JP5378754B2 - Polymer cement composition - Google Patents

Polymer cement composition Download PDF

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JP5378754B2
JP5378754B2 JP2008276794A JP2008276794A JP5378754B2 JP 5378754 B2 JP5378754 B2 JP 5378754B2 JP 2008276794 A JP2008276794 A JP 2008276794A JP 2008276794 A JP2008276794 A JP 2008276794A JP 5378754 B2 JP5378754 B2 JP 5378754B2
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cement composition
polymer cement
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JP2010105831A (en
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丈也 出井
定光 村山
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Teijin Ltd
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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
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72—Repairing or restoring existing buildings or building materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polymer cement composition which is easily manufactured on site, has such flowability that the workability is not disturbed in construction and gives high strength and high toughness. <P>SOLUTION: Disclosed is the polymer cement composition containing cement, water, aggregate, a polymer and a high strength short fiber having &ge;20 cN/dtex tensile strength, wherein 1-20 pts.mass of the polymer is blended based on 100 pts.mass of the cement, and the high strength short fiber contained in the polymer cement composition has a fiber length of 1-18 mm, single yarn fineness of 0.3-10 dtex and a mixing rate of 0.1-5 vol.%. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、ポリマーセメント組成物に関し、特に、塩害、凍害、中性化、アルカリ骨材反応などによる種々のコンクリート構造物劣化部に充填して補修する用途に好適な、ポリマーセメント組成物に関するものである。   The present invention relates to a polymer cement composition, and more particularly to a polymer cement composition suitable for use in filling and repairing various degraded parts of concrete structures due to salt damage, frost damage, neutralization, alkali aggregate reaction, and the like. It is.

従来から、コンクリート構造物の柱、床、壁、及び梁等に対して、その断面の劣化部分のかぶり部を除去し、鉄筋を露出させ、その除去部分に、短繊維補強セメント系複合材料を、吹き付けたり、塗り付ける補修工法が適用されている。   Conventionally, for concrete pillars, floors, walls, beams, etc., the cover of the deteriorated part of the cross section is removed, the reinforcing bars are exposed, and the short fiber reinforced cementitious composite material is applied to the removed part. The repair method of spraying or painting is applied.

特開２００２−１９３６５３号公報（特許文献１参照）では、ポリビニルアルコール短繊維をモルタルに混合した引張、曲げ靭性の高い吹き付け材料が提案されている。しかしながら、この材料では、必要性能を発現させるために、ポリビニルアルコール短繊維混入量を増加させなければならず、均一な繊維の分散を得るために攪拌力の強い強制練りミキサーの使用、定められた短繊維混合方法といった規定の製造工程が必要であった。   Japanese Patent Application Laid-Open No. 2002-193653 (see Patent Document 1) proposes a spray material having high tensile and bending toughness in which polyvinyl alcohol short fibers are mixed with mortar. However, in this material, in order to express the required performance, the amount of polyvinyl alcohol short fibers mixed must be increased, and in order to obtain uniform fiber dispersion, the use of a forced kneading mixer with a strong stirring force was determined. A specific manufacturing process such as a short fiber mixing method was required.

特開２００４−３１５２５１号公報（特許文献２参照）では、特定の高い引張強度等を有する有機短繊維を使用し、比較的低い繊維混入率で高い強度及び靭性が付与されたセメント複合体を得ている。低い繊維混入率のため、特殊な混合ミキサーを使用しなくても製造が可能となったが、均一な繊維分散を得る目的で、繊維の添加手順が規定されるため、製造方法が煩雑となり、製造手順の違いによりモルタルの物性に影響を及ぼす可能性がある。   JP-A-2004-315251 (see Patent Document 2) uses a short organic fiber having a specific high tensile strength and the like to obtain a cement composite having high strength and toughness with a relatively low fiber mixing rate. ing. Due to the low fiber mixing rate, it became possible to manufacture without using a special mixing mixer, but for the purpose of obtaining a uniform fiber dispersion, the fiber addition procedure is prescribed, so the manufacturing method becomes complicated, The physical properties of the mortar may be affected by differences in the manufacturing procedure.

