JP2003128447A - Nonwoven fabric mat having high rigidity for reinforcing hydraulic substance - Google Patents
Nonwoven fabric mat having high rigidity for reinforcing hydraulic substanceInfo
- Publication number
- JP2003128447A JP2003128447A JP2001322441A JP2001322441A JP2003128447A JP 2003128447 A JP2003128447 A JP 2003128447A JP 2001322441 A JP2001322441 A JP 2001322441A JP 2001322441 A JP2001322441 A JP 2001322441A JP 2003128447 A JP2003128447 A JP 2003128447A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- organic synthetic
- strength
- synthetic fiber
- reinforcing
- 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.)
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Links
Landscapes
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、脆性物であるセメ
ント等の水硬性物質の補修・補強の補強材として用いる
ことにより、施工が簡単で、セメント等の水硬性物質を
より強固、より高靭性にすることができる水硬性物質補
強用高靭性不織布マットに関するものである。TECHNICAL FIELD The present invention relates to a reinforcing material for repairing / reinforcing a hydraulic material such as cement, which is a brittle material, so that the construction is simple, and the hydraulic material such as cement is stronger and more durable. The present invention relates to a high-toughness non-woven mat for reinforcing a hydraulic material that can be made tough.
【０００２】[0002]
【従来の技術】ポルトランドセメントで代表される水硬
性物質からなる水硬性硬化物は、圧縮強度が強く不燃で
耐久性があり、安価なため土木建築用途に大量に使用さ
れているが、得られる水硬性硬化物は引っ張り強力が弱
いので、その補強材として鉄筋が一般的に使用されてい
る。しかし鉄筋補強水硬性硬化物は構造的には鉄筋の被
り厚さが必要であるが、この被り部分が近年水硬性硬化
物の塩害・中性化により脆弱となり、水硬性硬化物片の
剥離剥落事故が多発する現象が多々発生するため、早急
な対策が求められている。2. Description of the Related Art A hardened hydraulic material made of a hydraulic material typified by Portland cement has high compressive strength, is nonflammable and durable, and is inexpensive and therefore used in large amounts for civil engineering and construction applications. Since a hydraulically hardened material has a weak tensile strength, reinforcing bars are generally used as a reinforcing material. However, the reinforcing bar hydraulically cured product requires structurally the covering thickness of the reinforcing bar, but in recent years, this covered part became fragile due to salt damage and neutralization of the hydraulically hardened product, and peeling off of the hydraulically hardened product piece Since many accidents occur frequently, urgent countermeasures are required.
【０００３】従来、コンクリート等の水硬性物質からな
る水硬性硬化物を補修・補強する方法としては、具体的
には、水硬性硬化物の不良箇所をウォータージェット等
にて撤去し、その上面をポリマー系の高強度コンクリー
トやモルタルを吹き付ける工法や、鋼板を貼り付ける工
法、短繊維混入コンクリートやモルタルを吹き付ける工
法、一部アラミド繊維、ガラス繊維、ポリビニルアルコ
ール系繊維等で作成したシートを合成樹脂を用いて貼り
付ける工法、あるいは光硬化性樹脂を貼り付ける工法等
が開発され、また一部実施されている。Conventionally, as a method for repairing / reinforcing a hydraulically hardened material made of a hydraulically hardened material such as concrete, concretely, a defective portion of the hydraulically hardened material is removed by a water jet or the like, and the upper surface thereof is removed. A method of spraying polymer-based high-strength concrete or mortar, a method of sticking steel plates, a method of spraying short fiber-mixed concrete or mortar, or a sheet made of aramid fiber, glass fiber, polyvinyl alcohol fiber, etc. A method of sticking by using it, a method of sticking a photocurable resin, and the like have been developed and partially implemented.
【０００４】しかしながら、鋼板を貼り付ける工法の場
合、初期性能は確保できるが、重量が大となるため設備
が大がかりとなり施工性が悪く、またポリマー系のコン
クリートやモルタルを吹き付ける工法では何れも材料が
非常に高価となり、経済性が悪い等の問題がある。一
方、短繊維混入コンクリートやモルタルを補修面に直接
吹き付ける工法は、短繊維により引っ張り応力が伝達さ
れるので有用な工法であるが、一定量以上の繊維をコン
クリートに混入した場合、流動性が非常に低下するため
ミキサー車よりの排出、コンクリートポンプによるポン
プ圧送等が困難になり、そのため吹き付け施工が困難と
なる場合がある。また繊維混入による吹き付けの場合、
マトリクス中に繊維が偏在する事があり、均一な品質の
補強層が得られない場合がある。However, in the case of the method of sticking steel plates, the initial performance can be secured, but since the weight is large, the equipment becomes large and the workability is poor, and in the method of spraying polymer concrete or mortar, the material is There is a problem that it becomes very expensive and the economy is poor. On the other hand, the method of directly spraying short fiber mixed concrete or mortar onto the repaired surface is a useful method because the tensile stress is transmitted by the short fibers, but when mixing a certain amount of fibers or more into the concrete, the fluidity is extremely high. It becomes difficult to discharge from the mixer truck and pump with a concrete pump, etc., which makes spraying difficult. In the case of spraying due to fiber mixture,
Since fibers may be unevenly distributed in the matrix, a reinforcing layer of uniform quality may not be obtained.
