JP2012116703A - Cement composition - Google Patents
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- JP2012116703A JP2012116703A JP2010267628A JP2010267628A JP2012116703A JP 2012116703 A JP2012116703 A JP 2012116703A JP 2010267628 A JP2010267628 A JP 2010267628A JP 2010267628 A JP2010267628 A JP 2010267628A JP 2012116703 A JP2012116703 A JP 2012116703A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
Description
本発明は、耐酸性、耐久性及び施工性に優れるセメント組成物に関する The present invention relates to a cement composition excellent in acid resistance, durability and workability.
温泉地帯や下水処理施設などの酸性雰囲気では、コンクリートが酸により腐食・劣化するという問題が生じる。このような場所の劣化箇所の補修方法としては、劣化部を除去した後に耐酸性を有する補修材でコンクリート表面を被覆する方法が実施されている。補修材料としては、ポルトランドセメントに高炉スラグ微粉末及び高炉スラグ細骨材を配合したモルタル（特許文献１）、アルミナセメントに高炉スラグ微粉末やポリマーを配合したモルタル（特許文献２）が提案されている。また、補修工法としては、高炉スラグ微粉末を用いたモルタルでコンクリートを被覆した後、モルタル表面にエポキシ樹脂やアクリル樹脂を塗布する方法が提案されている（特許文献３、４）。 In an acidic atmosphere such as a hot spring area or a sewage treatment facility, there is a problem that the concrete is corroded and deteriorated by acid. As a method for repairing a deteriorated part in such a place, a method of covering the concrete surface with a repair material having acid resistance after removing the deteriorated part has been implemented. As repair materials, mortar (Patent Document 1) in which Portland cement is blended with blast furnace slag fine powder and blast furnace slag fine aggregate (Patent Document 1), and mortar (Patent Document 2) in which alumina cement is blended with blast furnace slag fine powder and polymer have been proposed. Yes. In addition, as a repair method, there has been proposed a method in which concrete is covered with mortar using blast furnace slag fine powder, and then an epoxy resin or an acrylic resin is applied to the mortar surface (Patent Documents 3 and 4).
しかしながら、従来の技術による補修材料は、下地コンクリートとの付着強度が低下して補修材の浮きや剥離が生じたり、ひび割れが発生したり、施工欠陥が生じるなどの問題がある。これらの欠陥は外部からの酸の浸透経路となり得るため、仮に補修材自身の耐酸性が良好であったとしても、補修対象となるコンクリートを酸による腐食・劣化から十分に保護することは困難であった。
従って、本発明の課題は、下地コンクリートとの十分な付着強度を有し、剥離やひび割れがなく、耐酸性及び耐久性を有し、かつ施工性も良好なセメント組成物を提供することにある。
However, the repair material according to the conventional technique has problems such as a decrease in adhesion strength with the ground concrete, causing the repair material to float or peel off, cracking, or construction defects. Since these defects can be an acid penetration path from the outside, even if the repair material itself has good acid resistance, it is difficult to sufficiently protect the concrete to be repaired from corrosion and deterioration due to acid. there were.
Accordingly, an object of the present invention is to provide a cement composition having sufficient adhesion strength with the underlying concrete, having no peeling or cracking, acid resistance and durability, and good workability. .
