 10 bis 70 mm und einen maximalen Durchmesser bis zu etwa 1,3 mm.Wire fibers for use in reinforcing moldable materials, particularly concrete, usually have a length of about 10 to 70 mm and a maximum diameter of up to about 1.3 mm.

In der Regel hat das Zwischenstück zusammen mit dem Endstück eine Länge von 5 bis 20 mal den Durchmesser der Drahtfaser, das abgeflachte Endstück eine Länge (I, I') von 2 bis 10 mal, vorzugsweise 3 bis 5 mal, den Durchmesser der Drahtfaser und eine Breite (B) von 1.5 bis 3.5 mal den Durchmesser der Drahtfaser, das abgeknickte Zwischenstück eine "Höhe" (h, h') von 2 bis 10 mal, vorzugsweise 3 bis 5 mal, den Durchmesser der Drahtfaser hat.In general, the intermediate piece together with the end piece has a length of 5 to 20 times the diameter of the wire fiber, the flattened end piece a length (I, I ') of 2 to 10 times, preferably 3 to 5 times, the diameter of the wire fiber and a width (B) of 1.5 to 3.5 times the diameter of the wire fiber, the bent intermediate piece has a "height" (h, h ') of 2 to 10 times, preferably 3 to 5 times, the diameter of the wire fiber.

Für spezielle Anwendungen können diese Maße natürlich auch unter- oder überschritten werden.For special applications, these dimensions can of course be under or exceeded.

Die erfindungsgemäßen Drahtfasern können problemlos mit den gängigen Maschinen hergestellt werden, wobei natürlich die formgebende Teile d.h. Walzen dieser Maschinen der Form der Drahtfaser entsprechend umgeändert werden müssenThe wire fibers of the invention can be easily manufactured with the usual machines, of course, the forming parts ie rolls of these machines the form of the wire fiber must be changed accordingly

Beschreibung anhand der FigurenDescription based on the figures

Im folgenden wird eine Ausgestaltung der Erfindung anhand der beiliegenden Figuren beschrieben. Es zeigen:

  • Fig.1: eine Drahtfaser in der Seitenansicht,
  • Fig.2: eine Drahtfaser in der Draufsicht,
In the following an embodiment of the invention will be described with reference to the accompanying figures. Show it:
  • 1 shows a wire fiber in the side view,
  • 2: a wire fiber in plan view,

In der Fig. 1 ist eine Drahtfaser aus einem Stahl hoher Zugfestigkeit, die bei natürlicher Größe eine Länge (L) von 30 mm bei einem Durchmesser von 0.7 mm aufweist. Drahtfasern, bevorzugt in Längen von 30 bis 60 mm bei Durchmessern von max. 1,3 mm, werden für die Armierung von Beton eingesetzt, in den sie im noch fließfähigen Zustand des Betons gleichmäßig eingemischt werden.In Fig. 1, a wire fiber is made of a high-tensile steel having a natural size (L) of 30 mm in a diameter of 0.7 mm. Wire fibers, preferably in lengths of 30 to 60 mm with diameters of max. 1.3 mm, are used for the reinforcement of concrete, in which they are evenly mixed in the still flowable state of the concrete.

Die Drahtfaser nach Fig. 1 weist ein Mittelstück L' und an den beiden Enden dieses Mittelstücks jeweils einen z-förmigen Doppelknick oder Haken auf. Diese Haken sind im Prinzip symmetrisch und weisen ein Zwischenstück mit einen Winkel α gegenüber dem Mittelstück von ungefähr 45° +/- 10° auf und jeweils ein Endstück das im im wesentlichen parallel zu dem Mittelstück ist und um h, h' = 1,8 +/- 1 mm versetzt. Die Endstücke sind zum Teil oder ganz abgeflacht wodurch die Verankerung besser wird und der Rückprall der Drahtfaser vermindert wird.The wire fiber according to Fig. 1 has a central piece L 'and at the two ends of this center piece in each case a z-shaped double kink or hook. These hooks are in principle symmetrical and have an intermediate piece with an angle α with respect to the center piece of approximately 45 ° +/- 10 ° and in each case an end piece which is substantially parallel to the middle piece and h, h '= 1.8 Offset by +/- 1 mm. The end pieces are partially or completely flattened, which makes the anchorage better and reduces the rebound of the wire fiber.

Das Mittelstück und die Zwischenstücke weisen einen kreisförmigen Querschnitt auf.The middle piece and the intermediate pieces have a circular cross-section.

Die abgeflachten Endstücke sind in diesem Beispiel ungefähr 2-4 mm lang (I, I') und 1.2 bis 2 mm (B) breit und sind schwalbenschwanzförmig ausgebildet.The flattened end pieces in this example are about 2-4 mm long (I, I ') and 1.2 to 2 mm (B) wide and dovetail-shaped.