【０００５】[0005]
【発明が解決しようとする課題】本発明者等は、上記の
課題を解決するために鋭意努力した結果、繊維物性の異
なる有機合成繊維Ａおよび有機合成繊維Ｂで構成され、
所定の嵩比重をもった不織布マットを剥落補修個所に型
枠を介して取付け、該不織布マットにセメント等の水硬
性物質を注入して含浸させ、硬化させることによりコン
クリート等の水硬性硬化物が高強度、高靭性となり、か
つ施工性が格段に向上することを見出した。本発明の水
硬性物質補強用高靭性不織布マットは本発明者らが開発
した特公平８―１１７０６号公報記載の不織布を更に改
良しており、コンクリート等水硬性物質の補強材として
用いた場合、得られる水硬性硬化物は、ひび割れ発生直
後の強度の低下がなく、かつ破壊強度が初期クラック強
度よりも大きく、しかも品質が均一な高靭性補強層から
なる。DISCLOSURE OF THE INVENTION As a result of diligent efforts to solve the above problems, the inventors of the present invention are composed of an organic synthetic fiber A and an organic synthetic fiber B having different fiber physical properties,
A non-woven mat having a predetermined bulk specific gravity is attached to a stripping repair point through a formwork, and a hydraulic substance such as cement is injected and impregnated into the non-woven mat to be hardened to obtain a hardened concrete such as concrete. It has been found that it has high strength and high toughness and the workability is remarkably improved. The high toughness non-woven fabric mat for reinforcing a hydraulic substance of the present invention is a further improvement of the non-woven fabric described in Japanese Patent Publication No. 8-11706 developed by the present inventors, and when used as a reinforcing material for a hydraulic substance such as concrete, The obtained hydraulically cured product is composed of a high toughness reinforcing layer having no deterioration in strength immediately after cracking, a breaking strength higher than the initial crack strength, and a uniform quality.
【０００６】[0006]
【課題を解決するための手段】本発明は、ひび割れ発生
直後の強度の低下がなく、品質が均一で施工性・経済性
に優れたコンクリート等水硬性物質の補修・補強に用い
る水硬性物質補強用高靭性不織布マット（以下、高靭性
不織布マットと略す）に関するものである。すなわち本
発明は、以下の１）、２）の条件を満足する有機合成繊
維Ａおよび有機合成繊維Ｂからなり、該有機合成繊維Ａ
と該有機合成繊維Ｂの割合が重量比でＡ：Ｂ＝８０：２
０〜２０：８０で構成され、嵩比重が０．００８〜０．
０１８ｇ／cm３である水硬性硬化物の補修・補強に用い
る不織布マットであって、該不織布マットを含有した水
硬性硬化物の破壊強度が初期クラック強度よりも大きい
ことを特徴とする水硬性物質補強用高靭性不織布マット
である。
１）有機合成繊維Ａは、繊維繊度８０〜１５０ｄｔｅ
ｘ、かつ破断伸度１０％以下であり、有機合成繊維Ａを
単独で含有して得られる水硬性硬化物の破壊強度と初期
クラック強度の関係が、破壊強度＞初期クラック強度で
あること、
２）有機合成繊維Ｂは、繊維繊度３００〜５００ｄｔｅ
ｘ、かつ破断伸度７％以下であり、有機合成繊維Ｂを単
独で含有して得られる水硬性硬化物の破壊強度と初期ク
ラック強度の関係が、破壊強度＜初期クラック強度であ
ること、そして本発明は、好ましくは有機合成繊維Ａお
よび有機合成繊維Ｂがポリビニルアルコール系繊維、ポ
リオレフィン系繊維、ポリアミド系繊維、ポリエステル
系繊維のうちいずれかである、上記の高靭性不織布マッ
トに関する。DISCLOSURE OF THE INVENTION The present invention provides a hydraulic material reinforcement for repairing / reinforcing a hydraulic material such as concrete which has uniform strength and is excellent in workability and economy without deterioration in strength immediately after cracking. The present invention relates to a high-toughness nonwoven fabric mat for use in the present invention (hereinafter referred to as a high-toughness nonwoven fabric mat). That is, the present invention comprises an organic synthetic fiber A and an organic synthetic fiber B which satisfy the following conditions 1) and 2).
And the weight ratio of the organic synthetic fiber B is A: B = 80: 2.
