JP2020158371A - Polymer cement mortar and repair method of reinforced concrete - Google Patents
Polymer cement mortar and repair method of reinforced concrete Download PDFInfo
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Abstract
Description
本発明は、ポリマーセメントモルタル組成物に関する。詳しくは、断面修復材（断面修復用ポリマーセメントモルタル）としても用いることができ、且つ鉄筋コンクリート補修用防せい材としても用いることができるポリマーセメントモルタル組成物に関する。
また、本発明は、鉄筋コンクリートの補修方法に関する。詳しくは、少ない工程で施工できる鉄筋コンクリートの補修方法に関する。
The present invention relates to polymer cement mortar compositions. More specifically, the present invention relates to a polymer cement mortar composition that can be used as a cross-section repair material (polymer cement mortar for cross-section repair) and also as a barrier material for repairing reinforced concrete.
The present invention also relates to a method for repairing reinforced concrete. Specifically, it relates to a method of repairing reinforced concrete that can be constructed in a small number of processes.
鉄筋コンクリートは、トンネルや橋梁等の土木構造物、ビルや一般家屋等の建築構造物に広く使用されている。しかし、これらの鉄筋コンクリート構造物は、二酸化炭素などの酸性ガスによる中性化並びに海水や凍結防止剤等による塩害で、内部の鉄筋が腐食し、補修が必要になることがある。 Reinforced concrete is widely used in civil engineering structures such as tunnels and bridges, and building structures such as buildings and general houses. However, these reinforced concrete structures may need to be repaired due to corrosion of the internal reinforcing bars due to neutralization by acid gas such as carbon dioxide and salt damage caused by seawater or antifreeze agents.
鉄筋コンクリートが酷く劣化した場合は、劣化したコンクリートを除去した後、露出した鉄筋の錆を除去・防錆処理（防錆剤の塗布）した後に、コンクリートの断面欠損部分をモルタル又はコンクリートで修復することが行われ、そのような補修方法が提案されている（例えば、特許文献１〜３参照。）。 If the reinforced concrete is severely deteriorated, remove the deteriorated concrete, remove the rust on the exposed reinforcing bars, apply rust preventive treatment (apply rust preventive agent), and then repair the defective part of the concrete with mortar or concrete. Has been carried out, and such a repair method has been proposed (see, for example, Patent Documents 1 to 3).
しかし、従来から行われてきた上記のような鉄筋コンクリートの補修方法は、補修方法として優れているものの、より簡素で工程を省略しても、補修した部分の鉄筋を充分に防錆した上で補修できる鉄筋コンクリートの補修方法が望まれていた。 However, although the above-mentioned reinforced concrete repair method that has been conventionally performed is excellent as a repair method, it is simpler and even if the process is omitted, the repaired part of the reinforced concrete is sufficiently rust-proofed before repair. A method for repairing reinforced concrete that can be made has been desired.
本発明は前記問題の解決、即ち、本発明は、鉄筋コンクリート補修用防せい材及び断面修復材として使用可能なポリマーセメントモルタル組成物を提供することを目的とする。また、本発明は、より簡素で、補修した部分の鉄筋を充分に防錆した上で補修できる鉄筋コンクリートの補修方法を提供することを目的とする。 An object of the present invention is to solve the above-mentioned problems, that is, to provide a polymer cement mortar composition that can be used as a reinforced concrete repair protective material and a cross-section repair material. Another object of the present invention is to provide a simpler method for repairing reinforced concrete, which can repair the repaired portion of the reinforcing bar after sufficiently preventing rust.
本発明者は、前記課題解決のため鋭意検討した結果、セメントと、亜硝酸塩、ポリマーディスパージョン、膨張材、フライアッシュ、遅延剤、消泡剤、有機繊維及び細骨材を含有し、特定の亜硝酸イオン量となる亜硝酸塩を含み且つポリマーセメントモルタル中の骨材を除いたペーストの量が特定の量とすることにより、上記課題を解決できることを見出し、本発明を完成させた。即ち、本発明は、以下の（１）又は（２）で表すポリマーセメントモルタル、並びに（３）で表す鉄筋コンクリートの補修方法である。
（１）（Ａ）亜硝酸塩、（Ｂ）セメント、（Ｃ）ポリマーディスパージョン、（Ｄ）膨張材、（Ｅ）フライアッシュ、（Ｆ）遅延剤、（Ｇ）消泡剤、（Ｈ）有機繊維、及び（Ｉ）細骨材を含有し、（Ａ）亜硝酸塩含有量がポリマーセメントモルタル中の亜硝酸イオン量が１〜１００kg／ｍ３となる量であり、ポリマーセメントモルタル中の骨材を除いたペーストの量が７００〜１２５０kg／ｍ３であることを特徴とするポリマーセメントモルタル。
（２）（Ｂ）セメント１００質量部に対し、（Ｃ）ポリマーディスパージョンを２〜２０質量部、（Ｄ）膨張材を３〜２０質量部、（Ｅ）フライアッシュを５〜５０質量部、（Ｆ）遅延剤を０．０５〜２質量部、（Ｇ）消泡剤を０．０５〜０．５質量部、（Ｈ）有機繊維を０．２〜２質量部含有することを特徴とする上記（１）に記載のポリマーセメントモルタル。
（３）鉄筋コンクリートの劣化部分のコンクリートを当該部分に埋設されている鉄筋が露出するように除去する工程（Ａ）と、前記工程（Ａ）により露出した鉄筋に発生している錆を除去する工程（Ｂ）と、工程（Ａ）で形成された断面欠損部を上記（１）又は（２）のポリマーセメントモルタルで埋め戻す工程（Ｃ）とを具備することを特徴とする鉄筋コンクリートの補修方法。
As a result of diligent studies to solve the above problems, the present inventor contains cement, nitrite, polymer dispersion, swelling material, fly ash, retarder, antifoaming agent, organic fiber and fine aggregate, and is specific. We have found that the above problems can be solved by setting the amount of the paste containing nitrite, which is the amount of nitrite ion, and excluding the aggregate in the polymer cement mortar to a specific amount, and completed the present invention. That is, the present invention is a method for repairing a polymer cement mortar represented by the following (1) or (2) and a reinforced concrete represented by (3).
(1) (A) nitrite, (B) cement, (C) polymer dispersion, (D) swelling material, (E) fly ash, (F) retarder, (G) defoamer, (H) organic It contains fibers and (I) fine aggregate, and (A) the nitrite content is an amount such that the amount of nitrite ion in the polymer cement mortar is 1 to 100 kg / m 3, and the aggregate in the polymer cement mortar. A polymer cement mortar characterized in that the amount of the paste excluding the above is 700 to 1250 kg / m 3 .
