JP4645930B2 - Partially fused concrete reinforcing fiber, method for producing the same, and fiber reinforced concrete product - Google Patents
Partially fused concrete reinforcing fiber, method for producing the same, and fiber reinforced concrete product Download PDFInfo
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- JP4645930B2 JP4645930B2 JP2000363559A JP2000363559A JP4645930B2 JP 4645930 B2 JP4645930 B2 JP 4645930B2 JP 2000363559 A JP2000363559 A JP 2000363559A JP 2000363559 A JP2000363559 A JP 2000363559A JP 4645930 B2 JP4645930 B2 JP 4645930B2
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- 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
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- Organic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、一般コンクリート、トンネルの吹付けコンクリート、法面コンクリートや道路舗装コンクリート等の補強用として混練性、圧送性等の施工性に優れかつ補強効果に優れたコンクリート補強用繊維および高いタフネスを有し、耐衝撃性さらには耐久性に優れた高性能繊維補強コンクリート製品に関する。
【０００２】
【従来の技術】
近年鉄道トンネル壁面や橋梁から外壁の剥離落下事故が発生し高い耐ひび割れ性、タフネスを有し、耐衝撃性に優れさらに長期耐久性に優れた繊維補強コンクリート製品が求められている。しかしながら、粗骨材の混入した一般的なコンクリート、トンネルの吹付けコンクリートや法面コンクリートに繊維径の細いマルチフィラメントを混練することは非常に困難であった。そこで、繊維径の太いモノフィラメント、マルチフィラメントを樹脂等で収束した繊維や、異形断面をもつ鋼繊維等がもちいられている。しかし、マルチフィラメントを収束すると表面積が減少することによりセメントマトリックスとの付着が減少し性能が低くなるという問題があった。鋼繊維は重量が重く錆の発生やセメント製品の表面平滑性等の問題があった。また、鋼繊維をもちいる吹付けコンクリートでははね返りといった問題があった。このため軽量で混練性、施工性が良く高性能なコンクリート補強用繊維が求められていた。一方、高強度・高弾性率ポリエチレン繊維はセメントアルカリ性に対する化学安定性が高く、耐候性にも優れているためモルタル製品ではマルチフィラメントのカットファイバーを用いて高靭性な繊維補強コンクリート製品が開発されている。しかし、粗骨材の混入した一般コンクリートの場合カット長は粗骨材径より長くする必要がある。カット長の長いマルチフィラメントを混練するために水結合材比を高くし、流動性の高い高炉スラグ微粉末を混入した繊維補強コンクリートが開発されている。しかし、この場合も混練性は必ずしも充分ではなく糸がらみのため圧送性が低といった問題があった。従って、マルチフィラメントとマトリックスとの接着面積を減少させることがなく、かつ、ある程度収束させ混練性、圧送性の良好なワーカビリティーの高いコンクリート補強繊維を開発する必要があった。汎用のポリプロピレン樹脂の表面に凹凸を付けたロットやポリプロピレンをネット状に加工した繊維も開発されているが、汎用ポリプロピレン繊維の強度は低く、高性能なコンクリート製品は製造できず、一般的にコンクリートのひび割れ防止に使用されている。セメントマトリックスとの接着性が良く繊維径の太いビニロン繊維もコンクリート補強用繊維としてもちられているが強度・弾性率が十分ではなくコンクリートの弾性率が低くなる傾向がある。また、高強度コンクリートでは繊維の破断により高靭性が得られないといった問題点があった。従って、高性能なコンクリート製品を製造するためには高強度・高弾性率繊維を用いたコンクリート補強繊維を開発する必要があった。特に、耐久性に優れた高性能コンクリート製品を製造するためはアルカリ耐性、耐候性に優れた高強度・高弾性率ポリエチレン繊維を用いたコンクリート製品の開発が求められていた。
【０００３】
【発明が解決しようとする課題】
かかる問題点を解消するためには繊維径の細い高強度マルチフィラメントを部分的に融着させある程度収束させることにより混練性を高めると同時に、セメントマトリックスとの付着性能を高めるため各単繊維はセメントマトリックスと出来るだけ接着させる必要がある。従って、高強度・高弾性マルチフィラメントを簡便に部分的に融着させ混練性、圧送性に優れたコンクリート補強用繊維および高性能な繊維補強コンクリート製品を提供することが本発明の課題である。
【０００４】
【課題を解決するための手段】
即ち本発明は、引張り強度１０ｃＮ／ｄｔｅｘ以上、弾性率が４００ｃＮ／ｄｔｅｘ以上の高強度・高弾性率マルチフィラメント繊維が部分的に融着されてなることを特徴とするコンクリート補強用繊維であり、具体的には高強度・高弾性率マルチフィラメント繊維の単繊維径が５〜５０μであることを特徴とする上記記載のコンクリート補強用繊維、総繊度が１００ｄｔｅｘ〜６，０００ｄｔｅｘであることを特徴とする上記記載のコンクリート補強用繊維、高強度・高弾性率マルチフィラメント繊維にカバリングされた低融点繊維が熱接着することにより部分的に熱融着されてなることを特徴とする上記記載のコンクリート補強用繊維、低融点繊維がポリエチレン繊維であることを特徴とする上記記載のコンクリート補強用繊維である。