It is composed of 0 to 20:80 and has a bulk specific gravity of 0.008 to 0.
A non-woven fabric mat used for repairing / reinforcing a hydraulically hardened product having a weight of 018 g / cm 3 , wherein the fractured strength of the hydraulically hardened product containing the non-woven fabric mat is larger than the initial crack strength. A high toughness non-woven mat for reinforcement. 1) The organic synthetic fiber A has a fiber fineness of 80 to 150 dte.
x, the breaking elongation is 10% or less, and the relationship between the fracture strength and the initial crack strength of the hydraulically cured product obtained by containing the organic synthetic fiber A alone is such that the fracture strength> the initial crack strength. ) The organic synthetic fiber B has a fiber fineness of 300 to 500 dte.
x, the breaking elongation is 7% or less, the relationship between the fracture strength and the initial crack strength of the hydraulically cured product obtained by containing the organic synthetic fiber B alone is such that the fracture strength is less than the initial crack strength, and The present invention preferably relates to the above high toughness non-woven mat, wherein the organic synthetic fiber A and the organic synthetic fiber B are any one of polyvinyl alcohol fiber, polyolefin fiber, polyamide fiber and polyester fiber.
【０００７】本発明の高靭性不織布マットは、繊維物性
の異なる有機合成繊維Ａおよび有機合成繊維Ｂからな
り、該有機合成繊維Ａ、Ｂが重量比でＡ：Ｂ＝８０：２
０〜２０：８０、嵩比重が０．００８〜０．０１８ｇ／
cm３の範囲で構成されていることが必要である。有機合
成繊維Ａの割合が８０パーセントを越えると、得られた
不織布の嵩比重が大きくなり、セメントミルクの含浸性
が問題となり施工性に問題を残す。一方、有機合成繊維
Ａの割合が２０パーセント未満となると得られる水硬性
硬化物の破壊強度が初期クラック強度より向上せず、目
的とする高靭性の性能が得られない。好ましくはＡ：Ｂ
＝７０：３０〜３０：７０、より好ましくは６０：４０
〜４０：６０の範囲である。The high toughness nonwoven fabric mat of the present invention comprises an organic synthetic fiber A and an organic synthetic fiber B having different fiber physical properties, and the organic synthetic fibers A and B are in a weight ratio of A: B = 80: 2.
0 to 20:80, and bulk specific gravity of 0.008 to 0.018 g /
It must be constructed in the cm 3 range. If the proportion of the organic synthetic fibers A exceeds 80%, the bulk density of the obtained nonwoven fabric becomes large, and the impregnability of cement milk becomes a problem, leaving a problem in workability. On the other hand, when the proportion of the organic synthetic fiber A is less than 20%, the fracture strength of the obtained hydraulically cured product does not improve more than the initial crack strength, and the desired high toughness performance cannot be obtained. Preferably A: B
= 70: 30 to 30:70, more preferably 60:40
The range is from 40:60.
【０００８】また、本発明の高靭性不織布マットの嵩比
重が０．００８ｇ／cm３より小さい場合、不織布の密度
が疎になり過ぎて、水硬性物質に占める割合が小さくな
り、補強効果が得られない。一方、嵩比重が０．０１８
ｇ／cm３より大きい場合、セメントミルクの含浸性が問
題となり施工性に問題が生じる。好ましくは、０.０１
０〜０．０１５ｇ／cm３の範囲である。When the bulk specific gravity of the high toughness non-woven mat of the present invention is less than 0.008 g / cm 3 , the density of the non-woven fabric becomes too sparse and the ratio of the hydraulic substance becomes small, so that the reinforcing effect is obtained. I can't. On the other hand, the bulk specific gravity is 0.018
When it is larger than g / cm 3 , the impregnating property of cement milk becomes a problem and the workability becomes problematic. Preferably 0.01
It is in the range of 0 to 0.015 g / cm 3 .
【０００９】次に、本発明の高靭性不織布マットを構成
する有機合成繊維Ａ、有機合成繊維Ｂについて、以下詳
細に説明する。まず、有機合成繊維Ａは、繊維繊度８０
〜１５０ｄｔｅｘ、破断伸度１０％以下からなる繊維で
ある必要がある。有機合成繊維Ａの繊維繊度が８０ｄｔ
ｅｘより小さい場合、不織布マットの嵩比重が大きくな
りセメントミルクの含浸性等施工性に問題を残す。また
繊維繊度が１５０ｄｔｅｘより大きくなると、繊維本数
が不足し高靭性が得られにくい。好ましくは１００〜１
３０ｄｔｅｘである。さら繊維の破断伸度が１０％より
大きくなると、得られる水硬性硬化物において、初期ク
ラック発生後の応力の低下が大きく、たわみが増加して
も応力が低下した状態なので靭性を確保できない。好ま
しくは８％以下３％以上である。Next, the organic synthetic fibers A and B constituting the high toughness nonwoven fabric mat of the present invention will be described in detail below. First, the organic synthetic fiber A has a fiber fineness of 80.
