JP5242188B2 - Plastering mortar with low electrical resistance, a hardened body using the same, and a method for preventing corrosion of steel in a concrete structure using the mortar - Google Patents
Plastering mortar with low electrical resistance, a hardened body using the same, and a method for preventing corrosion of steel in a concrete structure using the mortar Download PDFInfo
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- JP5242188B2 JP5242188B2 JP2008034184A JP2008034184A JP5242188B2 JP 5242188 B2 JP5242188 B2 JP 5242188B2 JP 2008034184 A JP2008034184 A JP 2008034184A JP 2008034184 A JP2008034184 A JP 2008034184A JP 5242188 B2 JP5242188 B2 JP 5242188B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 30
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- 239000004567 concrete Substances 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 24
- 238000005260 corrosion Methods 0.000 title description 14
- 230000007797 corrosion Effects 0.000 title description 13
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- 238000000576 coating method Methods 0.000 claims description 28
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- 125000003504 2-oxazolinyl group Chemical group O1C(=NCC1)* 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
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- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 description 1
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
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- VNSBYDPZHCQWNB-UHFFFAOYSA-N calcium;aluminum;dioxido(oxo)silane;sodium;hydrate Chemical compound O.[Na].[Al].[Ca+2].[O-][Si]([O-])=O VNSBYDPZHCQWNB-UHFFFAOYSA-N 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Building Environments (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
本発明は、塩害等により鋼材腐食を受けたコンクリート構造物の電気防食に用いる左官用モルタル、それを用いた硬化体、及びそれを用いたコンクリート構造物内部にある鋼材の防食方法に関する。 The present invention relates to a plastering mortar used for electrocorrosion protection of a concrete structure subjected to steel corrosion due to salt damage or the like, a cured body using the mortar, and a corrosion prevention method for a steel material inside the concrete structure using the mortar.
コンクリート構造物内部にある鉄筋等の鋼材は、ある塩分濃度以上の状態に晒されると、腐食電池が発生し、陽極となる鋼材に電気腐食が発生する。
このような、腐食電池の発生により誘発される鋼材の腐食を防止する手段として、コンクリート構造物に陽極を設置し、該陽極からコンクリート中の鋼材に直流電流を流し続けることにより、コンクリート中の鋼材の電位を制御し、鋼材の腐食反応を電気化学的に抑制する電気防食工法が推奨されており、コンクリート構造物の補修工法の一つとして利用されている。
When a steel material such as a reinforcing bar in a concrete structure is exposed to a state of a certain salt concentration or more, a corrosion battery is generated, and an electric corrosion is generated in the steel material serving as an anode.
As a means for preventing such corrosion of steel caused by the generation of corrosion batteries, an anode is installed in a concrete structure, and a direct current is allowed to flow from the anode to the steel in the concrete, thereby making the steel in the concrete. An anti-corrosion method that controls the electric potential of the steel and electrochemically suppresses the corrosion reaction of the steel material is recommended, and is used as one of the repair methods for concrete structures.
例えば、表面近傍のコンクリート中に陽極を設置し、この陽極からコンクリート中の鋼材（陰極）に向かって継続的に電流を流す防食工法がある。そして、この電流が適切に流れている限り、鋼材の腐食による劣化の進行が抑制できるものである。 For example, there is a corrosion prevention method in which an anode is installed in concrete near the surface, and current is continuously passed from the anode toward a steel material (cathode) in the concrete. As long as this current flows appropriately, the progress of deterioration due to corrosion of the steel material can be suppressed.
しかしながら、この方法では、時間の経過とともに、防食に必要な防食電流が減少し、長期にわたり陽極と鋼材との間に有効な電位差を維持することが困難であった。
この防食工法に用いられる陽極材としては、チタン系やカーボン系のロッドやリボンなどが多く用いられているが、この陽極の抵抗率を低減するためや不活性化を防止するために、当該陽極の性能を保護するための保護材料で陽極周辺を充填・被覆する必要があり、しかも、既設コンクリートと一体化する必要がある。
この保護材料としてモルタルが用いられる。
However, with this method, as the time elapses, the anticorrosion current necessary for anticorrosion decreases, and it has been difficult to maintain an effective potential difference between the anode and the steel material over a long period of time.
As the anode material used in this anticorrosion method, titanium-based or carbon-based rods or ribbons are often used. In order to reduce the resistivity of the anode or to prevent inactivation, the anode material is used. It is necessary to fill and cover the periphery of the anode with a protective material for protecting the performance of the material, and to integrate with the existing concrete.
Mortar is used as this protective material.
そして、鋼材の防食効果を上げるには、陽極の周囲に充填されたモルタルの硬化体の電気抵抗を小さくし、電流を流れやすくする必要がある。
また、このモルタル硬化体にひび割れが生じると電流が流れにくくなるため、ひび割れの要因である収縮を小さくする必要がある。
And in order to raise the corrosion-proof effect of steel materials, it is necessary to make small the electrical resistance of the hardening body of the mortar with which the circumference | surroundings of the anode were filled, and to make an electric current flow easily.
In addition, when cracks occur in the cured mortar, it is difficult for current to flow, so it is necessary to reduce the shrinkage that is the cause of the cracks.
モルタル硬化体の電気抵抗を小さくするには、水結合材比や単位水量を大きくして、モルタル硬化体中の自由水の量を多くすることが好ましい。
しかしながら、水結合材比や単位水量を大きくすると、モルタルの流動性が大きくなってダレが生じるため、そのままでは使用できない場合がある。また、水結合材比や単位水量を大きくすると、乾燥収縮が大きくなるので、電気抵抗を小さくすることと、収縮を小さくすることとを両立させるのは難しいことであった。
In order to reduce the electrical resistance of the mortar cured body, it is preferable to increase the amount of free water in the mortar cured body by increasing the water binder ratio and unit water amount.
However, when the water binder ratio and the unit water amount are increased, the flowability of the mortar increases and sagging occurs, so that it may not be used as it is. Further, when the water binder ratio and the unit water amount are increased, the drying shrinkage increases, so it is difficult to achieve both reduction in electrical resistance and reduction in shrinkage.
モルタル硬化体の電気抵抗を小さくする方法としては、亜硝酸リチウムや粘土鉱物を含むモルタルを使用する方法が提案されている（特許文献１、特許文献２参照）。
しかしながら、乾燥によりモルタル硬化体の表面から水分が逸散し、長期的には電気抵抗が大きくなるという課題があった。
As a method for reducing the electric resistance of the mortar cured body, a method using mortar containing lithium nitrite or clay mineral has been proposed (see Patent Document 1 and Patent Document 2).
However, there is a problem that moisture is dissipated from the surface of the cured mortar body due to drying, and electrical resistance increases in the long term.
一方、モルタル硬化体の収縮を低減する方法としては、膨張材、収縮低減剤、及び繊維等を併用し、さらに、使用する膨張材として、組成や粒度の異なる二種類の膨張材を組み合わせて使用することが提案されている（特許文献３、特許文献４参照）。 On the other hand, as a method for reducing the shrinkage of the cured mortar, an expansion material, a shrinkage reducing agent, and fibers are used in combination, and as the expansion material to be used, two types of expansion materials having different compositions and particle sizes are used in combination. Has been proposed (see Patent Document 3 and Patent Document 4).
また、有機−無機複合型塗膜養生剤をモルタルやコンクリートの硬化体の表面に塗布することにより、乾燥による水分の逸散を低減して乾燥収縮を抑制することに加え、中性化や外部からの塩分の浸透を抑制することが提案されている（特許文献５参照）。
しかしながら、有機−無機複合型塗膜養生剤をモルタルやコンクリートの硬化体の表面に塗布することが電気抵抗に関して、どのような効果が発揮されるかについては知られていなかった。
Also, by applying organic-inorganic composite coating curing agent to the surface of mortar and concrete hardened bodies, in addition to reducing moisture dissipation due to drying and suppressing drying shrinkage, neutralization and external It has been proposed to suppress the permeation of salt from (see Patent Document 5).
