JP2009298636A - Staple fiber for reinforcing cement - Google Patents
Staple fiber for reinforcing cement Download PDFInfo
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- JP2009298636A JP2009298636A JP2008154069A JP2008154069A JP2009298636A JP 2009298636 A JP2009298636 A JP 2009298636A JP 2008154069 A JP2008154069 A JP 2008154069A JP 2008154069 A JP2008154069 A JP 2008154069A JP 2009298636 A JP2009298636 A JP 2009298636A
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- 239000000835 fiber Substances 0.000 title claims abstract description 154
- 239000004568 cement Substances 0.000 title claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 26
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 229920001230 polyarylate Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001470 polyketone Polymers 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims 1
- 239000001913 cellulose Substances 0.000 claims 1
- 229920002678 cellulose Polymers 0.000 claims 1
- 229920002647 polyamide Polymers 0.000 claims 1
- 229920000098 polyolefin Polymers 0.000 claims 1
- 229920000915 polyvinyl chloride Polymers 0.000 claims 1
- 239000004800 polyvinyl chloride Substances 0.000 claims 1
- MHSKRLJMQQNJNC-UHFFFAOYSA-N terephthalamide Chemical compound NC(=O)C1=CC=C(C(N)=O)C=C1 MHSKRLJMQQNJNC-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 12
- 230000000052 comparative effect Effects 0.000 description 6
- 239000012783 reinforcing fiber Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229920003235 aromatic polyamide Polymers 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229920001494 Technora Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000004950 technora Substances 0.000 description 3
- LVGKZTVMAHRVFR-UHFFFAOYSA-N 4-(phenoxazine-10-carbonyl)benzamide Chemical compound C1=CC(C(=O)N)=CC=C1C(=O)N1C2=CC=CC=C2OC2=CC=CC=C21 LVGKZTVMAHRVFR-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 241000237509 Patinopecten sp. Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 101100537773 Solanum lycopersicum TPM-1 gene Proteins 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000020637 scallop Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229920006312 vinyl chloride fiber Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Abstract
Description
本発明は、セメント成形品の補強用繊維に関するものである。詳しくは、繊維材料の混入により施工時の作業性を阻害することなく、強度補強用として好適な補強用繊維に関するものである。 The present invention relates to a reinforcing fiber for a cement molded article. Specifically, the present invention relates to a reinforcing fiber that is suitable for strength reinforcement without impairing workability during construction due to the mixing of fiber materials.
セメントなどの水性硬化粉体や反応基を含んだフェノール樹脂またはそのプレポリマーなどの熱硬化性粉体を含み、砂や石などの骨材や木粉やパルプなどの増量材または軽量化材などを一種または複数種含んだ混練物は、コンクリート摺材を作成する工程中で得られる。 Aqueous hardened powders such as cement and thermosetting powders such as phenolic resins or prepolymers containing reactive groups, such as aggregates such as sand and stone, and fillers or weight-reducing materials such as wood powder and pulp The kneaded material containing one or more types is obtained in the process of preparing the concrete sliding material.
最終的に水添やプレス、加熱、場合によっては養生工程を経て、得られる硬化物の引張りや曲げ、捻れに対する抵抗強度は、圧縮に対する抵抗強度に比較して一般的に低い。そのため、硬化物の引張りや曲げ、捻れに対する強度を向上、更に乾燥収縮によるひび割れを抑制させるべく、混練時に短繊維を添加・分散させて硬化物に内包させる方法は多方面で既になされている。 Finally, after hydrogenation, pressing, heating, and in some cases, a curing process, the resulting cured product has generally low resistance to tension, bending, and twisting compared to resistance to compression. Therefore, in order to improve the strength against tension, bending and twisting of the cured product, and to suppress cracking due to drying shrinkage, a method of adding and dispersing short fibers during kneading and encapsulating in the cured product has already been made in many fields.