また、従来のセメント複合体においては、上記補強用短繊維の力学性能が低いため、高い強度を得るためには、３容積％以上の繊維混入率が必要であり、多量の繊維を均一に分散させるためには、増粘剤の投与、攪拌力の強い特殊ミキサーの使用、さらには、練り混ぜ水に予め繊維を均一に分散させてからセメント、砂と練り混ぜるといった複雑な製造工程が必要であった。また、高強度且つ高靱性のセメント複合体とするため、モルタルの強度が高くなると、その強力に繊維が対応しきれず、繊維自身の引張強度が限界に達し、モルタル破断面で繊維も破断するため、高い靱性を得ることが困難であった。
そこで、このような問題点を解決したポリマーセメント組成物の開発が望まれていた。
特開２００２−１９３６５３号公報 特開２００４−３１５２５１号公報 In addition, in the conventional cement composite, the mechanical performance of the reinforcing short fibers is low, so in order to obtain high strength, a fiber mixing rate of 3% by volume or more is necessary, and a large amount of fibers are uniformly dispersed. In order to achieve this, it is necessary to administer a thickener, use a special mixer with strong agitation power, and further complex processes such as dispersing the fibers uniformly in the kneading water before mixing with cement and sand. there were. In addition, because the cement composite has high strength and high toughness, when the strength of the mortar is high, the fiber cannot fully handle the strength, the tensile strength of the fiber itself reaches the limit, and the fiber breaks at the mortar fracture surface. It was difficult to obtain high toughness.
Therefore, development of a polymer cement composition that solves such problems has been desired.
JP 2002-193653 A JP 2004-315251 A

本発明の目的は、上記問題点を解決し、現場での製造が容易で施工時の作業性を阻害することのない流動性を有し、劣化コンクリート部との接着性が良好で、且つ成形物が高強度・高靱性を有するポリマーセメント組成物を提供することである。   The object of the present invention is to solve the above-mentioned problems, have fluidity that is easy to manufacture on-site and does not impair workability during construction, has good adhesion to a deteriorated concrete part, and is molded. The object is to provide a polymer cement composition having high strength and high toughness.

本発明者らは、鋭意検討を重ねた結果、セメントに特定のポリマーおよびポリパラフェニレン・テレフタラアミド短繊維を特定の配合組成で組み合わせることで、上記問題点が解決できることを見出し、本発明を完成するに至った。 As a result of intensive studies, the present inventors have found that the above problems can be solved by combining a specific polymer and polyparaphenylene terephthalamide short fibers with a specific composition in cement. It came to be completed.

即ち、本発明によれば、
セメント、水、骨材、ポリマー、および引張強度が２０ｃＮ／ｄｔｅｘ以上で、且つ密度が１ｇ／ｃｍ３以上、破断伸度が３〜８％範囲内であるポリパラフェニレン・テレフタラアミド短繊維を含有してなるポリマーセメント組成物であって、下記要件を満足することを特徴とするポリマーセメント組成物。
ａ）ポリマー配合量がセメント１００質量部に対し、１〜２０質量部であること。
ｂ）高強力短繊維の繊維長が１〜１８ｍｍ、単糸繊度が０．３〜１０ｄｔｅｘであること。
ｃ）高強力短繊維の混入率がポリマーセメント組成物全容積に対し０．１〜５．０容積％であること。
又好ましくはポリパラフェニレン・テレフタラアミド短繊維がコポリパラフェニレン・３，４’−オキシジフェニレン・テレフタラアミド短繊維であるポリマーセメント組成物、
が提供される。 That is, according to the present invention,
Cement, water, aggregate, polymer, and polyparaphenylene terephthalamide short fiber having a tensile strength of 20 cN / dtex or more, a density of 1 g / cm 3 or more, and a breaking elongation of 3 to 8%. A polymer cement composition comprising: a polymer cement composition satisfying the following requirements:
a) The polymer content is 1 to 20 parts by mass with respect to 100 parts by mass of cement.
b) The high-strength short fiber has a fiber length of 1 to 18 mm and a single yarn fineness of 0.3 to 10 dtex.
c) The mixing rate of high-strength short fibers is 0.1 to 5.0% by volume with respect to the total volume of the polymer cement composition.
Further preferably polyparaphenylene-terephthalamide amide short fibers co polyparaphenylene-3,4'-diphenylene-terephthalamide amide polymer cement composition is a short fiber,
Is provided.

本発明のポリマーセメント組成物により、現場での製造が容易であって、施工時の作業性を阻害することのない流動性を有し、コンクリート補強工法において劣化下地との接着性が良好で高い曲げ強度と高い靱性を有する組成物が得られる。   The polymer cement composition of the present invention is easy to manufacture on site, has fluidity that does not hinder workability during construction, and has high adhesion to a deteriorated base in a concrete reinforcing method. A composition having bending strength and high toughness is obtained.

本発明を以下の好適例により説明するが、これらに限定されるものではない。
本発明でいうポリマーセメントとは、結合材にセメントとポリマーを用いたセメント系複合材料をいい、組成物がセメント、水、およびポリマーであるときはポリマーセメントペーストと称し、セメント、水、ポリマー、および細骨材であるときはポリマーセメントモルタルと称し、セメント、水、ポリマー、細骨材、および粗骨材であるときはポリマーセメントコンクリートと称し、ポリマーセメント組成物に水が含まれないものをプレミクスポリマーセメントと称する。 The present invention is illustrated by the following preferred examples, but is not limited thereto.
The polymer cement as used in the present invention refers to a cement-based composite material using cement and a polymer as a binder, and when the composition is cement, water, and polymer, it is referred to as a polymer cement paste, and cement, water, polymer, When it is fine aggregate, it is called polymer cement mortar, and when it is cement, water, polymer, fine aggregate, and coarse aggregate, it is called polymer cement concrete, and the polymer cement composition does not contain water. It is called premix polymer cement.