However, it has not been known what effect the application of the organic-inorganic composite type film curing agent to the surface of a mortar or concrete hardened body with respect to electrical resistance.
また、電気防食では、陽極から酸素が発生し、陽極の電位が塩素発生電位まで上昇すると、電気泳動で陽極側に移動した塩化物イオンが、次亜塩素酸や塩素ガスとなり、陽極近傍のモルタルを劣化させることがあるため、モルタル硬化体中でこれら次亜塩素酸や塩素ガスを透過しやすいようにすることも必要である。 In the case of cathodic protection, when oxygen is generated from the anode and the potential of the anode rises to the chlorine generation potential, chloride ions that have moved to the anode side by electrophoresis become hypochlorous acid or chlorine gas, and mortar near the anode. It is also necessary to make these hypochlorous acid and chlorine gas permeate easily in the mortar cured body.
本発明は、水結合材比を高くしてもダレが生じず、電気抵抗が小さく、収縮が小さい左官用モルタルを提供する。また、収縮をさらに低減し、長期的に電気抵抗を小さく保ち、塩素ガスなどの透過を妨げないモルタル硬化体を用いた、コンクリート構造物内部にある鋼材の防食方法を提供する。 The present invention provides a plastering mortar that does not sag even when the water binder ratio is increased, has low electrical resistance, and has low shrinkage. Moreover, the corrosion prevention method of the steel materials inside a concrete structure using the mortar hardening body which reduces shrinkage further, keeps electrical resistance small for a long term, and does not prevent permeation | transmission of chlorine gas etc. is provided.
本発明は、セメントを含有する結合材、細骨材、減水剤、及び水、並びに、膨張材、収縮低減剤、及び繊維を配合したモルタル組成物を使用してなり、膨張材がセメント100部に対して２〜20部、収縮低減剤がセメント100部に対して１〜６部、繊維が結合材、細骨材、及び減水剤を含有してなるモルタル組成物100容量部中、0.01〜1.0容量部である、水結合材比が35〜55％、単位水量が250〜400kg/m3のモルタル配合を用いて調製した、０打モルタルフロー値が200〜320mmのモルタルに、水溶性アクリル系高分子を添加して練混ぜて得られ、ポリアクリル酸ナトリウム、ポリアクリルアミド、及びポリアクリルアミド部分加水分解物のいずれかである水溶性アクリル系高分子を添加して練混ぜて得られ、水溶性アクリル系高分子がセメント100部に対して、0.2〜３部であり、その硬化体の電気抵抗率が100kΩ・cm以下で、収縮量が長さ変化率で-800×10-6以下である左官用モルタルであり、該左官用モルタルを硬化してなる左官用モルタル硬化体であり、該左官用モルタル硬化体の表面に、有機−無機複合型塗膜養生剤を塗布してなるモルタル硬化体であり、有機−無機複合型塗膜剤が、合成樹脂水性分散体、水溶性樹脂、及び膨潤性粘土鉱物を含有してなる該モルタル硬化体であり、有機−無機複合型塗膜剤の膨潤性粘土鉱物が、合成フッ素雲母である該モルタル硬化体であり、有機−無機複合型塗膜剤の使用量が、100〜500g/m2である該モルタル硬化体であり、該左官用モルタル硬化体を用いた、コンクリート構造物内部にある鋼材の防食方法であり、該モルタル硬化体を用いた、コンクリート構造物内部にある鋼材の防食方法である。 The present invention uses a cement-containing binder, fine aggregate, water reducing agent and water , and a mortar composition containing an expanding material, a shrinkage reducing agent, and a fiber, and the expanding material is 100 parts of cement. 2 to 20 parts relative to 100 parts by weight of the shrinkage reducing agent relative to 100 parts of cement, 0.01 to 100 parts by volume of the mortar composition in which the fiber contains a binder, fine aggregate, and a water reducing agent. 1.0 volume part, water binder ratio 35-55%, unit water amount 250-400kg / m 3 mortar prepared with mortar with 0-stroke mortar flow value 200-320mm, water-soluble acrylic It is obtained by adding and kneading a polymer, and is obtained by adding and kneading a water-soluble acrylic polymer that is one of sodium polyacrylate, polyacrylamide, and polyacrylamide partial hydrolyzate. 0.2% of acrylic acrylic polymer to 100 parts of cement Is 3, the following electrical resistivity 100 k.OMEGA · cm of the cured product, the amount of shrinkage is plastering mortar is -800 × 10 -6 or less in length variation rate, and curing the mortar left officer This is a mortar cured product for plastering, and is a mortar cured product obtained by applying an organic-inorganic composite coating curing agent to the surface of the plastering mortar cured product. The mortar cured product comprising a resin aqueous dispersion, a water-soluble resin, and a swellable clay mineral, wherein the swellable clay mineral of the organic-inorganic composite coating agent is a synthetic fluorine mica The amount of the organic-inorganic composite coating agent used is 100 to 500 g / m 2 of the mortar cured body, and the plastering mortar cured body is used to prevent corrosion of steel inside the concrete structure. In a concrete structure using the cured mortar It is a corrosion prevention method of steel in the.
本発明は、水結合材比を高くしてもダレがなく、電気抵抗が小さく、収縮が小さい左官用モルタルを提供する。また、収縮をさらに低減し、長期的に電気抵抗を小さく保ち、塩素ガスなどの透過を妨げない、左官用モルタルの防食方法を提供する。
これらを電気防食に用いることにより、コンクリート構造物中の鋼材の防食において、高い防食効果が得られる。
The present invention provides a plastering mortar that does not sag even when the water binder ratio is increased, has low electrical resistance, and has low shrinkage. Further, the present invention provides a plastering mortar anticorrosion method that further reduces shrinkage, keeps electric resistance small for a long period of time, and does not interfere with permeation of chlorine gas or the like.
By using these for electrocorrosion protection, a high anticorrosion effect is obtained in the anticorrosion of the steel material in the concrete structure.
以下、本発明を詳細に説明する。
なお、本発明における部や％は特に規定しない限り、質量基準で示す。
Hereinafter, the present invention will be described in detail.
In the present invention, “part” and “%” are based on mass unless otherwise specified.
本発明では、セメントを含有する結合材、細骨材、及び減水剤等を用い、水結合材比が35〜55％、単位水量が250〜400kg/m3、０打モルタルフロー値が200〜320mmの流動性の高いモルタルと、水溶性アクリル系高分子とを練混ぜ、その硬化体の電気抵抗率が100kΩ・cm以下で、収縮量が長さ変化率が-800×10-6以下である左官用モルタルを調製する。 In the present invention, a cement-containing binder, fine aggregate, water reducing agent and the like are used, the water binder ratio is 35 to 55%, the unit water amount is 250 to 400 kg / m 3 , and the zero-stroke mortar flow value is 200 to A mortar with a high fluidity of 320 mm and a water-soluble acrylic polymer are mixed together, and the cured product has an electrical resistivity of 100 kΩ · cm or less and a shrinkage of less than -800 × 10 -6 . A plastering mortar is prepared.
本発明では、セメントを含有する結合材を使用する。
結合材とは、セメント、又はセメントと、必要に応じ併用するシリカフューム、高炉水砕スラグ、フライアッシュ、膨張材、急硬材、及び高強度混和材等の各種混和材との配合物をいう。
In the present invention, a binder containing cement is used.
The binder refers to cement or a combination of cement and various admixtures such as silica fume, blast furnace granulated slag, fly ash, expansion material, rapid hardening material, and high-strength admixture used in combination as necessary.
本発明で使用するセメントとしては、普通、早強、超早強、低熱、及び中庸熱等の各種ポルトランドセメント、これらポルトランドセメントに、高炉スラグ、フライアッシュ、又はシリカを混合した各種混合セメント、また、石灰石粉末や高炉徐冷スラグ微粉末を混合したフィラーセメント、並びに、各種の産業廃棄物を主原料として製造された環境調和型セメント、いわゆるエコセメントなどが挙げられ、これらのうちの一種又は二種以上が使用可能である。 As the cement used in the present invention, various portland cements such as normal, early strength, very early strength, low heat, and moderate heat, various mixed cements obtained by mixing blast furnace slag, fly ash, or silica with these portland cements, and , Limestone powder and blast furnace slow-cooled slag fine powder, and environmentally friendly cement made from various industrial wastes as main raw materials, so-called eco-cement. More than species can be used.