(2) (B) 100 parts by mass of cement, (C) 2 to 20 parts by mass of polymer dispersion, (D) 3 to 20 parts by mass of expansion material, (E) 5 to 50 parts by mass of fly ash, It is characterized by containing (F) 0.05 to 2 parts by mass of a retarding agent, (G) 0.05 to 0.5 parts by mass of a defoaming agent, and (H) 0.2 to 2 parts by mass of organic fibers. The polymer cement mortar according to (1) above.
(3) A step (A) of removing the concrete of the deteriorated portion of the reinforced concrete so that the reinforcing bar embedded in the portion is exposed, and a step of removing rust generated on the reinforcing bar exposed by the step (A). A method for repairing reinforced concrete, which comprises (B) and a step (C) of backfilling the cross-sectional defect formed in the step (A) with the polymer cement mortar of the above (1) or (2).
本発明によれば、鉄筋コンクリート補修用防せい材及び断面修復材として使用可能なポリマーセメントモルタルが得られる。また、本発明によれば、より簡素で工程が少なく、補修した部分の鉄筋を充分に防錆した上で補修できる鉄筋コンクリートの補修方法が得られる。 According to the present invention, a polymer cement mortar that can be used as a reinforced concrete repair preventive material and a cross-section repair material can be obtained. Further, according to the present invention, it is possible to obtain a method for repairing reinforced concrete, which is simpler and has fewer steps, and can repair the repaired portion of the reinforcing bar after sufficiently preventing rust.
本発明のポリマーセメントモルタルは（Ａ）亜硝酸塩、（Ｂ）セメント、（Ｃ）ポリマーディスパージョン、（Ｄ）膨張材、（Ｅ）フライアッシュ、（Ｆ）遅延剤、（Ｇ）消泡剤、（Ｈ）有機繊維、及び（Ｉ）細骨材を含有し、（Ａ）亜硝酸塩含有量がポリマーセメントモルタル中の亜硝酸イオン量が１〜１００kg／ｍ３となる量であり、ポリマーセメントモルタル中の骨材を除いたペーストの量が７００〜１２５０kg／ｍ３であることを特徴とする。 The polymer cement mortar of the present invention comprises (A) nitrite, (B) cement, (C) polymer dispersion, (D) swelling material, (E) fly ash, (F) retarder, (G) defoamer, It contains (H) organic fiber and (I) fine aggregate, and (A) the nitrite content is an amount such that the amount of nitrite ion in the polymer cement mortar is 1 to 100 kg / m 3 , and the polymer cement mortar. The amount of the paste excluding the aggregate inside is 700 to 1250 kg / m 3 .
本発明のポリマーセメントモルタルは、鉄筋コンクリートの補修方法に用いる。本発明のポリマーセメントモルタルは、セメント（成分（Ｂ））１００質量部に対し、３０〜９０質量部の水を含有することが好ましい。この範囲であると混練し易く、左官作業や吹付け作業が行い易い。また、寸法安定性にも優れ、壁面や天井面に塗付けても垂れ及び変形が起こり難い。セメント（成分（Ｂ））１００質量部に対し、３０質量部未満であると、混練し難く、混練できても左官作業やモルタル吹付け作業は行い難い。また、９ ０質量部を超えると、寸法安定性が悪くなり、ひび割れの発生の虞が高まる。更に、モルタルをコン クリート壁面に塗付けた場合に、初期に垂れ又は変形が起こり易い。混練し易く、左官作業及びモル タル吹付け作業が行い易く、壁面に塗付けても垂れ及び変形が起こり難いことから、含有するセメント１００質量部に対して３５〜６０質量部の水を含有することが、より好ましい。尚、使用する水の量は、水溶液やエマルション等の水を溶媒や分散媒とする液状の混和材料に含まれる水量も考慮したものとする。本発明のポリマーセメントモルタルを混練するときは、モルタルミキサやコンクリートミキサ等のミキサで混練し製造することが好ましい。用いることのできるミキサとしては連続式ミキサでもバッチ式ミキサでも良く、例えばパン型コンクリートミキサ、パグミル型コンクリートミキサ、重力式コンクリートミキサ、グラウトミキサ、ハンドミキサ、左官ミキサ等が挙げられる。 The polymer cement mortar of the present invention is used in a method for repairing reinforced concrete. The polymer cement mortar of the present invention preferably contains 30 to 90 parts by mass of water with respect to 100 parts by mass of cement (component (B)). Within this range, kneading is easy, and plastering work and spraying work are easy to perform. In addition, it has excellent dimensional stability, and even if it is applied to a wall surface or ceiling surface, it is unlikely to sag or deform. If it is less than 30 parts by mass with respect to 100 parts by mass of cement (component (B)), it is difficult to knead, and even if it can be kneaded, plastering work and mortar spraying work are difficult to perform. On the other hand, if it exceeds 90 parts by mass, the dimensional stability deteriorates and the possibility of cracking increases. Furthermore, when mortar is applied to the concrete wall surface, dripping or deformation is likely to occur at the initial stage. Since it is easy to knead, plastering work and mortar spraying work are easy, and dripping and deformation are unlikely to occur even when applied to the wall surface, it contains 35 to 60 parts by mass of water with respect to 100 parts by mass of the cement contained. Is more preferable. The amount of water used shall also take into consideration the amount of water contained in the liquid admixture using water such as an aqueous solution or emulsion as a solvent or dispersion medium. When the polymer cement mortar of the present invention is kneaded, it is preferably produced by kneading with a mixer such as a mortar mixer or a concrete mixer. The mixer that can be used may be a continuous type mixer or a batch type mixer, and examples thereof include a pan-type concrete mixer, a pug mill-type concrete mixer, a gravity-type concrete mixer, a grout mixer, a hand mixer, and a plastering mixer.
本発明のポリマーセメントモルタルに用いるセメント（成分（Ｂ））は、水硬性セメントであればよく、例えば普通、早強、超早強、低熱及び中庸熱の各種ポルトランドセメント、エコセメント、アルミナセメント、並びにこれらの水硬性セメントに、フライアッシュ、高炉スラグ、シリカフューム又は石灰石微粉末等を混合した各種混合セメント等が挙げられ、これらの一種又は二種以上を使用することができる。本発明に用いるセメントとしては、左官施工し易いことから、珪酸カルシウムを主成分とするセメント又はアルミナセメントを主体としたセメントが好ましい。ここで珪酸カルシウムを主成分とするとは、含まれるセメントクリンカ粉砕物中において珪酸カルシウム鉱物（Ｃ３Ｓ、Ｃ２Ｓ）を５０質量％以上含むことをいい、好ましくは６０質量％以上含むことをいい、より好ましくは７０質量％以上含むことをいう。また、材齢１日において高い強度を得易いことから、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、エコセメント及びアルミナセメントから選ばれる一種又は二種以上を使用することが更に好ましい。 The cement (component (B)) used in the polymer cement mortar of the present invention may be water-hard cement, for example, various Portland cements, eco-cements, alumina cements, ordinary, fast-strength, ultra-fast-strength, low-heat and moderate-heat. Examples of these water-hard cements include various mixed cements in which fly ash, blast furnace slag, silica fume, fine limestone powder, etc. are mixed, and one or more of these can be used. As the cement used in the present invention, a cement containing calcium silicate as a main component or a cement mainly composed of alumina cement is preferable because it is easy to plaster. Here, the a main component calcium silicate refers to include calcium silicate mineral (C 3 S, C 2 S ) at least 50 wt% in the cement clinker grind included, that preferably comprise more than 60 wt% It means that it contains 70% by mass or more more preferably. Further, it is more preferable to use one or more kinds selected from ordinary Portland cement, early-strength Portland cement, ultra-early-strength Portland cement, eco-cement and alumina cement because high strength can be easily obtained in one day of age. ..