硬化物の短繊維添加効果は添加量が多いほど高いが、添加した繊維が全て有効に働くとは限らない。添加した短繊維の一部は混練中に、セメント材料や細骨材や粗骨材、また短繊維同士が絡まって塊となったり、短繊維が添加状態のまま数百本が離解せずに貝柱やファイバーボールのような状態のまま残ったりする。これらを「分散不良物」と呼ぶ。この分散不良物に含まれる短繊維は目的とする硬化物の引張りや曲げ、捻れに対する強度の向上、更にひび割れ抑制に貢献しない上、繊維間に空気を含みセメント材料の圧縮強度を低下させたり、施工性を阻害することになる。 Although the short fiber addition effect of the cured product is higher as the addition amount is larger, not all the added fibers work effectively. During mixing, some of the added short fibers can be cemented, fine aggregate, coarse aggregate, short fibers entangled into a lump, or hundreds of short fibers can not be disaggregated with the short fibers added. It remains in a state like a scallop or fiber ball. These are called “dispersionally defective”. The short fibers contained in this poorly dispersed product do not contribute to the improvement of strength against tension, bending, and twisting of the target cured product, and further to suppress cracking, and air is contained between the fibers to reduce the compressive strength of the cement material, This will hinder the workability.
補強用短繊維の分散不良物を発生させない対策としては添加量を減らすことが考えられるが、目的とする補強用短繊維の効果が得られなくなるため、所定の繊維混入量でファイバーボールや繊維間の空気量を減らす必要がある。
このためにはセメント材料に投入する前の補強用短繊維がファイバーボールを発生せず、尚且つ繊維間になるべく空気を含まないことが必要である。
Although it is conceivable to reduce the amount added as a measure to prevent the occurrence of defective dispersion of reinforcing short fibers, the effect of the intended reinforcing short fibers cannot be obtained. It is necessary to reduce the amount of air.
For this purpose, it is necessary that the reinforcing short fibers before being put into the cement material do not generate fiber balls and contain as little air as possible between the fibers.
こうした問題の対策として特開平５−１３９８０３号公報には特定の繊維長とアスペクト比を有する２種類の合成繊維を補強繊維とすることが開示されている。確かにこの方法によりある程度繊維の絡まりによる塊りやファイバーボールの発生はある程度低下できるものの完全ではなかった。 As a countermeasure against such a problem, JP-A-5-139803 discloses that two types of synthetic fibers having a specific fiber length and aspect ratio are used as reinforcing fibers. Certainly, this method can reduce the generation of lumps and fiber balls due to entanglement of fibers to some extent, but it is not perfect.
又取扱いを容易にし、且つ塊状になるのを防止する目的で、デンプン、ポリビニルアルコール（以下、「ＰＶＡ」という）に代表される集束剤を用いてサイジングした繊維を使用する提案がなされてきた。（例えば、特開平７−３００７７３号公報、特開平８−３２５９４７号公報、特開平９−２７８５０３号公報等）集束されたセメント補強用繊維は、一定の長さにカットしたチップ状にて使用されるが、当該繊維集束体は、前述したようにサイジングされているため、取扱いが容易となると共にセメント組成物の撹拌中に添加しても塊状になることは少なくなるものの、短繊維集束体としては均一に分散するが単繊維のレベルでは均一な分散とはならず十分な強度や衝撃性のセメントは得られていなかった。又集束剤を使用するためコストが上がるとか、歩留まりが低下するという問題もあった。 In addition, for the purpose of facilitating handling and preventing lumps, proposals have been made to use fibers sized using a sizing agent typified by starch and polyvinyl alcohol (hereinafter referred to as “PVA”). (For example, JP-A-7-300773, JP-A-8-325947, JP-A-9-278503, etc.) The focused cement reinforcing fibers are used in the form of chips cut to a certain length. However, since the fiber bundle is sized as described above, it is easy to handle, and even if added during stirring of the cement composition, it does not become agglomerated, but as a short fiber bundle. However, it was not uniformly dispersed at the single fiber level, and a cement with sufficient strength and impact was not obtained. In addition, since the sizing agent is used, the cost increases and the yield decreases.