本発明者は、従来の補修材料に配合されている成分について検討したところ、本来、セメントとの水和反応により緻密な硬化体を生成させる目的で配合されている高炉スラグ微粉末は、硬化体の柔軟性を低下させ、硬化体の収縮率を増大させる作用があるため、下地コンクリートとの付着強度が低下しやすく、ひび割れを生じやすくしている可能性が考えられた。また、付着強度を改善する目的で配合されているポリマー作用により、材料の粘性が高くなり、コテ塗り等の施工性を低下させていることも判明した。
そこで、本発明者は、補修用セメント組成物の組成について再検討したところ、ポルトランドセメント及びスラグ骨材に加えて、一定量の有機系界面活性剤を有効成分とする収縮低減剤及び樹脂成分を配合し、かつスラグ微粉末を実質的に含まない組成にすれば、圧縮強度が十分に高く、下地コンクリートとの付着強度が高く、ひび割れが生じ難く、耐酸性と施工性の良好なセメント組成物が得られることを見出し、本発明を完成した。
The present inventor examined the components blended in the conventional repair material, and the blast furnace slag fine powder originally blended for the purpose of producing a dense hardened body by hydration reaction with cement is a hardened body. This has the effect of reducing the flexibility of the resin and increasing the shrinkage rate of the cured body, so that the adhesion strength with the ground concrete tends to be lowered, and the possibility of cracking is likely. It has also been found that the polymer action added for the purpose of improving the adhesion strength increases the viscosity of the material and lowers the workability such as ironing.
Therefore, the present inventor reconsidered the composition of the cement composition for repair, and in addition to Portland cement and slag aggregate, a shrinkage reducing agent and a resin component containing a certain amount of an organic surfactant as an active ingredient were added. When blended and made into a composition that does not substantially contain fine slag powder, the compressive strength is sufficiently high, the adhesion strength to the ground concrete is high, cracking is unlikely to occur, and the cement composition has good acid resistance and workability. Was found and the present invention was completed.
すなわち、本発明は、（ａ）ポルトランドセメント、（ｂ）スラグ骨材、（ｃ）ポルトランドセメント１００重量部に対して０．１〜２重量部の有機系界面活性剤を有効成分とする収縮低減剤及び（ｄ）ポルトランドセメント１００重量部に対して０．１〜２．５重量部の樹脂成分を含み、スラグ微粉末を実質的に含まないセメント組成物を提供するものである。 That is, the present invention provides shrinkage reduction comprising 0.1 to 2 parts by weight of an organic surfactant as an active ingredient per 100 parts by weight of (a) Portland cement, (b) slag aggregate, and (c) Portland cement. And (d) a cement composition containing 0.1 to 2.5 parts by weight of a resin component with respect to 100 parts by weight of Portland cement and substantially free of fine slag powder.
本発明のセメント組成物を用いれば、圧縮強度６０Ｎ／ｍｍ2以上であり、曲げ強度／圧縮強度比が０．１５以上で、乾燥収縮率が０．１％未満という硬化体が得られ、下地コンクリートとの付着強度が高く、ひび割れが生じ難く、さらに耐酸性に優れ、かつ施工性も良好である。従って本発明のセメント組成物は、耐酸性補修用セメント組成物として特に有用である。 By using the cement composition of the present invention, a cured product having a compressive strength of 60 N / mm 2 or more, a bending strength / compressive strength ratio of 0.15 or more, and a drying shrinkage of less than 0.1% is obtained. It has high adhesion strength with concrete, hardly cracks, has excellent acid resistance, and has good workability. Therefore, the cement composition of the present invention is particularly useful as an acid-resistant repair cement composition.
本発明のセメント組成物は、（ａ）ポルトランドセメント、（ｂ）スラグ骨材、（ｃ）ポルトランドセメント１００重量部に対して０．１〜２重量部の有機系界面活性剤を有効成分とする収縮低減剤及び（ｄ）ポルトランドセメント１００重量部に対して０．１〜２．５重量部の樹脂成分を含み、スラグ微粉末を実質的に含まない。 The cement composition of the present invention comprises (a) Portland cement, (b) slag aggregate, and (c) 0.1 to 2 parts by weight of an organic surfactant based on 100 parts by weight of Portland cement. The shrinkage reducing agent and (d) 0.1 to 2.5 parts by weight of a resin component with respect to 100 parts by weight of Portland cement, and substantially free of slag fine powder.