本発明のポリマーセメントモルタルに用いる亜硝酸塩（成分（Ａ））は、亜硝酸カルシウム、亜硝酸リチウムが好適な例として挙げられる。本発明において、亜硝酸塩含有量は、ポリマーセメントモルタル中の亜硝酸イオン量が１〜１００kg／ｍ３となる量である。ポリマーセメントモルタル中の亜硝酸イオン量が１kg／ｍ３未満となる量の亜硝酸塩含有量では、防せい性が不充分で、日本建築学会の「鉄筋コンクリート補修用防せい材の品質基準（案）」（鉄筋コンクリート造建築物の耐久性調査・診断および補修指針（案）・同解説の付録１．３）で規定される品質基準を、ポリマーセメントモルタルが満たさない。また、ポリマーセメントモルタル中の亜硝酸イオン量が１００kg／ｍ３を超える量の亜硝酸塩含有量では、亜硝酸塩が亜硝酸カルシウムの場合は、硬化が早すぎて断面欠損部への塗布ができず、亜硝酸塩が亜硝酸リチウムの場合は、硬化遅延を起こし、低温時に硬化不良を起こす虞がある。本発明における好ましい亜硝酸塩含有量は、ポリマーセメントモルタル中の亜硝酸イオン量が２〜２０kg／ｍ３となる量、更にはポリマーセメントモルタル中の亜硝酸イオン量が２〜１０kg／ｍ３となる量である。 As the nitrite (component (A)) used in the polymer cement mortar of the present invention, calcium nitrite and lithium nitrite are preferable examples. In the present invention, the nitrite content is an amount such that the amount of nitrite ion in the polymer cement mortar is 1 to 100 kg / m 3 . If the amount of nitrite ion in the polymer cement mortar is less than 1 kg / m 3, the nitrite content is insufficient, and the Japan Institute of Architecture's "Quality Standards for Reinforced Concrete Repair Shields (Draft)" (Durability survey / diagnosis and repair guidelines (draft) of reinforced concrete buildings / Appendix 1.3 of the same commentary) does not meet the quality standards specified by polymer cement mortar. Also, the nitrite content amounts nitrite ion amount of polymer cement mortar of greater than 100 kg / m 3, when nitrite is calcium nitrite, curing is too fast can not applied to the cross defect If the nitrite is lithium nitrite, curing may be delayed and curing failure may occur at low temperatures. The preferable nitrite content in the present invention is an amount in which the amount of nitrite ion in the polymer cement mortar is 2 to 20 kg / m 3, and further, the amount of nitrite ion in the polymer cement mortar is 2 to 10 kg / m 3. The amount.
本発明に用いるポリマーディスパージョン（成分（Ｃ））としては、ポリマーセメントモルタルやポリマーセメントコンクリートの結合材として用いられるものであればよく、例えば、スチレン・ブタジエン共重合体，クロロプレンゴム，アクリロニトリル・ブタジエン共重合体又はメチルメタクリレート・ブタジエン共重合体等の合成ゴム、天然ゴム、ポリエチレンやポリプロピレン等のポリオレフィン、ポリクロロピレン、ポリアクリル酸エステル、スチレン・アクリル共重合体、オールアクリル共重合体、ポリ酢酸ビニル，酢酸ビニル・アクリル共重合体，酢酸ビニル・アクリル酸エステル共重合体，変性酢酸ビニル，エチレン・酢酸ビニル共重合体，エチレン・酢酸ビニル・塩化ビニル共重合体，酢酸ビニルビニルバーサテート共重合体，アクリル・酢酸ビニル・ベオバ（t-デカン酸ビニルの商品名）共重合体等の酢酸ビニル系樹脂、不飽和ポリエステル樹脂、ポリウレタン樹脂、アルキド樹脂及びエポキシ樹脂等の合成樹脂、アスファルト，ゴムアスファルト及びパラフィン等の瀝青質等が好ましい例として挙げられ、これらの１種又は２種以上を用いることができる。下地との接着が良いという理由から、本発明に使用するポリマーディスパージョンとしては、ポリ酢酸ビニル，酢酸ビニル・アクリル共重合体，酢酸ビニル・アクリル酸エステル共重合体，変性酢酸ビニル，エチレン・酢酸ビニル共重合体，エチレン・酢酸ビニル・塩化ビニル共重合体，酢酸ビニルビニルバーサテート共重合体，アクリル・酢酸ビニル・ベオバ（t-デカン酸ビニルの商品名）共重合体等の酢酸ビニル系樹脂；ポリアクリル酸エステル，ポリメタクリル酸エステル，アクリル酸エステル・スチレン共重合体，スチレン・アクリル共重合体，オールアクリル共重合体等のアクリル系樹脂；ポリエチレン及びポリプロピレン等のポリオレフィン系樹脂；スチレン・ブタジエン共重合体，クロロプレンゴム，アクリロニトリル・ブタジエン共重合体又はメチルメタクリレート・ブタジエン共重合体等の合成ゴムから選ばれる１種又は２種以上を用いることが好ましい。ポリマーディスパージョンは、上記樹脂を水に乳化して安定化された液体状のもの（ポリマーエマルション）、又は水により再乳化するものであれば粉末状（再乳化型粉末樹脂）でもよく、何れか１種又は２種以上を併用してもよい。ポリマーディスパージョンの含有量は、１０５℃における不揮発性分（以下「固形分」という。）換算で、セメント(成分（Ｂ））１００質量部に対し、２〜２０質量部とすることが好ましい。２質量部未満では、下地への付着強度が劣るほか、耐中性化、耐凍結融解性、耐水性などの効果が不足する。また、２０質量部を超えるとポリマーセメントモルタルが高粘性となるため 、混練時の抵抗の増大や施工時の作業性の低下をもたらし、硬化遅延により塗布したポリマーセメントモルタルが垂れる虞がある。下地への付着強度が高く且つ粘性が抑えられ施工時の作業性に優れることから、ポリマーディスパージョンの含有量は、固形分換算でセメント(成分（Ｂ））１００質量部に対し、５〜１５質量部とすることがより好ましい。 The polymer dispersion (component (C)) used in the present invention may be any as long as it is used as a binder for polymer cement mortar and polymer cement concrete. For example, styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene. Synthetic rubber such as copolymer or methyl methacrylate / butadiene copolymer, natural rubber, polyolefin such as polyethylene or polypropylene, polychloropyrene, polyacrylic acid ester, styrene / acrylic copolymer, all-acrylic copolymer, polyvinyl acetate , Vinyl acetate / acrylic copolymer, vinyl acetate / acrylic acid ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate versatate copolymer , Acrylic / Vinyl acetate / Beova (trade name of t-vinyl decanoate) Polymers and other vinyl acetate resins, unsaturated polyester resins, polyurethane resins, alkyd resins and epoxy resins and other synthetic resins, asphalt, rubber asphalt and Bituminous substances such as paraffin are preferable examples, and one or more of these can be used. The polymer dispersion used in the present invention includes polyvinyl acetate, vinyl acetate / acrylic copolymer, vinyl acetate / acrylic acid ester copolymer, modified vinyl acetate, and ethylene / acetate because of its good adhesion to the substrate. Vinyl acetate resins such as vinyl copolymers, ethylene / vinyl acetate / vinyl chloride copolymers, vinyl acetate vinyl versatate copolymers, acrylic / vinyl acetate / beova (trade name of t-vinyl decanoate) copolymers, etc. Acrylic resins such as polyacrylic acid ester, polymethacrylic acid ester, acrylic acid ester / styrene copolymer, styrene / acrylic copolymer, all-acrylic copolymer; polyolefin resin such as polyethylene and polypropylene; styrene / butadiene It is preferable to use one or more selected from synthetic rubbers such as copolymers, chloroprene rubbers, acrylonitrile / butadiene copolymers, and methyl methacrylate / butadiene copolymers. The polymer dispersion may be a liquid (polymer emulsion) stabilized by emulsifying the above resin in water, or a powder (re-emulsified powder resin) as long as it is re-emulsified with