本発明のポリマーセメント組成物に用いるセメントとしては、現場の施工条件等を考慮して選定することができ、特に限定されず、例えば普通、早強、超早強、低熱、及び中庸熱等の各種ポルトランドセメントや、これらの各種ポルトランドセメントにフライアッシュや高炉スラグなどを混合した高炉セメント等の各種混合セメント、速硬セメント等を、単独または２種以上で用いることができる。   The cement used in the polymer cement composition of the present invention can be selected in consideration of on-site construction conditions and the like, and is not particularly limited. For example, normal, early strength, super early strength, low heat, and moderate heat Various Portland cements, various mixed cements such as blast furnace cement obtained by mixing fly ash, blast furnace slag, and the like with these various Portland cements, fast-hardening cements, and the like can be used alone or in combination of two or more.

また、該セメントには、高炉スラグ粉末、フライアッシュ、シリカヒューム、石灰石粉末、石英粉末、二水石膏、半水石膏、無水石膏、生石灰系膨張材、カルシウムサルフォアルミネート系膨張材などの公知の混和材を添加することができる。その配合割合は、特に限定されず、適宜設計することができる。   Further, the cement includes known blast furnace slag powder, fly ash, silica fume, limestone powder, quartz powder, dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum, quick lime-based expansion material, calcium sulfoaluminate-based expansion material, and the like. Of admixture can be added. The mixing ratio is not particularly limited and can be appropriately designed.

本発明のポリマーセメント組成物は、セメント、水、骨材、ポリマー、および引張強度が２０ｃＮ／ｄｔｅｘ以上のポリパラフェニレン・テレフタラアミド短繊維を含有してなるポリマーセメント組成物であって、セメント１００質量部に対し、ポリマー１〜２０質量部配合されていることが必要である。 The polymer cement composition of the present invention is a polymer cement composition comprising cement, water, aggregate, polymer, and polyparaphenylene terephthalamide short fibers having a tensile strength of 20 cN / dtex or more. It is necessary that 1 to 20 parts by mass of the polymer is blended with respect to 100 parts by mass.

ポリマーセメント組成物に使用するポリマーとしては、ポリアクリル酸エステル、スチレンブタジエン、エチレン酢酸ビニル、酢酸ビニル／バーサック酸ビニルエステル、酢酸ビニル／バーサック酸ビニルエステル／アクリル酸エステル等の樹脂が挙げられ、これらの中から適宜、選択して単独、または１種以上を混合して使用することができる。また、該ポリマーは、その使用形態については限定されない。従って、例えばディスパージョン状態となったものを現場において施工直前に混合するものや、該ポリマーを再乳化型の粉末として予めセメント等と混合しておき、水を添加して混練する際にディスパージョン状態となるものなど、いずれの形態でも使用することができる。   Examples of the polymer used in the polymer cement composition include resins such as polyacrylic acid ester, styrene butadiene, ethylene vinyl acetate, vinyl acetate / versacic acid vinyl ester, vinyl acetate / versacic acid vinyl ester / acrylic acid ester, and the like. These can be appropriately selected and used alone or in combination of one or more. Further, the polymer is not limited in its usage form. Therefore, for example, what is in a dispersion state is mixed immediately before construction at the site, and when the polymer is mixed with cement or the like in advance as a re-emulsifying type powder, and dispersion is performed when water is added and kneaded. It can be used in any form such as a state.

該ポリマーの配合割合は、セメント１００質量部に対して、１〜２０質量部となるようにすることが必要である。ポリマーを上記範囲の適正量配合することにより組成物が施工に適した粘度、粘性を有するとともに、補強用高強力短繊維が均一に分散する効果を有する。ポリマー配合量が１質量部より少なければ、粘度が低く高強力短繊維が絡まり易くなり補強効果が低下するとともに、コンクリートとの付着性能、乾燥収縮抑制性能が十分に発揮できない。逆に２０質量部を超えるとモルタル練上り直後、いわゆる、フレッシュ時の粘度が高くなりすぎ流動性が低下し好ましくない。好ましくは２〜１５質量部、更に好ましくは３〜１０質量部であることが望ましい。   The blending ratio of the polymer needs to be 1 to 20 parts by mass with respect to 100 parts by mass of cement. By blending an appropriate amount of the polymer in the above range, the composition has a viscosity and viscosity suitable for construction, and has an effect of uniformly dispersing high-strength short fibers for reinforcement. If the amount of the polymer is less than 1 part by mass, the low-viscosity and high-strength short fibers are easily entangled and the reinforcing effect is deteriorated, and the adhesion performance with concrete and the drying shrinkage suppression performance cannot be sufficiently exhibited. On the other hand, if it exceeds 20 parts by mass, the so-called fresh viscosity becomes too high immediately after the mortar is kneaded, and the fluidity is lowered. Preferably it is 2-15 mass parts, More preferably, it is 3-10 mass parts.

