JP5780698B2 - Fiber reinforced mortar composition - Google Patents
Fiber reinforced mortar composition Download PDFInfo
- Publication number
- JP5780698B2 JP5780698B2 JP2009279339A JP2009279339A JP5780698B2 JP 5780698 B2 JP5780698 B2 JP 5780698B2 JP 2009279339 A JP2009279339 A JP 2009279339A JP 2009279339 A JP2009279339 A JP 2009279339A JP 5780698 B2 JP5780698 B2 JP 5780698B2
- Authority
- JP
- Japan
- Prior art keywords
- mass
- parts
- cement
- mortar
- reducing agent
- 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.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、土木及び建築分野におけるコンクリート構造物の補修・補強工事で使用する繊維補強モルタル組成物に関する。 The present invention relates to a fiber reinforced mortar composition used in repair and reinforcement work for concrete structures in the civil engineering and construction fields.
コンクリート構造物は、塩害、中性化、凍結融解、及び化学的腐食等の作用により劣化が進行し、表面にひび割れや浮き等が発生する恐れがある。その対策として、劣化した部分を打音検査等で確認し、電動ピック、エアピック、ウォータージェット等により取り除き、新たにポリマーセメントモルタル等の断面修復材で充填し、補修する工事が行われている。 Concrete structures may deteriorate due to salt damage, neutralization, freezing and thawing, chemical corrosion, and the like, and the surface may be cracked or floated. As countermeasures, there is a construction in which a deteriorated portion is confirmed by a hammering inspection or the like, removed with an electric pick, an air pick, a water jet or the like, and newly filled with a cross-sectional repair material such as polymer cement mortar and repaired.
ポリマーセメントモルタルの充填方法では、吹付け工法が多く採用されている（特許文献１、２参照）。一般的には、練り混ぜたモルタルをポンプで圧送し、圧縮空気と混合し、モルタルを吹き飛ばして施工する方法であり、システムが機械化されているので施工スピードが速く、補修断面への付着性に優れ、鉄筋裏側への密実な充填も可能という利点がある。 In the method of filling polymer cement mortar, many spraying methods are employed (see Patent Documents 1 and 2). In general, the mortar is kneaded with a pump, mixed with compressed air, and blown off the mortar.The system is mechanized, so the construction speed is fast and the adhesion to the repaired section is improved. It has the advantage that it is excellent and can be densely filled on the back side of the reinforcing bar.
近年では、下地躯体の変形への追従や、ひび割れの低減を目的として、短繊維をモルタル組成物に配合し、引張りや曲げ靭性等の機械的特性を向上した繊維補強モルタル組成物を用いる場合もある（特許文献３参照）。
しかしながら、このような繊維補強モルタルは、通常のポリマーセメントモルタルに比べると、靭性を向上させるためにセメント量の細骨材量に対する割合が高く設定されていることが多いため、ポリオキシアルキレン誘導体を主成分とした粉体の収縮低減剤を用いても十分な収縮低減効果が得られない場合があった。
また、セメントや微粉を多く含んでいることもあり、練り混ぜ時のミキサへの粉体投入時に多くの粉塵が発生する問題もあった。
In recent years, for the purpose of following deformation of the base frame and reducing cracks, a fiber reinforced mortar composition in which short fibers are blended with a mortar composition and mechanical properties such as tensile and bending toughness are improved may be used. Yes (see Patent Document 3).
However, since such fiber reinforced mortar is often set to have a high ratio of cement amount to fine aggregate amount in order to improve toughness as compared with ordinary polymer cement mortar, polyoxyalkylene derivatives are used. Even when a powder shrinkage reducing agent as a main component is used, a sufficient shrinkage reducing effect may not be obtained.
In addition, since it contains a large amount of cement and fine powder, there is a problem that a large amount of dust is generated when the powder is put into the mixer during mixing.
そこで、本発明者は、前記課題を解決すべく、種々の努力を重ねた結果、特定の材料を組み合わせることにより、収縮が小さく、下地躯体の変形への追従性や、ひび割れの低減効果にも優れ、粉塵の発生も少ない吹付け工法用の繊維補強モルタル組成物が得られることを知見し、本発明を完成するに至った。 Therefore, the present inventor has made various efforts to solve the above problems, and as a result, by combining specific materials, the shrinkage is small, and the followability to deformation of the base frame and the effect of reducing cracks are also reduced. The present inventors have found that a fiber-reinforced mortar composition for spraying can be obtained that is excellent and generates little dust, and has completed the present invention.
本発明は、収縮が小さく、下地躯体の変形への追従性や、ひび割れの低減効果にも優れ、粉塵の発生も少ない吹付け工法用の繊維補強モルタル組成物を提供する。 The present invention provides a fiber-reinforced mortar composition for a spraying method that is small in shrinkage, excellent in followability to deformation of a base casing, cracking reduction effect, and less dust generation.