water. One kind or two or more kinds may be used together. The content of the polymer dispersion is preferably 2 to 20 parts by mass with respect to 100 parts by mass of cement (component (B)) in terms of non-volatile content (hereinafter referred to as "solid content") at 105 ° C. If it is less than 2 parts by mass, the adhesion strength to the substrate is inferior, and the effects such as neutralization resistance, freeze-thaw resistance, and water resistance are insufficient. Further, if it exceeds 20 parts by mass, the polymer cement mortar becomes highly viscous, which causes an increase in resistance during kneading and a decrease in workability during construction, and there is a risk that the applied polymer cement mortar will drip due to a delay in curing. Since the adhesion strength to the substrate is high, the viscosity is suppressed, and the workability during construction is excellent, the content of the polymer dispersion is 5 to 15 with respect to 100 parts by mass of cement (component (B)) in terms of solid content. It is more preferable to use parts by mass.
本発明に用いる膨張材（成分（Ｄ））としては、水和反応により、エトリンガイトや水酸化カルシウムを生成するものであればよく、カルシウムサルフォアルミネート系（エトリンガイト系）膨張材、カルシウムアルミノフェライト系膨張材、（生）石灰系膨張材、エトリンガイト−石灰複合系膨張材及び石膏系膨張材等が挙げられ、これらの一種又は二種以上が使用可能であり好ましい。膨張材を含有することにより、硬化後のポリマーセメントモルタルの収縮が抑制されてひび割れが発生し難くなることに加え、高い寸法安定性 が得られるため、下地となるコンクリートや鉄筋との一体性が保たれる。膨張材の含有量はセメント (成分（Ｂ））１００質量部に対し、２〜２０質量部とすることが好ましく、２質量部未満では、収縮抑制効果が得られ難く、２０質量部を超えると過膨張を起こす虞がある。より好ましい膨張材の含有量は、セメント (成分（Ｂ））１００質量部に対し、３〜１５質量部とし、更に好ましくは、５〜１０質量部とする。 The expansion material (component (D)) used in the present invention may be any one that produces ettringite or calcium hydroxide by a hydration reaction, and is a calcium gypsumate-based (ettringite-based) expansion material or calcium aluminoferrite. Examples thereof include system expansion materials, (raw) lime expansion materials, ettringite-lime composite expansion materials and gypsum expansion materials, and one or more of these can be used and is preferable. By containing the expansive material, the shrinkage of the polymer cement mortar after curing is suppressed and cracks are less likely to occur, and high dimensional stability is obtained, so that it is integrated with the underlying concrete and reinforcing bars. Be kept. The content of the expanding material is preferably 2 to 20 parts by mass with respect to 100 parts by mass of cement (component (B)), and if it is less than 2 parts by mass, it is difficult to obtain a shrinkage suppressing effect, and if it exceeds 20 parts by mass. There is a risk of overexpansion. The content of the expanding material is more preferably 3 to 15 parts by mass, and further preferably 5 to 10 parts by mass with respect to 100 parts by mass of cement (component (B)).
本発明のポリマーセメントモルタルは、フライアッシュ（成分（Ｅ））を含有することから、鏝伸び性、鏝切れ性、表面平滑性等の鏝作業性に優れ、鉄筋の凹凸に緻密した状態で断面欠損部に充填し易い。本発明のポリマーセメントモルタル組成物に用いるフライアッシュ（成分（Ｅ））は、フライアッシュであれば特に限定されないが、規格（ＪＩＳ Ａ ６２０１「コンクリート用フライアッシュ」）に適合するものであれば、鏝伸び性、鏝切れ性、表面平滑性等の鏝作業性に安定して優れ、更にポンプ圧送性にも安定して優れることから好ましい。本発明のポリマーセメントモルタルにおけるフライアッシュ（成分（Ｅ））の配合割合は、セメント（成分（Ｂ））１００質量部に対し５〜５０質量部とする。この範囲の配合割合でフライアッシュを含有することで、左官施工時の鏝作業性及び吹付け施工時のポンプ圧送性に優れる。５質量部未満では成分（Ｅ）を含有させた効果が小さい。また、５０質量部を超えると、コンシステンシーを得るための混練水量が増すために、乾燥収縮が大きくなり寸法安定性に問題が生じ易くなる。左官施工時の鏝作業性がよく、吹付け施工時のポンプ圧送性もよい、つまり、作業性に優れることから、本発明のポリマーセメントモルタルにおけるフライアッシュ（成分（Ｅ））の配合割合は、セメント（成分（Ｂ））１００質量部に対し１０〜３０質量部とすることがより好ましく、１０〜２０質量部とすることが更に好ましい。 Since the polymer cement mortar of the present invention contains fly ash (component (E)), it has excellent trowel workability such as trowel elongation, trowel cutting property, and surface smoothness, and has a cross section in a state of being densely arranged on the unevenness of the reinforcing bar. Easy to fill the defect. The fly ash (component (E)) used in the polymer cement mortar composition of the present invention is not particularly limited as long as it is fly ash, as long as it conforms to the standard (JIS A 6201 "fly ash for concrete"). It is preferable because it is stable and excellent in trowel workability such as trowel elongation, trowel breaking property, and surface smoothness, and is also stable and excellent in pump pumping property. The mixing ratio of fly ash (component (E)) in the polymer cement mortar of the present invention is 5 to 50 parts by mass with respect to 100 parts by mass of cement (component (B)). By containing fly ash in a blending ratio within this range, it is excellent in trowel workability during plastering work and pump pumping property during spraying work. If it is less than 5 parts by mass, the effect of containing the component (E) is small. On the other hand, if it exceeds 50 parts by mass, the amount of kneading water for obtaining consistency increases, so that drying shrinkage becomes large and a problem of dimensional stability tends to occur. Since the trowel workability during plastering work is good and the pumping workability during spraying work is also good, that is, the workability is excellent, the mixing ratio of fly ash (component (E)) in the polymer cement mortar of the present invention is The amount is more preferably 10 to 30 parts by mass, and further preferably 10 to 20 parts by mass with respect to 100 parts by mass of the cement (component (B)).
