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WO2017184090A1 - Matériau de renfort de béton macroscopique synthétique et procédé de production associé - Google Patents

Matériau de renfort de béton macroscopique synthétique et procédé de production associé Download PDF

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Publication number
WO2017184090A1
WO2017184090A1 PCT/TR2016/050119 TR2016050119W WO2017184090A1 WO 2017184090 A1 WO2017184090 A1 WO 2017184090A1 TR 2016050119 W TR2016050119 W TR 2016050119W WO 2017184090 A1 WO2017184090 A1 WO 2017184090A1
Authority
WO
WIPO (PCT)
Prior art keywords
tpm
twisting
fibers
twisted yarns
reinforcement material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/TR2016/050119
Other languages
English (en)
Inventor
Erhan KOP
Emine GÜVEN
Nurcin Javaherian
Gökce DEMIRCIOGLU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kordsa Teknik Tekstil AS
Original Assignee
Kordsa Teknik Tekstil AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kordsa Teknik Tekstil AS filed Critical Kordsa Teknik Tekstil AS
Priority to PCT/TR2016/050119 priority Critical patent/WO2017184090A1/fr
Priority to PCT/EP2016/082937 priority patent/WO2017182112A1/fr
Publication of WO2017184090A1 publication Critical patent/WO2017184090A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04—Macromolecular compounds
    • C04B16/06—Macromolecular compounds fibrous
    • C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B16/0691—Polyamides; Polyaramides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0077—Packaging material remaining in the mixture after the mixing step, e.g. soluble bags containing active ingredients
    • 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
    • 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
    • E04C5/076—Specially adapted packagings therefor, e.g. for dosing