近年、特にコンクリートやモルタルの場合、環境保護などの観点からその耐久性向上が重視されるようになっている。この動きを受け、短繊維の添加量は、曲げ強度向上を目的とする場合は０．５〜２％程度、場合によっては３．０％と多量添加が必要となっている。これらを背景に、ファイバーボールの発生やセメント材料中の空気量増加を伴わない適正な補強用短繊維の提供が求められている。 In recent years, especially in the case of concrete and mortar, importance has been given to improving durability from the viewpoint of environmental protection. In response to this movement, the addition amount of the short fiber is about 0.5 to 2% for the purpose of improving the bending strength, and in some cases, it is necessary to add a large amount of 3.0%. Against this background, there is a demand for the provision of appropriate reinforcing short fibers that do not involve the generation of fiber balls and the increase in the amount of air in the cement material.
本発明の目的は、モルタル、コンクリート等のセメント材料に補強用短繊維を混練した際に、繊維塊り、ファイバーボールの発生等のない、セメント補強用繊維を提供することにある。 It is an object of the present invention to provide a cement reinforcing fiber that does not cause fiber clumping or generation of fiber balls when a reinforcing short fiber is kneaded with a cement material such as mortar or concrete.
本発明者は、前記課題を解決する為に鋭意検討した結果、補強用繊維の形状と、混入重量における嵩密度を制御するとき、上記の問題が大きく改善できることを見出し本発明に至った。 As a result of intensive studies to solve the above problems, the present inventor has found that the above problems can be greatly improved when controlling the shape of the reinforcing fiber and the bulk density in the mixed weight, and have reached the present invention.
すなわち、本発明によれば、
繊維長が６ｍｍ以上、アスペクト比が４０〜４００のセメント補強用短繊維であって、短繊維集合体の嵩密度が５ｍｌ／ｇ以下であることを特徴とするセメント補強用短繊維。
が提供される。
That is, according to the present invention,
A cement reinforcing short fiber having a fiber length of 6 mm or more and an aspect ratio of 40 to 400, wherein the short fiber aggregate has a bulk density of 5 ml / g or less.
Is provided.
本発明によれば、モルタル、コンクリート等のセメント材料に補強用短繊維を混練した際に、施工時のファイバーボール等の発生の少ないコンクリート補強用短繊維が得られるので、セメント材料等の補強用途などに好適に使用することができる。 According to the present invention, when reinforcing short fibers are kneaded into a cement material such as mortar and concrete, short fibers for reinforcing concrete with less fiber ball or the like during construction can be obtained. For example, it can be suitably used.