また本発明は、引張り強度１０ｃＮ／ｄｔｅｘ以上、弾性率が４００ｃＮ／ｄｔｅｘ以上の高強度・高弾性率マルチフィラメント繊維に低融点繊維でカバリングし、次いで加熱処理を施すことを特徴とするコンクリート補強用繊維の製造方法であり、具体的にはカバリング数が３０〜９００Ｔ／ｍであることを特徴とする上記記載のコンクリート補強用繊維の製造方法である。
更に本発明は、上記記載のコンクリート補強用繊維を強化材としてなることを特徴とする繊維補強コンクリート製品である。
以下、本発明を詳述する。
【０００５】
本発明の高性能繊維補強用繊維において好適に用いることのできる高強力・高弾性率繊維としては、高い繊維補強効果を出すためには高強度・高弾性率繊維の引張り強度が少なくとも１０ｃN／ｄTex以上、弾性率が４００ｃN／ｄTex以上であることを特徴とする高靭性繊維補強セメント製品である。さらに、引張り強度１５ｃN/ｄTex以上、弾性率が５００ｃN／ｄTex以上であることが好ましい。各々１０ｃN／ｄTex、４００ｃN/ｄTex以下では補強効果があまり認められない。
【０００６】
さらに、本発明に用いる補強用繊維は混練で単繊維間の繊維のからみを防ぐために融着繊維をカバーリングし部分的に融着させることを特徴とする繊維である。従って、本発明に用いる繊維はある程度収束しているため繊維束としてはセメントマトリックスに均一に分散する。その一方で、各単繊維はセメントマトリックスと接着することができるためセメントマトリックスとの付着表面積は大きく付着強度は強い。また、高強度・高弾性率繊維を直線に配列しその周囲を融着繊維でカバーリングするため高強度・高弾性率繊維の性能を最大限発揮させることができる。
【０００７】
本発明の高靭性繊維補強コンクリート製品において好適に用いることのできる高強力・高弾性率繊維としては、超高分子量のポリオレフィン繊維が挙げられる。ポリオレフィンとしてはポリエチレンやポリプロピレンが一般的であるが特に規定される物ではない。さらに好ましくは強度・弾性率が高い超高分子量ポリエチレンが好ましい。また、本発明に用いられる超高分子量のポリエチレン繊維はセメントアルカリ性下でも非常に安定であり、耐光性にも優れるため本発明の繊維補強セメント製品は耐久性に優れる。さらに、融着繊維として好適に用いることができる繊維については部分的に融着できるものであれば特に制限するものではないが、耐久性を考慮すると耐候性に優れたポリオレフィンが好ましく、芯鞘構造のうち少なくとも外側の鞘部は低融点ポリオレフィン樹脂であることがのぞましい。さらに、好ましくは芯部がポリプロプレン樹脂からなり鞘部が低融点ポリエチレンからなる熱接着複合繊維を使用すると熱ローラー等の熱処理により簡単に熱融着することができ、繊維束に適度な剛性を付与することができる。
【０００８】
また、本発明にもちいるコンクリート補強用繊維はその総繊度１００ｄｔｅｘ〜６，０００ｄｔｅｘであるのが好ましい。さらに、好ましくは４００〜４，０００ｄｔｅｘである。総繊度を少なくすると単位体積当たりの投入本数を増やすことができるが補強用繊維の生産性が悪くコスト的には総繊維が太いほど低コストで製造できる。一方、あまり繊維束が太くなるとその繊維束がセメントマトリックスの欠陥部位となり繊維補強コンクリートの性能が低下する。
【０００９】
さらに、本発明の融着繊維のカバーリング数は３０〜９００Ｔ／ｍであることが好ましくさらに好ましくは４０〜２００Ｔ／ｍである。撚角度（芯糸の糸長方向とカバリング糸との角度）は５〜４０°、好ましくは１０〜３０°、更に好ましくは１０〜２４°である。また、粗骨材混入コンクリートを補強するためにはコンクリート補強用繊維のカット長は粗骨材の径より長い必要がある。繊維束を収束させるためには少なくとも１Ｔ／カット長以上カバーリングする必要がある。一方、カバーリング数を増加させると繊維束の収束性は高まり混練性は向上するが、あまり多くなると単繊維とセメントマトリックスとの付着が低下し繊維補強コンクリート製品の性能が低下する。従って、カバーリング数を適切に選択することにより最適な混練性と補強効果をもつコンクリート補強用繊維を得ることができる。
【００１０】
本発明でもちいるコンクリート補強用繊維の単繊維径は５〜５０μであることが好ましく、さらに好ましくは１０〜４０μである。単繊維の径が太くなると各単繊維とセメントマトリックスとの付着面積が少なくなり繊維束の付着力が低下する。単繊維径が小さくなると繊維束の剛性が低下する等のため混練性は逆に低下する。
【００１１】
【実施例】
（実施例１〜４、比較例１，２）
以下に本発明に用いた繊維の製造法を記載する。
高強度・高弾性率ポリエチレン繊維（２６４０、１７６０および４４０ｄｔｅｘ）を芯糸に芯部がポリプロプレン鞘部が低融点ポリエチレンからなる熱接着性複合繊維（７６０ および１９０ｄｔｅｘ）を巻糸としてカバーリング（撚条件：４７Ｔ／ｍｍ、撚方向：Z）した。比較例２の場合はカバーリング数１０００Ｔ／ｍとした。さらに接着熱ローラー（約１２０℃）および非接着熱ヒーター（約１２０℃）で加熱部分融着した。融着繊維はカット長３０ｍｍにカットして使用した。
【００１２】
以下に本発明にもちいるコンクリート補強用繊維の強度・弾性率に関する測定法および測定条件を説明する。