本発明で使用する細骨材は特に限定されるものではない。その具体例としては、例えば、ケイ砂、石灰砂、高炉水砕スラグ細骨材、再生細骨材、及び重量細骨材等が挙げられる。
また、高炉徐冷スラグ細骨材、電気炉酸化期スラグ系細骨材、並びに、フェロニッケルスラグ、フェロクロムスラグ、銅スラグ、亜鉛スラグ、及び鉛スラグなどを総称する非鉄精錬スラグ細骨材等が、橄欖岩（かんらん岩）系細骨材、いわゆるオリビンサンド、及びエメリー鉱等が挙げられる。本発明では、これらのうちの一種又は二種以上が使用可能である。
細骨材の使用量は特に限定されるものではなく、用途や要求される作業性に応じて適宜調整される。
The fine aggregate used in the present invention is not particularly limited. Specific examples thereof include silica sand, lime sand, blast furnace granulated slag fine aggregate, recycled fine aggregate, and heavy fine aggregate.
In addition, blast furnace slow-cooled slag fine aggregate, electric furnace oxidation stage slag fine aggregate, and non-ferrous smelted slag fine aggregate that collectively refers to ferronickel slag, ferrochrome slag, copper slag, zinc slag, lead slag, etc. , Peridotite fine aggregates, so-called olivine sand, emery ore and the like. In the present invention, one or more of these can be used.
The amount of fine aggregate used is not particularly limited, and is appropriately adjusted according to the application and required workability.
本発明で使用する減水剤は特に限定されるものではない。その具体例としては、例えば、ナフタレン系減水剤としては、エヌエムビー社製、商品名「レオビルドSP-9」シリーズ、花王社製、商品名「マイティ2000」シリーズ、及び日本製紙社製、商品名「サンフローHS-100」などが挙げられる。また、メラミン系減水剤としては、日本シーカ社製、商品名「シーカメント1000」シリーズや日本製紙社製、商品名「サンフローHS-40」などが挙げられる。さらに、アミノスルホン酸系減水剤としては、フローリック社製、商品名「FP-200」シリーズなどが挙げられる。ポリカルボン酸系減水剤としては、エヌエムビー社製、商品名「レオビルドSP-8」シリーズ、グレースケミカルズ社製、商品名「ダーレックススーパー100PHX」、及び竹本油脂社製、商品名「チューポールHP-8」シリーズや「チューポールHP-11」シリーズなどが挙げられる。本発明ではこれら減水剤のうちの一種又は二種以上が使用可能である。
減水剤の使用量は特に限定されるものではなく、用途や要求される作業性に応じて適宜調整される。
The water reducing agent used in the present invention is not particularly limited. Specific examples thereof include, for example, naphthalene-based water reducing agents, manufactured by NMB, trade name "Leo Build SP-9" series, Kao Corporation, trade name "Mighty 2000" series, and Nippon Paper Industries, trade name " Sunflow HS-100 ". Examples of the melamine water reducing agent include Nippon Seika Co., Ltd., trade name “Sea Cament 1000” series, Nippon Paper Industries Co., Ltd., trade name “Sunflow HS-40”, and the like. Furthermore, examples of the aminosulfonic acid water reducing agent include a product name “FP-200” series manufactured by Floric. Polycarboxylic acid-based water reducing agents are manufactured by NMB, trade name "Leo Build SP-8" series, Grace Chemicals, trade name "Darlex Super 100PHX", and Takemoto Yushi Co., Ltd., trade name "Tupol HP- 8 "series and" Tupole HP-11 "series. In the present invention, one or more of these water reducing agents can be used.
The amount of water reducing agent used is not particularly limited, and is appropriately adjusted according to the application and required workability.
本発明では、セメント、骨材、及び減水剤等とともに、石灰石微粉末、高炉徐冷スラグ微粉末、下水汚泥焼却灰やその溶融スラグ、都市ゴミ焼却灰やその溶融スラグ、パルプスラッジ焼却灰等の混和材料、凝結調整剤、消泡剤、防錆剤、防凍剤、スチールファイバー、ビニロンファイバー、炭素繊維、及びワラストナイト繊維等の繊維物質、ポリマー、ベントナイトなどの粘土鉱物、並びに、ハイドロタルサイトなどのアニオン交換体等のうちの一種又は二種を、本発明の目的を実質的に阻害しない範囲で使用することが可能である。 In the present invention, limestone fine powder, blast furnace slow-cooled slag fine powder, sewage sludge incinerated ash and its molten slag, municipal waste incinerated ash and its molten slag, pulp sludge incinerated ash, etc. Admixtures, setting modifiers, antifoaming agents, rust inhibitors, antifreeze agents, fiber materials such as steel fibers, vinylon fibers, carbon fibers, and wollastonite fibers, clay minerals such as polymers and bentonite, and hydrotalcite It is possible to use 1 type or 2 types of anion exchangers etc., etc. in the range which does not inhibit substantially the objective of this invention.
本発明では、結合材、細骨材、水、及び減水剤を含有するモルタル組成物を用いてモルタルを調製する。
モルタルを調製する際の水結合材比は、35〜55％であり、40〜50％が好ましい。水セメント比が35％未満では、モルタル硬化体中の自由水の量が少なくなるため、電気抵抗が大きくなり、充分な防食効果が得られなくなるおそれがあり、55％を超えると、水溶性アクリル系高分子を添加してもダレが生じ、左官用モルタルとしての作業性を損ねるおそれがある。
In this invention, mortar is prepared using the mortar composition containing a binder, a fine aggregate, water, and a water reducing agent.
The water binder ratio in preparing the mortar is 35 to 55%, preferably 40 to 50%. If the water-cement ratio is less than 35%, the amount of free water in the mortar hardened body will be small, which may increase the electrical resistance and may not provide a sufficient anticorrosive effect. Addition of a polymer may cause sagging and impair workability as a plastering mortar.
ここで、左官モルタルとは、コテ塗りで使うモルタルであり、ダレがなく、粘性が小さいことが求められる。ダレが生じると、壁や天井部分等の施工でモルタルがうまく充填できず、流れてしまい、粘性が大きいと、コテ離れが悪く、作業性が悪くなる。ダレの目安として、JIS R 5201によるモルタルフロー値（15打モルタルフロー値）が120〜180mm程度が好ましい。120mm未満では流動性が小さすぎて、コテでモルタルを塗り付けるときにモルタルが伸びず、作業性が悪くなるおそれがあり、180mmを超えるとダレが生じるようになるおそれがある。 Here, the plastering mortar is a mortar used for trowel coating, and is required to have no sagging and low viscosity. When sag occurs, the mortar cannot be filled well due to the construction of the wall or ceiling part, etc., and flows, and if the viscosity is large, the detachment of the iron is bad and workability is poor. As a measure of sagging, a mortar flow value (15-stroke mortar flow value) according to JIS R 5201 is preferably about 120 to 180 mm. If it is less than 120 mm, the fluidity is too small, and when the mortar is applied with a trowel, the mortar does not stretch and the workability may be deteriorated, and if it exceeds 180 mm, sagging may occur.
また、モルタルを調製する際の単位水量は、250〜400kg/m3であり、289〜337kg/m3が好ましい。250kg/m3未満では、左官モルタル硬化体又はモルタル硬化体（以下、本硬化体という）中の自由水の量が少なくなるため、電気抵抗が大きくなり、充分な防食効果が得られなくなるおそれがあり、400kg/m3を超えると、水溶性アクリル系高分子を添加してもダレが生じ、左官用モルタルとしての作業性を損ねるおそれがある。 The unit amount of water in the preparation of mortar is 250~400kg / m 3, 289~337kg / m 3 is preferred. If it is less than 250 kg / m 3 , the amount of free water in the plastered mortar cured body or mortar cured body (hereinafter referred to as the main cured body) decreases, so that there is a possibility that the electrical resistance increases and sufficient anticorrosion effect cannot be obtained. If it exceeds 400 kg / m 3 , sagging may occur even when a water-soluble acrylic polymer is added, and the workability as a plastering mortar may be impaired.