本発明におけるセメント補強用短繊維の繊維としては、炭素繊維、ガラス繊維、セラミック繊維、スチール繊維等の無機繊維、及び、アラミド繊維、ビニロン繊維、ポリプロピレン繊維、ポリエチレン繊維、ポリメチルペンテン繊維、ポリアリレート繊維、Ｐ Ｂ Ｏ繊維、ナイロン繊維、ポリエステル繊維、アクリル繊維、ポリケトン繊維、塩化ビニル繊維、セルロース繊維、パルプ繊維等の有機繊維を任意に使用することが出来る。１種のみ使用することも複数種を併用することも可能である。なかでもポリパラフェニレンテレフタラミドやコポリパラフェニレン・３，４’オキシジフェニレン・テレフタラミド等のパラ型アラミドからなる繊維が他の繊維に比べて補強効果が大きいので好ましく、特にコポリパラフェニレン・３，４’オキシジフェニレン・テレフタラミド短繊維は、高温高圧下強アルカリ性の雰囲気中に長時間保持してもその機械的特性の劣化が小さいので、高温高圧下での蒸気養生、例えば１８０℃、圧力約１０Ｋｇ／ｃｍ２の飽和水蒸気による条件下においても高い強力保持率を有するので好ましい。 In the present invention, the short fiber for reinforcing cement includes inorganic fibers such as carbon fiber, glass fiber, ceramic fiber, and steel fiber, and aramid fiber, vinylon fiber, polypropylene fiber, polyethylene fiber, polymethylpentene fiber, and polyarylate. Organic fibers such as fibers, PBO fibers, nylon fibers, polyester fibers, acrylic fibers, polyketone fibers, vinyl chloride fibers, cellulose fibers, and pulp fibers can be arbitrarily used. It is possible to use only one type or to use a plurality of types in combination. Of these, fibers made of para-aramid such as polyparaphenylene terephthalamide and copolyparaphenylene 3,4'oxydiphenylene terephthalamide are preferable because they have a greater reinforcing effect than other fibers, particularly copolyparaphenylene-3. , 4 'oxydiphenylene terephthalamide short fiber is less deteriorated in mechanical properties even when kept in a strong alkaline atmosphere under high temperature and high pressure for a long time. Steam curing under high temperature and high pressure, for example, 180 ° C, pressure It is preferable because it has a high strength retention even under a condition of saturated steam of about 10 kg / cm 2 .
本発明のセメント補強用短繊維はセメント補強効果を有するものであれば特に限定されるものではないが、引張弾性率（単位：ＧＰａ）は４５ＧＰａ以上であるものが好ましい。４５ＧＰａ未満では、後述の繊度の範囲でも繊維の剛性が低くなるため、セメントに混練時に容易に繊維同士が絡まり易くファイバーボールや塊り状になりやすい。短繊維の引張弾性率は、好ましくは５０〜３００ＧＰａ、より好ましくは７０ＧＰａ〜１００ＧＰａである。３００ＧＰａを超える場合は繊維が硬すぎて攪拌中に繊維が折れる場合があるので好ましくない。 The short fiber for cement reinforcement of the present invention is not particularly limited as long as it has a cement reinforcing effect, but preferably has a tensile elastic modulus (unit: GPa) of 45 GPa or more. If it is less than 45 GPa, the rigidity of the fiber is low even in the range of fineness described later, so that the fibers are easily entangled with each other when kneaded with the cement, and are likely to become a fiber ball or a lump. The tensile elastic modulus of the short fiber is preferably 50 to 300 GPa, more preferably 70 GPa to 100 GPa. If it exceeds 300 GPa, the fiber is too hard and the fiber may break during stirring, which is not preferable.
本発明の補強用短繊維の繊維長は６ｍｍ以上であることが必要で、６ｍｍ未満であればセメントの補強効果が少なく好ましくない。好ましくは６〜６０ｍｍ、より好ましくは６〜４０ｍｍである。 The fiber length of the reinforcing short fiber of the present invention needs to be 6 mm or more, and if it is less than 6 mm, the reinforcing effect of the cement is small, which is not preferable. Preferably it is 6-60 mm, More preferably, it is 6-40 mm.
又そのアスペクト比は４０〜４００であることが必要である。ここでアスペクト比とは、（繊維長）／（繊維長さ方向に直交する断面における直径）で表されるものである。アスペクト比が４０未満であれば分散性が良好（繊維の塊りやファイバーボールの発生が少ない）であるがセメント補強効果が少なく好ましくない。又４００を超える場合は絡まり易くなり繊維塊りができ易く好ましくない。 Moreover, the aspect ratio needs to be 40-400. Here, the aspect ratio is expressed by (fiber length) / (diameter in a cross section perpendicular to the fiber length direction). If the aspect ratio is less than 40, the dispersibility is good (the occurrence of fiber clumps and fiber balls is small), but the cement reinforcing effect is small and not preferable. On the other hand, if it exceeds 400, it tends to be entangled and fiber lump is easily formed, which is not preferable.