本発明に用いるコンクリート補強用繊維の強度，弾性率は、オリエンティック社製「テンシロン」を用い、試料長２００ｍｍ（チャック間長さ）、伸長速度１００％／分の条件で歪ー応力曲線を雰囲気温度２０℃、相対湿度６５％条件下で測定し、曲線の破断点での応力を強度（ｃＮ／ｄｔｅｘ）、曲線の原点付近の最大勾配を与える接線より弾性率（ｃＮ／ｄｔｅｘ）を計算して求めた。なお、各値は５回の測定値の平均値を使用した。
得られた繊維の物性値を表１に示す。
【００１３】
【表１】
本発明で用いた実験方法を以下に示す。
表２に使用材料の一覧を示す。セメントには早強ポルトランドセメント、混和材として高炉スラグ微粉末を用いた。
【００１５】
調合：表３に使用調合を示す。すべての調合について、コンクリート補強繊維としてはカット長３０ｍｍの繊維を用い、繊維体積率Ｖｆ＝１．０％一定とした。
【００１６】
【表２】
【表３】
混練：容量５５ｌの強制２軸ミキサーを使用した。混練手順は、セメント、高炉スラグ、砂、砕石を１５秒間空練後、水、高性能ＡＥ減水剤を加え、３０秒間混練後、繊維を投入しながら３分間練り混ぜた。供試体の締め固めには高周波バイブレーターを使用した。
【００１９】
試験方法：スランプ試験はＪＩＳ Ａ１１０１に準拠して行なった。圧縮試験はＪＩＳＡ１１０８法に準拠し、φ１００×２００ｍｍ円柱供試体を用い、圧縮応力−ひずみ曲線を測定した。曲げ試験は ＪＩＳ Ａ１１０６に準拠し、１００×１００×４００ｍｍの角柱供体を用い、中央３点曲げ載荷（スパン長３００ｍｍ）により過重−載荷点変位曲線を測定した。なお、供試体は各３個ずつ作製し、標準養生材齢１４日後試験を行なった。また、ヤング係数は１／３割線弾性係数、曲げタフネスはＪＣＩ基準に準拠し、基準変位２ｍｍまでの荷重−変位曲線下の面積として求めた。
【００２０】
比較例１として通常カット品３０ｍｍを使用した。実施例１〜２ではカバーリング糸の太さを変化させ、実施例３〜４では高強度・高弾性率ポリエチレン繊維と融着繊維の重量比を一定とし総繊度を変化させ単位体積当たりの投入本数を変化させた。
【００２１】
比較例２としてカバーリング数を増やし融着糸の表面の全面をカバーリング糸で融着したロット状の融着糸を３０ｍｍにカットして使用した。
【００２２】
【表４】
スランプ値、圧縮および曲げ強度試験結果を表４に示す。スランプ値は収束の程度が高くなるほど大きくなった。比較例に比べ糸がらみも殆どなく圧送や吹付けコンクリートとして使用できる流動性が確認された。特に実施例１および２は極めて混練性、ワーカビリティーに優れている。圧縮強度は比較例より高く、収束性を高めるほど高くなる傾向があった。曲げ強度、曲げタフネスは実施例３が通常繊維と同等、実施例１、２および４が通常繊維より高くなった。特に、総合的には実施例１がワーカビリティー、性能共極めて優れている。また、投入本数の多い実施例４は極めて高い曲げ強度と曲げタフネスを示した。
【００２４】
【発明の効果】
本発明によると、粗骨材が混入された一般コンクリートやその他、トンネル吹付けコンクリート、法面コンクリートおよび道路舗装コンクリート等に好適な混練性、ワーカビリティーに優れたコンクリート補強用繊維と耐久性に優れた高性能繊維補強コンクリート製品を提供することを可能とした。[0001]
BACKGROUND OF THE INVENTION
The present invention provides concrete reinforcing fibers and high toughness that are excellent in workability such as kneading property, pumping property and the like, and excellent in reinforcing effect, for reinforcing general concrete, tunnel shotcrete, slope concrete, road pavement concrete and the like. The present invention relates to a high-performance fiber reinforced concrete product having excellent impact resistance and durability.
[0002]
[Prior art]
In recent years, there has been a demand for fiber reinforced concrete products having high crack resistance and toughness, excellent impact resistance, and excellent long-term durability due to the occurrence of accidental peeling and falling from the walls of railway tunnels and outer walls. However, it has been very difficult to knead multifilaments with small fiber diameters into general concrete mixed with coarse aggregates, tunnel shot concrete and slope concrete. Therefore, monofilaments having a large fiber diameter, fibers obtained by converging multifilaments with a resin, steel fibers having an irregular cross section, and the like are used. However, when the multifilaments are