０打モルタルフロー値とは、JIS R 5201においてフローテーブルをタッピングしない、静置状態でのモルタルフロー値を指すもので、本発明では、200〜320mmであり、235〜275mmが好ましい。200mm未満では、電気抵抗が大きくなり、充分な防食効果が得られなくなるおそれがあり、320mmを超えると、材料分離が生じやすくなるおそれがある。 The zero-strike mortar flow value refers to a mortar flow value in a stationary state without tapping the flow table in JIS R 5201. In the present invention, it is 200 to 320 mm, and preferably 235 to 275 mm. If the thickness is less than 200 mm, the electric resistance increases, and a sufficient anticorrosion effect may not be obtained. If the thickness exceeds 320 mm, material separation may easily occur.
本発明では、セメント、細骨材、水、及び減水剤を含有するモルタル組成物を用い、水結合材比が35〜55％、単位水量が250〜400kg/m3で、０打モルタルフロー値が200〜320mmという流動性の高いモルタルに、水溶性アクリル系高分子を添加して練混ぜることにより、水結合材比が高くてもダレがなく、作業性の良い左官用モルタルを調製する。 In the present invention, a mortar composition containing cement, fine aggregate, water, and a water reducing agent is used, the water binder ratio is 35 to 55%, the unit water amount is 250 to 400 kg / m 3 , and the zero-stroke mortar flow value. By adding a water-soluble acrylic polymer to a highly fluid mortar of 200 to 320 mm and kneading, a plastering mortar with good workability is prepared without dripping even if the water binder ratio is high.
本発明で使用する水溶性アクリル系高分子は、単に流動性の高いモルタルを増粘させて可塑性を付与するだけのものではない。
水溶性アクリル系高分子を、上記流動性の高いモルタルと混合することによって、粘性が小さく、コテ離れが良く、作業性の良い左官用モルタルが得られ、多量の空気を連行せず、強度発現性を阻害するものではない。これに対して、例えば、増粘剤として多く用いられているメチルセルロース系の化合物を使用した場合には、モルタルの粘性が大きくなり、コテ離れが悪く、作業性が悪くなる。また、多量の空気を連行し、強度発現性を阻害する。
水溶性アクリル系高分子としては、ポリアクリル酸ナトリウム、ポリアクリルアミド、及びポリアクリルアミド部分加水分解物等がある。
本発明の水溶性アクリル系高分子を用いると、粘性が小さく、コテ離れが良い左官用モルタルが得られるため、狭い間隙への充填性が良い。この理由は明らかではないが、特に、ナフタレン系の減水剤と併用したときに顕著であり、減水剤と何らかの相互作用をおよぼしていることが考えられる。
The water-soluble acrylic polymer used in the present invention is not limited to simply imparting plasticity by thickening mortar having high fluidity.
By mixing water-soluble acrylic polymer with mortar with high fluidity, mortar for plastering with low viscosity, good iron separation, and good workability can be obtained. It does not inhibit sex. On the other hand, for example, when a methylcellulose-based compound that is frequently used as a thickener is used, the viscosity of the mortar is increased, the iron separation is poor, and the workability is deteriorated. In addition, a large amount of air is entrained to inhibit strength development.
Examples of the water-soluble acrylic polymer include sodium polyacrylate, polyacrylamide, and polyacrylamide partial hydrolyzate.
When the water-soluble acrylic polymer of the present invention is used, a plastering mortar having a low viscosity and good separation of the iron can be obtained, so that the filling ability into a narrow gap is good. The reason for this is not clear, but it is particularly prominent when used in combination with a naphthalene-based water reducing agent, and it is considered that some interaction with the water reducing agent is exerted.
水溶性アクリル系高分子の使用量は、セメント100部に対して、0.2〜３部が好ましく、0.3〜１部がより好ましい。0.2部未満ではダレが生じるおそれがあり、３部を超えて使用しても、左官用モルタルの作業性を確保する効果が頭打ちになる。 The amount of the water-soluble acrylic polymer used is preferably 0.2 to 3 parts, more preferably 0.3 to 1 part, with respect to 100 parts of cement. If it is less than 0.2 parts, sagging may occur, and even if it exceeds 3 parts, the effect of ensuring the workability of the plastering mortar will reach its peak.
本発明において、水溶性アクリル系高分子の使用方法は特に限定されるものではないが、所定の水結合材比と単位水量のモルタルを練混ぜた後に添加して練混ぜることにより、ダレがなく、作業性の良好な左官用モルタルが得られやすいことから好ましい。 In the present invention, the method of using the water-soluble acrylic polymer is not particularly limited, but there is no dripping by adding and kneading the mortar with a predetermined water binder ratio and unit water amount after kneading. It is preferable because it is easy to obtain a plastering mortar with good workability.
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、ハンドミキサ、グラウトミキサ、ダマカットミキサ、二軸ミキサ、オムニミキサ、パン型ミキサ、遊星型ミキサ、及び傾胴ミキサなどが使用可能である。 As the mixing device, any existing device can be used, for example, a hand mixer, a grout mixer, a damacut mixer, a biaxial mixer, an omni mixer, a pan mixer, a planetary mixer, and a tilting mixer can be used. is there.
本硬化体の電気抵抗率は、100kΩ・cm以下であり、収縮量は、長さ変化率で、-800×10-6以下である。 The cured product has an electrical resistivity of 100 kΩ · cm or less, and a shrinkage amount is a rate of change in length of −800 × 10 −6 or less.
本硬化体の電気抵抗率は、100kΩ・cm以下であり、50kΩ・cm以下が好ましい。電気抵抗率が100kΩ・cmを超えると、電流が流れにくくなり、充分な防食効果が得られなくなるおそれがある。 The electric resistivity of the cured product is 100 kΩ · cm or less, preferably 50 kΩ · cm or less. When the electrical resistivity exceeds 100 kΩ · cm, it is difficult for current to flow, and there is a possibility that sufficient anticorrosive effect cannot be obtained.
また、本硬化体の収縮量は、長さ変化率で、-800×10-6以下であり、-600×10-6以下が好ましい。長さ変化率が-800×10-6を超えるとひび割れが発生しやすくなり、電流が流れにくくなって、充分な防食効果が得られなくなるおそれがある。 Further, the shrinkage of the cured product is a rate of change in length of −800 × 10 −6 or less, preferably −600 × 10 −6 or less. If the rate of change in length exceeds −800 × 10 −6 , cracks are likely to occur, current may not flow easily, and a sufficient anticorrosion effect may not be obtained.
本発明では、本硬化体の収縮量を低減するため、即ち、長さ変化率を-800×10-6以下とするために、膨張材、収縮低減剤、及び繊維を併用することは好ましい。 In the present invention, it is preferable to use an expansion material, a shrinkage reducing agent, and a fiber in combination in order to reduce the amount of shrinkage of the cured product, that is, in order to make the length change rate to be −800 × 10 −6 or less.
ここで、膨張材は特に限定されるものではなく、いかなるものでも使用可能である。その種類としては、遊離石灰や遊離マグネシアを含むものが挙げられるが、長期安定性の観点から、遊離石灰を含む膨張材が好ましい。 Here, the expansion material is not particularly limited, and any material can be used. Although the thing containing free lime and free magnesia is mentioned as the kind, From the viewpoint of long-term stability, the expansion | swelling material containing free lime is preferable.