本発明のポリマーセメント組成物に使用する骨材としては、川砂、海砂、山砂、砕砂、３〜８号珪砂、石灰石、及びスラグ細骨材等の細骨材のみや、用途の要求特性に応じて、川砂利、砕石、及び人工骨材等の粗骨材を混合使用することができる。高物性を発現させるためには、微細な粉や粗い骨材を含まない粒度調整した珪砂や石灰石等の細骨材のみを用いるほうが好ましい。   Aggregates used in the polymer cement composition of the present invention include only fine aggregates such as river sand, sea sand, mountain sand, crushed sand, No. 3-8 silica sand, limestone, and slag fine aggregate, and required characteristics of the application. Depending on the condition, coarse aggregates such as river gravel, crushed stone, and artificial aggregate can be mixed and used. In order to express high physical properties, it is preferable to use only fine aggregates such as silica sand and limestone whose particle size is adjusted without containing fine powder or coarse aggregates.

さらに、所望の特性のセメント硬化体を得るためには、その粒度構成や配合割合にも好適な範囲があり、骨材の粒度は４ｍｍ以下のものが好ましく、１．２ｍｍ未満のものが４０〜７５％で、１．２〜４ｍｍのものが６０〜２５％である混合物がより好ましく、１．２ｍｍ未満のものが５５〜７０％で、１．２〜４ｍｍのものが４５〜３０％である混合物が最も好ましい。最大粒度が４ｍｍを超えると流動性や充填性が不足し、１．２〜４ｍｍものが２５％未満では耐久性に劣る場合があり、６０％を超えると必要な早期強度が得られなく好ましくない。   Furthermore, in order to obtain a hardened cement body having desired characteristics, the particle size constitution and blending ratio also have a suitable range, and the aggregate particle size is preferably 4 mm or less, and less than 1.2 mm is 40 to 40 mm. More preferred is a mixture of 75%, 1.2-4 mm and 60-25%, less than 1.2 mm is 55-70%, and 1.2-4 mm is 45-30%. Mixtures are most preferred. When the maximum particle size exceeds 4 mm, fluidity and filling properties are insufficient, and when 1.2 to 4 mm is less than 25%, the durability may be inferior. When it exceeds 60%, the necessary early strength cannot be obtained, which is not preferable. .

骨材の配合割合は、上記セメント１００質量部に対して、５０〜４００質量部、好ましくは１００〜３００質量部とすることが望ましい。これは、かかる配合比で細骨材を混合することより、作業性が良く、実用的な強度発現性を有し、実用上問題のない硬化収縮を有する補修材料となるからである。細骨材がセメントに対して５０質量部未満では、乾燥収縮や水和熱によるひび割れが発生するおそれがあり、また、４００質量部を超えると、充分な流動性を確保できず、強度発現性にも支障の出るおそれがある。   The mixing ratio of the aggregate is 50 to 400 parts by mass, preferably 100 to 300 parts by mass with respect to 100 parts by mass of the cement. This is because, by mixing fine aggregates at such a blending ratio, the workability is improved, a practical strength development property is obtained, and a repair material having curing shrinkage having no practical problem is obtained. If the fine aggregate is less than 50 parts by mass with respect to the cement, there is a possibility that cracking due to drying shrinkage or heat of hydration may occur. If it exceeds 400 parts by mass, sufficient fluidity cannot be ensured and strength development is achieved. There is also a risk of trouble.

本発明のポリマーセメント組成物において、混入されるポリパラフェニレン・テレフタラアミド短繊維としては、密度が１ｇ／ｃｍ３以上であることが好ましく、ポリパラフェニレン・テレフタラアミド短繊維の密度が１ｇ／ｃｍ３未満であれば、練り混ぜ水と共に混ぜた場合に繊維が浮いてしまい、所定の分散性が得られず、ポリマーセメント組成物の流動性が低下する恐れがあり好ましくない。 In the polymer cement composition of the present invention, the mixed polyparaphenylene terephthalamide short fibers preferably have a density of 1 g / cm 3 or more, and the density of the polyparaphenylene terephthalamide short fibers is 1 g. If it is less than / cm 3 , the fibers float when mixed with kneading water, and the predetermined dispersibility cannot be obtained, and the fluidity of the polymer cement composition may be lowered.

ポリパラフェニレン・テレフタラアミド短繊維の繊維長が１〜１８ｍｍ、単糸繊度が０．３〜１０ｄｔｅｘであることが、繊維混入による補強効果、即ち高強度・高靱性付与の観点から必要である。 The fiber length of the polyparaphenylene terephthalamide short fiber is 1 to 18 mm, and the single yarn fineness is 0.3 to 10 dtex from the viewpoint of reinforcing effect due to fiber mixing, that is, high strength and high toughness. .