本発明に用いる遅延剤（成分（Ｆ））としては、セメントの水和反応を遅らせるものであれば、 特に限定されない。好ましくはクエン酸、酒石酸、グルコン酸、ヘプトン酸等の有機カルボン酸及びその塩、リグニンスルホン酸及びその塩、可溶性デンプンから選ばれる１種又は2種以上を用いる。本発明における遅延剤（成分（Ｆ））の含有量は、可使時間が得易く且つ高い強度を得易いことから、セメント（成分（Ｂ））１００質量部に対し０．０５〜２質量部とする。より好ましい遅延剤（成分（Ｆ））の含有量は、可使時間及び強度の点で、セメント（成分（Ｂ））１００質量部に対し０．０５〜１．５質量部とする。 The retarder (component (F)) used in the present invention is not particularly limited as long as it delays the hydration reaction of cement. Preferably, one or more selected from organic carboxylic acids such as citric acid, tartaric acid, gluconic acid, and heptonic acid and salts thereof, lignin sulfonic acid and salts thereof, and soluble starch are used. The content of the retarding agent (component (F)) in the present invention is 0.05 to 2 parts by mass with respect to 100 parts by mass of cement (component (B)) because it is easy to obtain pot life and high strength. And. The content of the more preferable retarder (component (F)) is 0.05 to 1.5 parts by mass with respect to 100 parts by mass of the cement (component (B)) in terms of pot life and strength.
本発明のポリマーセメントモルタルは、消泡剤（成分（Ｇ））を含有することから、混練中に発生するエントラップエアやエントレンドエアを抜くことができ、鉄筋との付着面積が増すために、鉄筋に対する付着強度が高い。本発明に用いる消泡剤（成分（Ｇ））としては、その種類は限定されないが、例えば、市販のセメント用消泡剤、市販のセメントモルタル用消泡剤又は市販のコンクリート用消泡剤の他、他用途の鉱物油系、ポリエーテル系、シリコーン系、脂肪酸エステル系等の消泡剤、トリブチルフォスフェート、ポリジメチルシロキサン又はポリオキシアルキレンアルキルエーテル系非イオン界面活性剤が好適な例として挙げられ、これらの１種又は２種以上を用いることができる。また、本発明に用いる消泡剤としては、液体のものでも粉末状のものでもよい。本発明における消泡剤（成分（Ｇ））の含有量は、ポリマーセメントモルタルの鉄筋に対する付着強度が高いことから、セメント（成分（Ｂ））１００質量部に対し０．０５〜０．５質量部とする。より好ましい遅延剤（成分（Ｆ））の含有量は、可使時間及び強度の点で、セメント（成分（Ｂ））１００質量部に対し０．１〜０．３質量部とする Since the polymer cement mortar of the present invention contains a defoaming agent (component (G)), it is possible to remove the entrap air and the entrend air generated during kneading, and the adhesion area with the reinforcing bar is increased. , High adhesion strength to reinforcing bars. The type of the defoaming agent (component (G)) used in the present invention is not limited, but for example, a commercially available defoaming agent for cement, a commercially available defoaming agent for cement mortar, or a commercially available defoaming agent for concrete. Other suitable examples include defoamers such as mineral oil-based, polyether-based, silicone-based, and fatty acid ester-based defoamers for other uses, tributylphosphate, polydimethylsiloxane, and polyoxyalkylene alkyl ether-based nonionic surfactants. And one or more of these can be used. The defoaming agent used in the present invention may be a liquid or a powder. The content of the defoaming agent (component (G)) in the present invention is 0.05 to 0.5 mass by mass with respect to 100 parts by mass of the cement (component (B)) because the adhesive strength of the polymer cement mortar to the reinforcing bar is high. It is a department. The content of the more preferable retarder (component (F)) is 0.1 to 0.3 parts by mass with respect to 100 parts by mass of cement (component (B)) in terms of pot life and strength.
本発明のポリマーセメントモルタルは、有機繊維（成分（Ｇ））を含有することから、寸法安定性に優れ、下地との高い接着力が得られる。本発明に用いる有機繊維（成分（Ｇ））としては、種類は限定されず、例えば、ビニロン繊維、アクリル繊維、ナイロン繊維、ポリプロピレン繊維、セルロース繊維、ポリエチレン繊維などが好適な例として挙げられ、これらの１種又は２種以上を用いることができる。本発明における有機繊維（成分（Ｇ））を含有量は、より寸法安定性に優れ且つ下地との高い接着力が得られることから、セメント（成分（Ｂ））１００質量部に対し０．２〜２質量部とする。より好ましくは、０．５〜１質量部とする。 Since the polymer cement mortar of the present invention contains organic fibers (component (G)), it has excellent dimensional stability and high adhesive strength to the substrate can be obtained. The type of organic fiber (component (G)) used in the present invention is not limited, and examples thereof include vinylon fiber, acrylic fiber, nylon fiber, polypropylene fiber, cellulose fiber, polyethylene fiber, and the like. One or more of the above can be used. The content of the organic fiber (component (G)) in the present invention is 0.2 with respect to 100 parts by mass of the cement (component (B)) because it is more excellent in dimensional stability and a high adhesive force to the substrate can be obtained. ~ 2 parts by mass. More preferably, it is 0.5 to 1 part by mass.