すなわち、本発明は、（１）セメント、フライアッシュ、液体の収縮低減剤をまぶした最大粒径０．６ｍｍの石灰石である細骨材、流動化剤、膨張材、粉末ポリマー、増粘剤、及び短繊維を含有してなり、フライアッシュがセメント１００質量部に対して１０〜５０質量部であり、液体の収縮低減剤がセメント１００質量部に対して０．５〜４質量部であり、細骨材がセメント１００質量部に対して９０〜１３０質量部であり、短繊維がセメント１００質量部に対して２〜５質量部である、繊維補強モルタル組成物、である。 That is, the present invention includes: (1) cement, fly ash, fine aggregate made of limestone having a maximum particle size of 0.6 mm, coated with a liquid shrinkage reducing agent, a fluidizing agent, an expanding material, a powder polymer, a thickener, The fly ash is 10 to 50 parts by mass with respect to 100 parts by mass of the cement, and the liquid shrinkage reducing agent is 0.5 to 4 parts by mass with respect to 100 parts by mass of the cement. A fiber reinforced mortar composition in which the fine aggregate is 90 to 130 parts by mass with respect to 100 parts by mass of cement and the short fibers are 2 to 5 parts by mass with respect to 100 parts by mass of cement.
本発明によれば、収縮が小さく、下地躯体の変形への追従性や、ひび割れの低減効果にも優れ、粉塵の発生も少ないモルタルとなり、コンクリート構造物の補修・補強工事等へ適用できる。 According to the present invention, the mortar is small in shrinkage, has excellent followability to deformation of the base casing and is excellent in reducing cracks, and generates little dust, and can be applied to repair / reinforcement of concrete structures.
以下，本発明を詳細に説明する。 The present invention will be described in detail below.
本発明で使用するセメントとしては、特に限定されるものではないが、ＪＩＳ Ｒ ５２１０に規定されている各種ポルトランドセメント、ＪＩＳ Ｒ ５２１１、ＪＩＳ Ｒ ５２１２、及びＪＩＳ Ｒ ５２１３に規定された各種混合セメント、ＪＩＳに規定された以上の混和材混入率で製造した高炉セメント、フライアッシュセメント及びシリカセメント、石灰石粉末等を混合したフィラーセメントから選ばれる１種又は２種以上等が挙げられる。 The cement used in the present invention is not particularly limited, but various portland cements defined in JIS R 5210, various mixed cements defined in JIS R 5211, JIS R 5212, and JIS R 5213, One type or two or more types selected from filler cement mixed with blast furnace cement, fly ash cement, silica cement, limestone powder and the like manufactured at the admixture mixing rate specified in JIS or higher can be used.
本発明で使用するフライアッシュとは、フライアッシュ、石炭灰、あるいはボトムアッシュ等と称されるものを総称するものであり、特に限定されるものではない。 The fly ash used in the present invention is a generic term for what is called fly ash, coal ash, bottom ash or the like, and is not particularly limited.
フライアシュの粒度は、特に限定されるものではないが、通常、ブレーン比表面積値（以下、ブレーン値という）で、２０００〜９０００ｃｍ２／ｇが好ましく、３０００〜６０００ｃｍ２／ｇがより好ましい。２０００ｃｍ２／ｇ未満では強度発現性が十分でない場合があり、９０００ｃｍ２／ｇを超えると流動性が悪くなり、施工時のポンプ圧送性に支障をきたす場合がある。 The particle size of the fly ash is not particularly limited, usually, the Blaine specific surface area value (hereinafter, referred to as Blaine value) is preferably 2000~9000cm 2 / g, 3000~6000cm 2 / g is more preferable. If it is less than 2000 cm 2 / g, the strength development may not be sufficient, and if it exceeds 9000 cm 2 / g, the fluidity may be deteriorated and the pumpability during construction may be hindered.
フライアッシュの使用量は、通常、セメント１００質量部に対して１０〜５０質量部が好ましく２０〜３５質量部がより好ましい。１０質量部未満では良好な靭性が得られず、下地躯体の変形への追従性が不十分な場合があり、５０質量部を超えると流動性が悪くなり、施工時のポンプ圧送性に支障をきたす場合がある。 The amount of fly ash used is usually preferably 10 to 50 parts by mass and more preferably 20 to 35 parts by mass with respect to 100 parts by mass of cement. If it is less than 10 parts by mass, good toughness may not be obtained, and the followability to deformation of the base casing may be insufficient, and if it exceeds 50 parts by mass, the fluidity will deteriorate, and the pumpability during construction will be hindered. May come.