It is necessary that the fiber is composed of ˜150 dtex and a breaking elongation of 10% or less. The fiber fineness of the organic synthetic fiber A is 80 dt
If it is smaller than ex, the bulk specific gravity of the non-woven mat becomes large, leaving a problem in workability such as impregnation of cement milk. When the fiber fineness is more than 150 dtex, the number of fibers is insufficient and it is difficult to obtain high toughness. Preferably 100 to 1
It is 30 dtex. When the breaking elongation of the fiber is more than 10%, the resulting hydraulically hardened product has a large decrease in stress after the initial cracking, and the toughness cannot be ensured because the stress is decreased even if the flexure increases. It is preferably 8% or less and 3% or more.
【００１０】次に、有機合成繊維Ｂについてであるが、
有機合成繊維Ｂの役割としては、有機合成繊維Ａを補完
すること、すなわちセメントミルクの注入が可能となる
嵩比重確保であり、具体的には、繊維繊度３００〜５０
０ｄｔｅｘ、破断伸度７％以下からなる繊維である。繊
維繊度が３００ｄｔｅｘより小さい場合、不織布マット
の嵩比重が大きくなりセメントミルクの含浸性等の施工
性に問題を残す。また繊維繊度が５００ｄｔｅｘより大
きくなると、繊維本数が不足し高靭性が得られにくい。
好ましくは３５０〜４５０ｄｔｅｘである。さらに破断
伸度が７％よりも大きくなると、初期クラック発生後の
強度低下が顕著となる。好ましくは６％以下２％以上で
ある。Next, regarding the organic synthetic fiber B,
The role of the organic synthetic fiber B is to complement the organic synthetic fiber A, that is, to secure the bulk specific gravity that enables the injection of cement milk, and specifically, the fiber fineness of 300 to 50.
It is a fiber having 0 dtex and a breaking elongation of 7% or less. When the fiber fineness is less than 300 dtex, the bulk specific gravity of the non-woven mat becomes large, and there remains a problem in workability such as impregnation with cement milk. When the fiber fineness is more than 500 dtex, the number of fibers is insufficient and it is difficult to obtain high toughness.
It is preferably 350 to 450 dtex. Further, when the breaking elongation is more than 7%, the strength reduction after the initial cracking becomes remarkable. It is preferably 6% or less and 2% or more.
【００１１】また、有機合成繊維Ａは、繊維成分が有機
合成繊維Ａのみ単独で含有された水硬性硬化物の破壊強
度と初期クラック強度の関係が、破壊強度＞初期クラッ
ク強度になるような特徴を有していることが必要であ
る。一方、有機合成繊維Ｂは、繊維成分が有機合成繊維
Ｂのみ単独で含有された水硬性硬化物の破壊強度と初期
クラック強度の関係が、破壊強度＜初期クラック強度に
なるような特徴を有していることが必要である。ここで
いう初期クラック強度とは、水硬性硬化物の曲げ強度−
たわみ曲線を作成したとき、曲げ強度とたわみが実質的
に比例関係を有し、かつ最大のたわみを示すときの強度
を示す。また破壊強度とは、水硬性硬化物が破壊したと
きの曲げ強度を示す。本発明の不織布は、上記したよう
に初期クラック発生後の強度低下低減の役割を示す有機
合成繊維Ａと、嵩比重確保を目的とする有機合成繊維Ｂ
の配合比を最適にすることにより高靭性のものが得られ
る。繊維で補強した水硬性物質が曲げ破壊された場合、
繊維の破断伸度によりマトリクスに初期クラックが生じ
た後の曲げ強度−たわみ曲線の挙動が変わってくる。靭
性を確保するためにはマトリクスに初期クラックが発生
した後、直ちに繊維が応力を負担することが必要であ
り、本発明においては有機合成繊維Ａよりも破断伸度の
低い有機合成繊維Ｂがその役割を分担しており、少し遅
れて有機合成繊維Ｂよりも破断伸度の大きい有機合成繊
維Ａが更に応力を分担することにより、その相乗効果で
高靭性が確保することができるものである。ここで、繊
維Ａの引張強度は好ましくは１０００Ｎ／mm２以上、よ
り好ましくは１１００Ｎ／mm２以上であり、一方、繊維
Ｂの引張強度は好ましくは８００Ｎ／mm２以上、より好
ましくは９００Ｎ／mm２以上である。Further, the organic synthetic fiber A is characterized in that the relationship between the fracture strength and the initial crack strength of a hydraulically cured product containing only the organic synthetic fiber A alone is such that the fracture strength> the initial crack strength. It is necessary to have On the other hand, the organic synthetic fiber B has such a characteristic that the relationship between the fracture strength and the initial crack strength of the hydraulically cured product containing only the organic synthetic fiber B as the fiber component is such that the fracture strength is less than the initial crack strength. It is necessary to have The initial crack strength referred to here is the bending strength of the hydraulically cured product-
When a flexure curve is created, the flexural strength and the flexure have a substantially proportional relationship, and the strength at which the maximum flexure is exhibited is shown. The breaking strength refers to the bending strength when the hydraulically cured product breaks. The non-woven fabric of the present invention includes the organic synthetic fiber A which plays a role of reducing the strength reduction after the initial cracking as described above, and the organic synthetic fiber B which is intended to secure the bulk specific gravity.