Der Draht der für die Herstellung dieser Drahtfaser benutzt wurde weist eine Zugfestigkeit von ungefähr 1100 N/mm2 auf.The wire used to make this wire has a tensile strength of about 1100 N / mm 2.

Die Fig. 2 zeigt dieselbe Drahtfaser in der Draufsicht wodurch die abflachten Endstücke besser sichtbar werden.Fig. 2 shows the same wire fiber in plan view whereby the flattened end pieces are better visible.

BEISPIEL 1EXAMPLE 1

Die oben beschriebene Faser wurde gemäss den Bündner Richtlinien BB2 - 711.100 (Oktober 1998) getestet. Als Baustoff wurde Spritzbeton mit einem Zementgehalt von 425 kg/m3 gemäss CEM I 42.5) verwendet. Als Zusatzmittel wurde ein Fließmittel (Rheobuild 3520 der Firma MBT) in einer Dosierung von 1.2 % (bez. auf Zementmasse), ein Stabilisator (Delvo Stabi) in einer Dosierung von 0.2 % (bez. auf Zementmasse) sowie 35 kg/m3 Stahlfasern verwendet. Der gebrauchsfertige Spritzbeton hatte ein Konsistenzmass von 51.0 cm bestimmt nach: Ausbreitmass (nach DIN 1048), ein Nassraumgewicht verdichtet von 2372 kg/m3, ein LP-Gehalt von 1.5 % sowie einen WZ-Wert: 0.52.The fiber described above was tested in accordance with the Bündner guidelines BB2 - 711.100 (October 1998). Shotcrete with a cement content of 425 kg / m 3 according to CEM I 42.5) was used as the building material. The additive used was a plasticizer (Rheobuild 3520 from MBT) in a dosage of 1.2% (based on cement paste), a stabilizer (Delvo Stabi) in a dosage of 0.2% (based on cement paste) and 35 kg / m 3 steel fibers used. The ready-to-use shotcrete had a consistency of 51.0 cm determined by: Slump (according to DIN 1048), a wet chamber weight of 2372 kg / m 3 , an LP content of 1.5% and a TM value: 0.52.

Der Stahlfasergehalt im Festbeton wird anhand von Bohrkernen bestimmt. Ein Einzelwert stellt das Mittel aus mindestens drei, innerhalb von 1m2 entnommenen, Bohrkernen dar. Die Bohrkernlänge muss über 5 cm sein. Die Probenmenge zur Bestimmung eines Einzelwertes darf 5 kg nicht unterschreiten.The steel fiber content in the hardened concrete is determined by drilling cores. A single value represents the mean of at least three drill cores taken within 1m 2. The core length must be over 5 cm. The amount of sample used to determine a single value must not be less than 5 kg.

Jeweils vier Prüfkörper in Form von Bohrkernen mit einem Durchmesser von 100 mm wurden getestet.Four test specimens each in the form of drill cores with a diameter of 100 mm were tested.

Untersuchungsergebnisse:Findings:

PrüfkörperbezeichnungPrüfkörperbezeichnung Massenmasses Rohdichte P110 [kg/m3]Bulk density P 110 [kg / m 3 ] MFa/M110 [%]M Fa / M 110 [%] Fasergehaltfiber content M110[g]M 110 [g] MFa[g]M Fa [g] kg/m3 Betonkg / m 3 concrete Verlust [%]Loss [%] 8821/18821/1 1860.11860.1 24.724.7 21782178 1.331:33 28.928.9 1717 8821/28821/2 1835.91835.9 25.325.3 21442144 1.381:38 29.529.5 1616 8821 / 38821/3 1740.11740.1 25.425.4 22102210 1.461:46 32.332.3 88th 8821 / 48821/4 1829.61829.6 26.626.6 21482148 1.451:45 31.231.2 1111 Gesamtprobetotal sample 7255.67255.6 101.9101.9 21702170 1.401:40 30.430.4 1313

Die untersuchte Probe weist im Mittel einen Stahlfasergehalt von 30.4 kg/m3 Beton auf.The tested sample has on average a steel fiber content of 30.4 kg / m 3 concrete.

BEISPIEL 2EXAMPLE 2

In diesem Fall wurde der gleiche Beton benutzt, wobei jedoch 40 kg/m3 Stahlfasern verwendet wurden. Der gebrauchsfertige Spritzbeton hatte ein Konsistenzmass von 54.0 cm bestimmt nach: Ausbreitmass (nach DIN 1048), ein Nassraumgewicht verdichtet von 2398 kg/m3, ein LP-Gehalt von 1.7 % sowie einen WZ-Wert: 0.50.In this case, the same concrete was used, but using 40 kg / m 3 steel fibers. The ready-to-use shotcrete had a consistency of 54.0 cm determined by: Slump (according to DIN 1048), a wet chamber weight of 2398 kg / m 3 , an LP content of 1.7% and a TM value: 0.50.