本発明で使用する液体の収縮低減剤とは、主成分で大別すると、低級アルコールアルキレンオキシド付加物系、アルコール系、グリコールエーテル・アミノアルコール誘導体系、ポリエーテル系、低分子量アルキレンオキシド共重合体系などが挙げられる。
液体の収縮低減剤は、各社より市販されており、例えば、電気化学工業社製「エスケーガード」、エフ・ピー・ケー社製「ヒビガード」、竹本油脂社製「ヒビダン」、太平洋セメント社製「テトラガード」、日本油脂社製「シュドックス」などが挙げられる。
収縮低減剤には液状のもの、粉末状のものが存在するが、本発明では液状のものでないと効果が得られない。あらかじめ液体の収縮低減剤を散布し、混合した細骨材を用いることにより、モルタル練り混ぜ時の発塵を抑制でき、硬化したモルタルの収縮量を小さくすることが可能となる。
ここで、細骨材と収縮低減剤を別々に使用した場合には本発明の効果は得られない。すなわち、同じ収縮低減剤の使用量で比較しても、本発明の方法でプレミックスモルタルに配合した場合には、発塵抑制効果が大きい。モルタルの練り混ぜ時に練り混ぜ水とともに収縮低減剤を添加するという従来の使用方法では、モルタルの発塵を抑制できない。
The liquid shrinkage reducing agent used in the present invention is roughly divided into main components, and can be roughly classified into lower alcohol alkylene oxide adducts, alcohols, glycol ether / amino alcohol derivatives, polyethers, and low molecular weight alkylene oxide copolymers. Etc.
Liquid shrinkage reducing agents are commercially available from various companies. For example, “SK Guard” manufactured by Electrochemical Industry Co., Ltd. “Tetragard”, “Shudox” manufactured by Nippon Oil & Fats Co., Ltd., and the like.
There are liquid and powdery shrinkage reducing agents, but in the present invention, the effect cannot be obtained unless it is liquid. By using a fine aggregate mixed with a liquid shrinkage reducing agent in advance, dust generation during kneading of the mortar can be suppressed, and the amount of shrinkage of the cured mortar can be reduced.
Here, the effect of the present invention cannot be obtained when the fine aggregate and the shrinkage reducing agent are used separately. That is, even when compared with the same amount of shrinkage reducing agent used, when it is blended with the premix mortar by the method of the present invention, the dust generation suppressing effect is large. In the conventional method of adding a shrinkage reducing agent together with kneaded water when kneading mortar, dust generation of mortar cannot be suppressed.
液体の収縮低減剤の使用量は、通常、セメント１００質量部に対して０．５〜４質量部が好ましく１〜３質量部がより好ましい。０．５質量部未満ではモルタル練り混ぜ時の発塵の抑制効果や硬化したモルタルの収縮低減効果が小さい場合があり、４質量部を超えると細骨材との混合性の低下や強度発現性の低下が起きる場合がある。 The amount of the liquid shrinkage reducing agent used is usually preferably 0.5 to 4 parts by mass and more preferably 1 to 3 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 0.5 parts by mass, the effect of suppressing dust generation when kneading mortar and the effect of reducing shrinkage of cured mortar may be small. If the amount exceeds 4 parts by mass, the mixability with fine aggregates and strength development will be reduced. May occur.
本発明で使用する細骨材としては、石灰石やケイ石等の天然の骨材、再生骨材や徐冷スラグ骨材等の人工骨材、軽量骨材、フェロニッケルスラグ、フェロクロムスラグ、銅スラグ、橄欖岩、エメリー鉱石等の重量骨材などが挙げられるが、中でも石灰石の骨材を選択することが、寸法安定性、靭性の向上、液体収縮低減剤との混合性の観点から好ましい。 Fine aggregates used in the present invention include natural aggregates such as limestone and quartzite, artificial aggregates such as recycled aggregates and slow-cooled slag aggregates, lightweight aggregates, ferronickel slag, ferrochrome slag, copper slag In particular, it is preferable to select a limestone aggregate from the viewpoint of dimensional stability, improvement of toughness, and miscibility with a liquid shrinkage reducing agent.
液体の収縮低減剤をまぶした細骨材の使用量は、通常、セメント１００質量部に対して９０〜１３０質量部が好ましく、１００〜１２０質量部がより好ましい。９０質量部未満では寸法安定性が悪くなる場合があり、１３０質量部を超えると良好な靭性が得られない場合や、強度発現性が不十分な場合がある。 In general, the amount of fine aggregate coated with a liquid shrinkage reducing agent is preferably 90 to 130 parts by mass, more preferably 100 to 120 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 90 parts by mass, the dimensional stability may be deteriorated. If the amount exceeds 130 parts by mass, good toughness may not be obtained, or strength development may be insufficient.