ポリパラフェニレン・テレフタラアミド短繊維の繊維長が１ｍｍ未満の場合、強度、靱性において繊維添加による補強効果が得られず好ましくない。また、１８ｍｍを超えると混練中に短繊維同士が絡んだり細かく折れたりして施工性を阻害したり、繊維添加による期待した補強効果が得られない場合が生じる。最も好ましくは３ｍｍ〜１２ｍｍの範囲である。 When the fiber length of the polyparaphenylene terephthalamide short fiber is less than 1 mm, the reinforcing effect by adding the fiber cannot be obtained in strength and toughness, which is not preferable. On the other hand, if it exceeds 18 mm, short fibers may be entangled or finely broken during kneading to impair workability, or the expected reinforcing effect due to the addition of fibers may not be obtained. Most preferably, it is in the range of 3 mm to 12 mm.

また、単糸繊度が０．３ｄｔｅｘ未満では、セメントがアルカリ性であるために繊維の芯近くまで劣化が起こってその引っ張り強度の低下が大きくなり、目的の補強効果が得られなくなる場合がある。一方、１０ｄｔｅｘを超えると、繊維の細部への行き渡りが不十分となり、かつ、同じ体積含有率で短繊維を添加する場合、単繊維本数が少なくなって充分な補強効果が得られない。好ましくは単糸繊度は、０．７５〜５ｄｔｅｘである。   On the other hand, when the single yarn fineness is less than 0.3 dtex, the cement is alkaline, so that the fiber is deteriorated to the vicinity of the core of the fiber and the tensile strength is greatly reduced, and the desired reinforcing effect may not be obtained. On the other hand, when it exceeds 10 dtex, the spread to the details of the fibers becomes insufficient, and when the short fibers are added with the same volume content, the number of single fibers decreases and a sufficient reinforcing effect cannot be obtained. The single yarn fineness is preferably 0.75 to 5 dtex.

本発明のポリマーセメント組成物において、混入される補強用ポリパラフェニレン・テレフタラアミド短繊維としては、該繊維の引張強度が２０ｃＮ／ｄｔｅｘ以上であることが必要で、破断伸度が３〜６％範囲内であることが好ましい。 In the polymer cement composition of the present invention, the reinforcing polyparaphenylene terephthalamide short fiber to be mixed is required to have a tensile strength of 20 cN / dtex or more and a breaking elongation of 3 to 6 % Is preferable.

ポリパラフェニレン・テレフタラアミド短繊維の引張強度が２０ｃＮ／ｄｔｅｘ未満ではセメント複合体の強度が十分でなく、また、該繊維の破断伸度が３％未満ではセメント複合体の靱性が低下し好ましくない。また、破断伸度が６％を超えると母材であるポリマーセメントモルタル（含むコンクリート）との伸度差が大きくなりすぎ、かつ、伸びによる単繊維の太さの減少によってセメント破断面近辺での界面接着部で部分的な剥離が生じ易くなって補強効果を充分に発現できなくなる。 If the tensile strength of the polyparaphenylene terephthalamide short fiber is less than 20 cN / dtex, the strength of the cement composite is not sufficient, and if the elongation at break of the fiber is less than 3%, the toughness of the cement composite is preferably reduced. Absent. In addition, if the elongation at break exceeds 6%, the difference in elongation from the polymer cement mortar (including concrete) that is the base material becomes too large, and the thickness of the single fiber is reduced due to the elongation. Partial peeling easily occurs at the interface bonding portion, and the reinforcing effect cannot be sufficiently exhibited.

又、上記ポリパラフェニレン・テレフタラアミド短繊維の繊維混入率は０．１〜２．５容積％程度であることが必要である。該繊維混入率が０．１容積％未満では強度や靱性が十分ではなく、２．５容積％を超えると、繊維の分散が不完全となり、施工時の作業性を阻害するだけではなく、繊維混入率に見合う補強効果や靭性改善効果が得られなくなるので好ましくない。特に、該繊維混入率は、０．５〜２．０容積％であることが好ましい。 Further, the fiber mixing ratio of the polyparaphenylene terephthalamide short fiber needs to be about 0.1 to 2.5% by volume. If the fiber mixing rate is less than 0.1% by volume, strength and toughness are not sufficient, and if it exceeds 2.5% by volume, fiber dispersion becomes incomplete and not only hinders workability during construction but also fiber. This is not preferable because a reinforcing effect and a toughness improving effect corresponding to the mixing rate cannot be obtained. In particular, the fiber mixing rate is preferably 0.5 to 2.0% by volume.