遊離石灰を含む膨張材としては、例えば、遊離石灰−無水セッコウ系膨張材、遊離石灰−水硬性化合物系膨張材、並びに、遊離石灰−水硬性化合物−無水セッコウ系膨張材等が挙げられる。
本発明では、膨張性能が良好なことから、遊離石灰−水硬性化合物−無水セッコウ系膨張材を用いることが好ましい。
Examples of the expanding material containing free lime include a free lime-anhydrous gypsum-based expanding material, a free lime-hydraulic compound-based expanding material, and a free lime-hydraulic compound-anhydrous gypsum-based expanding material.
In this invention, since expansion | swelling performance is favorable, it is preferable to use a free lime-hydraulic compound-anhydrous gypsum-type expansion | swelling material.
ここで、水硬性化合物としては、例えば、アウイン、カルシウムフェライト、カルシウムアルミノフェライト、カルシウムシリケート、及びカルシウムアルミネートなどの一種又は二種以上が挙げられる。
遊離石灰−水硬性化合物−無水セッコウ系膨張材において、水硬性化合物が、アウイン、カルシウムフェライト、及びカルシウムアルミノフェライトなどの一種又は二種以上から構成される膨張材は、遊離石灰から消石灰を生成するとともに、水硬性化合物と無水セッコウからエトリンガイトも生成する。このため、エトリンガイトに因んで、カルシウムサルホアルミネート系膨張材と称されるものや、エトリンガイト−石灰複合系膨張材と称されるものがある。
このような膨張材としては、各社より市販されている膨張材や静的破砕材が利用可能である。 膨張材や静的破砕材は、多数市販されており、その代表例としては、電気化学工業社製、商品名「デンカＣＳＡ」や「デンカパワーＣＳＡ」、住友大阪セメント社製、商品名「サクス」、太平洋マテリアル社製、商品名「エクスパン」、「Ｎ-ＥＸ」、「ブライスター」、及び「太平洋ジプカル」などが挙げられる。
Here, examples of the hydraulic compound include one or more of Auin, calcium ferrite, calcium aluminoferrite, calcium silicate, and calcium aluminate.
In the free lime-hydraulic compound-anhydrous gypsum-based expansive material, the expansive material in which the hydraulic compound is composed of one or more of Auin, calcium ferrite, and calcium aluminoferrite produces slaked lime from the free lime. At the same time, ettringite is also produced from hydraulic compounds and anhydrous gypsum. For this reason, there exist what is called a calcium sulfoaluminate type | system | group expansion | swelling material and what is called an ettringite-lime composite type | system | group expansion | swelling material in connection with ettringite.
As such an expanding material, an expanding material or a static crushing material marketed by each company can be used. A large number of inflatables and static crushed materials are commercially available, and representative examples thereof include those manufactured by Denki Kagaku Kogyo Co., Ltd., trade names “Denka CSA” and “Denka Power CSA”, Sumitomo Osaka Cement Co., Ltd. ", Trade name" Expan "," N-EX "," Breister ", and" Pacific Gypcal "manufactured by Taiheiyo Material.
膨張材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2,500〜10,000cm2/gが好ましくい。
膨張材の使用量は、セメント100部に対して、２〜20部が好ましい。
The particle size of the intumescent material is not particularly limited, but usually it is preferably 2,500 to 10,000 cm 2 / g in terms of the specific surface area of the brain (hereinafter referred to as the brain value).
The amount of the expansion material used is preferably 2 to 20 parts with respect to 100 parts of cement.
収縮低減剤としては、収縮低減成分が一般式RO(AO)nH（Rは炭素数４〜６のアルキル基、Aは炭素数２〜３の一種又は二種のアルキレン基、nは１〜10の整数）で示される低級アルコールのアルキレンオキサイド付加物を主体としたものや、一般式X{O(AO)nR}m（ただし、Xは２〜８個の水酸基を有する化合物の残基、AOは炭素数２〜18のオキシアルキレン基、Rは水素原子、炭素数１〜18の炭化水素基、又は炭素数２〜18のアシル基、nは30〜1,000、mは２〜８）で示され、そのオキシアルキレン基の60mol％以上はオキシエチレン基であるポリオキシアルキレン誘導体等が使用可能である。
収縮低減剤の使用量は、セメント100部に対して、１〜６部が好ましい。
As the shrinkage reducing agent, the shrinkage reducing component is represented by the general formula RO (AO) nH (R is an alkyl group having 4 to 6 carbon atoms, A is one or two alkylene groups having 2 to 3 carbon atoms, and n is 1 to 10). Or an alkylene oxide adduct of a lower alcohol represented by the general formula X {O (AO) nR} m (where X is a residue of a compound having 2 to 8 hydroxyl groups, AO Is an oxyalkylene group having 2 to 18 carbon atoms, R is a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, or an acyl group having 2 to 18 carbon atoms, n is 30 to 1,000, and m is 2 to 8) A polyoxyalkylene derivative in which 60 mol% or more of the oxyalkylene group is an oxyethylene group can be used.
The amount of shrinkage reducing agent used is preferably 1 to 6 parts per 100 parts of cement.
繊維は特に限定されるものではなく、一般に市販されているものが使用でき、具体的には、高強度のビニロン繊維やポリエチレン繊維等が挙げられる。
繊維の使用量は、結合材、細骨材、及び減水剤を含有してなるモルタル組成物100容量部中、0.01〜1.0容量部が好ましい。
The fibers are not particularly limited, and commercially available products can be used, and specific examples include high-strength vinylon fibers and polyethylene fibers.
The amount of fiber used is preferably 0.01 to 1.0 part by volume in 100 parts by volume of a mortar composition containing a binder, fine aggregate, and a water reducing agent.
本発明では、本硬化体の表面に、有機−無機複合型塗膜養生剤を塗布することは、収縮量をさらに低減し、ひび割れを抑制できるばかりでなく、長期的に本硬化体の電気抵抗を小さく保つことができることから好ましい。 In the present invention, applying the organic-inorganic composite type film curing agent to the surface of the cured body not only can further reduce the shrinkage and suppress cracking, but also can provide long-term electrical resistance of the cured body. Is preferable because it can be kept small.
防食工法では、エポキシ樹脂等による塗装もあるが、エポキシ樹脂等を塗装すると、陽極で発生した塩素ガスなどが透過しないため、陽極近傍のモルタルが劣化し、塗膜の変色や剥がれが起こる。一方、本発明の有機−無機複合型塗膜養生剤では、水分の逸散を抑制するが、塩素ガスなどは緩やかに透過するため、モルタルや塗膜が劣化しない。 In the anticorrosion method, there is coating with an epoxy resin or the like. However, when the epoxy resin or the like is coated, chlorine gas generated at the anode does not permeate, so that the mortar near the anode is deteriorated and the coating film is discolored or peeled off. On the other hand, the organic-inorganic composite type coating curing agent of the present invention suppresses the dissipation of moisture, but chlorine gas and the like permeate slowly, so that the mortar and coating film do not deteriorate.
本発明の有機−無機複合型塗膜養生剤とは、合成樹脂水性分散体、水溶性樹脂、及び膨潤性粘土鉱物を、また、さらに、これらと架橋剤とを主成分とするものである。 The organic-inorganic composite type coating curing agent of the present invention is composed of a synthetic resin aqueous dispersion, a water-soluble resin, and a swellable clay mineral, and these and a crosslinking agent as main components.
ここで、合成樹脂水性分散体とは、一般的には合成樹脂エマルジョンであり、芳香族ビニル単量体、脂肪族共役ジエン系単量体、エチレン系不飽和脂肪酸単量体、及びその他の共重合可能な単量体の内から一種又は二種以上を乳化重合して得られるものである。例えば、スチレンを主体としたスチレン・ブタジエン系ラテックス、スチレン・アクリル系エマルジョンやスチレンと共重合したメチルメタクリレート・ブタジエン系ラテックス、エチレン・アクリルエマルジョンである。合成樹脂エマルジョンには、カルボキシル基又はヒドロキシ基を有するものがより望ましい。
ここで、乳化重合は、重合すべき単量体を混合し、これに乳化剤や重合開始剤等を加え水系で行なう一般的な乳化重合方法である。
膨潤性粘土鉱物との配合安定性を得るには、アンモニア、アミン類、及びカセイソーダなどの塩基性物質を使用し、ｐＨ５以上に調整したものが好ましい。
合成樹脂水性分散体の粒子径は、一般的に100〜300nmであるが、60〜100nm程度の小さい粒子径のものが好ましい。
Here, the synthetic resin aqueous dispersion is generally a synthetic resin emulsion, and includes an aromatic vinyl monomer, an aliphatic conjugated diene monomer, an ethylenically unsaturated fatty acid monomer, and other co-polymers. It is obtained by emulsion polymerization of one or two or more of polymerizable monomers. For example, styrene / butadiene latex mainly composed of styrene, styrene / acrylic emulsion, methyl methacrylate / butadiene latex copolymerized with styrene, and ethylene / acrylic emulsion. The synthetic resin emulsion is more preferably one having a carboxyl group or a hydroxy group.