本発明で、液体の収縮低減剤をまぶした細骨材とは、細骨材に液体の収縮低減剤を散布し、均一に混合された細骨材のことを云う。均一に混合された状態とは、細骨材が凝集してダマになっていない状態のことであり、その評価は目視により行う。
混合装置としては、既存のいかなる装置も使用可能であり、例えば、傾胴ミキサ、オムニミキサ、ヘンシェルミキサ、Ｖ型ミキサ、及びナウタミキサ等の使用が可能である。
液体の収縮低減剤の混合方法は、まず、混合装置に細骨材を投入し、その後、液体の収縮低減剤を散布し、混合を開始する。目視により液体の収縮低減剤が均一に混合されたことを確認後、セメント、フライアッシュ、流動化剤、膨張材、粉末ポリマー、増粘剤、必要に応じて短繊維を投入し、混合する。なお、混合装置の種類により、液体の収縮低減剤が細骨材に均一に混合される時間が異なるため、注意が必要である。
In the present invention, a fine aggregate coated with a liquid shrinkage reducing agent refers to a fine aggregate that is uniformly mixed by spraying a liquid shrinkage reducing agent on the fine aggregate. The uniformly mixed state is a state in which the fine aggregates are not aggregated and become lumpy, and the evaluation is performed visually.
Any existing device can be used as the mixing device, and for example, a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, and a Nauta mixer can be used.
In the mixing method of the liquid shrinkage reducing agent, first, fine aggregate is put into the mixing device, and then the liquid shrinkage reducing agent is sprayed and mixing is started. After visually confirming that the liquid shrinkage reducing agent has been uniformly mixed, cement, fly ash, a fluidizing agent, an expanding material, a powder polymer, a thickener, and if necessary short fibers are added and mixed. It should be noted that the time during which the liquid shrinkage reducing agent is uniformly mixed with the fine aggregate differs depending on the type of the mixing device, so care must be taken.
本発明で使用する流動化剤とは、特に限定されるものではないが、例えば、ポリアルキルアリルスルホン酸塩の縮合物としては、第一工業製薬社製商品名「セルフロー１１０Ｐ」や出光石油化学社製商品名「ＩＰＣ」等が、また、ナフタレンスルホン酸塩の縮合物としては、花王社製商品名「マイティ１００」や三洋化成工業社製商品名「三洋レベロンＰ」等が、メラミン系のものとしては、シーカ社製「シーカメントＦＦ８６／１００」等が、さらに、ポリカルボン酸系としては、例えば、ＢＡＳＦポゾリス社製商品名「メルフラックスＡＰ１０１Ｆ+」や花王社製商品名「マイティ２１ＰＺ」等が挙げられる。 The fluidizing agent used in the present invention is not particularly limited. For example, as a condensate of polyalkylallyl sulfonate, trade name “Cell Flow 110P” manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. and Idemitsu Petrochemical The product name “IPC” and the like, and the condensate of naphthalene sulfonate include the product name “Mighty 100” manufactured by Kao Corporation and the product name “Sanyo Reberon P” manufactured by Sanyo Chemical Industries, Ltd. Examples of such products include “SEICAMENT FF86 / 100” manufactured by Sika Corporation, and examples of polycarboxylic acid-based products include, for example, trade name “Melflux AP101F +” manufactured by BASF Pozzolith Co., Ltd., and “Mighty 21PZ” manufactured by Kao Corporation. Is mentioned.
流動化剤の使用量は、通常、セメント１００質量部に対して０．０２〜０．５質量部が好ましく、０．０５〜０．２５質量部がより好ましい。０．０２質量部未満では良好な流動性が得られず、施工時のポンプ圧送性に支障をきたす場合があり、０．５質量部を超えると流動性が高くなり過ぎ、吹付けた際にモルタルがだれて施工に支障をきたす場合がある。 Usually, 0.02-0.5 mass part is preferable with respect to 100 mass parts of cement, and 0.05-0.25 mass part is more preferable. If it is less than 0.02 parts by mass, good fluidity cannot be obtained and the pumpability during construction may be hindered. If it exceeds 0.5 parts by mass, the fluidity will be too high and sprayed. The mortar may get in the way and hinder the construction.
本発明で使用する膨張材とは、モルタルの乾燥による硬化収縮を低減するために使用されるもので、特に限定されるものではないが、アウイン系、カルシウムアルミノフェライト系、石灰系等のものが挙げられる。 The expansion material used in the present invention is used to reduce the curing shrinkage due to drying of the mortar, and is not particularly limited, but those such as Auin, calcium aluminoferrite, and lime are used. Can be mentioned.
膨張材の使用量は、通常、セメント１００質量部に対して２〜８質量部が好ましく４〜６質量部がより好ましい。２質量部未満では収縮を抑制する効果が十分でなく、１０質量部を超えて配合してもその効果の向上が少ない。 In general, the amount of the expansion material used is preferably 2 to 8 parts by mass and more preferably 4 to 6 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 2 parts by mass, the effect of suppressing shrinkage is not sufficient, and even if the amount exceeds 10 parts by mass, the improvement in the effect is small.
本発明で使用する粉末ポリマーとしては、再乳化型粉末樹脂を用いる。再乳化型粉末樹脂には、例えば、スチレンブタジエンゴム、エチレン酢酸ビニル、酢酸ビニルビニルバーサテート、スチレンアクリル酸エステル、ポリアクリル酸エステル等がある。 As the powder polymer used in the present invention, a re-emulsifying powder resin is used. Examples of the re-emulsifying powder resin include styrene butadiene rubber, ethylene vinyl acetate, vinyl acetate vinyl versatate, styrene acrylate, polyacrylate and the like.