Definitions

  • the present invention relates to a macro synthetic concrete reinforcement material and production method thereof.
  • Concrete is generally known as a brittle material with low tensile strength values
  • several reinforcement materials in fibrous form are employed and to overcome this issue, along with enhancing its strength after an initial crack and improving its ductility.
  • fiber-based reinforcement materials are introduced to cement mixtures.
  • Polymeric macro synthetical reinforcement materials are known to be used for provision of resistance to load bearing concrete matrices for e.g. at ground or floor applications, prefabricated structures such as concrete pipes, tunnels and retaining walls, further including ex-proof and impact resistant panel structures.
  • Such reinforcement materials are named structural reinforcement materials targeting provision of load bearing ability to concrete upon first crack (i.e. secondary reinforcement).
  • Polyolephinic fibers including polypropylene, polyethylene, polypropylene/ propylene copolymer, and polyvinyl alcohol are known to be used in macro synthetical concrete reinforcement materials. Carbon and basalt based fibers are also used in some applications. Macro synthetical fiber based reinforcement materials in market of in ground applications are usually in form of monofilaments or fibrilized filaments twisted from strips. Polyester fibers are known to have low alkaline resistance.
  • Polypropylene and polyethylene fiber based reinforcement materials as described in WO 2012 / 174414 A2 are widely used in cement preparation. Yet, these materials float in cement mixtures and thus can't get homogeneously distributed in concrete matrix. Additionally, chemical and mechanical adhesion abilities, stiffness and tensile strength of these materials are generally unfavorable.
  • EP 0 179 551, US 2001/051 266 Al, US 2002/0 182 406 Al and US 2002/0 182 406 Al describe efforts for improving dispersion ability and compatibility of fiber-based reinforcement materials in matrices.
  • Main problems in fiber-based macro synthetical reinforcement materials for cement mixtures include lack of stiffness, balling in cement mixture due to poor dispersion, inadequate compatibility with concrete matrix such as lack of physical and chemical adhesion resulting in low pullout strength, low tensile strength in reinforcement material, causing low load-carrying ability upon crack formation in concrete; stripping out from the concrete matrix in case of crack formation.
  • Primary object of the present invention is to eliminate the above-mentioned shortcomings in the prior art.
  • a further object of the present invention is to provide a macro synthetical fiber based reinforcement material for concrete, which has favorable mixing behavior when introduced into cement, and favorable reinforcing behavior in concrete matrix.
  • a further object of the present invention is to provide a method for obtention of such reinforcement material.
  • the present invention proposes a macro synthetical fiber based reinforcement material for concrete, in form of twisted yarns comprising six or more fibers, at least one third of said fibers comprising polyamide 6 or polyamide 6.6.
  • the present invention further proposes a method for obtention of such reinforcement material.
  • Figure 1 represents an exemplary twisted yarn according to the present invention.
  • Figure 2 shows deflexion test result of concrete reinforced with Polyamid 6,6 macro synthetic fiber according to the present invention, compared with concrete reinforced with polypropylene fiber.
  • FIG. 3 (a), (b) and (c) respectively, schematically depict three sequential steps of the preferred method according to the present invention, wherein cord is obtained by fiber twisting.
  • the present invention proposes a macro synthetical fiber based concrete reinforcement material, and a method for obtention thereof.
  • the reinforcement material is a cord (10) preferably in form of twisted yarns, said twisted yarns comprise six or more fibers (1).
  • the reinforcement material is made by twisting six fibers (1), and at least one third (w/w) of the fibers (1), more preferably at least two third (w/w), even more preferably all of the fibers (1) comprise polyamide 6 or polyamide 6.6.
  • At least two of said fibers (1) are polyamide based (PA 6 and/or PA 66) fibers coated according to the present invention for obtention high surface compatibility and adhesion with a concrete matrix.
  • the number of the polyamide based fibers (1) in the twisted yarn of the reinforcement material can be determined. For instance, in an exemplary case where the twisted yarn includes PP and PA fibers, the higher number of PA fibers correspond to a higher reinforcement material density, and a higher pullout strength which is attributed to higher surface polarity and adhesion ability between the reinforcement material and concrete.
  • the density of the reinforcement material preferably ranges preferably between 0.9 g/cm 3 and 1.16 g/cm 3 , and the reinforcement material has a high compatibility when mixed with concrete. Presence of lower density fibers in the twisted yarn, results in lower reinforcement material density values.
  • density of the reinforcement material can be determined by arranging the number of polyamide based fibers and the number of other polymeric fibers with known densities.
  • the linear density of the fibers (1) range between 1400 and 4200 dtex, wherein the unit dtex is an abbreviation for decitex, which is the mass of filaments in grams per 10,000 meters.
  • the present invention further proposes a method for obtention of twisted macro synthetical fiber-based concrete reinforcement material (cord), said method comprising steps exemplified below.
  • the twisting is preferably performed according to an unbalanced twisting method comprising the following sequential steps, wherein Z-direction and S-direction are opposite twisting directions well known to a skilled person in the art of spinning of yarns:
  • the method comprises the following sequential steps:
  • the twisted reinforcement material can be considered and named as a cord.
  • Cord obtained according to the above method preferably has:
  • L/D - aspect (L/D) ratio lower than a value ranging between 70 and 85.