converged, there is a problem in that the surface area decreases and adhesion with the cement matrix decreases, resulting in poor performance. Steel fibers are heavy and have problems such as rust generation and surface smoothness of cement products. In addition, shotcrete using steel fiber has a problem of rebound. For this reason, there has been a demand for lightweight, high-performance concrete reinforcing fibers that are kneadable and workable. On the other hand, high-strength and high-modulus polyethylene fibers have high chemical stability against cement alkali and excellent weather resistance, so in mortar products, high-toughness fiber-reinforced concrete products have been developed using multifilament cut fibers. Yes. However, in the case of general concrete mixed with coarse aggregate, the cut length needs to be longer than the coarse aggregate diameter. In order to knead multifilaments with long cut lengths, fiber reinforced concrete has been developed in which the water binder ratio is increased and blast furnace slag fine powder with high fluidity is mixed. However, in this case as well, the kneadability is not always sufficient, and there is a problem in that the pumpability is low due to yarn binding. Therefore, it was necessary to develop a concrete workable fiber having high workability without reducing the bonding area between the multifilament and the matrix, converging to some extent, and having good kneadability and pumpability. Lots with irregularities on the surface of general-purpose polypropylene resin and fibers made of polypropylene in a net shape have been developed, but general-purpose polypropylene fibers are low in strength and cannot produce high-performance concrete products. Used to prevent cracking. Vinylon fibers with good adhesion to the cement matrix and large fiber diameters are also used as concrete reinforcing fibers, but their strength and elastic modulus are not sufficient and the elastic modulus of concrete tends to be low. In addition, high strength concrete has a problem that high toughness cannot be obtained due to fiber breakage. Therefore, in order to produce high-performance concrete products, it was necessary to develop concrete reinforcing fibers using high-strength and high-modulus fibers. In particular, in order to produce a high-performance concrete product excellent in durability, development of a concrete product using high-strength and high-modulus polyethylene fiber excellent in alkali resistance and weather resistance has been required.