粉末ポリマーの使用量は、通常、セメント１００質量部に対して５〜１３質量部が好ましく、７〜１１質量部がより好ましい。５質量部未満では曲げ強度や付着強度の改善や耐久性を付与する効果が小さく、１３質量部を超えると凝結の遅れや強度発現性の低下が起きる場合がある。 As for the usage-amount of a powder polymer, 5-13 mass parts is preferable normally with respect to 100 mass parts of cement, and 7-11 mass parts is more preferable. If the amount is less than 5 parts by mass, the effects of improving bending strength and adhesion strength and imparting durability are small, and if it exceeds 13 parts by mass, the setting may be delayed or the strength may be lowered.
本発明で使用する増粘剤とは、モルタルに適度な粘性を付与し、吹付けた際やコテ仕上げ時のモルタルのだれを抑制するために使用されるもので、通常市販されているものが使用できる。例えば、メチルセルロース、ヒドロキシプロピルセルロース、メチルエチルセルロース等のセルロースエーテル系増粘剤、グアーガム、デュータンガム、ウエランガム等のバイオサッカライド系増粘剤、ポリアクリル酸塩、ポリビニルアルコール等の合成高分子類等が挙げられる。 The thickener used in the present invention is used to impart an appropriate viscosity to the mortar, and to suppress dripping of the mortar during spraying or iron finishing, and is usually commercially available. Can be used. Examples include cellulose ether thickeners such as methylcellulose, hydroxypropylcellulose, and methylethylcellulose; biosaccharide thickeners such as guar gum, detan gum, and welan gum; and synthetic polymers such as polyacrylate and polyvinyl alcohol. .
増粘剤の使用量は、通常、セメント１００質量部に対して０．０２〜０．３質量部が好ましく、０．０４〜０．１質量部がより好ましい。０．０２質量部未満では、粘性が付与できずだれを抑制する効果が小さい場合があり、０．３質量部を超えると粘性が強くなりすぎ施工時のポンプ圧送性が悪くなる場合がある。 The amount of the thickener used is usually preferably 0.02 to 0.3 parts by mass, more preferably 0.04 to 0.1 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 0.02 parts by mass, the viscosity cannot be imparted and the effect of suppressing dripping may be small. If the amount exceeds 0.3 parts by mass, the viscosity becomes too strong and the pumpability at the time of construction may deteriorate.
本発明で使用する短繊維とは、吹付けたモルタルの引張りや曲げ靭性を向上するために使用される。短繊維の種類としては、ビニロン繊維やプロピレン繊維に代表される高分子繊維類、鋼繊維、ガラス繊維、及び炭素繊維に代表される無機繊維類がある。 The short fiber used in the present invention is used for improving the tension and bending toughness of the sprayed mortar. The types of short fibers include polymer fibers typified by vinylon fibers and propylene fibers, steel fibers, glass fibers, and inorganic fibers typified by carbon fibers.
短繊維の使用量は、通常、セメント１００質量部に対して２〜５質量部が好ましく、２．５〜３．５質量部がより好ましい。２質量部未満では、良好な靭性が得られない場合があり、５質量部を超えると流動性が悪くなり、施工時のポンプ圧送性が悪くなる場合がある。
短繊維の混合方法は、特に限定されないが、施工時のモルタル練り混ぜの際に、ドライモルタル、水とともにミキサに投入後、混合するか、あるいは、プレミックスモルタル製造時に、予めドライモルタルと混合しておくことが短繊維の分散性の面から好ましい。
Usually, the amount of short fibers used is preferably 2 to 5 parts by mass, more preferably 2.5 to 3.5 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 2 parts by mass, good toughness may not be obtained. If the amount exceeds 5 parts by mass, the fluidity may deteriorate and the pumpability during construction may deteriorate.
The method of mixing the short fibers is not particularly limited, but when mixing mortar at the time of construction, mix with dry mortar and water after mixing into the mixer, or mix with dry mortar in advance during premix mortar production. It is preferable from the viewpoint of dispersibility of the short fibers.
本発明では、繊維補強モルタル組成物に、必要に応じ、消泡剤、撥水剤、抗菌剤等の各種セメント混和剤を併用することが可能である。 In the present invention, various cement admixtures such as an antifoaming agent, a water repellent and an antibacterial agent can be used in combination with the fiber reinforced mortar composition as necessary.