本発明に用いる細骨材（成分（Ｉ））としては、モルタルやコンクリートで使用可能なものであればよく、例えば珪砂、石灰石砕砂等の砕砂、川砂、陸砂、海砂、人工軽量細骨材、パーライトやシラスバルーン等の無機質発泡粒、ポリスチレン粒やチレン酢酸エビニル粒等の有機質軽量骨材、高炉スラグ細骨材や電気炉酸化スラグ細骨材等のスラグ細骨材等の他、セメントクリンカ粒（セメントとして市販されているセメントクリンカ粉末よりも粗い粒状のもの）が使用可能で、これらの２種以上を併用してもよい。本発明に用いる細骨材（成分（Ｉ））としては、下地に対する付着力が高いことから、無機質発泡粒及び有機質軽量骨材以外のものが好ましく、更に人工軽量細骨材を除いたものから選ばれる1種又は２種以上のものがより好ましい。 The fine aggregate (component (I)) used in the present invention may be any material that can be used in mortar or concrete, for example, crushed sand such as silica sand and limestone crushed sand, river sand, land sand, sea sand, and artificial lightweight fine bone. In addition to materials, inorganic foam particles such as pearlite and silas balloons, organic lightweight aggregates such as polystyrene particles and vinyl acetate granules, slag fine aggregates such as blast furnace slag fine aggregate and electric furnace oxidized slag fine aggregate, and cement. Clinker grains (grains coarser than cement clinker powder commercially available as cement) can be used, and two or more of these may be used in combination. The fine aggregate (component (I)) used in the present invention is preferably one other than inorganic foamed grains and organic lightweight aggregate because of its high adhesion to the substrate, and further excludes artificial lightweight fine aggregate. One or more selected ones are more preferable.
本発明において、ポリマーセメントモルタル中の骨材を除いたペーストの量は、７００〜１２５０kg／ｍ３であるので、異形鉄筋の凹凸に応じてポリマーセメントモルタルが鉄筋に密着することができ、防せい材としての効果を発揮できるとともに、鉄筋に対する高い付着力が得られる。ペーストの量が７００kg／ｍ３未満では、骨材が多過ぎ、異形鉄筋の凹凸に応じてポリマーセメントモルタルが鉄筋に密着することができない場合があり、防せい性能及び／又は鉄筋に対する付着力が不足することがある。また、ペーストの量が１２５０kg／ｍ３を超えると、水和熱や乾燥収縮によるひび割れが発生し易くなり、下地との一体性が不足する場合、又は防せい性が低いことがある。異形鉄筋の凹凸に応じてポリマーセメントモルタルが鉄筋に密着し易く、且つひび割れが発生し難いことから、ポリマーセメントモルタル中の骨材を除いたペーストの量は、９００〜１２００kg／ｍ３とすることが好ましい。 In the present invention, the amount of the paste excluding the aggregate in the polymer cement mortar is 700 to 1250 kg / m 3 , so that the polymer cement mortar can adhere to the reinforcing bar according to the unevenness of the deformed reinforcing bar, which prevents it. It can exert its effect as a material and can obtain high adhesive force to reinforcing bars. If the amount of paste is less than 700 kg / m 3 , the amount of aggregate is too large, and the polymer cement mortar may not be able to adhere to the reinforcing bar depending on the unevenness of the deformed reinforcing bar, and the protective performance and / or the adhesive force to the reinforcing bar may be poor. There may be a shortage. On the other hand, if the amount of the paste exceeds 1250 kg / m 3 , cracks are likely to occur due to heat of hydration and drying shrinkage, and the integrity with the base may be insufficient or the preventive property may be low. Since the polymer cement mortar easily adheres to the reinforcing bar and cracks are unlikely to occur depending on the unevenness of the deformed reinforcing bar, the amount of the paste excluding the aggregate in the polymer cement mortar should be 900 to 1200 kg / m 3. Is preferable.
本発明のポリマーセメントモルタルには、、本発明の効果を喪失させない限り、上記の（Ａ）亜硝酸塩、（Ｂ）セメント、（Ｃ）ポリマーディスパージョン、（Ｄ）膨張材、（Ｅ）フライアッシュ、（Ｆ）遅延剤、（Ｇ）消泡剤、（Ｈ）有機繊維、及び（Ｉ）細骨材以外の成分を含んでいてもよい。このような成分としては、例えば、高性能減水剤や高性能ＡＥ減水剤等のセメント分散剤、防水材、防錆剤、収縮低減剤、顔料、上記以外の繊維、撥水剤、白華防止剤、急結剤（材）、急硬剤（材）、凝結遅延剤、発泡剤、消石灰、シリカフューム、火山灰、高炉スラグ粉末等のスラグ粉末、空気連行剤、表面硬化剤等の混和材料、並びに川砂利、陸砂利、砕石等の粗骨材が挙げられる。 The polymer cement mortar of the present invention contains the above-mentioned (A) nitrite, (B) cement, (C) polymer dispersion, (D) expansion material, and (E) fly ash as long as the effects of the present invention are not lost. , (F) Delaying agent, (G) Defoaming agent, (H) Organic fiber, and (I) Fine aggregate may contain components other than. Examples of such components include cement dispersants such as high-performance water reducing agents and high-performance AE water reducing agents, waterproofing materials, rust preventives, shrinkage reducing agents, pigments, fibers other than the above, water repellents, and whitening prevention. Agents, quick-setting agents (materials), hard-setting agents (materials), setting retarders, foaming agents, slag limes, silica fumes, volcanic ash, slag powders such as blast furnace slag powder, air entraining agents, admixtures such as surface hardening agents, Coarse aggregates such as river gravel, land gravel, and crushed stone can be mentioned.
本発明の鉄筋コンクリートの補修方法は、鉄筋コンクリートの劣化部分のコンクリートを当該部分に埋設されている鉄筋が露出するように除去する工程（Ａ）と、前記工程（Ａ）により露出した鉄筋に発生している錆を除去する工程（Ｂ）と、工程（Ａ）で形成された断面欠損部を上記のポリマーセメントモルタルで埋め戻す工程（Ｃ）とを具備することを特徴とする。工程（Ｂ）は、工程（Ａ）と同時に行っても、工程（Ａ）の後に行ってもよい。また、工程（Ｃ）は、工程（Ａ）及び工程（Ｂ）の後に行う。 The method for repairing reinforced concrete of the present invention is a step (A) of removing the concrete of a deteriorated portion of the reinforced concrete so that the reinforcing bar embedded in the portion is exposed, and a step (A) of occurring in the reinforcing bar exposed by the step (A). It is characterized by including a step (B) of removing the rust and a step (C) of backfilling the cross-sectional defect formed in the step (A) with the above-mentioned polymer cement mortar. The step (B) may be performed at the same time as the step (A) or after the step (A). Further, the step (C) is performed after the step (A) and the step (B).