Jeweils vier Prüfkörper in Form von Bohrkernen mit einem Durchmesser von 100mm wurden getestet.Four test pieces in the form of cores with a diameter of 100mm were tested.

Untersuchungsergebnisse:Findings:

PrüfkörperbezeichnungPrüfkörperbezeichnung Massenmasses Rohdichte P110 [kg/m3]Bulk density P 110 [kg / m 3 ] MFa/M110 [%]M Fa / M 110 [%] Fasergehaltfiber content M110[g]M 110 [g] MFa[g]M Fa [g] kg/m3 Betonkg / m 3 concrete Verlust [%]Loss [%] 8825 / 18825/1 1828.01828.0 34.534.5 20892089 1.891.89 39.439.4 22 8825 / 28825/2 1800.71800.7 29.929.9 20602060 1.661.66 34.234.2 1515 8825/38825/3 1832.61832.6 32.732.7 21112111 1.781.78 37.637.6 66 8825 / 48825/4 1854.01854.0 32.032.0 21292129 1.731.73 36.836.8 66 Gesamtprobetotal sample 7315.37315.3 129.1129.1 20972097 1.761.76 37.037.0 88th

Die untersuchte Probe weist im Mittel einen Stahlfasergehalt von 37.0 kg/m3 Beton auf.The tested sample has an average steel fiber content of 37.0 kg / m 3 concrete.

BEISPIEL 3EXAMPLE 3

Unter den gleichen Bedingungen wie im Beispiel 2, wurde eine bekannte Faser vom Typ FE 0730 (40 kg/m3) der Anmelderein getestet. Diese Faser sind im wesentlichen gerade und weisen zwei abgeflachte Enden auf.Under the same conditions as in Example 2, a known FE 0730 fiber (40 kg / m 3) of the applicant was tested. This fiber is substantially straight and has two flattened ends.

Die untersuchte Probe weist im Mittel einen Stahlfasergehalt von 29.5 kg/m3 Beton auf d.h. einen Verlust von 26 %.The tested sample has on average a steel fiber content of 29.5 kg / m 3 concrete ie a loss of 26%.

BEISPIEL 4EXAMPLE 4

Unter sehr ähnliche Bedingungen wie im Beispiel 2 und 3 wurden Fasern vom Typ HE 07/30 der Anmelderein getestet (40kg/m3). Diese Fasern weisen ein Mittelstück, zwei mit dem Mittelstück verbundene, abgeknickte Zwischenstücke und jeweils ein mit dem Zwischenstück verbundenes Endstück auf, wobei das Endstück gegenüber dem Zwischenstück derart abgeknickt ist, dass das Endstück im wesentlichen parallel zu dem Mittelstück ist. Das Endstück ist jedoch rund und, im Gegensatz zu der erfindungsgemäßen Faser, nicht abgeflacht.Under very similar conditions as in examples 2 and 3, fibers of the type HE 07/30 of the applicant were tested (40 kg / m3). These fibers comprise a central piece, two intermediate pieces connected to the middle piece and one end piece each connected to the intermediate piece, the end piece being bent relative to the intermediate piece such that the end piece is substantially parallel to the middle piece. However, the tail is round and, unlike the fiber of the invention, not flattened.

Die untersuchte Probe weist im Mittel einen Stahlfasergehalt von 25.7 kg/m3 Beton auf d.h. einen Verlust von 36 %.The tested sample has on average a steel fiber content of 25.7 kg / m 3 of concrete ie a loss of 36%.

Claims (8)

  1. Metal wire fibre for use in reinforcing formable materials, particularly concrete, which comprises a central section, two bent intermediate sections connected to the central section, and an end section connected to each intermediate section, the end section being bent with respect to the intermediate section in such a way that the end section is substantially parallel to the central section, and the central section and the intermediate section having a circular cross section, characterized in that the end section is partially or completely flattened
  2. Wire fibre according to Claim 1, characterized in that the end sections and the central section lie in one plane
  3. Wire fibre according to Claim 1 or 2, characterized in that the intermediate sections are bent in one direction
  4. Wire fibre according to one of the preceding claims, characterized in that the wire fibre has a length of about 10 to 70 mm and a maximum diameter of up to about 1.3 mm
  5. Wire fibre according to one of the preceding claims, characterized in that the intermediate section and the end section have a combined length of 5 to 20 times the diameter of the wire fibre
  6. Wire fibre according to one of the preceding claims, characterized in that the end section has a length (I, I') of 2 to 10 times the diameter of the wire fibre.
  7. Wire fibre according to one of the preceding claims, characterized in that the flattened end section has a width (B) of 1.5 to 3.5 times the diameter of the wire fibre.
  8. Wire fibre according to one of the preceding claims, characterized in that the intermediate section has a height (h, h') of 2 to 10 times the diameter of the wire fibre
EP01947278A 2000-05-17 2001-05-14 Steel fibers Revoked EP1282751B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU90584 2000-05-17
LU90584A LU90584B1 (en) 2000-05-17 2000-05-17 Wire fiber
PCT/EP2001/005456 WO2001088301A1 (en) 2000-05-17 2001-05-14 Steel fibers