本発明の繊維補強モルタル組成物と混合する水量は、モルタルのポンプ圧送性、吹付け性、及び硬化物性を考慮し、通常、繊維補強モルタル組成物１００質量部に対して１３〜２２質量部が好ましく、１６〜１９質量部がより好ましい。１３質量部未満ではモルタルのポンプ圧送できる流動性を確保することが難しく、２２質量部を越えると強度発現性が低下する場合がある。１０〜２２質量部の範囲であれば、流動化剤量を調整することでポンプ圧送に適する適度な流動性に調整することができる。 The amount of water mixed with the fiber-reinforced mortar composition of the present invention is usually 13 to 22 parts by mass with respect to 100 parts by mass of the fiber-reinforced mortar composition in consideration of the pumpability, sprayability, and cured properties of the mortar. Preferably, 16 to 19 parts by mass are more preferable. If the amount is less than 13 parts by mass, it is difficult to ensure fluidity capable of pumping mortar, and if it exceeds 22 parts by mass, strength development may be reduced. If it is the range of 10-22 mass parts, it can adjust to moderate fluidity | liquidity suitable for pump pumping by adjusting the amount of fluidizing agents.
本発明の繊維補強モルタル組成物は、通常、吹付け工法にて施工する。ただし、繊維補強モルタル組成物と水とを混合し、練り混ぜたモルタルをポンプで圧送し、圧送途中で圧縮空気を合流して吹き付ける方法であれば、吹付けシステムや方法は特に限定されるものではない。 The fiber-reinforced mortar composition of the present invention is usually applied by a spraying method. However, the spraying system and method are particularly limited as long as the fiber-reinforced mortar composition and water are mixed, the mixed mortar is pumped with a pump, and compressed air is joined and sprayed during the pumping. is not.
繊維補強モルタル組成物練り混ぜ時に、消泡剤を適量混合して巻込み空気量を低減し、吹付けた場合と同程度のモルタル密度とすれば、吹付けた場合と同様の強度値が得られる。したがって、そのままコテ塗り工法として用いることも可能である。 When mixing the fiber reinforced mortar composition, an appropriate amount of antifoaming agent is mixed to reduce the amount of entrained air, and if the mortar density is about the same as when sprayed, the same strength value as when sprayed is obtained. It is done. Therefore, it can be used as a trowel coating method as it is.
以下、実施例にて詳細に説明する。 Hereinafter, the embodiment will be described in detail.
「実験例１」
セメント１００質量部に対してフライアッシュ２５質量部、細骨材１１０質量部、流動化剤０．１質量部、膨張材５質量部、粉末ポリマー９質量部、増粘材０．０５質量部、短繊維３質量部、表１に示す収縮低減剤を加えてドライモルタルを調整した。液体の収縮低減剤を細骨材に散布した後、ナウタミキサで1分間混合し、均一に混合されたことを確認した細骨材を用いてドライモルタルを調製した。このドライモルタル１００質量部に対して水を１８質量部となるように加えてパン型ミキサで練り混ぜ、発塵の程度を目視により観察した。その後、練り混ぜたモルタルをスクイズポンプで圧送し、吐出ノズル手前で圧縮空気を合流させてコンクリートパネルに吹付けた。吹付けたモルタルで供試体を作製し、硬化後の圧縮強度、長さ変化率を測定した。なお、比較例として、液体の収縮低減剤を細骨材にまぶさないで、水と共にパン型ミキサで練り混ぜたモルタルを吹付けて同様に物性を測定した（実験No.1-10）。結果を表１に併記する。
"Experiment 1"
25 parts by mass of fly ash, 110 parts by mass of fine aggregate, 0.1 part by mass of a fluidizing agent, 5 parts by mass of an expansion material, 9 parts by mass of a powder polymer, 0.05 part by mass of a thickener, Dry mortar was prepared by adding 3 parts by mass of short fibers and the shrinkage reducing agent shown in Table 1. After spraying the liquid shrinkage reducing agent on the fine aggregate, it was mixed with a Nauta mixer for 1 minute, and dry mortar was prepared using the fine aggregate that was confirmed to be uniformly mixed. Water was added to 100 parts by mass of this dry mortar so as to be 18 parts by mass and kneaded with a pan mixer, and the degree of dust generation was visually observed. Thereafter, the kneaded mortar was pumped with a squeeze pump, and compressed air was merged before the discharge nozzle and sprayed onto the concrete panel. A specimen was prepared with the sprayed mortar, and the compression strength after curing and the rate of change in length were measured. As a comparative example, physical properties were measured in the same manner by spraying mortar kneaded with a pan-type mixer with water without applying a liquid shrinkage reducing agent to the fine aggregate (Experiment No. 1-10). The results are also shown in Table 1.