[0003]
[Problems to be solved by the invention]
In order to solve this problem, high-strength multifilaments with small fiber diameters are partially fused and converged to some extent to improve kneadability, and at the same time, each single fiber is cemented to improve its adhesion to the cement matrix. It is necessary to adhere as much as possible to the matrix. Accordingly, it is an object of the present invention to provide a concrete reinforcing fiber and a high-performance fiber-reinforced concrete product that are excellent in kneading property and pumpability by simply partially fusing high-strength and high-elasticity multifilaments.
[0004]
[Means for Solving the Problems]
That is, the present invention is a concrete reinforcing fiber characterized in that a high-strength and high-modulus multifilament fiber having a tensile strength of 10 cN / dtex or more and an elastic modulus of 400 cN / dtex or more is partially fused. Specifically, the fiber for reinforcing concrete as described above, wherein the single filament diameter of the high-strength / high-modulus multifilament fiber is 5 to 50 μm, the total fineness is 100 dtex to 6,000 dtex, The above-described concrete reinforcing fiber, wherein the low-melting fiber covered with the high-strength / high-modulus multifilament fiber is partially heat-sealed by heat bonding. The concrete reinforcing fiber according to the above, wherein the fiber and the low melting point fiber are polyethylene fibers.
Also, the present invention is for concrete reinforcement characterized by covering a high-strength, high-elastic modulus multifilament fiber having a tensile strength of 10 cN / dtex or more and an elastic modulus of 400 cN / dtex or more with a low-melting fiber, followed by heat treatment. It is a manufacturing method of a fiber, specifically, the covering number is 30 to 900 T / m.
Furthermore, the present invention provides a fiber-reinforced concrete product characterized in that the above-described concrete reinforcing fiber is used as a reinforcing material.
The present invention is described in detail below.
[0005]
The high strength and high elastic modulus fiber that can be suitably used in the fiber for reinforcing high performance fibers of the present invention has a tensile strength of at least 10 cN / dTex for producing a high fiber reinforcing effect. As mentioned above, it is a high toughness fiber reinforced cement product characterized by having an elastic modulus of 400 cN / dTex or more. Furthermore, it is preferable that the tensile strength is 15 cN / dTex or more and the elastic modulus is 500 cN / dTex or more. Reinforcing effects are hardly observed at 10 cN / dTex and 400 cN / dTex or less, respectively.
[0006]
Furthermore, the reinforcing fiber used in the present invention is a fiber characterized in that the fused fiber is covered and partially fused in order to prevent entanglement of the fibers between the single fibers by kneading. Accordingly, since the fibers used in the present invention are converged to some extent, the fiber bundle is uniformly dispersed in the cement matrix. On the other hand, since each single fiber can be bonded to the cement matrix, the adhesion surface area with the cement matrix is large and the adhesion strength is strong. In addition, since the high-strength and high-modulus fibers are arranged in a straight line and the periphery is covered with the fused fibers, the performance of the high-strength and high-modulus fibers can be maximized.
[0007]
Examples of the high strength and high elastic modulus fibers that can be suitably used in the high toughness fiber reinforced concrete product of the present invention include ultrahigh molecular weight polyolefin fibers. Polyethylene and polypropylene are generally used as the polyolefin, but are not particularly defined. More preferably, ultra high molecular weight polyethylene having high strength and elastic modulus is preferred. In addition, the ultrahigh molecular weight polyethylene fiber used in the present invention is very stable even under cement alkalinity and excellent in light resistance, so that the fiber-reinforced cement product of the present invention is excellent in durability. Furthermore, the fiber that can be suitably used as the fusion fiber is not particularly limited as long as it can be partially fused, but considering durability, a polyolefin excellent in weather resistance is preferable, and a core-sheath structure Of these, at least the outer sheath is preferably a low melting point polyolefin resin. Furthermore, it is preferable to use a heat-bonded composite fiber whose core part is made of polypropylene resin and whose sheath part is made of low-melting-point polyethylene. Can be granted.