High toughness can be obtained by optimizing the compounding ratio of. When a fiber reinforced hydraulic material is bent and broken,
The behavior of the flexural strength-deflection curve after the initial cracking of the matrix changes depending on the breaking elongation of the fiber. In order to secure the toughness, it is necessary for the fibers to bear the stress immediately after the initial cracks are generated in the matrix. In the present invention, the organic synthetic fibers B having a lower breaking elongation than the organic synthetic fibers A are The organic synthetic fibers A, which have a larger elongation at break than the organic synthetic fibers B, further share the stress with a little delay, and the high toughness can be secured by the synergistic effect. Here, the tensile strength of the fiber A is preferably 1000 N / mm 2 or more, more preferably 1100 N / mm 2 or more, while the tensile strength of the fiber B is preferably 800 N / mm 2 or more, more preferably 900 N / mm 2. It is 2 or more.
【００１２】本発明で使用する繊維としては、有機合成
繊維の中でもポリビニルアルコール系繊維がセメント等
の水硬性物質との接着性においてより望ましいが、繊維
の種類は何ら制限されるものではなく、有機合成繊維、
半合成繊維、人造繊維、無機繊維、それらの２種以上の
併用等のいずれであってもよい。具体的にはポリエステ
ル系繊維、ポリアミド系繊維、ポリオレフィン系繊維、
アクリル系繊維等を挙げることができる。As the fiber used in the present invention, among the organic synthetic fibers, polyvinyl alcohol fiber is more preferable in terms of the adhesiveness to hydraulic substances such as cement, but the kind of fiber is not limited at all. Synthetic fiber,
It may be any of semi-synthetic fibers, artificial fibers, inorganic fibers, and combinations of two or more thereof. Specifically, polyester fibers, polyamide fibers, polyolefin fibers,
Acrylic fibers and the like can be mentioned.
【００１３】本発明の不織布マットの製造方法として
は、例えば本発明の重量比で構成された有機合成繊維Ａ
および有機合成繊維Ｂをあや振りエアーサッカー等を通
じて移動する金網ネット上に供給し不織布を形成せしめ
た後、繊維どうしを固定するために接着剤処理をして乾
燥熱処理すればよい。接着剤はスプレーで吹き付けて
も、また接着剤浴中に浸漬してもよい。嵩比重及び厚み
の調整は繊維の繊度の選択、繊維長、給糸速度、ネット
速度及び接着剤処理後のプレスによって調節できる。不
織布マットの製造時に繊維どうしを固定するために使用
する接着剤は、繊維の種類や単繊維の繊度によって接着
性が異なるので、市販の接着剤の中から適宜選ぶのが好
ましい。本発明で用いられる接着剤としては、ポリ酢酸
ビニル系、メラミン系エチレン−酢酸ビニル共重合体、
アクリル系、エポキシ系等の水系エマルジョンが接着性
や作業性の面で好ましく用いられる。またポリビニルア
ルコールやその変性物等の水溶性高分子接着剤も使用で
きる。As the method for producing the non-woven fabric mat of the present invention, for example, the organic synthetic fiber A constituted by the weight ratio of the present invention is used.
Further, the organic synthetic fiber B may be fed onto a wire mesh net which moves through a swaying air sucker or the like to form a non-woven fabric, and then an adhesive treatment and a dry heat treatment may be performed to fix the fibers. The adhesive may be sprayed on or may be immersed in the adhesive bath. The bulk specific gravity and the thickness can be adjusted by selecting the fineness of the fiber, the fiber length, the yarn feeding speed, the net speed, and the press after the adhesive treatment. The adhesive used for fixing the fibers to each other during the production of the non-woven mat has different adhesive properties depending on the type of fibers and the fineness of the single fibers, and therefore it is preferable to appropriately select from the commercially available adhesives. As the adhesive used in the present invention, polyvinyl acetate-based, melamine-based ethylene-vinyl acetate copolymer,
Aqueous emulsions such as acrylics and epoxies are preferably used in terms of adhesion and workability. A water-soluble polymer adhesive such as polyvinyl alcohol or a modified product thereof can also be used.