（使用材料）
セメント：普通ポルトランドセメント、市販品
フライアッシュ：碧南火力製ＪＩＳII種品
細骨材Ａ：新潟県青海町産石灰砂乾燥品、最大粒径０．６ｍｍ
流動化剤：ポリカルボン酸系流動化剤、市販品
膨張材：カルシウムサルホアルミネート系膨張材、市販品
粉末ポリマー：アクリル酸エステル系再乳化型粉末ポリマー、市販品
増粘剤：メチルセルロース系増粘剤、市販品
短繊維：ビニロン繊維、繊維長さ１２ｍｍ、収束タイプ、市販品
収縮低減剤ａ：ポリエーテル系収縮低減剤、液体、試販品
収縮低減剤ｂ：低級アルコールアルキレンオキシド付加物系収縮低減剤、粉体、試販品
(Materials used)
Cement: Ordinary Portland cement, commercial fly ash: JIS II type fine aggregate made by Shonan Thermal Power A: Dry lime sand product from Aomi, Niigata Prefecture, maximum particle size 0.6mm
Fluidizing agent: polycarboxylic acid type fluidizing agent, commercial product expansion material: calcium sulfoaluminate type expansion material, commercial product powder polymer: acrylate ester type re-emulsifying powder polymer, commercial product thickener: methylcellulose type thickening Agent, commercial short fiber: vinylon fiber, fiber length 12 mm, convergence type, commercial shrinkage reducing agent a: polyether shrinkage reducing agent, liquid, trial sale shrinkage reducing agent b: lower alcohol alkylene oxide adduct shrinkage Reducing agent, powder, trial product
（試験方法）
発塵の程度：モルタル練り混ぜ時の発塵の程度を目視確認し、評価した。
圧縮強度：ＪＩＳ Ｒ ５２０１に準拠した。材齢２８日。
長さ変化率：ＪＩＳ Ａ １１７１に準拠した。材齢２８日。
Degree of dust generation: The degree of dust generation during mortar mixing was visually confirmed and evaluated.
Compressive strength: compliant with JIS R 5201. Age 28 days.
Length change rate: Conforms to JIS A 1171. Age 28 days.
「実験例２」
収縮低減剤ａ２質量部を表２に示す量の細骨材にまぶして混合し、混合性を目視確認後、セメント１００質量部に対してフライアッシュ２５質量部、流動化剤０．１質量部、膨張材５質量部、粉末ポリマー９質量部、増粘材０．０５質量部、短繊維３質量部を加えてドライモルタルを調整し、曲げじん性係数を測定した以外は実験例１と同様に行った。結果を表２に併記する。
"Experimental example 2"
Shrinkage reducing agent a2 parts by mass is applied to a fine aggregate of the amount shown in Table 2 and mixed. After visually confirming the mixing property, 25 parts by mass of fly ash and 0.1 part by mass of fluidizing agent are added to 100 parts by mass of cement. The same as Experimental Example 1, except that 5 parts by mass of an expanding material, 9 parts by mass of a powdered polymer, 0.05 part by mass of a thickener, and 3 parts by mass of short fibers were added to adjust the dry mortar and measure the flexural toughness coefficient. Went to. The results are also shown in Table 2.
（試験方法）
液体収縮低減剤の混合性：液体収縮低減剤が細骨材中に均一に分散されているかを目視確認し評価した。○はダマが完全にない状態、△はダマが全体の１〜３割程度見受けられる状態、×はダマが３割程度以上見受けられる状態
曲げじん性係数：ＪＳＣＥ−Ｇ ５５２−２００７に準拠した。材齢２８日。
(Test method)
Mixability of liquid shrinkage reducing agent: It was visually confirmed and evaluated whether the liquid shrinkage reducing agent was uniformly dispersed in the fine aggregate. ○ is a state in which no lumps are completely observed, Δ is a state in which lumps are found to be about 30 to 30%, and × is a state in which dams are found to be about 30% or more. Age 28 days.
「実験例３」
セメント１００質量部に対してフライアッシュ２５質量部、収縮低減剤ａ２質量部をまぶした細骨材１１２質量部、流動化剤０．１質量部、膨張材５質量部、粉末ポリマー９質量部、増粘材０．０５質量部、表３に示す短繊維を加えてドライモルタルを調製し、流動性を測定した以外は実験例２と同様に行った。結果を表３に併記する。
"Experiment 3"
25 parts by mass of fly ash with respect to 100 parts by mass of cement, 112 parts by mass of fine aggregate coated with 2 parts by mass of shrinkage reducing agent, 0.1 parts by mass of fluidizing agent, 5 parts by mass of expansion material, 9 parts by mass of powder polymer, It was performed in the same manner as in Experimental Example 2 except that 0.05 part by mass of a thickener and short fibers shown in Table 3 were added to prepare a dry mortar, and the fluidity was measured. The results are also shown in Table 3.
（試験方法）
流動性：ＪＩＳ Ｒ ５２０１のフロー試験に準拠した。
(Test method)
Fluidity: compliant with JIS R 5201 flow test.