本発明においては、短繊維集合体の嵩密度が５ｍｌ／ｇ以下であることが重要である。この値が５ｍｌ／ｇを超える場合は繊維同士がかさばり易くファイバーボールができやすい。好ましくは０．１〜５ｍｌ／ｇである。
上記の条件を満足する本発明の短繊維をセメントと混練しても分散性良好で繊維塊りやファイバーボールの発生がほとんどなくセメント補強効果も良好である。
In the present invention, it is important that the short fiber aggregate has a bulk density of 5 ml / g or less. When this value exceeds 5 ml / g, the fibers tend to be bulky and a fiber ball is likely to be formed. Preferably it is 0.1-5 ml / g.
Even when the short fibers of the present invention satisfying the above conditions are kneaded with cement, the dispersibility is good and there is almost no generation of fiber lumps or fiber balls, and the cement reinforcing effect is also good.
以下、本発明を実施例及び比較例により更に詳細に説明する。なお、実施例及び比較例で用いた物性の測定方法は下記の通りである。
（１）繊維長、繊度
ＪＩＳ−Ｌ−１０１５に準拠して測定した。
（２）アスペクト比
繊維長／繊維長さ方向に直交する断面における直径
（３）ファイバーボール発生の有無の評価
普通ポルトランドセメント１，５００ｇ、水６３０ｇ、及びセメント材料に対する容積対比２％の補強用繊維を、オムニミキサー（ＧＡＲＢＲＯ社製、型式：ＯＭ−１０−Ｅ、容量：１０Ｌ）を用いて４００ｒｐｍの撹拌速度で約３分間混練し、ペーストを得た。次いで、水平に配置した５０ｃｍ角のアルミ板にミニスランプコーン（高さ１５ｃｍ、下面内径１０ｃｍ、上面内径５ｃｍの内側がくり貫かれた円錐柱）に得られたペーストを摺り切りで注ぎ入れ、ミニスランプコーンをゆっくり垂直に引き上げる。このときのセメントペーストはアルミ板上に円形に広がる。このときの広がった円形のペーストを目視し、ファイバーボールが発生したか目視で判断する。
（４）短繊維集合体の嵩密度の測定
ファイバーボールの発生の有無の評価を行う際に使用した補強用短繊維と同重量の補強用繊維を、タッピング式粉体減少度測定（筒井理化学機器株式会社、型式：ＴＰＭ−１）を用いて、直径３０ｍｍの１５０ｍｌ測定用のメスシリンダーに投入し、１００ｇの荷重をかけて、タッピング幅３２ｍｍとして２００回の振動を与えた後の短繊維体積量を測定し、重量で除して嵩密度（ｍｌ／ｇ）を求めた。
Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. In addition, the measuring method of the physical property used by the Example and the comparative example is as follows.
(1) Fiber length and fineness Measured according to JIS-L-1015.
(2) Aspect ratio Fiber length / diameter in cross section perpendicular to fiber length direction (3) Evaluation of presence or absence of generation of fiber ball Reinforcement fiber of ordinary portland cement 1,500 g, water 630 g, and 2% by volume of cement material Was kneaded for about 3 minutes at a stirring speed of 400 rpm using an omni mixer (manufactured by GARBRO, model: OM-10-E, capacity: 10 L) to obtain a paste. Next, the paste obtained in a mini slump cone (15 cm in height, 10 cm in the lower surface inner diameter, 5 cm in the inner surface of the upper surface inner diameter) is poured into a horizontally-arranged 50 cm square aluminum plate. Slowly pull the slump cone vertically. The cement paste at this time spreads circularly on the aluminum plate. At this time, the spread circular paste is visually observed, and it is visually determined whether a fiber ball is generated.