【００１４】本発明の高靭性不織布マットは土木用の客
土や盛土等の土砂の補強や現場施工用セメントモルタル
等の成型部材、トンネルや法面などのセメント吹付け工
法へのセメント等のマトリックス保持材、ひび割れ防止
材、及び補強材として用いることができる。The high toughness non-woven mat of the present invention is a matrix of cement or the like for cement spraying construction method such as cement mortar or the like for reinforcement of earth and sand such as civil engineering soil or embankment or on-site construction. It can be used as a holding material, a crack preventing material, and a reinforcing material.
【００１５】[0015]
【実施例】以下実施例によって、本発明を説明するが、
本発明はこれら実施例により何等限定されるものではな
い。なお本発明の実施例において、ポリビニルアルコー
ルの重合度、繊維繊度、繊維強度、破断伸度、不織布の
嵩比重は以下の測定方法により測定されたものを意味す
る。The present invention will be described with reference to the following examples.
The present invention is not limited to these examples. In the examples of the present invention, the degree of polymerization of polyvinyl alcohol, the fiber fineness, the fiber strength, the elongation at break, and the bulk specific gravity of the nonwoven fabric are those measured by the following measuring methods.
【００１６】［ポリビニルアルコールの重合度］ＪＩＳ
Ｋ６７２６に準拠して測定した。[Polyvinyl alcohol degree of polymerization] JIS
It measured based on K6726.
【００１７】［繊度 ｄｔｅｘ］得られた繊維状物の一
定試長の重量を測定して見掛け繊度をｎ＝５以上で測定
し、平均値を求めた。[Fineness dtex] The resulting fibrous material was weighed for a fixed length to measure the apparent fineness at n = 5 or more, and the average value was obtained.
【００１８】［繊維強度 Ｎ／mm２、破断伸度 ％］予
め温度２０℃、相対湿度６５％の雰囲気下で２４時間繊
維を放置して調湿したのち、単繊維を試長１０cm、引張
速度５cm／分としてインストロン試験機「島津製作所製
オートグラフ」にて繊維強度を測定した。伸度は、単繊
維破断（cm）／把持長（cm）×１００により算出した。
なお繊維長が１０cmより短い場合は、そのサンプルの可
能な範囲での最大長さを把持長として測定することとし
た。[Fiber Strength N / mm 2 , Breaking Elongation%] The fibers were allowed to stand for 24 hours in an atmosphere of a temperature of 20 ° C. and a relative humidity of 65% in advance to adjust the humidity. The fiber strength was measured with an Instron tester "Shimadzu Autograph" at 5 cm / min. The elongation was calculated by breaking the single fiber (cm) / holding length (cm) × 100.
When the fiber length was shorter than 10 cm, the maximum length of the sample in the possible range was measured as the gripping length.
【００１９】［不織布の嵩比重 ｇ／cm３］不織布シー
トの重量をその占める見掛け体積で除した値を示した。[Bulk Specific Gravity of Nonwoven Fabric g / cm 3 ] A value obtained by dividing the weight of the nonwoven fabric sheet by the apparent volume occupied by the nonwoven fabric sheet is shown.
【００２０】［実施例１〜３、比較例１〜５］重合度１
７００のポリビニルアルコールをジメチルスルホキシド
（ＤＭＳＯ）中に溶解し、２０．７％とした紡糸原液を
溶剤湿式紡糸して延伸熱処理し、繊維繊度が５０ｄｔｅ
ｘ、繊維強度１０００Ｎ／mm２、破断伸度８％、および
繊維繊度１００ｄｔｅｘ、繊維強度１１００Ｎ／mm２、
破断伸度９％の２種類の繊維Ａのモノフィラメント繊維
を得た。また重合度１７００のポリビニルアルコールを
５０％の水溶液とした紡糸原液を常法により乾式紡糸し
て延伸熱処理し、繊維繊度４００ｄｔｅｘ、繊維強度８
９０Ｎ／mm２、破断伸度６％、および繊維繊度６００ｄ
ｔｅｘ、繊維強度９２０Ｎ／mm２、破断伸度５％の２種
類の繊維Ｂのモノフィラメント繊維を得た。該モノフィ
ラメント繊維を５インチの長さに各々カットし、それを
引き揃えて縄状とし熱処理を施しそれを解繊する。更に
解繊した嵩高性を持たせた繊維Ａ・Ｂを表１に示す割合
にて混合しエアーブローにより幅１．２ｍのネット上に
三次元立体勾配となるように給糸し、接着剤としてポリ
ビニルアルコール樹脂水溶液をスプレー散布した後、厚
さ５０mmに押さえて温度１５０℃で１０分間、乾燥熱処
理して不織布を作成した。不織布マットの構成を表１に
示す。[Examples 1 to 3, Comparative Examples 1 to 5] Degree of polymerization 1
700 polyvinyl alcohol was dissolved in dimethylsulfoxide (DMSO), and 20.7% of the stock solution for spinning was solvent-spun and stretch-heat treated to obtain a fiber fineness of 50 dte.