工程（Ａ）において、コンクリートを除去する方法は、劣化したコンクリートを鉄筋が露出する深さまで除去できれば特に限定されず、例えば、斫り取る方法、超高圧水（ウォータジェット）による方法、静的破砕剤により部分的に破砕する方法、切削機械で削り取る方法、ハンマードリルやクローラドリル等で穿孔する方法、ブラスト処理による方法或いはこれらを組み合わせた方法が好ましい例として挙げられる。この工程（Ａ）において、劣化しているコンクリートを全て除去するときは、健全なコンクリート及び健全な鉄筋が露出するまでコンクリートを除去することが好ましい。 In the step (A), the method for removing the concrete is not particularly limited as long as the deteriorated concrete can be removed to a depth where the reinforcing bar is exposed, for example, a method of scraping, a method of using ultra-high pressure water (water jet), and static crushing. Preferred examples include a method of partially crushing with an agent, a method of scraping with a cutting machine, a method of drilling with a hammer drill, a crawler drill, or the like, a method of blasting, or a method combining these. When removing all the deteriorated concrete in this step (A), it is preferable to remove the concrete until the sound concrete and the sound reinforcing bar are exposed.
工程（Ｂ）は、前記工程（Ａ）により露出した鉄筋に発生している錆を除去する工程であるが、鉄筋に発生している錆を除去する方法は、特に限定されず、超高圧水（ウォータジェット）による方法、ブラスト処理による方法、ワイヤブラシによる方法、サンドペーパーによる方法、ヤスリによる方法、錆が発生している範囲を含む鉄筋を切断・除去する方法及びこれらを組み合わせた方法が好適な例として挙げられる。 The step (B) is a step of removing the rust generated on the reinforcing bar exposed by the step (A), but the method for removing the rust generated on the reinforcing bar is not particularly limited, and ultra-high pressure water is used. (Water jet) method, blasting method, wire brush method, sandpaper method, file method, cutting / removing rebar including rusted area, and a combination of these methods are preferable. An example is given.
工程（Ｂ）で鉄筋に発生している錆を除去した後に、もしも鉄筋の強度が不足する場合、又は鉄筋を切断・除去した場合は、鉄筋を新たなものに交換するか、新たな鉄筋を増設することが好ましい。 After removing the rust generated on the reinforcing bar in step (B), if the strength of the reinforcing bar is insufficient, or if the reinforcing bar is cut or removed, replace the reinforcing bar with a new one or replace the new reinforcing bar. It is preferable to add more.
工程（Ｃ）は、工程（Ａ）で形成された断面欠損部を上記のポリマーセメントモルタルで断面修復する工程である。この工程（Ｃ）は、断面欠損部が上側に開口している窪みで且つ窪みの底又は側面に穴や開口が無い場合、或いは、充填するポリマーセメントモルタルのコンシステンシーが小さく、充填するポリマーセメントモルタルが漏れ出る又は垂れる虞がない場合は、断面欠損部である当該窪みにポリマーセメントモルタルをそのまま充填してもよいが、それ以外の場合は、充填するポリマーセメントモルタルが漏れ出ないように又は垂れないように型枠等で処置した上で、断面欠損部にポリマーセメントモルタルを充填することで断面修復することが好ましい。このとき、必要により空気抜き用のホースを設置してもよい。また、工程（Ｃ）で断面欠損部にポリマーセメントモルタルを充填する方法は、特に限定されずに、鏝、刷毛、ローラー等で塗布する方法、吹付け装置により吹付ける方法、注入工法により注入する方法、又はこれらを組み合わせた方法によることが好ましい。また、ポリマーセメントモルタルを充填す前に、断面欠損部分のコンクリート表面に、水、吸水調整剤、接着増強材から選ばれる１種又は２種以上を塗布してもよい。 The step (C) is a step of repairing the cross-section defect formed in the step (A) with the above-mentioned polymer cement mortar. In this step (C), when the cross-sectional defect is a depression with an opening on the upper side and there is no hole or opening on the bottom or side surface of the depression, or the consistency of the polymer cement mortar to be filled is small, the polymer cement to be filled If there is no risk of the mortar leaking or dripping, the polymer cement mortar may be filled as it is in the recess that is the cross-sectional defect, but in other cases, the polymer cement mortar to be filled may not leak out or It is preferable to repair the cross section by filling the cross section defect with polymer cement mortar after treating with a mold or the like so as not to drip. At this time, a hose for venting air may be installed if necessary. Further, the method of filling the cross-sectional defect portion with the polymer cement mortar in the step (C) is not particularly limited, and the method of applying with a trowel, a brush, a roller or the like, a method of spraying with a spraying device, or a method of injecting with an injection method It is preferable to use a method or a method in which these are combined. Further, before filling the polymer cement mortar, one or more selected from water, a water absorption modifier, and an adhesion enhancer may be applied to the concrete surface of the cross-section defect portion.
以下に示す材料を使用し、表１に示す配合割合となるように粉末又は粒状の固形材料をミキサで１分間乾式混合することでモルタル組成物（プレミックスモルタル）を作製した。作製したモルタル組成物に表１に示す割合の水及び液状混和材料を加え、３分間ミキサで混練することでポリマーセメントモルタル（混練物）を作製した。
＜使用材料＞
（Ａ）亜硝酸塩：
Ａ１： 亜硝酸カルシウム
Ａ２： 亜硝酸リチウム
（Ｂ）セメント： 普通ポルトランドセメント
（Ｃ）ポリマーディスパージョン：
Ｃ１：スチレン・ブタジエン共重合体系（ＳＢＲ系）合成ゴムエマルション（固形分：２０質量％）
Ｃ２：オールアクリル共重合体からなる再乳化型粉末樹脂
（Ｄ）膨張材： 生石灰系膨張材
（Ｅ）フライアッシュ： ＪＩＳフライアッシュ（フライアッシュII種）
（Ｆ）遅延剤：
Ｆ１： クエン酸
Ｆ２： 可溶性デンプン
（Ｇ）消泡剤： ポリエーテル系消泡剤
（Ｈ）有機繊維： ビニロン繊維（繊維長５mm）
（Ｉ）細骨材： 珪砂（Ｆ．Ｍ．：２．６）
A mortar composition (premix mortar) was prepared by using the materials shown below and dry-mixing the powdered or granular solid materials with a mixer for 1 minute so as to have the blending ratios shown in Table 1. A polymer cement mortar (kneaded product) was prepared by adding water and a liquid admixture in the proportions shown in Table 1 to the prepared mortar composition and kneading with a mixer for 3 minutes.
<Material used>
(A) Nitrite:
A1: Calcium nitrite A2: Lithium nitrite (B) cement: Ordinary Portland cement (C) Polymer dispersion:
C1: Styrene-butadiene copolymer system (SBR system) Synthetic rubber emulsion (solid content: 20% by mass)
C2: Re-emulsified powder resin made of all-acrylic copolymer (D) Expansion material: Quicklime-based expansion material (E) Fly ash: JIS fly ash (Fly ash type II)
(F) Delay agent:
F1: Citric acid F2: Soluble starch (G) Defoamer: Polyether defoamer (H) Organic fiber: Vinylon fiber (fiber length 5 mm)
(I) Fine aggregate: Silica sand (FM: 2.6)
作製したポリマーセメントモルタルの品質試験として、以下に示す通り、施工性試験、耐アルカリ性試験、付着強さ試験及び防せい性試験を行った。これらの結果及び評価を表２に示した。 As the quality test of the produced polymer cement mortar, a workability test, an alkali resistance test, an adhesion strength test and a rust resistance test were carried out as shown below. These results and evaluations are shown in Table 2.