本発明の繊維補強モルタル組成物は、収縮が小さく、下地躯体の変形への追従性や、ひび割れの低減効果にも優れ、粉塵の発生も少ないモルタルとなり、コンクリート構造物の補修・補強工事等に適するので、土木、建築分野で広範に適用できる。 The fiber reinforced mortar composition of the present invention has a small shrinkage, is excellent in followability to deformation of the base frame and is effective in reducing cracks, becomes a mortar with less dust generation, and is used for repair and reinforcement work of concrete structures. Since it is suitable, it can be widely applied in the civil engineering and construction fields.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009279339A JP5780698B2 (en) | 2009-12-09 | 2009-12-09 | Fiber reinforced mortar composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009279339A JP5780698B2 (en) | 2009-12-09 | 2009-12-09 | Fiber reinforced mortar composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2011121795A JP2011121795A (en) | 2011-06-23 |
| JP5780698B2 true JP5780698B2 (en) | 2015-09-16 |
Family
ID=44286077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009279339A Active JP5780698B2 (en) | 2009-12-09 | 2009-12-09 | Fiber reinforced mortar composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5780698B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6356057B2 (en) * | 2014-12-15 | 2018-07-11 | 株式会社トクヤマ | Hydraulic composition containing bottom ash |
| KR101599717B1 (en) * | 2015-01-19 | 2016-03-07 | 서남대학교 산학협력단 | Antimicrobial compositions and a method of manufacturing the green ocher mortar |
| JP6647857B2 (en) * | 2015-12-22 | 2020-02-14 | 株式会社熊谷組 | Pipe joining method |
| JP6647856B2 (en) * | 2015-12-22 | 2020-02-14 | 株式会社熊谷組 | Grout joint structure |
| JP7045269B2 (en) * | 2018-06-19 | 2022-03-31 | 太平洋マテリアル株式会社 | Polymer cement mortar composition and polymer cement mortar |
| JP7321057B2 (en) * | 2019-10-29 | 2023-08-04 | 太平洋マテリアル株式会社 | Polymer cement composition and polymer cement mortar |
| JP7403342B2 (en) | 2020-02-18 | 2023-12-22 | 太平洋マテリアル株式会社 | Cement composition and its manufacturing method, and mortar |
| CN113248192A (en) * | 2021-06-30 | 2021-08-13 | 万特福建筑构件有限公司 | Recycled fine aggregate wet-mixed mortar and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003306367A (en) * | 2002-04-11 | 2003-10-28 | Toagosei Co Ltd | Composition for repairing reinforced concrete and repairing method using it |
| JP5085237B2 (en) * | 2007-08-30 | 2012-11-28 | 電気化学工業株式会社 | Premixed mortar and method for producing the same |
-
2009
- 2009-12-09 JP JP2009279339A patent/JP5780698B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011121795A (en) | 2011-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5780698B2 (en) | Fiber reinforced mortar composition | |
| KR101073967B1 (en) | Pre-mix composition for shotcrete of wet method and repair method using the same | |
| JP5415015B2 (en) | Spray repair method | |
| JP2020158371A (en) | Polymer cement mortar and repair method of reinforced concrete | |
| JP6033636B2 (en) | Repair mortar for spraying with low electrical resistance and repair method using the same | |
| JP2009114002A (en) | Abrasion-resistant material and repair method using the same | |
| JP2001322858A (en) | Concrete section repair material | |
| JP4209191B2 (en) | Spraying material and spraying method using the same | |
| JP5046472B2 (en) | Cement admixture and cement composition | |
| JP2008002176A (en) | Composite body and method of producing the same | |
| JP2004224631A (en) | Polymer hydraulic composition | |
| JP4672572B2 (en) | Cement composition for spraying and spraying method using the same | |
| JP5514790B2 (en) | Acid-resistant dry-type mortar material and method for producing the spray material | |
| JP2011207643A (en) | Mortar material for dry spraying and method for manufacturing the spray material | |
| JP2009023878A (en) | Concrete for repairing cross section, and construction method for repairing cross section of concrete structure using the same | |
| JP2005047755A (en) | Cement composition for spray, and spraying method therewith | |
| JP2730234B2 (en) | High flow and high durability fiber reinforced filling mortar with excellent salt barrier properties | |
| JP4681359B2 (en) | High-strength mortar, high-strength concrete, method for producing high-strength mortar hardened body, method for improving durability of structure, and premix material for high-strength mortar | |
| JP5073688B2 (en) | Spray material and spraying method | |
| JP4265761B2 (en) | Spraying material and spraying method using the same | |
| JP4553503B2 (en) | Cement mortar for wet spraying | |
| JP7321057B2 (en) | Polymer cement composition and polymer cement mortar | |
| JP2000086319A (en) | Quick-setting spraying cement concrete and spraying method using the same | |
| JP5483695B2 (en) | Crack-inhibiting spray material and spraying method using the same | |
| JP4916786B2 (en) | Spray cement composition and spray method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20120703 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20130612 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20130618 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20130801 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20140513 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20140724 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20140806 |
|
| A912 | Re-examination (zenchi) completed and case transferred to appeal board |
Free format text: JAPANESE INTERMEDIATE CODE: A912 Effective date: 20141010 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20150714 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 5780698 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |