JP2007261853A - Repairing material for cross sectional deficit of concrete structure - Google Patents
Repairing material for cross sectional deficit of concrete structure Download PDFInfo
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本発明は、建築物などのコンクリート構造物の断面欠損の修復に使用する修復材に関する。 The present invention relates to a restoration material used for repairing a cross-sectional defect of a concrete structure such as a building.
コンクリート構造物は、ジャンカなどの初期欠陥、塩害、中性化などの劣化、衝突などの損傷によって、部分的にコンクリートの断面欠損が起こることがあり、このような断面欠損は、構造上の問題、あるいは耐久性、美観等の観点から好ましくないことが多い。
このような部分的で小規模な断面の欠損の修復方法としては、従来、セメントモルタルやポリマーセメントモルタルなどが一般的に使用されている。これらの材料は、セメント、骨材及び各種混和材・混和剤などを現場で調合したり、予め水以外の粉体を既調合したプレミックスモルタルが使用されたりしている。
Concrete structures may have partial defects in concrete due to initial defects such as jumpers, salt damage, deterioration such as neutralization, and damage such as collisions. Or, it is often not preferable from the viewpoint of durability, aesthetics, and the like.
Conventionally, cement mortar, polymer cement mortar, and the like are generally used as a method for repairing such partial and small-scale defects. As these materials, cement, aggregate, various admixtures / admixtures, etc. are prepared on site, or premixed mortar in which powders other than water are preliminarily prepared is used.
しかし、これらの材料と水を施工現場で混合する必要があり、混合器具を準備し、水を計量し、混合器具を洗浄したりする手間が掛かかり、混練時に粉塵が発生するという問題点を有していた。 However, it is necessary to mix these materials and water at the construction site, and it takes time and effort to prepare the mixing equipment, weigh the water, and wash the mixing equipment. Had.
ところで、コンクリートの亀裂部の補修方法において、施工現場での混合に関する手間、粉塵発生等を改善するために、特許文献１にポルトランドセメント及び／又は混合セメントとカルシウムアルミネートを含む粒子間隙が４５〜６５容積％の混合粒子と、溶解度パラメーターが９．０以上の有機溶媒とを含有し、２０℃での粘度が２０Ｐａ・ｓ以下である流体状硬化材を使用することが開示されている。 By the way, in the repair method of the crack part of concrete, in order to improve the effort regarding mixing in a construction site, dust generation, etc., the particle gap containing Portland cement and / or mixed cement and calcium aluminate is 45 to 45. It is disclosed that a fluid curing material containing 65% by volume of mixed particles and an organic solvent having a solubility parameter of 9.0 or more and having a viscosity at 20 ° C. of 20 Pa · s or less is disclosed.
しかしながら、この流体状硬化材を上記したコンクリート構造物の断面欠損の修復の用途に使用した場合には、粘度が低いのでダレてしまい、断面欠損への充填性がなく、全く使用することができない。 However, when this fluid hardening material is used for repairing a cross-sectional defect of a concrete structure as described above, the viscosity is low, so that it sags and there is no filling property to the cross-sectional defect and cannot be used at all. .
本発明は、コンクリート構造物の断面欠損の修復に用いる修復材であって、現場での計量、混合操作の必要がなく、修復作業において、ダレることなくコンクリート構造物の断面欠損部へ良好な充填ができ、水を噴霧することで硬化して強度発現する修復材を提供することを目的とする。 The present invention is a restoration material used for repairing a cross-sectional defect of a concrete structure, which does not require on-site measurement and mixing operation, and is excellent in a cross-sectional defect part of a concrete structure without sagging in a repair operation. An object of the present invention is to provide a restoration material that can be filled and cured by spraying water to develop strength.
本発明者らは鋭意検討を行った結果、セメントと、細骨材と、特定の沸点範囲の水溶性有機溶剤と、粘稠化材とをプレミックスした、２０℃での粘度が特定範囲のゲル状修復材が上記目的を達成できることを見出し、本発明を完成した。
すなわち、本発明は、
（１）セメントと、細骨材と、沸点が３０〜１００℃の水溶性有機溶剤と、粘稠化材とを含有し、２０℃での粘度が２０Ｐａ・ｓを超え２００Ｐａ・ｓ以下であることを特徴とするコンクリート構造物断面欠損の修復材；
（２）セメント１００質量部、細骨材を２０〜５００質量部、沸点が３０〜１００℃の水溶性有機溶剤をセメント及び細骨材の合計量に対し１５〜５０質量％、および粘稠化材を含有する上記（１）のコンクリート構造物断面欠損の修復材；
（３）清浄化した修復対象部に、上記（１）又は（２）の修復材を充填し、水を噴霧することを特徴とするコンクリート構造物断面欠損の修復工法；
を提供するものである。
As a result of intensive studies, the present inventors have premixed cement, fine aggregate, a water-soluble organic solvent having a specific boiling range, and a thickener, and the viscosity at 20 ° C. is within a specific range. The present inventors have found that a gel-like restoration material can achieve the above-mentioned object.
That is, the present invention
(1) Contains cement, fine aggregate, a water-soluble organic solvent having a boiling point of 30 to 100 ° C., and a thickener, and has a viscosity at 20 ° C. of more than 20 Pa · s and not more than 200 Pa · s. A material for repairing a defect in a cross section of a concrete structure characterized by:
(2) 100 parts by mass of cement, 20 to 500 parts by mass of fine aggregate, 15 to 50% by mass of water-soluble organic solvent having a boiling point of 30 to 100 ° C. with respect to the total amount of cement and fine aggregate, and thickening A material for repairing a defect in a cross section of a concrete structure according to the above (1) containing a material;
(3) A repair method for cross-sectional defects of a concrete structure, characterized in that the repaired material of the above (1) or (2) is filled in the cleaned repair target part and sprayed with water;
Is to provide.
本発明のコンクリート構造物断面欠損の修復材は、セメント、細骨材、水溶性有機溶剤、粘稠化材をプレミックスしたゲル状修復材であって、現場での計量、混合操作が必要なく、粉塵を発生することもない。そして、本発明のゲル状修復材は、修復作業時、ダレることなく、コンクリート構造物の断面欠損部へ良好に充填ができ、水を噴霧することにより、噴霧水が水溶性有機溶剤と置き換わり、かつ水溶性有機溶剤が蒸発することにより、水とセメントの反応が起こり／促進され、硬化して強度が発現する。また、本発明の修復材は、水を含まないため、保管時、長期にわたって、硬化せず、分離することもなく、良好な作業性が確保される。 The restoration material for a cross-section defect of a concrete structure according to the present invention is a gel-like restoration material premixed with cement, fine aggregate, water-soluble organic solvent, and thickening material, and does not require on-site metering and mixing operations. Does not generate dust. And the gel-like restoration material of the present invention can be satisfactorily filled into the cross-sectional defect portion of the concrete structure without sagging during the restoration work, and spraying water replaces the spray water with the water-soluble organic solvent. In addition, when the water-soluble organic solvent evaporates, the reaction between water and cement occurs / accelerates and hardens to develop strength. Moreover, since the restoration | restoration material of this invention does not contain water, it is not hardened | cured and isolate | separated over a long period at the time of storage, and favorable workability | operativity is ensured.
本発明のコンクリート構造物断面欠損の修復材は、セメントと、細骨材と、特定の沸点範囲の水溶性有機溶剤と、粘稠化材とをプレミックスした特定粘度範囲のゲル状修復材である。 The concrete structure cross-sectional defect restoration material of the present invention is a gel-like restoration material having a specific viscosity range obtained by premixing cement, fine aggregate, a water-soluble organic solvent having a specific boiling range, and a thickening material. is there.
本発明で使用されるセメントは、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、耐硫酸塩ポルトランドセメントなどのポルトランドセメント；及び高炉セメント、シリカセメント、フライアッシュセメントなどの混合セメントが挙げられ、また、超速硬セメントとして、例えば、１１（ＣａＯ）7（Ａｌ2Ｏ3）ＣａＦ2を主成分とする、いわゆるジェットセメント；ポルトランドセメントとアルミナセメントとせっこうの３成分から構成される超速硬セメント；アルミナセメント単体などが使用できる。
本発明においては、水溶性有機溶剤の存在によりセメントの水和が遅れるため、超速硬セメントの使用が好ましく、ＪＩＳ Ｒ５２０１に準じて測定された硬化時間（終結時間）が１分〜６０分程度の超速硬セメントであることが好ましい。また、硬化時間を調整するために、セメントの水和を早くする炭酸ナトリウム、炭酸カリウム、炭酸リチウム、炭酸水素ナトリウム、硫酸リチウム、トリエタノールアミン及びギ酸カルシウムなどの硬化促進剤を併用することが好ましい。
Cement used in the present invention includes ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement and other Portland cements; and blast furnace cement, silica cement, fly ash cement and the like In addition, as a super fast cement, for example, so-called jet cement mainly composed of 11 (CaO) 7 (Al 2 O 3 ) CaF 2 ; three components of Portland cement, alumina cement and gypsum An ultra-fast hard cement composed of: alumina cement alone can be used.
In the present invention, since the hydration of the cement is delayed due to the presence of the water-soluble organic solvent, it is preferable to use a super-hard cement, and the setting time (end time) measured according to JIS R5201 is about 1 to 60 minutes. It is preferable that it is a super fast hardening cement. Further, in order to adjust the setting time, it is preferable to use a combination of hardening accelerators such as sodium carbonate, potassium carbonate, lithium carbonate, sodium hydrogen carbonate, lithium sulfate, triethanolamine and calcium formate to accelerate cement hydration. .
本発明で使用される細骨材としては、川砂、海砂、山砂、砕砂、３〜８号珪砂、石灰石、及びスラグ骨材等を使用することができ、特に、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を用いることが好ましい。
その配合割合は、上記セメント１００質量部に対して２０〜５００質量部、好ましくは４０〜３００質量部、特に好ましくは、６０〜１５０質量部とすることが望ましい。
かかる配合比で細骨材を混合することより、更に、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。
また、細骨材の最大粒径は６ｍｍ以下で、該細骨材の平均粒径が０．８ｍｍ〜２．５ｍｍのものが好ましく、１．０〜２．０ｍｍのものがより好ましい。
As the fine aggregate used in the present invention, river sand, sea sand, mountain sand, crushed sand, No. 3-8 silica sand, limestone, slag aggregate, and the like can be used, especially fine powder and coarse bone. It is preferable to use fine aggregates such as silica sand and limestone whose particle size is adjusted without containing any material.
The blending ratio is 20 to 500 parts by mass, preferably 40 to 300 parts by mass, and particularly preferably 60 to 150 parts by mass with respect to 100 parts by mass of the cement.
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 a curing shrinkage with no practical problem is obtained.
The fine aggregate has a maximum particle diameter of 6 mm or less, and the fine aggregate preferably has an average particle diameter of 0.8 mm to 2.5 mm, more preferably 1.0 to 2.0 mm.
本発明で使用される有機溶剤は、水溶性であり、沸点が３０〜１００℃のものである。修復作業時、噴霧水がセメントと反応するために、噴霧水と有機溶剤が混ざって置き換わってゆくよう有機溶剤は水溶性であることを要し、また、セメントと水との水和反応が進行し、硬化が進むためには、有機溶剤が速やかに蒸発するよう沸点が３０〜１００℃であることを要し、より好ましくは、沸点が３０〜８０℃である。
かかる水溶性有機溶剤としては、メタノール、エタノールなど低級アルコール類、アセトン、メチルエチルケトンなどケトン類、酢酸エチルなどエステル類等が挙げられ、人体への影響などの点からエタノールが最も好ましく用いられる。
その配合割合は、セメント及び細骨材の合計量に対し１５〜５０質量％、好ましくは１５〜４０質量％、特に好ましくは、１５〜３０質量％とすることが望ましい。
水溶性有機溶剤量は、少なすぎるとゲル性状にできても粘性が高すぎて充填性、作業性が悪くなり、多すぎると粘性が低下しすぎて充填してもダレが生じ充填しても隙間が生じ、噴霧水との置き換わりに時間を要し、セメントの水和反応（硬化反応）が遅くなる。
The organic solvent used in the present invention is water-soluble and has a boiling point of 30 to 100 ° C. During the restoration work, since the spray water reacts with the cement, the organic solvent must be water-soluble so that the spray water and the organic solvent are mixed and replaced, and the hydration reaction between the cement and water proceeds. For the curing to proceed, the boiling point is required to be 30 to 100 ° C., and more preferably the boiling point is 30 to 80 ° C. so that the organic solvent evaporates quickly.
Examples of the water-soluble organic solvent include lower alcohols such as methanol and ethanol, ketones such as acetone and methyl ethyl ketone, and esters such as ethyl acetate. Ethanol is most preferably used from the viewpoint of influence on the human body.
The blending ratio is 15 to 50% by mass, preferably 15 to 40% by mass, and particularly preferably 15 to 30% by mass with respect to the total amount of cement and fine aggregate.
If the amount of the water-soluble organic solvent is too small, even if it can be gelled, the viscosity is too high and the filling property and workability are deteriorated. A gap is formed, and it takes time to replace the sprayed water, and the hydration reaction (hardening reaction) of the cement becomes slow.
本発明のゲル状修復材は、セメント、細骨材、沸点が３０〜１００℃の水溶性有機溶剤のみでは、セメントや細骨材が沈降して有機溶剤が分離して均一なゲル状態を維持できないため、粘稠化材を必須成分とする。
本発明に好適に用いられる粘稠化材として次のようなものを挙げることができる。
メチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルメチルセルロース、ヒドロキシエチルセルロース等、水溶性有機溶剤にも可溶のセルロース系水溶性高分子などの有機増粘剤；スメクタイト等、水溶性有機溶剤に分散可能な粘土鉱物などの無機増粘剤；炭酸カルシウム、ケイ酸質微粉末等、セメントスラリー分離防止能を有する無機微粉体などを用いることができ、これらのうち、セルロース系水溶性高分子などの有機増粘剤が必ず用いられ、他の粘稠化材をも併用することが好ましい。
The gel-like restoration material of the present invention is a cement, fine aggregate, and a water-soluble organic solvent having a boiling point of 30 to 100 ° C., the cement and fine aggregate are settled and the organic solvent is separated to maintain a uniform gel state. Since this is not possible, the thickener is an essential component.
The following can be mentioned as the thickening material suitably used in the present invention.
Organic thickeners such as cellulose water-soluble polymers that are soluble in water-soluble organic solvents such as methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, and hydroxyethylcellulose; clay minerals that can be dispersed in water-soluble organic solvents such as smectite Inorganic thickeners such as calcium carbonate, siliceous fine powder, etc., inorganic fine powder having the ability to prevent cement slurry separation can be used, and among these, organic thickeners such as cellulose water-soluble polymer are used. It is always used, and it is preferable to use other thickening materials in combination.
本発明のゲル状修復材の粘度は、コンクリート構造物断面欠損部への充填性、作業性の観点から、２０℃で２０Ｐａ・ｓを超え２００Ｐａ・ｓ以下であることを要する。かかる粘度は、セメント、細骨材、沸点が３０〜１００℃の水溶性有機溶剤の混合物に、粘稠化材を加えることによって適宜増粘して粘度調整することができ、あるいは水溶性有機溶剤の量を加減して粘度調整することもできる。
有機増粘剤であるセルロース系水溶性高分子は、通常、セメントと砂の合計１００質量部に対し、０．１〜５質量部の範囲で配合される。
The viscosity of the gel-like restorative material of the present invention is required to be more than 20 Pa · s and not more than 200 Pa · s at 20 ° C. from the viewpoint of the filling property to the cross-section defect portion of the concrete structure and workability. The viscosity can be adjusted by appropriately increasing the viscosity by adding a thickening agent to a mixture of cement, fine aggregate, and a water-soluble organic solvent having a boiling point of 30 to 100 ° C., or a water-soluble organic solvent. Viscosity can be adjusted by adjusting the amount.
The cellulose-based water-soluble polymer that is an organic thickener is usually blended in the range of 0.1 to 5 parts by mass with respect to a total of 100 parts by mass of cement and sand.
本発明のゲル状修復材には、さらにＪＩＳ Ａ ６２０３に規定される再乳化型粉末樹脂を好ましく配合することができる。これら再乳化型粉末樹脂としては、例えば、メチルメタクリレート／ブチルアクリレートなどのポリアクリル酸エステル、スチレン／アクリル酸エステル系コポリマー、スチレンブタジエンゴム（ＳＢＲ）、エチレン酢酸ビニル（ＥＶＡ）、酢酸ビニル／バーサック酸ビニルエステルコポリマー等の樹脂が挙げられる。
これら再乳化型粉末樹脂は、ゲル状修復材塗布後の噴霧水によって再乳化され、コンクリート構造物断面欠損への接着性、付着性を上げる効果がある。耐水性等の耐久性がすぐれるために、アクリル系の再乳化型粉末樹脂の使用が特に好ましい。
再乳化形粉末樹脂の再乳化液は、最低造膜温度が０℃以上であることが望ましい。最低造膜温度が０℃以上であることにより、コンクリートとの付着性がよく、また修復材の表面硬度が硬くなり、早期強度発現性に優れることとなる。
再乳化形粉末樹脂の配合量としては、セメントと細骨材の合計１００質量部に対し、０．１〜５質量部が好ましい。
The gel-like restoration material of the present invention can be preferably further blended with a re-emulsifying powder resin as defined in JIS A6203. Examples of these re-emulsifying powder resins include polyacrylates such as methyl methacrylate / butyl acrylate, styrene / acrylate copolymers, styrene butadiene rubber (SBR), ethylene vinyl acetate (EVA), vinyl acetate / versacic acid. Examples thereof include resins such as vinyl ester copolymers.
These re-emulsification type powder resins are re-emulsified with sprayed water after the application of the gel-like restoration material, and have the effect of increasing the adhesiveness and adhesion to the cross-section defect of the concrete structure. The use of an acrylic re-emulsifying powder resin is particularly preferred because of excellent durability such as water resistance.
The re-emulsified liquid of the re-emulsified powder resin preferably has a minimum film forming temperature of 0 ° C. or higher. When the minimum film-forming temperature is 0 ° C. or higher, the adhesion to concrete is good, the surface hardness of the restoration material is hard, and the early strength development is excellent.
As a compounding quantity of re-emulsification type powder resin, 0.1-5 mass parts is preferable with respect to a total of 100 mass parts of cement and a fine aggregate.
本発明は、コンクリート構造物断面欠損の修復工法を提供する。
それは、清浄化した修復対象部に、上記したゲル状修復材を充填し、水を噴霧するものである。
修復対象部であるコンクリート構造物断面欠損部をエアー又は水により、また場合によってはワイヤーブラシ等を用いて、浮き、脆弱部、ほこり等を除去して表面を清浄化して後、本発明のゲル状修復材をコテやヘラなどを使って充填する。その後、修復部を霧吹きにより水を噴霧する。噴霧水と沸点が３０〜１００℃の水溶性有機溶剤が混ざって置き換わってゆき、有機溶剤は蒸発して、セメントと水との水和反応が起こり、硬化が進行して強度発現する。結果、コンクリート構造物断面欠損が修復される。
The present invention provides a method for repairing a cross-section defect in a concrete structure.
That is, the above-described gel-like restoration material is filled into a cleaned restoration target portion and sprayed with water.
Gel of the present invention after the surface of the concrete structure, which is the restoration target, is removed with air or water, and in some cases with a wire brush or the like, the surface is cleaned by removing floating, weak parts, dust, etc. Fill the shape restoration material with a trowel or spatula. Thereafter, water is sprayed on the restoration part by spraying. Spray water and a water-soluble organic solvent having a boiling point of 30 to 100 ° C. are mixed and replaced, the organic solvent evaporates, a hydration reaction between cement and water occurs, and hardening progresses to develop strength. As a result, the cross-sectional defect of the concrete structure is repaired.
なお、本発明のゲル状修復材は、製造後、プラチューブ・ゴムチューブ・プラ容器・ガラス容器・金属管などの密閉容器中にて保管され、使用に供される。 In addition, the gel-like restoration material of the present invention is stored in a closed container such as a plastic tube, a rubber tube, a plastic container, a glass container, or a metal tube after production and used.
以下に本発明の実施例を挙げて、さらに詳しく本発明を説明する。
実施例１〜７及び比較例１，２
（１）ゲル状修復材の製造
［使用材料］
セメント：ライオンシスイ１０５（住友大阪セメント株式会社製）
細骨材：珪砂６号、７号、８号を同質量混合（土岐砿業株式会社製）
有機溶剤：試薬エタノール９５．５％（関東化学株式会社製）
再乳化形粉末樹脂：モビリスパウダーＤＭ２０７２Ｐ（ニチゴーモビニール株式会社製）
水溶性セルロース：ヒドロキシプロピルセルロースＨＰＣ−Ｍ（日本曹達株式会社製）
スメクタイト：ヘクトライトＢＥＮＴＯＮＥ ＣＴ（エレメンティスジャパン株式会社製）
炭酸カルシウム：ＬＰ２００（近江鉱業株式会社製）
温度２０℃、湿度６０％に制御した室内で、上記材料を表１に示す所定量（単位：質量部）を計量した混合機（千代田技研工業株式会社製；オムニミキサＯＭＮ−１５、容量１５リットル）中に入れ、５分間混合してゲル状修復材を得た。
Hereinafter, the present invention will be described in more detail with reference to examples of the present invention.
Examples 1 to 7 and Comparative Examples 1 and 2
(1) Manufacture of gel-like restoration materials [materials used]
Cement: Lion Sisui 105 (Sumitomo Osaka Cement Co., Ltd.)
Fine aggregate: Silica sand No.6, No.7, No.8 mixed in the same mass (made by Toki Industries Co., Ltd.)
Organic solvent: Reagent ethanol 95.5% (manufactured by Kanto Chemical Co., Inc.)
Re-emulsifying powder resin: Mobilis powder DM2072P (manufactured by Nichigo Mobile Vinyl Co., Ltd.)
Water-soluble cellulose: hydroxypropyl cellulose HPC-M (manufactured by Nippon Soda Co., Ltd.)
Smectite: Hectorite BENTONE CT (Made by Elementis Japan)
Calcium carbonate: LP200 (Omi Mining Co., Ltd.)
A mixer (Chiyoda Giken Kogyo Co., Ltd .; Omnimixer OMN-15, capacity 15 liters) in which a predetermined amount (unit: part by mass) shown in Table 1 was weighed in a room controlled at a temperature of 20 ° C. and a humidity of 60%. It was put in and mixed for 5 minutes to obtain a gel-like restoration material.
（２）ゲル状修復材の物性の測定及び作業性等の評価
［粘度の測定］
１００ｃｃのビーカーにゲル状修復材試料を１００ｃｃ入れ、Ｂ型粘度計（東機産業株式会社製；ＲＢ８０Ｌ）を用い、ロータＮｏ．３を使用し０．３ｒｐｍと０．６ｒｐｍで測定した。
結果を表１に示した。
(2) Measurement of physical properties of gel-like restoration material and evaluation of workability [measurement of viscosity]
In a 100 cc beaker, 100 cc of the gel-like restoration material sample was put, and using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd .; RB80L), rotor No. 3 was measured at 0.3 rpm and 0.6 rpm.
The results are shown in Table 1.
［充填性の評価］
ゲル状修復材試料をコンクリート欠損部にコテ・ヘラを使って充填した。その充填性を下記の基準で評価し、結果を表１に示した。
○：垂直面・上面もダレが発生しない。
△：垂直面はダレが発生しないが、上面ではダレが発生。
×：垂直面でもダレが発生。
[Evaluation of fillability]
The gel restoration material sample was filled into the concrete defect using a trowel and spatula. The filling properties were evaluated according to the following criteria, and the results are shown in Table 1.
○: No sagging occurs on the vertical and upper surfaces.
Δ: Sagging does not occur on the vertical surface, but sagging occurs on the upper surface.
X: Sag is generated even on a vertical surface.
［作業性の評価］
ゲル状修復材試料をコンクリート欠損部にコテ・ヘラを使って充填した際の作業性を下記の基準で評価し、結果を表１に示した。
○：コテやヘラでの充填作業が良好で、隙間なく充填できる。
△：充填作業時にコテ・ヘラ離れが悪くなり、少し隙間ができる。
×：充填作業時にコテ・ヘラ離れが悪く、欠損部との付着も悪くなり、隙間が大きい。
[Evaluation of workability]
The workability when filling a gel-like restoration material sample with a trowel or spatula in a concrete defect was evaluated according to the following criteria, and the results are shown in Table 1.
○: Good filling with a trowel or spatula, and filling is possible without any gaps.
(Triangle | delta): At the time of a filling operation | work, separation of a iron and a spatula worsens and a clearance gap is made a little.
X: The separation of the iron and spatula is poor at the time of filling work, the adhesion to the defective part is also bad, and the gap is large.
［硬化状況の評価］
ゲル状修復材試料をコンクリート欠損部にコテ・ヘラを使って充填した後の硬化状況を下記の基準で評価し、結果を表１に示した。
○：１ｃｍ厚に充填後１２時間以内に硬化する。
△：１ｃｍ厚に充填後１２〜２４時間以内に硬化する。
×：１ｃｍ厚に充填後２４時間以内に硬化しない。
[Evaluation of curing status]
The curing condition after filling the gel-like restoration material sample with a trowel and spatula in the concrete defect portion was evaluated according to the following criteria, and the results are shown in Table 1.
○ Hardened within 12 hours after filling to 1 cm thickness.
Δ: cured to 12 cm after filling to 1 cm thickness.
X: Not cured within 24 hours after filling to 1 cm thickness.
［曲げ強度及び圧縮強度の測定］
曲げ強度と圧縮強度は、それぞれ１０ｍｍ×１０ｍｍ×４０ｍｍと１０ｍｍ×１０ｍｍ×１０ｍｍの型枠中にゲル状修復材試料を充填し、水を噴霧して硬化させ、材齢３日において島津製作所株式会社製「オートグラフＡＧ−Ｇ ５０ｋＮ」を使用して測定した。
結果を表１に示した。
[Measurement of bending strength and compressive strength]
The bending strength and compressive strength were respectively filled with a gel-like restoration material sample in 10 mm × 10 mm × 40 mm and 10 mm × 10 mm × 10 mm molds, and cured by spraying with water. It measured using "Autograph AG-G 50kN" made from a manufacturer.
The results are shown in Table 1.
［付着強度の測定］
基板に４０×４０×１０の型を置きヘラを用いて塗り込むようにゲル状修復材試料を充填し、水を噴霧して硬化させ供試体を作製し、ＪＩＳ Ａ １１７１ 「ポリマーセメントモルタルの試験方法 ７．３ 接着強さ試験」に従い、材齢７日において丸菱科学機械製作所製「接着剥離試験機ＢＡ−８００Ｄ」を使用して付着強度を測定した。
付着強度試験は実施例４及び５について実施した。実施例４の付着強度は１．０ＭＰａであり、実施例５の付着強度は１．４ＭＰａであった。
[Measurement of adhesion strength]
A 40 × 40 × 10 mold is placed on a substrate, filled with a gel-like restoration material sample so as to be applied with a spatula, and sprayed with water to be cured to prepare a test piece. JIS A 1171 “Testing of polymer cement mortar According to “Method 7.3 Adhesive Strength Test”, the adhesion strength was measured using “adhesive peel tester BA-800D” manufactured by Maruhishi Kagaku Seisakusho at a material age of 7 days.
The adhesion strength test was conducted for Examples 4 and 5. The adhesion strength of Example 4 was 1.0 MPa, and the adhesion strength of Example 5 was 1.4 MPa.
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| JP2018053477A (en) * | 2016-09-27 | 2018-04-05 | 積水化学工業株式会社 | Ceiling surface repair method and defoaming tool of concrete structure |
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| JPH09249442A (en) * | 1996-03-12 | 1997-09-22 | Hideo Okazaki | Premix mortar and mortar product |
| JP2003292355A (en) * | 2002-03-29 | 2003-10-15 | Taiheiyo Material Kk | Quick setting agent for shotcrete, production method therefor, and method for application of the shotcrete |
| JP2005187267A (en) * | 2003-12-25 | 2005-07-14 | Taiheiyo Material Kk | Quick hardening admixture |
| JP2005314140A (en) * | 2004-04-27 | 2005-11-10 | Taiheiyo Material Kk | Fluid-state setting material |
| JP2006044960A (en) * | 2004-07-30 | 2006-02-16 | Ube Ind Ltd | Hydraulic composition with improved wet adhesion |
| JP2007191584A (en) * | 2006-01-19 | 2007-08-02 | Sumitomo Osaka Cement Co Ltd | Cement-based aerosol product |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09249442A (en) * | 1996-03-12 | 1997-09-22 | Hideo Okazaki | Premix mortar and mortar product |
| JP2003292355A (en) * | 2002-03-29 | 2003-10-15 | Taiheiyo Material Kk | Quick setting agent for shotcrete, production method therefor, and method for application of the shotcrete |
| JP2005187267A (en) * | 2003-12-25 | 2005-07-14 | Taiheiyo Material Kk | Quick hardening admixture |
| JP2005314140A (en) * | 2004-04-27 | 2005-11-10 | Taiheiyo Material Kk | Fluid-state setting material |
| JP2006044960A (en) * | 2004-07-30 | 2006-02-16 | Ube Ind Ltd | Hydraulic composition with improved wet adhesion |
| JP2007191584A (en) * | 2006-01-19 | 2007-08-02 | Sumitomo Osaka Cement Co Ltd | Cement-based aerosol product |
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| JP2018053477A (en) * | 2016-09-27 | 2018-04-05 | 積水化学工業株式会社 | Ceiling surface repair method and defoaming tool of concrete structure |
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