  • Greater aspect ratios increase the tendency of balling in cement mixtures and hairy appearance at concrete surface, especially with lower stiffness reinforcement materials in the prior art.
  • the cord is then preferably subjected to thermal treatment preferably including coating, drying, and orientation.
  • the coating step is performed by dipping the cord into an aqueous dip solution preferably comprising suitable reactives known to skilled person in the art for obtention of a coating layer comprising one or more material selected from a list consisting of polyurethane-, epoxy-, polyacrylate-, silane-, polyamide-, resorcinol-, and formaldehyde-based materials.
  • reinforcing material (cord) obtained by said method is coated with a coating layer comprising one or more material selected from a list consisting of polyurethane-, epoxy-, polyacrylate-, silane-, polyamide-, resorcinol-, and formaldehyde-based substances.
  • the thermal treatment i.e. heat setting to obtain favorable values for modulus, elongation and thermal shrinkage
  • the above-mentioned temperature ranges give highly favorable results in case where at least two third (w/w) of the fibers comprise polyamide 6 or 6.6; and best results are obtained when all of the fibers comprise polyamide 6 or 6.6.
  • Highest value of the tension applied onto the cord is preferably within a range between 0.1 g/dtex and 1.5 g/dtex, and more preferably between 0.4 g/dtex and 1.2 g/dtex.
  • Suitable exposure time in thermal treatment depends on an oven length used in finishing, linear velocity of the reinforcement material at passing through the oven, and number of oven passings.
  • Optimal exposure time i.e. total duration of thermal treatment is within a range between 10 seconds and 120 seconds.
  • the above-mentioned exposure time range give highly favorable results in case where at least two third (w/w) of the fibers comprise polyamide 6 or 6.6; and best results are obtained when all of the fibers comprise polyamide 6 or 6.6.
  • Average linear density of filaments used in the cord according to the present invention preferably ranges between 4 den and 15 den (abbreviation for 'denier 7 ).
  • the cord disperses well in concrete, within a range between 2800 dtex and 25200 dtex.
  • the coating provides minimized lump formation tendency in the reinforced concrete and furthermore, high chemical adhesion between the cord and concrete, due to polarity compatibility and/or covalent bonding between coating and concrete. Pullout strength of the cord from concrete is thus maximized.
  • the cord according to the present invention is preferably bundled and wrapped with water soluble polyvinyl acetate (PVA) sheathes, for facilitated introduction in form of dissolvable packs into cement mixtures.
  • PVA sheath which is preferably of a thickness within the range between 50 micrometers and 35 micrometers, is easily dissolvable in the cement mixture, and thus a uniform distribution of concrete cord can be obtained.
  • PVA-wrapped reinforcing material bundles are introduced into cement mixtures in transmixers, in paper-based packagings (e.g. paper bags).
  • the paper packaging disintegrates and then the water-soluble PVA wrapping dissolves in aqueous cement mixture, thus the cord gets in direct contact with the cement mixture, and disperses homogeneously therein.
  • Polyamide 6.6 (PA 66) and polyamide 6 (PA 6) have a density of 1,14 g/cm 3 , which is higher than the most widely used synthetic concrete reinforcement material polypropylene (PP, density: 0.91 g/cm 3 ).
  • polyamide-based (PA-based) concrete reinforcement fibers occupy lower volume (corresponding to a lower volumetric ratio and regarding this, a decreased aggregation) in concrete, with respect to polypropylene-based (PP-based) fibers.
  • This allows introduction of higher weight ratios of reinforcement material in case of poliamide-based fibers, in comparison with the case where the fibers mainly consist of PP.
  • PA fibers do not float in aqueous media, thanks to the higher density thereof.
  • PA-based fibers provide enhanced fracture toughness to concrete, in comparison with the above mentioned polyolephinic alternatives widely used in the market.
  • the load carried by the concrete reinforced by PA-based fiber according to the present invention increases with increasing crack opening, in a 4-point bending test performed in accordance with ASTM C 1609.
  • PA-66 fibers according to the present invention fulfill this performance criterion better than polyolephinic fibers.
  • tensile strength of e.g. PA 66-based fibers is within the range of 700-950 MPa, corresponding to higher values in comparison with that of PP-based fibers, ranging between 500 and 700 MPa.
  • Post-crack strength of concrete matrix depends to the type of reinforcing (fiber) material, its elastic modulus, aspect ratio, tensile strength, fiber surface properties, amount of fiber, fiber orientation and aggregate size.
  • the cord according to the present invention provides a favourable pro-crack strength (i.e. post-crack load carrying capacity) to the concrete.
  • pro-crack strength i.e. post-crack load carrying capacity
  • the load is transferred onto the fibers of the cord, and the fibers stretch in accordance with increasing crack opening (distance between two sides of crack).
  • the surface compatibility of the cord with concrete is high, due to its shape with increased surface area with indentations obtained by twisting, and surface coating providing strong adhesion to concrete, the cord does not easily quit concrete matrix, which corresponds to favorable pullout strength.
  • the cord successfully shows increasing resistance against widening of crack opening.
  • reinforced concrete with higher ductility and toughness becomes available with the cord according to the present invention.
  • the cord according to the present invention has a higher toughness when compared to commercial polymer-based macro synthetical reinforcement materials on the market, by having a pullout strength ranging between 900 and 1040 MPa. It has a low denier per filament (dpf) value within a range between 4 dpf to 15 dpf. Moisture holding capacity of the cord according to the present invention ranges between 3% and 4% (w/w), which corresponds to easy and favorable interface formation in concrete mixtures at curing thereof.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Wrappers (AREA)
  • Packages (AREA)