x, fiber strength 1000 N / mm 2 , breaking elongation 8%, and fiber fineness 100 dtex, fiber strength 1100 N / mm 2 ,
Two types of fiber A monofilament fibers having a breaking elongation of 9% were obtained. In addition, a spinning solution containing polyvinyl alcohol having a degree of polymerization of 1700 as a 50% aqueous solution was dry-spun by a conventional method and stretch-heat treated to obtain a fiber fineness of 400 dtex and a fiber strength of 8
90 N / mm 2 , breaking elongation 6%, and fiber fineness 600d
Two types of fiber B monofilament fiber having tex, fiber strength of 920 N / mm 2 , and breaking elongation of 5% were obtained. Each of the monofilament fibers is cut into a length of 5 inches, and the filaments are aligned and formed into a rope shape and heat-treated to defibrate it. Further, the disentangled and bulky fibers A and B were mixed at the ratio shown in Table 1 and air-blown to provide a three-dimensional three-dimensional gradient on a 1.2 m wide net, which was then used as an adhesive. After spraying the polyvinyl alcohol resin aqueous solution, the thickness was kept to 50 mm, and dried and heat-treated at a temperature of 150 ° C. for 10 minutes to prepare a nonwoven fabric. The constitution of the non-woven mat is shown in Table 1.
【００２１】[0021]
【表１】 [Table 1]
【００２２】得られた個々の不織布マットを幅１０cm、
長さ４０cmに切断し、幅１０cm、長さ４０cm、高さ５cm
の鋼製型枠に敷き、ポルトランドセメントを用いた水／
セメント＝０．３５のセメントミルクを流し込み供試体
を作成した。流し込みに際しては、均一性を保つため振
動成形機を併用した。打設後室温２０℃、湿度６５％の
室内に２４時間放置し脱型し、２８日間気中養生を行な
い、繊維補強板を得た。養生完了後の供試体を島津製作
所製のオートグラフを用い、三等分点載荷にて曲げ試験
を実施した。その物性値の測定した結果を表２、曲げ強
度−たわみ曲線を図１に示す。The individual non-woven mats thus obtained are 10 cm wide,
Cut to a length of 40 cm, width 10 cm, length 40 cm, height 5 cm
Water on Portland cement
Cement = 0.35 cement milk was poured to prepare a test sample. When pouring, a vibration molding machine was used together to maintain uniformity. After the casting, it was left in a room having a room temperature of 20 ° C. and a humidity of 65% for 24 hours, demolded, and cured in air for 28 days to obtain a fiber reinforced plate. Bending test was carried out on the specimen after completion of curing by using an autograph manufactured by Shimadzu Corporation under a trisection load. The measured results of the physical properties are shown in Table 2, and the bending strength-deflection curve is shown in FIG.
【００２３】比較例１、２の構成の不織布マットは嵩比
重が大きいため、セメントミルク充填性が劣っていた。
また比較例３〜５の構成の不織布マットは嵩比重が小さ
いため、セメントミルク充填性は問題なかったが、繊維
補強板の破壊強度は初期クラック強度と同等かまたは破
壊強度より小さく、高靭性が得られなかった。一方、実
施例１〜３の構成の不織布マットを用いた繊維補強板は
比較例１〜５の不織布マットを用いた繊維補強板に比べ
て、セメントミルクの充填性に優れ、かつ破壊強度が初
期クラック強度よりも大きく、良好な靭性が得られた。Since the non-woven fabric mats of Comparative Examples 1 and 2 have a large bulk specific gravity, the cement milk filling property was poor.
In addition, since the non-woven mats of Comparative Examples 3 to 5 have a low bulk specific gravity, the cement milk filling property was not a problem, but the fracture strength of the fiber reinforced plate was equal to or smaller than the initial crack strength and the high toughness. I couldn't get it. On the other hand, the fiber-reinforced plates using the non-woven mats of the configurations of Examples 1 to 3 are excellent in cement milk filling and have an initial breaking strength as compared with the fiber-reinforced plates using the non-woven mats of Comparative Examples 1 to 5. Greater than the crack strength and good toughness was obtained.
【００２４】[0024]
【表２】 [Table 2]
【００２５】[0025]
【発明の効果】本発明の、繊維物性の異なる有機合成繊
維Ａおよび有機合成繊維Ｂからなり、所定の嵩比重をも
つ不織布マットを補強材として用いて得られる水硬性硬
化物は、ひび割れ発生直後の強度の低下がなく、破壊強
度が初期クラック強度よりも大きく、すなわち高靭性で
あり、かつ施工性が格段に向上する。その結果、品質が
均一な高靭性補強層を得ることができる。EFFECTS OF THE INVENTION The hydraulically cured product of the present invention obtained by using a non-woven fabric mat composed of an organic synthetic fiber A and an organic synthetic fiber B having different fiber physical properties and having a predetermined bulk specific gravity as a reinforcing material is immediately after cracking. The strength is not decreased, the fracture strength is larger than the initial crack strength, that is, the toughness is high, and the workability is remarkably improved. As a result, a high toughness reinforcing layer having uniform quality can be obtained.