Here, the emulsion polymerization is a general emulsion polymerization method in which a monomer to be polymerized is mixed, and an emulsifier, a polymerization initiator, etc. are added to the monomer and the reaction is carried out in an aqueous system.
In order to obtain blending stability with the swellable clay mineral, it is preferable to use a basic substance such as ammonia, amines, and caustic soda and adjust the pH to 5 or more.
The particle diameter of the synthetic resin aqueous dispersion is generally 100 to 300 nm, but preferably has a small particle diameter of about 60 to 100 nm.
水溶性樹脂としては、加工澱粉又はその誘導体、セルロース誘導体、ポリ酢酸ビニルの鹸化物又はその誘導体、スルホン酸基を有する重合体又はその塩、アクリル酸の重合体や共重合体又はこれらの塩、アクリルアミドの重合体や共重合体、ポリエチレングリコール、及びオキサゾリン基含有重合体等が挙げられ、そのうちの一種又は二種以上の使用が可能である。
水溶性樹脂としては、純水への溶解度が常温で１％以上であるものであれば良く、樹脂単位重量当たりの水素結合性基又はイオン性基が10〜60％であることが好ましい。
また、平均分子量は2,000〜1,000,000が好ましい。
水溶性樹脂の使用量は、合成樹脂水性分散体の固形分100部に対して、固形分換算で0.05〜200部が好ましい。
Examples of water-soluble resins include modified starch or derivatives thereof, cellulose derivatives, saponified polyvinyl acetate or derivatives thereof, polymers having sulfonic acid groups or salts thereof, polymers or copolymers of acrylic acid or salts thereof, Examples include acrylamide polymers and copolymers, polyethylene glycol, and oxazoline group-containing polymers, and one or more of them can be used.
The water-soluble resin may be one having a solubility in pure water of 1% or more at room temperature, and preferably has 10 to 60% of hydrogen bonding groups or ionic groups per unit weight of the resin.
The average molecular weight is preferably 2,000 to 1,000,000.
The amount of the water-soluble resin used is preferably 0.05 to 200 parts in terms of solid content with respect to 100 parts of solid content of the synthetic resin aqueous dispersion.
膨潤性粘土鉱物としては、スクメタイト属に属する層状ケイ酸塩鉱物が挙げられる。例えば、バイデライト、ノントロナイト、サポナイト、マイカ、及びベントナイトなどである。これらは天然品、合成品、及び加工処理品のいずれであっても使用可能である。
そのうち、日本ベントナイト工業会、標準試験方法 JBAS-104-77に準じた方法で測定した膨潤力が20ml/g以上の粘土鉱物、特に、ベントナイトが好ましい。
また、イオン交換当量が100ｇ当たり、10ミリ当量以上ものが好ましい。
さらに、そのアスペクト比が50〜5,000のものが好ましい。アスペクト比とは、電子顕微鏡写真により求めた層状に分散した粘土鉱物の長さ／厚みの比である。
膨潤性粘土鉱物の使用量は、合成樹脂水性分散体の固形分100部に対して、１〜50部が好ましい。
Examples of swellable clay minerals include layered silicate minerals belonging to the scumite genus. For example, beidellite, nontronite, saponite, mica and bentonite. Any of natural products, synthetic products, and processed products can be used.
Among them, clay minerals having a swelling power of 20 ml / g or more as measured by a method according to the Japan Bentonite Industry Association, standard test method JBAS-104-77, particularly bentonite is preferred.
Further, the ion exchange equivalent is preferably 10 milliequivalents or more per 100 g.
Furthermore, those having an aspect ratio of 50 to 5,000 are preferred. The aspect ratio is the length / thickness ratio of the clay mineral dispersed in a layer form determined by an electron micrograph.
The amount of the swellable clay mineral used is preferably 1 to 50 parts with respect to 100 parts of the solid content of the synthetic resin aqueous dispersion.
架橋剤とは、水溶性樹脂や合成樹脂水性分散体が有するカルボキシル基、アミド基、及び水酸基等の親水性官能基と反応して、架橋、高分子化（三次元網目構造）、又は疎水化するものであり、カルボキシル基と付加反応を起こすオキサゾリン基を有するものが水溶性樹脂をも兼ねるので好ましい。
架橋剤の使用量は、合成樹脂水性分散体と水溶性樹脂の合計の固形分100部に対して、固形分換算で0.01〜30部が好ましい。
A cross-linking agent reacts with a hydrophilic functional group such as a carboxyl group, an amide group, and a hydroxyl group contained in an aqueous dispersion of a water-soluble resin or synthetic resin to crosslink, polymerize (three-dimensional network structure), or hydrophobize. Those having an oxazoline group that undergoes an addition reaction with a carboxyl group are also preferable because they also serve as water-soluble resins.
The amount of the crosslinking agent used is preferably 0.01 to 30 parts in terms of solid content with respect to 100 parts of the total solid content of the synthetic resin aqueous dispersion and the water-soluble resin.
本発明では、合成樹脂水性分散体、水溶性樹脂、及び膨潤性粘土鉱物を混合して、また、さらに、これらと架橋剤とを反応させて、有機−無機複合型塗膜養生剤を調製する。 In the present invention, an organic-inorganic composite type coating curing agent is prepared by mixing an aqueous synthetic resin dispersion, a water-soluble resin, and a swellable clay mineral, and further reacting these with a crosslinking agent. .
有機−無機複合型塗膜養生剤の合成方法は、水溶性樹脂と膨潤性粘土鉱物をあらかじめ水中で混合した後に、合成樹脂水性分散体と架橋剤を混合する方法が好ましい。 As a method for synthesizing the organic-inorganic composite-type coating curing agent, a method in which a water-soluble resin and a swellable clay mineral are mixed in water in advance and then a synthetic resin aqueous dispersion and a crosslinking agent are mixed.
有機−無機複合型塗膜養生剤の被覆方法は、均一に養生被覆膜が形成できる方法であれば特に限定されるものではなく、撒布したり、塗布したり、吹付けしたりすることが可能である。
有機−無機複合型塗膜養生剤は、左官用モルタルの凝結が終結した後、表面に塗布することが好ましい。時間が経つと、モルタルの表面が乾燥し、ひび割れが発生しやすくなる。
このような有機−無機複合型塗膜養生剤としては、電気化学工業社の「RISフルコート」や「クラッコフ」、東亞合成社の「CA2」シリーズを用いることができる。
本発明の左官用モルタル硬化体に、本発明の塗膜養生剤を塗布することにより、長さ変化率をさらに低減してひび割れを抑制するばかりでなく、長期的にモルタル硬化体の電気抵抗を小さく保ち、防食効果を高めることができる。
The organic-inorganic composite-type film curing agent coating method is not particularly limited as long as it can form a uniform curing coating film, and can be distributed, applied, or sprayed. Is possible.
The organic-inorganic composite type film curing agent is preferably applied to the surface after the plastering of the plastering mortar is completed. Over time, the surface of the mortar dries and cracks tend to occur.
As such an organic-inorganic composite type film curing agent, “RIS full coat” and “Krakoff” manufactured by Denki Kagaku Kogyo Co., Ltd. and “CA2” series manufactured by Toagosei Co., Ltd. can be used.