ここで、本発明における繊維混入率（Ｖｆ：ｆｉｂｅｒ ｖｏｌｕｍｅ ｆｒａｃｔｉｏｎ）は、次式で表される割合（容積％）である。
Ｖｆ＝（Ｖ１／Ｖ２）×１００ 式（１）
（式中、Ｖ１は繊維を含有したポリマーセメント複合体の単位容積（１．０００リットル＝１ｍ３）中に混入されたポリパラフェニレン・テレフタラアミド短繊維の容積（リットル）を示し、Ｖ２は繊維補強ポリマーセメント複合体の単位容積（１．０００リットル＝１ｍ３）を示す。） Here, the fiber mixing ratio (Vf: fiber volume fraction) in the present invention is a ratio (volume%) represented by the following equation.
Vf = (V1 / V2) × 100 Formula (1)
(In the formula, V1 represents the volume (liter) of polyparaphenylene terephthalamide short fibers mixed in the unit volume (1.000 liter = 1 m 3 ) of the polymer cement composite containing the fiber, and V2 represents (The unit volume of the fiber reinforced polymer cement composite is shown (1.000 liter = 1 m 3 ).)

本発明において用いられる補強用ポリパラフェニレン・テレフタラアミド短繊維を挙げることができ、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。 Can be exemplified a reinforcing polyparaphenylene-terephthalamide amide short textiles used in the present invention, para-type such as poly paraphenylene terephthalamide and copoly-para-phenylene-3,4 'oxydiphenylene-Terefutaramido also the name or Aramid fibers are preferable because they have a greater reinforcing effect than other fibers. Particularly, copolyparaphenylene-3,4'oxydiphenylene-terephthalamide short fibers are kept in a strong alkaline atmosphere under high temperature and pressure for a long time. However, since the deterioration of the mechanical properties is small, it is preferable because it has a high strength retention even under conditions of steam curing under high temperature and high pressure, for example, saturated steam at 180 ° C. and a pressure of about 10 Kg / cm 2 .

本発明のポリマーセメント組成物においては、上記材料のほかに、ＡＥ減水剤、高性能ＡＥ減水剤、凝結遅延剤、硬化促進剤、増粘剤、消泡剤、発泡剤、防錆剤、防凍剤、粘土鉱物系チクソ性付与材、着色剤、保水剤等の添加剤を、本発明の目的を実質的に阻害しない範囲で使用することができる。   In the polymer cement composition of the present invention, in addition to the above materials, an AE water reducing agent, a high performance AE water reducing agent, a setting retarder, a curing accelerator, a thickener, an antifoaming agent, a foaming agent, a rust preventive agent, and an antifreeze agent. Additives such as an agent, a clay mineral-based thixotropic agent, a colorant, and a water retention agent can be used within a range that does not substantially impair the object of the present invention.

本発明のポリマーセメント組成物は、それぞれの材料を施工時に混合しても、予め一部を混合してもかまわないが、予め粉末成分を混合した材料と水とを混合することが、施工現場での計量手間や計量ミスをなくす点で好ましい。混合は通常使用されるミキサーであればよく、特に限定されるものではないが、羽根型か、もしくはオムニミキサーが好適であり、繊維プレミクスのポリマーセメントモルタル粉体に所定量の水を投入するだけで調合製造が可能となり、これまでと同等の高い曲げ靭性能が得られるものである。   The polymer cement composition of the present invention may be prepared by mixing each material at the time of construction or by mixing a part of the material in advance. This is preferable in that it eliminates the time and trouble of weighing. Mixing is not particularly limited as long as it is a commonly used mixer, but a blade type or omni mixer is suitable, and a predetermined amount of water is simply added to a polymer cement mortar powder of fiber premix. This makes it possible to prepare and manufacture, and the same high bending toughness performance as before can be obtained.

更に、本発明のモルタルの練り混ぜ水量は、通常、セメント材料１００質量部に対し、水を２５〜５５質量部混合、好ましくは３０〜５０質量部混合される。   Furthermore, the mixing amount of the mortar of the present invention is usually 25 to 55 parts by mass, preferably 30 to 50 parts by mass of water with respect to 100 parts by mass of the cement material.

また、本発明のポリマーセメント組成物は、適量な水を添加して混練するが、水は、セ
メント等の硬化に悪影響を及ぼす成分を含有していなければ、水道水や地下水、河川水等
の水を用いることができ、例えば、「ＪＩＳ Ａ ５３０８ 付属書９ レディーミクス
トコンクリートの練混ぜに用いる水」に適合するものが好ましい。 In addition, the polymer cement composition of the present invention is kneaded by adding an appropriate amount of water. If the water does not contain a component that adversely affects the hardening of cement or the like, tap water, ground water, river water, etc. Water can be used, and for example, one that conforms to “JIS A 5308 Appendix 9 Water for Mixing Ready-Mixed Concrete” is preferable.