＜品質試験方法＞
・施工性試験
混練後２０分間静置し再度３０秒撹拌後に、左官工法に使用できるか否かで可使時間を確認し、垂直面への塗り付け厚さにて塗布可能性を確認するという方法により、塗布可能性及び可使時間を測定した。２０分後の塗り付けにおいて１０mm以上垂れずに塗り付ることができた場合を施工性良好（記号：○）、それ以外の場合を施工性不十分（記号：×）と評価した。
・耐アルカリ性試験
日本建築学会の「鉄筋コンクリート補修用防せい材の品質基準（案）」に規定される耐アルカリ性試験に従って試験を行った。試験の結果、「アルカリに浸しても異常が認められない」との評価の場合を「良好」（記号：○）、それ以外の場合を「不十分」（記号：×）と評価した。
・付着強さ試験
日本建築学会の「鉄筋コンクリート補修用防せい材の品質基準（案）」に規定される鉄筋に対する付着強さ試験方法に従って試験を行った。試験の結果、付着強さが７．８Ｎ／mm２以上の場合を「良好」（記号：○）、それ以外の場合を「不十分」（記号：×）と評価した。
・防せい性試験
日本建築学会の「鉄筋コンクリート補修用防せい材の品質基準（案）」に規定される鉄筋に対する防せい性試験方法に準じて,露出した鉄筋の周囲を別途の防せい材を用いずに上記の作製したポリマーセメントモルタルで充填して供試体を作製し試験を行った。又、比較例の１水準として、試験Ｎｏ．６では、亜硝酸塩を含有しない配合Ｎｏ．５のポリマーセメントモルタルで充填する前に、亜硝酸塩を含有し防せい性能を有するセメントペースト（鉄筋防錆材）を塗布した供試体を作製し同様に試験を行った。試験の結果、ポリマーセメントモルタルで充填した部分（「処理部」という。）の防せい率が５０％以上且つ基材モルタル部分（「未処理部」という。）の防せい率が−１０％以上の場合を防せい性能「良好（有）」（記号：○）、それ以外の場合を「不十分」（記号：×）と評価した。また、合わせて、鉄筋が露出した供試体の断面修復の工程数を表２に記載した。
<Quality test method>
・ Workability test After kneading, let stand for 20 minutes and stir again for 30 seconds, then check the pot life depending on whether it can be used for plastering, and check the applicability by the thickness applied to the vertical surface. The applicability and pot life were measured by the method. It was evaluated that the workability was good (symbol: ◯) when the coating could be applied without dripping by 10 mm or more in the coating after 20 minutes, and the workability was insufficient (symbol: ×) in other cases.
-Alkali resistance test The test was conducted in accordance with the alkali resistance test stipulated in the "Quality Standards (Draft) for Repairing Reinforced Concrete" of the Architectural Institute of Japan. As a result of the test, the case of "no abnormality was observed even when immersed in alkali" was evaluated as "good" (symbol: ○), and the case of other cases was evaluated as "insufficient" (symbol: ×).
-Adhesion strength test The test was conducted according to the adhesion strength test method for reinforcing bars specified in the "Quality Standards (Draft) for Reinforced Concrete Repair Shielding Materials" of the Architectural Institute of Japan. As a result of the test, when the adhesion strength was 7.8 N / mm 2 or more, it was evaluated as "good" (symbol: ◯), and in other cases, it was evaluated as "insufficient" (symbol: x).
-Solidness test According to the resistance test method for reinforcing bars specified in "Quality Standards (Draft) for Repairing Reinforced Concrete" of the Architectural Institute of Japan, a separate protective material is applied around the exposed reinforcing bars. A specimen was prepared and tested by filling with the polymer cement mortar prepared above without using it. In addition, as one level of the comparative example, the test No. In No. 6, formulation No. 6 containing no nitrite. Before filling with the polymer cement mortar of No. 5, a specimen to which a cement paste (reinforcing bar rust preventive material) containing nitrite and having anticorrosive performance was applied was prepared and tested in the same manner. As a result of the test, the protection rate of the portion filled with the polymer cement mortar (referred to as "treated portion") is 50% or more, and the protection rate of the base material mortar portion (referred to as "untreated portion") is -10% or more. The performance was evaluated as "good (yes)" (symbol: ○), and the other cases were evaluated as "insufficient" (symbol: ×). In addition, Table 2 shows the number of steps for cross-sectional repair of the specimen with exposed reinforcing bars.
本発明の実施例に当たる配合Ｎｏ．１〜３のポリマーセメントモルタルは、耐アルカリ性試験においいて、「アルカリに浸しても異常が認められない」との評価、鉄筋に対する付着強さ試験において付着強さが７．８Ｎ／mm２以上且つ防せい性試験において処理部の防せい率が５０％以上で未処理部の防せい率が−１０％以上であるから、日本建築学会の「鉄筋コンクリート補修用防せい材の品質基準（案）」に規定される「鉄筋腐食補修工法に用いる鉄筋コンクリート補修用防せい材」としての品質を満たしており、防せい性試験において断面修復材として用いることができ、断面修復材として鉄筋が露出した断面欠損部を断面修復する（埋める）だけで、鉄筋の防錆処理もでき、工程を少なくできることが分かった。 Formulation No. corresponding to the examples of the present invention. The polymer cement mortars 1 to 3 are evaluated as "no abnormality is observed even when immersed in alkali" in the alkali resistance test, and the adhesion strength to the reinforcing bar is 7.8 N / mm 2 or more in the adhesion strength test. In the anti-corrosion test, the anti-corrosion rate of the treated part is 50% or more and the anti-corrosion rate of the untreated part is -10% or more. Therefore, "Quality Standard (Draft) of Corrosion-proof Material for Reinforced Concrete Repair" Satisfies the quality as "Reinforced concrete repair rust preventive material used in the reinforced concrete corrosion repair method" specified in, and can be used as a cross-section repair material in the rust prevention test, and the rebar is exposed as a cross-section repair material. It was found that the rust prevention treatment of the reinforcing bar can be performed and the number of steps can be reduced simply by repairing (filling) the cross section of the part.
本発明は、劣化した鉄筋コンクリート造の構造物の補修工事に好適に用いることができる。 INDUSTRIAL APPLICABILITY The present invention can be suitably used for repair work of a deteriorated reinforced concrete structure.
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| KR102365874B1 (en) * | 2021-06-16 | 2022-02-24 | 주식회사 제이엠이앤씨 | Anti-corrosion and lightweight polymer mortar components for repair of deteriorated concrete structures |
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| JP7383525B2 (en) | 2020-02-28 | 2023-11-20 | 太平洋マテリアル株式会社 | quick hardening concrete |
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