[0008]
The concrete reinforcing fiber used in the present invention preferably has a total fineness of 100 dtex to 6,000 dtex. Furthermore, it is preferably 400 to 4,000 dtex. If the total fineness is reduced, the number of inputs per unit volume can be increased. However, the productivity of the reinforcing fibers is poor, and in terms of cost, the thicker the total fibers, the lower the cost. On the other hand, if the fiber bundle becomes too thick, the fiber bundle becomes a defective part of the cement matrix and the performance of the fiber reinforced concrete is deteriorated.
[0009]
Furthermore, the number of coverings of the fused fiber of the present invention is preferably 30 to 900 T / m, more preferably 40 to 200 T / m. The twist angle (angle between the yarn length direction of the core yarn and the covering yarn) is 5 to 40 °, preferably 10 to 30 °, and more preferably 10 to 24 °. Moreover, in order to reinforce the coarse aggregate-mixed concrete, the cut length of the concrete reinforcing fiber needs to be longer than the diameter of the coarse aggregate. In order to converge the fiber bundle, it is necessary to cover at least 1 T / cut length or more. On the other hand, when the number of coverings is increased, the convergence of the fiber bundle is increased and the kneading property is improved. However, when the number is too large, the adhesion between the single fiber and the cement matrix is lowered, and the performance of the fiber reinforced concrete product is lowered. Therefore, a concrete reinforcing fiber having optimum kneadability and reinforcing effect can be obtained by appropriately selecting the number of coverings.
[0010]
The single fiber diameter of the concrete reinforcing fiber used in the present invention is preferably 5 to 50 [mu], and more preferably 10 to 40 [mu]. When the diameter of the single fiber is increased, the adhesion area between each single fiber and the cement matrix is reduced, and the adhesion force of the fiber bundle is reduced. When the single fiber diameter is decreased, the kneadability is decreased due to the decrease in the rigidity of the fiber bundle.
[0011]
【Example】
(Examples 1-4, Comparative Examples 1 and 2)
The manufacturing method of the fiber used for this invention is described below.
Covering (twisting) high-strength and high-modulus polyethylene fibers (2640, 1760, and 440 dtex) with a core yarn and heat-adhesive conjugate fiber (760 and 190 dtex) with a polypropylene sheath made of low-melting polyethylene. Condition: 47 T / mm, twist direction: Z). In the case of Comparative Example 2, the number of coverings was 1000 T / m. Further, partial heating was performed with an adhesive heat roller (about 120 ° C.) and a non-adhesion heat heater (about 120 ° C.). The fused fiber was cut into a cut length of 30 mm and used.
[0012]
The measurement method and measurement conditions relating to the strength and elastic modulus of the concrete reinforcing fiber used in the present invention will be described below.
For the strength and elastic modulus of the concrete reinforcing fiber used in the present invention, “Tensilon” manufactured by Orientic Co., Ltd. was used, and a strain-stress curve was created under the conditions of a sample length of 200 mm (length between chucks) and an elongation rate of 100% / min. Measured under the conditions of a temperature of 20 ° C and a relative humidity of 65%, the stress at the breaking point of the curve is strength (cN / dtex), and the elastic modulus (cN / dtex) is calculated from the tangent that gives the maximum gradient near the origin of the curve. Asked. In addition, each value used the average value of 5 times of measured values.
Table 1 shows the physical property values of the obtained fibers.
[0013]
[Table 1]
The experimental method used in the present invention is shown below.
Table 2 shows a list of materials used. As cement, early-strength Portland cement was used, and blast furnace slag fine powder was used as an admixture.
[0015]
Formulation: Table 3 shows the formulation used. For all the blends, a fiber having a cut length of 30 mm was used as the concrete reinforcing fiber, and the fiber volume ratio Vf was constant at 1.0%.