このようにして得られたポリマーセメント組成物を用いたモルタルやコンクリートは、建築・土木分野での施工に有用であり、例えば、コンクリート建造物等の劣化部のコンクリートやモルタル部の一部を除去、はつりとった後に、必要に応じて鉄筋の錆びを落とし、必要な厚さの本発明のポリマーセメント組成物を用いて施工することで、その建造物に十分な表面強度と付着性とを付与することができる。   Mortar and concrete using the polymer cement composition obtained in this way is useful for construction in the field of construction and civil engineering, for example, removing concrete and mortar part of deteriorated parts such as concrete buildings. After suspending, remove the rust of the reinforcing bars as necessary, and apply the polymer cement composition of the present invention with the required thickness to give the building sufficient surface strength and adhesion can do.

以下に実施例および比較例を挙げて本発明をより具体的に説明する。
なお、実施例における各種の評価は、次のようにして測定した。
（１）繊維長、繊度
ＪＩＳ−Ｌ−１０１５に準拠して測定した。
（２）ポリマーセメント組成物の混練性
普通ポルトランドセメント（住友大阪セメント株式会社製）、骨材（５号珪砂）水道水、ポリアクリル酸エステル系ポリマーディスパージョン（ニチゴーモビニール株式会社製
）、及び補強用繊維を、モルタルミキサー（(株)マルイ製、ＭＩＣ−３６２型、容量：５Ｌ）を用いて１４０ｒｐｍの撹拌速度で約３分間混練して得られたモルタルの混練性について、繊維の絡まりが無く且つその流動性が施工時の作業を阻害しないときは良好とし、繊維の絡まりがありまたその流動性が施工時の作業を阻害するときは不良とした。
（３）ポリマーセメント組成物曲げ強度、および曲げ強度エネルギー測定方法
幅４０ｍｍ×高さ４０ｍｍ×長さ１６０ｍｍの型枠に、得られた各モルタルを打設し、２０℃、９０％ＲＨで材齢２８日まで養生して、供試体を製造した。上記供試体を、３点曲げ測定法にしたがって測定した。すなわち、１０トン用引張圧縮試験機（ＴＯＹＯ ＢＡＬＤＷＩＮ社製、ＵＮＩＶＥＲＳＡＬ ＴＥＳＴＩＮＧ ＩＮＳＴＲＵＭＥＮＴ ＭＯＤＥＬ ＵＴＭ １０ｔ）を用い、支点間距離１０ｃｍの中心を２ｍｍ／分の速度で圧縮し、応力の最高点より曲げ強度を求めた。また、曲げ応力−歪みの関係から供試体の破壊に必要な破壊エネルギーを算出し、曲げ強度１２Ｎ／ｍｍ２以上で且つ破壊エネルギー５ｋＮ／ｍｍ以上を良好とし、曲げ強度１２Ｎ／ｍｍ２または破壊エネルギー５ｋＮ／ｍｍ以下を不良とした。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
Various evaluations in the examples were measured as follows.
(1) Fiber length and fineness Measured according to JIS-L-1015.
(2) Kneadability of polymer cement composition Ordinary Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.), aggregate (No. 5 silica sand) tap water, polyacrylate polymer dispersion (manufactured by Nichigomo Vinyl Co., Ltd.), and About the kneadability of the mortar obtained by kneading the reinforcing fiber for about 3 minutes at a stirring speed of 140 rpm using a mortar mixer (manufactured by Marui, MIC-362 type, capacity: 5 L) It was judged good when it did not hinder the work at the time of construction and when it was entangled and the fluidity hindered the work at the time of construction.
(3) Polymer cement composition bending strength and bending strength energy measurement method Each obtained mortar was placed in a mold having a width of 40 mm, a height of 40 mm, and a length of 160 mm, and the material age was 20 ° C. and 90% RH. The specimens were produced by curing until the 28th. The specimen was measured according to a three-point bending measurement method. That is, using a 10-ton tensile / compression tester (made by TOYO BALDWIN, UNIVERSAL TESTING INSTRUMENT MODEL UTM 10t), compress the center at a distance of 10 cm between fulcrums at a speed of 2 mm / min, and obtain the bending strength from the highest point of stress. It was. Also, the fracture energy required for breaking the specimen is calculated from the relationship between the bending stress and strain, the bending strength is 12 N / mm 2 or more and the breaking energy is 5 kN / mm or more, and the bending strength is 12 N / mm 2 or the breaking energy. 5 kN / mm or less was regarded as defective.