(4) Measurement of bulk density of short fiber aggregate Tapping-type powder reduction measurement (Tsutsui Rikagakuki) Co., Ltd .: Model: TPM-1), put into a measuring cylinder of 150 ml with a diameter of 30 mm, apply a load of 100 g, give a tapping width of 32 mm, and give 200 times of vibration to the short fiber volume. Was measured and divided by weight to determine the bulk density (ml / g).
［実施例１］
補強用ポリエステル繊維（帝人ファイバー（株）製、断面径０．３３ｍｍ 長さ１２ｍｍ、アスペクト比４０、密度１．４ｇ／ｃｍ３）を２８ｇ投入し、短繊維体積量を測定すると１１６ｍｌで、短繊維嵩密度は４．１４（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールは無かった。
[Example 1]
28 g of reinforcing polyester fiber (made by Teijin Fibers Ltd., cross-sectional diameter: 0.33 mm, length: 12 mm, aspect ratio: 40, density: 1.4 g / cm 3 ) was added and the short fiber volume was measured to be 116 ml. The bulk density was 4.14 (ml / g). As a result of evaluating the presence of fiber balls for the short fibers having the same weight, there were no fiber balls.
［比較例１］
実施例１において、補強用ポリエステル繊維（帝人ファイバー（株）製、断面径０．２ｍｍ、長さ１２ｍｍ、アスペクト比６０ 密度１．４ｇ／ｃｍ３）を２８ｇ投入した以外は実施例１と同じ操作をおこなった。短繊維体積量を測定すると１５０ｍｌで、短繊維嵩密度は５．３５（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールは存在した。
[Comparative Example 1]
In Example 1, the same operation as Example 1 was carried out except that 28 g of reinforcing polyester fiber (manufactured by Teijin Fibers Ltd., cross-sectional diameter 0.2 mm, length 12 mm, aspect ratio 60 density 1.4 g / cm 3 ) was added. I did it. When the short fiber volume was measured, the short fiber volume density was 150 ml and the short fiber bulk density was 5.35 (ml / g). As a result of evaluating the short fibers of the same weight, the presence of fiber balls was found.
［実施例２］
補強用ポリビニルアルコール繊維（断面径０．２ｍｍ、長さ１５ｍｍ、アスペクト比７５、密度１．３ｇ／ｃｍ３ クラレ株製）を２６ｇ投入し、短繊維体積量を測定すると１１２ｍｌで、短繊維嵩密度は４．３１（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールは無かった。
[Example 2]
26 g of reinforcing polyvinyl alcohol fiber (cross-sectional diameter 0.2 mm, length 15 mm, aspect ratio 75, density 1.3 g / cm 3 manufactured by Kuraray Co., Ltd.) was added and the short fiber volume was measured to be 112 ml. Was 4.31 (ml / g). As a result of evaluating the presence of fiber balls for the short fibers having the same weight, there was no fiber ball.
［実施例３］
補強用鋼繊維（断面径０．２ｍｍ 長さ１５ｍｍ、アスペクト比７５、密度７．９ｇ／ｃｍ３）を１５８ｇ投入し、短繊維体積量を測定すると１１０ｍｌで、短繊維嵩密度は０．６９（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールは無かった。
[Example 3]
158 g of reinforcing steel fiber (cross-sectional diameter 0.2 mm, length 15 mm, aspect ratio 75, density 7.9 g / cm 3 ) was added and the short fiber volume was measured to be 110 ml, and the short fiber bulk density was 0.69 ( ml / g), and short fibers having the same weight were evaluated for the presence or absence of fiber balls. As a result, no fiber balls were found.
［実施例４］
補強用パラ型アラミド繊維（断面径０．０２１ｍｍ 長さ６ｍｍ、アスペクト比２８６密度１．３９ｇ／ｃｍ３ 帝人テクノプロダクツ製 テクノーラ）を２７．８ｇ投入し、短繊維体積量を測定すると１２０ｍｌで、短繊維嵩密度は４．３２（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールは無かった。
[Example 4]
27.8 g of para-aramid fiber for reinforcement (cross-sectional diameter 0.021 mm length 6 mm, aspect ratio 286 density 1.39 g / cm 3 Teijin Techno Products Technora) was added, and the short fiber volume was 120 ml. The fiber bulk density was 4.32 (ml / g). As a result of evaluating the presence or absence of the fiber ball for the short fiber having the same weight, there was no fiber ball.