[0016]
[Table 2]
[Table 3]
Kneading: A forced biaxial mixer with a capacity of 55 l was used. As a kneading procedure, cement, blast furnace slag, sand and crushed stone were kneaded for 15 seconds, water and a high-performance AE water reducing agent were added, kneaded for 30 seconds, and then kneaded for 3 minutes while adding fibers. A high frequency vibrator was used to compact the specimen.
[0019]
Test method: The slump test was conducted according to JIS A1101. The compression test was based on the JIS A1108 method, and a compression stress-strain curve was measured using a φ100 × 200 mm cylindrical specimen. The bending test was based on JIS A1106, and an overload-loading point displacement curve was measured by a central three-point bending load (span length 300 mm) using a prismatic body of 100 × 100 × 400 mm. Three specimens were prepared and tested after 14 days of standard curing material age. The Young's modulus was determined as the area under the load-displacement curve up to a standard displacement of 2 mm in accordance with the JCI standard and the bending toughness according to the 1/3 secant elastic modulus.
[0020]
As Comparative Example 1, a normal cut product of 30 mm was used. In Examples 1-2, the thickness of the covering yarn was changed, and in Examples 3-4, the weight ratio of the high strength / high elastic modulus polyethylene fiber and the fused fiber was kept constant, and the total fineness was changed, so that the amount per unit volume was added. The number was changed.
[0021]
As Comparative Example 2, a lot-like fused yarn obtained by increasing the number of coverings and fusing the entire surface of the fused yarn with the covering yarn was cut into 30 mm and used.
[0022]
[Table 4]
The slump value, compression and bending strength test results are shown in Table 4. The slump value increased as the degree of convergence increased. Compared with the comparative example, there was almost no thread twist, and the fluidity | liquidity which can be used as pressure feeding or sprayed concrete was confirmed. In particular, Examples 1 and 2 are extremely excellent in kneadability and workability. The compressive strength was higher than that of the comparative example, and there was a tendency to increase as the convergence was increased. The bending strength and bending toughness of Example 3 were the same as those of ordinary fibers, and Examples 1, 2, and 4 were higher than those of ordinary fibers. Particularly, in general, Example 1 is extremely excellent in both workability and performance. In addition, Example 4 with a large number of inputs showed extremely high bending strength and bending toughness.
[0024]
【The invention's effect】
According to the present invention, it is suitable for general concrete mixed with coarse aggregates, tunnel shot concrete, slope concrete, road pavement concrete, etc. It was possible to provide high performance fiber reinforced concrete products.
Claims (6)
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| JP2006290722A (en) * | 2005-03-15 | 2006-10-26 | Toyobo Co Ltd | Concrete excellent in explosion resistance |
| KR20090042882A (en) * | 2006-08-07 | 2009-05-04 | 데이진 화이바 가부시키가이샤 | Fiber cord for reinforcement with excellent adhesive strength and manufacturing method thereof |
| JP5121016B2 (en) * | 2008-06-19 | 2013-01-16 | 株式会社クラレ | Synthetic fiber bundle for cement mixed embankment reinforcement |
| JP4980392B2 (en) * | 2009-04-03 | 2012-07-18 | 株式会社ビルドランド | Fiber reinforced cement mortar |
| JP2016166111A (en) * | 2015-03-10 | 2016-09-15 | 東洋紡株式会社 | Concrete reinforcing wire |
| JP6794661B2 (en) * | 2016-05-31 | 2020-12-02 | 東洋紡株式会社 | Fiber material for reinforcing cement-based structures |
| WO2019111830A1 (en) * | 2017-12-04 | 2019-06-13 | クラレトレーディング株式会社 | Twisted yarn and twisted yarn structure using same |
| CN110905555A (en) * | 2019-12-11 | 2020-03-24 | 湘潭大学 | A kind of UHPC lining structure for tunnel and construction method thereof |
| TR202014623A1 (en) * | 2020-09-15 | 2022-03-21 | Kordsa Tekni̇k Teksti̇l Anoni̇m Şi̇rketi̇ | MICROFIBER SPRAYING CONCRETE MIXTURE |
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| JP3186498B2 (en) * | 1995-03-03 | 2001-07-11 | 大和紡績株式会社 | Bundled fiber for cement reinforcement |
| JP2000264708A (en) * | 1999-03-23 | 2000-09-26 | Toyobo Co Ltd | High-toughness fiber reinforced cement product and its production |
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