［実施例１］
表１に示す配合割合でポリマーセメントモルタルを調整し、短繊維としてアラミド繊維（帝人テクノプロダクツ株式会社製「テクノーラ」（密度１．３９ｇ／ｃｍ３、単糸繊度１．７ｄｔｅｘ、長さ６ｍｍ、引張強力２４．５ｃＮ／ｄｔｅｘ、破断伸度４．５％）を使用した。ポリマーセメントモルタル混練性、曲げ強度、および破壊エネルギー測定を行い、評価結果を表２に示す。 [Example 1]
At the mixing ratio shown in Table 1 by adjusting the polymer cement mortar, aramid fibers as short fibers (Teijin Techno Products Ltd. "Technora" (density 1.39 g / cm 3, fineness 1.7 dtex, length 6 mm, tensile The strength was 24.5 cN / dtex and the elongation at break was 4.5%.) Polymer cement mortar kneadability, bending strength, and fracture energy were measured, and the evaluation results are shown in Table 2.

［実施例２〜７、比較例１〜９］
実施例１において、ポリマーセメント組成物の配合割合、短繊維種、短繊維の容積混入率、単糸繊度、長さ、引張強力および破断伸度を表１に示す通り変更してポリマーセメントモルタルを調整し、ポリマーセメントモルタルの混練性、曲げ強度、および破壊エネルギー測定を行い、評価結果を表１に示す。 [Examples 2-7, Comparative Examples 1-9]
In Example 1, the blending ratio of the polymer cement composition, the short fiber type, the volume mixing ratio of the short fibers, the single yarn fineness, the length, the tensile strength and the elongation at break were changed as shown in Table 1 to change the polymer cement mortar. After adjusting, the kneadability, bending strength and fracture energy of the polymer cement mortar were measured, and the evaluation results are shown in Table 1.

Figure 0005378754
Figure 0005378754

本発明のポリマーセメント組成物は施工時の作業性を阻害することのない流動性を有し、該ポリマーセメント組成物中の繊維は均一に分散している。また得られた供試体は、作用応力が増加しても急激な繊維の破断は生じず、曲げ応力も低下することがなく、載荷終了間際まで、ひずみ硬化現象が現れることが認められた。また、三点曲げ試験において、曲げ応力が１２Ｎ／ｍｍ２、破壊エネルギー５ｋＮ／ｍｍ以上であることが明らかである。 The polymer cement composition of the present invention has fluidity that does not hinder workability during construction, and the fibers in the polymer cement composition are uniformly dispersed. In addition, it was confirmed that the obtained specimen did not cause a rapid fiber breakage even when the applied stress increased, the bending stress did not decrease, and a strain hardening phenomenon appeared just before the end of loading. In the three-point bending test, it is clear that the bending stress is 12 N / mm 2 and the fracture energy is 5 kN / mm or more.

Figure 0005378754
Figure 0005378754

本発明のポリマーセメント組成物は、現場での製造が容易であって、施工時の作業性を阻害することのない流動性を有し、高強度・高靱性が付与されているため、種々のコンクリート構造物劣化部の補修、または鉄筋コンクリート構造物からなる橋脚の耐震補強や道路床版の下面増厚等の補強にも好適に使用することができる。   The polymer cement composition of the present invention is easy to manufacture on site, has fluidity that does not hinder workability during construction, and has high strength and high toughness. It can also be suitably used for repairing a deteriorated part of a concrete structure, or for reinforcing a seismic reinforcement of a bridge pier made of a reinforced concrete structure or increasing the bottom surface of a road deck.

Claims (2)

セメント、水、骨材、ポリマー、および引張強度が２０ｃＮ／ｄｔｅｘ以上で、且つ密度が１ｇ／ｃｍ３以上、破断伸度が３〜８％範囲内であるポリパラフェニレン・テレフタラアミド短繊維を含有してなるポリマーセメント組成物であって、下記要件を満足することを特徴とするポリマーセメント組成物。
ａ）ポリマー配合量がセメント１００質量部に対し、１〜２０質量部であること。
ｂ）高強力短繊維の繊維長が１〜１８ｍｍ、単糸繊度が０．３〜１０ｄｔｅｘであること。
ｃ）高強力短繊維の混入率がポリマーセメント組成物全容積に対し０．１〜５．０容積％であること。 Cement, water, aggregate, polymer, and polyparaphenylene terephthalamide short fiber having a tensile strength of 20 cN / dtex or more, a density of 1 g / cm 3 or more, and a breaking elongation of 3 to 8%. A polymer cement composition comprising: a polymer cement composition satisfying the following requirements:
a) The polymer content is 1 to 20 parts by mass with respect to 100 parts by mass of cement.
b) The high-strength short fiber has a fiber length of 1 to 18 mm and a single yarn fineness of 0.3 to 10 dtex.
c) The mixing rate of high-strength short fibers is 0.1 to 5.0% by volume with respect to the total volume of the polymer cement composition. ポリパラフェニレン・テレフタラアミド短繊維がコポリパラフェニレン・３，４’−オキシジフェニレン・テレフタラアミド短繊維である請求項１記載のポリマーセメント組成物。The polymer cement composition according to claim 1, wherein the polyparaphenylene terephthalamide short fibers are copolyparaphenylene 3,4'-oxydiphenylene terephthalamide short fibers.
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