Publications (2)

Publication Number Publication Date
EP1282751A1 EP1282751A1 (en) 2003-02-12
EP1282751B1 true EP1282751B1 (en) 2006-09-27

Family

ID=19731904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01947278A Revoked EP1282751B1 (en) 2000-05-17 2001-05-14 Steel fibers

Country Status (9)

Country Link
EP (1) EP1282751B1 (en)
AT (1) ATE340903T1 (en)
AU (1) AU2001269008A1 (en)
DE (1) DE50111098D1 (en)
DK (1) DK1282751T3 (en)
ES (1) ES2272492T3 (en)
LU (1) LU90584B1 (en)
PT (1) PT1282751E (en)
WO (1) WO2001088301A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2440717A1 (en) 2009-06-12 2012-04-18 NV Bekaert SA High elongation fibres
US8962150B2 (en) 2010-12-15 2015-02-24 Nv Bekaert Sa Steel fibre for reinforcing concrete or mortar having an anchorage end with at least two bent sections
US9045901B2 (en) 2009-06-12 2015-06-02 Nv Bekaert Sa High elongation fibre with good anchorage
US9435122B2 (en) 2010-12-15 2016-09-06 Nv Bekaert Sa Steel fibre for reinforcing concrete or mortar having an anchorage end with at least three straight sections

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103261543B (en) 2010-12-15 2016-08-17 贝卡尔特公司 For Concrete Structure or the steel fibre with flat part of mortar
DE202023100215U1 (en) 2023-01-17 2023-02-06 Cbg Composites Gmbh Fiber concrete product based on basalt fibers with a plasticizing effect
DE202023103900U1 (en) 2023-08-23 2023-08-25 Cbg Composites Gmbh Fiber concrete product reinforced with chopped basalt fibers coated with underlayer graphene

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Publication number Priority date Publication date Assignee Title
US2677955A (en) 1943-02-12 1954-05-11 Constantinesco George Reinforced concrete
US3942955A (en) * 1969-09-12 1976-03-09 N. V. Bekaert S. A. Reinforcing wire element
DE2305651A1 (en) 1973-02-06 1974-08-08 Josef Helmut Danzer Reinforced concrete - contains loose dispersed steel reinforcing pieces
WO1984002732A1 (en) 1982-12-30 1984-07-19 Eurosteel Sa Filiform elements usable for reinforcing mouldable materials, particularly concrete
DE8815120U1 (en) 1988-12-05 1989-03-30 Fa. Hermann Gloerfeld, 5860 Iserlohn, De
DE9006524U1 (en) 1990-06-09 1990-08-09 Hermann Gloerfeld Gmbh & Co Kg, 5860 Iserlohn, De
BE1009638A3 (en) * 1995-09-19 1997-06-03 Bekaert Sa Nv STEEL WIRE ELEMENT FOR MIXING IN POST-CURING MATERIALS.
FR2832262A1 (en) 2001-11-09 2003-05-16 France Telecom METHOD AND DEVICE FOR SUPPLYING ELECTRICAL ENERGY TO AN APPARATUS

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2440717A1 (en) 2009-06-12 2012-04-18 NV Bekaert SA High elongation fibres
US8871020B2 (en) 2009-06-12 2014-10-28 Nv Bekaert Sa High elongation fibres
US9045901B2 (en) 2009-06-12 2015-06-02 Nv Bekaert Sa High elongation fibre with good anchorage
US8962150B2 (en) 2010-12-15 2015-02-24 Nv Bekaert Sa Steel fibre for reinforcing concrete or mortar having an anchorage end with at least two bent sections
US9435122B2 (en) 2010-12-15 2016-09-06 Nv Bekaert Sa Steel fibre for reinforcing concrete or mortar having an anchorage end with at least three straight sections

Also Published As

Publication number Publication date
EP1282751A1 (en) 2003-02-12
PT1282751E (en) 2007-01-31
ATE340903T1 (en) 2006-10-15
ES2272492T3 (en) 2007-05-01
DK1282751T3 (en) 2007-02-05
DE50111098D1 (en) 2006-11-09
AU2001269008A1 (en) 2001-11-26
LU90584B1 (en) 2001-11-19
WO2001088301A1 (en) 2001-11-22

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