［比較例２］
補強用ポリビニルアルコール繊維（断面径０．１ｍｍ 長さ１２ｍｍ、アスペクト比１２０、密度１．３ｇ／ｃｍ３ クラレ株製）を２６ｇ投入し、短繊維体積量を測定すると１５４ｍｌで、短繊維嵩密度は５．９２（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールが発生していた。
[Comparative Example 2]
26 g of reinforcing polyvinyl alcohol fiber (cross-sectional diameter 0.1 mm, length 12 mm, aspect ratio 120, density 1.3 g / cm 3 manufactured by Kuraray Co., Ltd.) was added and the short fiber volume was measured to be 154 ml. It was 5.92 (ml / g), and as a result of evaluating the presence or absence of fiber balls for the short fibers having the same weight, fiber balls were generated.
［比較例３］
補強用パラ型アラミド繊維（断面径０．０１２ｍｍ 長さ７ｍｍ、アスペクト比５８０ 密度１．３９ｇ／ｃｍ３ 帝人テクノプロダクツ製 テクノーラ）を２７．８ｇ投入し、短繊維体積量を測定すると１５４ｍｌで、短繊維嵩密度は７．９１（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールが発生していた。
[Comparative Example 3]
27.8 g of para-aramid fiber for reinforcement (cross-sectional diameter 0.012 mm length 7 mm, aspect ratio 580 density 1.39 g / cm 3 Teijin Techno Products Technora) was added, and the short fiber volume was 154 ml. The fiber bulk density was 7.91 (ml / g). As a result of evaluating the presence or absence of the fiber ball for the short fiber having the same weight, a fiber ball was generated.
［比較例４］
補強用パラ型アラミド繊維（断面径０．０２１ｍｍ 長さ７ｍｍ、アスペクト比３３３、密度１．３９ｇ／ｃｍ３ 帝人テクノプロダクツ製 テクノーラ）を２７．８ｇ投入、短繊維体積量を測定すると１４０ｍｌで、短繊維嵩密度は５．０３（ｍｌ／ｇ）であり、同重量の短繊維についてファイバーボール有無の評価を行った結果、ファイバーボールが発生していた。
[Comparative Example 4]
27.8 g of para-aramid fiber for reinforcement (cross-sectional diameter 0.021 mm, length 7 mm, aspect ratio 333, density 1.39 g / cm 3 Technora made by Teijin Techno Products) was input, and the short fiber volume was 140 ml. The fiber bulk density was 5.03 (ml / g), and as a result of evaluating the presence or absence of fiber balls for short fibers of the same weight, fiber balls were generated.
本発明によれば、モルタル、コンクリート等のセメント材料に補強用短繊維を混練した際に、施工時の作業性を阻害しないコンクリート補強用短繊維が得られるので、セメント材料等の補強用途などに好適に使用することができる。 According to the present invention, when reinforcing short fibers are kneaded with cement material such as mortar and concrete, short fibers for concrete reinforcing that do not impair workability during construction can be obtained. It can be preferably used.
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| JP2008154069A JP2009298636A (en) | 2008-06-12 | 2008-06-12 | Staple fiber for reinforcing cement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| ES2361433A1 (en) * | 2009-11-12 | 2011-06-17 | Lisardo Gonzalez Abelleira | Reinforced concrete structure (Machine-translation by Google Translate, not legally binding) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2361433A1 (en) * | 2009-11-12 | 2011-06-17 | Lisardo Gonzalez Abelleira | Reinforced concrete structure (Machine-translation by Google Translate, not legally binding) |
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