Abstract

La présente invention concerne un matériau de renfort à base de fibres macroscopiques synthétiques pour béton, sous la forme de fils torsadés comprenant six fibres ou plus, au moins un tiers desdites fibres comprenant du polyamide 6 ou du polyamide 6.6. La présente invention concerne en outre un procédé d'obtention d'un tel matériau de renfort.
PCT/TR2016/050119 2016-04-20 2016-04-20 Matériau de renfort de béton macroscopique synthétique et procédé de production associé Ceased WO2017184090A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/TR2016/050119 WO2017184090A1 (fr) 2016-04-20 2016-04-20 Matériau de renfort de béton macroscopique synthétique et procédé de production associé
PCT/EP2016/082937 WO2017182112A1 (fr) 2016-04-20 2016-12-30 Procédé de préparation d'un matériau de renfort

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2016/050119 WO2017184090A1 (fr) 2016-04-20 2016-04-20 Matériau de renfort de béton macroscopique synthétique et procédé de production associé

Publications (1)

Publication Number Publication Date
WO2017184090A1 true WO2017184090A1 (fr) 2017-10-26

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PCT/TR2016/050119 Ceased WO2017184090A1 (fr) 2016-04-20 2016-04-20 Matériau de renfort de béton macroscopique synthétique et procédé de production associé
PCT/EP2016/082937 Ceased WO2017182112A1 (fr) 2016-04-20 2016-12-30 Procédé de préparation d'un matériau de renfort

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PCT/EP2016/082937 Ceased WO2017182112A1 (fr) 2016-04-20 2016-12-30 Procédé de préparation d'un matériau de renfort

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020005183A3 (fr) * 2018-06-25 2020-02-13 Kordsa Teknik Tekstil A.S. Élément de renfort de béton

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368343A (en) * 1964-05-28 1968-02-13 English Sewing Cotton Company Sewing thread
EP0179551A2 (fr) 1984-08-17 1986-04-30 E.I. Du Pont De Nemours And Company Renforcement de béton
US20010051266A1 (en) 1999-10-08 2001-12-13 W.R. Grace & Co.-Conn. Fibers for reinforcing matrix materials
US20020182406A1 (en) 2001-04-25 2002-12-05 Klaus-Alexander Rieder Highly dispersible reinforcing polymeric fibers
US20050241534A1 (en) * 2004-04-30 2005-11-03 The Regents Of The University Of Michigan Process for increasing the ductility of high performance fiber-reinforced brittle matrix composites, and composites produced thereby
WO2009022488A1 (fr) * 2007-08-15 2009-02-19 Shinsuke Tsubakihara Objet durci renforcé et son procédé de fabrication
WO2012174414A2 (fr) 2011-06-16 2012-12-20 Pro Perma Engineered Coatings, Llc Béton renforcé de fibres

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133928A (en) * 1972-03-22 1979-01-09 The Governing Council Of The University Of Toronto Fiber reinforcing composites comprising portland cement having embedded therein precombined absorbent and reinforcing fibers
US6039086A (en) * 1997-10-02 2000-03-21 Lindauer Dornier Gesellschaft Mbh Separating weft thread waste of a single uncontaminated material from untwisted leno binding threads in trimmed catch selvages
EP1960191A2 (fr) * 2005-12-16 2008-08-27 Polymer Group, Inc. Materiau fibreux pour beton, structure refractaire le comprenant et procedes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368343A (en) * 1964-05-28 1968-02-13 English Sewing Cotton Company Sewing thread
EP0179551A2 (fr) 1984-08-17 1986-04-30 E.I. Du Pont De Nemours And Company Renforcement de béton
US20010051266A1 (en) 1999-10-08 2001-12-13 W.R. Grace & Co.-Conn. Fibers for reinforcing matrix materials
US20020182406A1 (en) 2001-04-25 2002-12-05 Klaus-Alexander Rieder Highly dispersible reinforcing polymeric fibers
US20050241534A1 (en) * 2004-04-30 2005-11-03 The Regents Of The University Of Michigan Process for increasing the ductility of high performance fiber-reinforced brittle matrix composites, and composites produced thereby
WO2009022488A1 (fr) * 2007-08-15 2009-02-19 Shinsuke Tsubakihara Objet durci renforcé et son procédé de fabrication
WO2012174414A2 (fr) 2011-06-16 2012-12-20 Pro Perma Engineered Coatings, Llc Béton renforcé de fibres

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020005183A3 (fr) * 2018-06-25 2020-02-13 Kordsa Teknik Tekstil A.S. Élément de renfort de béton

Also Published As

Publication number Publication date
WO2017182112A1 (fr) 2017-10-26

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