By applying the film curing agent of the present invention to the plastering mortar cured body of the present invention, not only can the length change rate be further reduced to suppress cracking, but also the electrical resistance of the mortar cured body over the long term. Keeping it small can increase the anticorrosion effect.
有機−無機複合型塗膜養生剤の使用量は特に限定されるものではないが、１m2当たり、100g〜500ｇが好ましく、150〜400ｇがより好ましい。100ｇ未満では、長期的に電気抵抗を小さく保つ効果が充分でなくなるおそれがあり、500ｇを超えると、塩素ガスなどが透過しにくくなるおそれがある。 Although the usage-amount of an organic-inorganic composite type coating film curing agent is not specifically limited, 100g-500g per m < 2 > are preferable and 150-400g is more preferable. If it is less than 100 g, the effect of keeping the electrical resistance small in the long term may not be sufficient, and if it exceeds 500 g, chlorine gas or the like may be difficult to permeate.
以下に実験例を挙げて本発明を具体的に説明するが、本発明はこれらの実験例に限定されるものではない。 The present invention will be specifically described below with reference to experimental examples, but the present invention is not limited to these experimental examples.
実験例１
セメントと、セメント100部に対し、膨張材Ａ５部、膨張材Ｂ５部、及び収縮低減剤３部の混和材からなる結合材、細骨材、減水剤、及び繊維を配合してモルタル組成物を調製し、モルタル組成物100容量部中、繊維を0.15容量部として、表１に示す、水結合材比と単位水量のモルタル配合を用い、表１に示すモルタルフロー値の左官用モルタルを調製した。
その後、セメント100部に対して、水溶性アクリル系高分子0.5部を添加して、左官用モルタルを練混ぜた。水溶性アクリル系高分子を添加する前後でモルタルフロー値を測定し、添加後のダレの有無と作業性を評価した。４×４×16cmの供試体を作製し、材齢28日で電気抵抗率と長さ変化率を測定した。既設コンクリート板の上に、縦30cm、横30cm、厚さ３cmとなるように左官モルタルを打設し、材齢28日でひび割れの発生状況を観察した。
さらに、練混ぜた左官用モルタルを使用したときの、コンクリート構造物内部の鋼棒の防食性の評価を行った。結果を表１に併記する。
Experimental example 1
A mortar composition comprising a cement, a binder, a fine aggregate, a water reducing agent, and a fiber composed of an admixture of 5 parts of an expanding material, 5 parts of an expanding material, and 3 parts of a shrinkage reducing agent with respect to 100 parts of cement. A mortar for plastering with a mortar flow value shown in Table 1 was prepared using a mortar composition of water binder ratio and unit water amount shown in Table 1 with 1005 parts by volume of fiber in 100 parts by volume of the mortar composition. .
Thereafter, 0.5 part of a water-soluble acrylic polymer was added to 100 parts of cement, and a plastering mortar was mixed. The mortar flow value was measured before and after the addition of the water-soluble acrylic polymer, and the presence or absence of sagging and the workability after the addition were evaluated. A 4 × 4 × 16 cm specimen was prepared, and the electrical resistivity and the rate of change in length were measured at a material age of 28 days. Plastering mortar was placed on the existing concrete board so that it was 30cm long, 30cm wide and 3cm thick, and the occurrence of cracks was observed at the age of 28 days.
Furthermore, when the mixed plastering mortar was used, the corrosion resistance of the steel rod inside the concrete structure was evaluated. 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、密度3.15g/cm3、ブレーン値3,100cm2/g
膨張材Ａ ：エトリンガイト−石灰複合系膨張材、ブレーン値3,000cm2/g
膨張材Ｂ ：カルシウムサルホアルミネート系膨張材、ブレーン値6,000cm2/g
収縮低減剤：粉末収縮低減剤、市販品
繊維 ：ビニロン繊維、密度1.30g/cm3、市販品
減水剤 ：β−ナフタレンスルホン酸系減水剤、市販品
細骨材 ：石灰石砕砂、密度2.62g/cm3
水溶性アクリル系高分子：ポリアクリルアミド部分加水分解物、市販品
<Materials used>
Cement: Ordinary Portland cement, density 3.15g / cm 3 , brain value 3,100cm 2 / g
Expansion material A: Ettlingite-lime composite expansion material, brain value 3,000 cm 2 / g
Expansion material B: Calcium sulfoaluminate-based expansion material, brain value 6,000 cm 2 / g
Shrinkage reducing agent: powder shrinkage reducing agent, commercial product fiber: vinylon fiber, density 1.30 g / cm 3 , commercial product water reducing agent: β-naphthalenesulfonic acid-based water reducing agent, commercial product fine aggregate: limestone crushed sand, density 2.62 g / cm 3
Water-soluble acrylic polymer: polyacrylamide partial hydrolyzate, commercial product
＜測定方法＞
モルタルフロー値：調製したモルタルをJIS R 5201に準拠して測定。但し、水溶性アクリル系高分子の添加前は０打モルタルフロー値、添加後は15打モルタルフロー値（それぞれフローテーブルをタッピングしない静置状態での値と、15回タッピング後の値）。
電気抵抗率：供試体を作製した翌日に脱型し、20℃、60％RHで養生した後、四電極法にて測定（印加電圧10V、測定周波数73.3Hz）。
長さ変化率：東日本、中日本、西日本高速道路株式会社試験方法（JHS 416-2004）「断面修復材料品質規格試験方法」に準拠。収縮量の評価
ダレの有無：調製した左官モルタルをコテで塗り付け、ダレが生じた場合を不可、ダレがない場合を可とした。
作業性 ：粘性が強い、モルタルが軟らかすぎるなど、コテで扱いにくい場合を不可、粘性が小さく、扱いやすい場合を可とした。
ひび割れ ：ひび割れ抵抗性で、ひび割れが発生した場合を不可、ひび割れの発生がない場合を可とした。
防食性 ：単位セメント量が330kg/m3、水セメント比が60％、s/aが52％、NaClの添加量が12kg/m3のコンクリートで15×15×53cmの供試体を作製した。このとき、供試体の軸方向の中央にφ13mmのみがき鋼棒を設置した。コンクリートの表面近傍を切削し、陽極のチタンリボンを埋設した後、調製した左官用モルタルを充填した。電流密度0.03A/m2で電気防食を行い、１年後にみがき鋼棒の発錆の有無を観察した。みがき鋼棒の表面に錆が生じた場合は不可、錆が生じない場合を可とした。
<Measurement method>
Mortar flow value: Measure the prepared mortar according to JIS R 5201. However, before adding the water-soluble acrylic polymer, the mortar flow value was 0 strokes, and after the addition, the mortar flow value was 15 strokes (values in a static state without tapping the flow table and values after 15 taps).
Electrical resistivity: Demolded the day after the specimen was prepared, cured at 20 ° C and 60% RH, and then measured by the four-electrode method (applied voltage 10V, measuring frequency 73.3Hz).
Length change rate: Compliant with East Japan, Central Japan, West Japan Expressway Co., Ltd. test method (JHS 416-2004) "Cross-section restoration material quality standard test method". Evaluation of shrinkage: Presence / absence of sagging: The prepared plastering mortar was applied with a trowel, and when sagging occurred, it was not allowed, and when sagging was not allowed
Workability: Impossible when it is difficult to handle with a trowel such as strong viscosity or too soft mortar, and acceptable when the viscosity is small and easy to handle
Cracks: Crack resistance is not acceptable when cracks are generated, and when cracks are not generated.
Anticorrosion property: A specimen of 15 × 15 × 53 cm was made of concrete having a unit cement amount of 330 kg / m 3 , a water cement ratio of 60%, s / a of 52%, and an addition amount of NaCl of 12 kg / m 3 . At this time, a φ13 mm post-rolled steel bar was placed in the center of the specimen in the axial direction. After cutting the vicinity of the concrete surface and embedding an anode titanium ribbon, the prepared plastering mortar was filled. Electric corrosion protection was performed at a current density of 0.03 A / m 2 , and the presence or absence of rusting of the polished steel bar was observed after one year. When the surface of the polished steel bar was rusted, it was not possible.