【００２６】[0026]
【図１】実施例１〜３および比較例１〜５で得られた成
形物の曲げ強度−たわみ曲線を示す。FIG. 1 shows the bending strength-deflection curves of the molded products obtained in Examples 1 to 3 and Comparative Examples 1 to 5.
１：比較例１で得られた成形物の曲げ強度−たわみ曲線
２：比較例２で得られた成形物の曲げ強度−たわみ曲線
３：実施例１で得られた成形物の曲げ強度−たわみ曲線
４：実施例２で得られた成形物の曲げ強度−たわみ曲線
５：実施例３で得られた成形物の曲げ強度−たわみ曲線
６：比較例３で得られた成形物の曲げ強度−たわみ曲線
７：比較例４および比較例５で得られた成形物の曲げ強
度−たわみ曲線1: Bending strength of the molded product obtained in Comparative Example 1-deflection curve 2: Bending strength of the molded product obtained in Comparative Example 2-deflection curve 3: Bending strength of the molded product obtained in Example 1-Deflection Curve 4: Flexural Strength of Molded Product Obtained in Example 2-Flexural Curve 5: Flexural Strength of Molded Product Obtained in Example 3-Flexural Curve 6: Flexural Strength of Molded Product Obtained in Comparative Example 3- Deflection curve 7: Bending strength-deflection curve of molded articles obtained in Comparative Example 4 and Comparative Example 5.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4L047 AA14 AA16 AA21 AA23 AA28 AB07 BA17 BC05 CC13 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 4L047 AA14 AA16 AA21 AA23 AA28 AB07 BA17 BC05 CC13
Claims (2)
合成繊維Ａおよび有機合成繊維Ｂからなり、該有機合成
繊維Ａと該有機合成繊維Ｂの割合が重量比でＡ：Ｂ＝８
０：２０〜２０：８０で構成され、嵩比重が０．００８
〜０．０１８ｇ／cm３である水硬性物質の補修・補強に
用いる不織布マットであって、該不織布マットを含有し
た水硬性硬化物の破壊強度が初期クラック強度よりも大
きいことを特徴とする水硬性物質補強用高靭性不織布マ
ット。 １） 有機合成繊維Ａは、繊維繊度８０〜１５０ｄｔｅ
ｘ、かつ破断伸度１０％以下であり、有機合成繊維Ａを
単独で含有して得られる水硬性硬化物の破壊強度と初期
クラック強度の関係が、破壊強度＞初期クラック強度で
あること、 ２） 有機合成繊維Ｂは、繊維繊度３００〜５００ｄｔ
ｅｘ、かつ破断伸度７％以下であり、有機合成繊維Ｂを
単独で含有して得られる水硬性硬化物の破壊強度と初期
クラック強度の関係が、破壊強度＜初期クラック強度で
あること、1. An organic synthetic fiber A and an organic synthetic fiber B satisfying the following conditions 1) and 2), wherein the weight ratio of the organic synthetic fiber A to the organic synthetic fiber B is A: B = 8
It is composed of 0:20 to 20:80 and has a bulk specific gravity of 0.008.
A non-woven fabric mat used for repairing / reinforcing a hydraulic substance of 0.018 g / cm 3 in which the breaking strength of the hydraulically cured product containing the non-woven fabric mat is greater than the initial crack strength. High toughness non-woven mat for reinforcing hard materials. 1) The organic synthetic fiber A has a fiber fineness of 80 to 150 dte.
x, the breaking elongation is 10% or less, and the relationship between the fracture strength and the initial crack strength of the hydraulically cured product obtained by containing the organic synthetic fiber A alone is such that the fracture strength> the initial crack strength. ) The organic synthetic fiber B has a fiber fineness of 300 to 500 dt.
ex, the breaking elongation is 7% or less, and the relationship between the fracture strength and the initial crack strength of the hydraulically cured product obtained by containing the organic synthetic fiber B alone is such that the fracture strength is less than the initial crack strength.
ポリビニルアルコール系繊維、ポリオレフィン系繊維、
ポリアミド系繊維、ポリエステル系繊維のうちいずれか
である、請求項１の水硬性物質補強用高靭性不織布マッ
ト。2. The organic synthetic fiber A and the organic synthetic fiber B are polyvinyl alcohol fiber, polyolefin fiber,
The highly tough non-woven fabric mat for reinforcing a hydraulic material according to claim 1, which is either a polyamide fiber or a polyester fiber.
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