表１より、水結合材比が高く、単位水量が多く、流動性の高いモルタルに水溶性アクリル系高分子を添加することにより、モルタルフロー値を低減し、ダレがなく、粘性が小さく、作業性が良好で、電気抵抗率が小さい左官用モルタルを調製できる。また、膨張材、収縮低減剤、及び繊維の併用により、収縮を低減できる。 From Table 1, the ratio of water binder is high, the amount of unit water is large, and by adding water-soluble acrylic polymer to mortar with high fluidity, the mortar flow value is reduced, there is no sag, the viscosity is small, and the work A plastering mortar with good properties and low electrical resistivity can be prepared. Moreover, shrinkage | contraction can be reduced by combined use of an expansion material, a shrinkage reducing agent, and a fiber.
実験例２
水結合材比を42％、単位水量を300kg/m3、水溶性アクリル系高分子を添加する前の０打モルタルフロー値を250mmとし、表２に示す水溶性アクリル系高分子を使用し、圧縮強度を測定したこと以外は実験例１と同様に行った。
なお、比較のために、メチルセルロースを添加した場合についても同様に行った。結果を表２に併記する。
Experimental example 2
The water-binding material ratio is 42%, the unit water volume is 300 kg / m 3 , the 0-stroke mortar flow value before adding the water-soluble acrylic polymer is 250 mm, and the water-soluble acrylic polymer shown in Table 2 is used. The same procedure as in Experimental Example 1 was performed except that the compressive strength was measured.
For comparison, the same procedure was performed when methylcellulose was added. The results are also shown in Table 2.
＜使用材料＞
メチルセルロース：市販品
<Materials used>
Methylcellulose: Commercial product
＜測定方法＞
圧縮強度 ：JIS R 5201に準拠し、材齢28日で測定。
<Measurement method>
Compressive strength: Measured according to JIS R 5201 at a material age of 28 days.
表２より、水溶性アクリル系高分子を添加することにより、作業性が良好で、電気抵抗率が小さく、強度発現性を阻害しない左官用モルタルを調製できる。粘性が小さく、コテ離れが良いため、充填性も良い。一方、メチルセルロースを添加した場合には、粘性が強くてコテ離れが悪く、強度発現性が阻害される。 From Table 2, by adding a water-soluble acrylic polymer, it is possible to prepare a plastering mortar that has good workability, low electrical resistivity, and does not inhibit strength development. Since the viscosity is small and the trowel is good, the filling property is also good. On the other hand, when methylcellulose is added, the viscosity is strong and the separation of the iron is bad, and the strength development is inhibited.
実験例３
実験No. 1-4で使用した左官用モルタルを使用し、表３に示す塗布量で有機−無機複合型塗膜養生剤を塗布したこと以外は実験例１と同様に行った。
なお、比較のために、従来の塗膜養生剤を使用した場合についても同様に行った。結果を表３に併記する。
Experimental example 3
The same procedure as in Experimental Example 1 was conducted except that the plastering mortar used in Experiment No. 1-4 was used and the organic-inorganic composite type coating curing agent was applied in the coating amount shown in Table 3.
In addition, it carried out similarly about the case where the conventional coating film curing agent is used for the comparison. The results are also shown in Table 3.
＜使用材料＞
有機−無機複合型塗膜養生剤：アクリル樹脂-フッ素雲母の複合型塗膜養生剤
従来の塗膜養生剤：ＥＶＡ系塗膜養生剤、市販品
<Materials used>
Organic-inorganic composite coating curing agent: Acrylic resin-fluorine mica composite coating curing agent Conventional coating curing agent: EVA coating curing agent, commercial product
表３より、有機−無機複合型塗膜養生剤を塗布することにより、モルタルの収縮がさらに低減されるばかりでなく、電気抵抗がさらに低減される。一方、従来の塗膜養生剤を塗布した場合には、そのような効果は見られない。 From Table 3, not only the shrinkage of the mortar is further reduced but also the electrical resistance is further reduced by applying the organic-inorganic composite type film curing agent. On the other hand, when a conventional coating film curing agent is applied, such an effect is not seen.
実験例４
単位セメント量が330kg/m3、水セメント比が60％、s/aが52％、NaClの添加量が12kg/m3のコンクリートで15×15×53cmの供試体を作製した。
このとき、供試体の軸方向の中央にφ13mmのみがき鋼棒を設置した。コンクリートの表面近傍を切削し、陽極のチタンリボンを埋設した後、実験No.1- 4の左官用モルタルを充填した。その後その表面に有機−無機複合型塗膜養生剤を200g/m2となるように塗布した。電流密度0.03A/m2で電気防食を行い、実験開始直後、１ヵ月後、６ヵ月後、及び１年後のモルタル硬化体の電気抵抗率を測定した。
また、１年後にみがき鋼棒の発錆の有無と左官用モルタルと塗膜の劣化の有無を観察した。
なお、有機−無機複合型塗膜養生剤を用いない場合と、比較として、有機系塗料を塗布した場合についても同様に行った。結果を表４に併記する。
Experimental Example 4
A 15 × 15 × 53 cm specimen was made of concrete having a unit cement amount of 330 kg / m 3 , a water cement ratio of 60%, an s / a of 52%, and a NaCl addition amount of 12 kg / m 3 .
At this time, a φ13 mm post-rolled steel bar was placed in the center of the specimen in the axial direction. After cutting near the surface of the concrete and embedding the anode titanium ribbon, it was filled with mortar for plastering in Experiment No.1-4. Thereafter, an organic-inorganic composite type coating curing agent was applied to the surface so as to be 200 g / m 2 . Electrocorrosion protection was performed at a current density of 0.03 A / m 2 , and the electrical resistivity of the mortar cured body was measured immediately after the start of the experiment, after 1 month, after 6 months, and after 1 year.
One year later, the polished steel bars were observed for rusting and for plastering mortars and coatings for deterioration.
In addition, it carried out similarly about the case where an organic type coating material is apply | coated as a comparison with the case where an organic-inorganic composite type coating film curing agent is not used. The results are also shown in Table 4.
＜使用材料＞
有機系塗料：エポキシ系、市販品
<Materials used>
Organic paint: Epoxy, commercially available
表４より、本発明の左官モルタルを使用し、その表面に有機−無機複合型塗膜養生剤を塗布することにより、長期的にモルタル硬化体の電気抵抗を小さく保つことができ、モルタルと塗膜の劣化がなく、高い防食効果が得られる。
一方、有機系塗料を使用した場合には、みがき鋼棒の発錆を抑制するが、塩素ガスなどが透過せず、モルタル硬化体と塗膜が劣化するため、長期的にモルタル硬化体の電気抵抗が増加する。
From Table 4, by using the plastering mortar of the present invention and applying an organic-inorganic composite film curing agent on its surface, the electrical resistance of the cured mortar can be kept small over the long term. There is no deterioration of the film, and a high anticorrosive effect is obtained.
On the other hand, when organic paint is used, rusting of polished steel bars is suppressed, but chlorine gas does not permeate and the mortar hardened body and coating film deteriorate. Resistance increases.
本発明によれば、水結合材比を高くしてもダレがなく、電気抵抗と収縮の両方が小さい左官用モルタルが得られ、また、収縮をさらに低減し、長期的にモルタル硬化体の電気抵抗を小さく保ち、塩素ガスなどの透過を妨げないものであり、塩害等により鋼材腐食を受けたコンクリート構造物の電気防食に用いた場合、コンクリート構造物内部にある鋼材の防食効果を高めることができる。 According to the present invention, it is possible to obtain a plastering mortar that does not sag even when the water binder ratio is increased, and that both electrical resistance and shrinkage are small. It keeps the resistance low and does not prevent the permeation of chlorine gas, etc., and when used for the electrical protection of concrete structures that have undergone steel corrosion due to salt damage, etc., it can enhance the corrosion protection effect of the steel materials inside the concrete structure. it can.
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