本発明に用いられる（ａ）ポルトランドセメントは、モルタルの結合相を形成する主要成分であり、例えば普通、早強、超早強又は中庸熱等のいずれのポルトランドセメントでも使用することができる。コストや扱い性の点からは普通ポルトランドセメントが好ましいが、早強又は超早強ポルトランドセメントを使用するかこれと普通ポルトランドセメントを併用してもよい。 The (a) Portland cement used in the present invention is a main component that forms a mortar binder phase. For example, any Portland cement, such as normal, early strength, very early strength, or moderate heat, can be used. Ordinary Portland cement is preferable from the viewpoint of cost and handleability, but early strength or very early strength Portland cement may be used, or ordinary Portland cement may be used in combination.
本発明で使用する（ｂ）スラグ骨材は、スラグ微粉末を実質的に含まないものである。一般的に使用されているブレーン比表面積４０００ｃｍ2／ｇの高炉スラグ微粉末の平均粒径は１０μｍ程度であるが、本発明で使用するスラグ骨材は粒径１０μｍ以下の微粒分量が１重量％未満であり、スラグ微粉末を実質的に含まない。スラグ骨材の粒径は０．１５ｍｍ以上が好ましく、特にセメント組成物がモルタルの場合はＦ.Ｍ.＝２.５程度のスラグ骨材が好適に使用できる。
また、スラグ骨材としては、高炉スラグ骨材、転炉スラグ骨材、銅スラグ骨材、下水汚泥溶融スラグ骨材、都市ゴミ溶融スラグ骨材などが挙げられるが、本発明では、高炉急冷スラグ骨材が特に好適に使用できる。高炉急冷スラグ骨材は反応活性があり、セメントと骨材との界面が強固になるため、高い耐酸性を確保するのに有利である。
スラグ骨材の含有量は、ポルトランドセメント１００重量部に対し、５０〜７００重量部が好ましく、前記のような骨材粒径範囲のモルタルでは８０〜３００重量部が特に好ましい。この配合範囲では、硬化体の優れた強度や耐酸性が得られ、施工性が良好である。
The (b) slag aggregate used in the present invention is substantially free of slag fine powder. The average particle size of blast furnace slag fine powder having a specific surface area of 4000 cm 2 / g of Blaine, which is generally used, is about 10 μm, but the slag aggregate used in the present invention has a fine particle amount of 10 wt. And is substantially free of slag fine powder. The particle size of the slag aggregate is preferably 0.15 mm or more. Particularly when the cement composition is mortar, a slag aggregate of about FM = 2.5 can be suitably used.
Examples of the slag aggregate include blast furnace slag aggregate, converter slag aggregate, copper slag aggregate, sewage sludge fusion slag aggregate, municipal waste fusion slag aggregate, etc. Aggregates can be used particularly preferably. Blast furnace quenching slag aggregate is reactive and has a strong interface between cement and aggregate, which is advantageous for ensuring high acid resistance.
The content of the slag aggregate is preferably 50 to 700 parts by weight with respect to 100 parts by weight of Portland cement, and particularly preferably 80 to 300 parts by weight in the mortar having the above-mentioned aggregate particle size range. In this blending range, excellent strength and acid resistance of the cured body can be obtained, and workability is good.
本発明のセメント組成物では、硬化体の収縮を低減して、ひび割れ抵抗性やコンクリートとの付着強度を高めるために（ｃ）有機系界面活性剤を有効成分とする収縮低減剤を含有する。特に、本発明のセメント組成物のように樹脂成分を配合する場合は、粘性の増加により施工性（コテ離れ）が低下し易くなるため、それを改善するために有機系の収縮低減成分を併用することが好ましい。
本発明で用いる収縮低減剤としては、硬化体中の水の表面張力を低下させる作用を有する有機系界面活性剤を有効成分とするものが使用できる。有機系界面活性剤としては、低級アルコールアルキレンオキシド付加物、ポリエーテル、グリコールエーテル誘導体、プロピレングリコールエーテル類などを主成分とする界面活性剤が挙げられ、収縮低減性能の面から、低級アルコールアルキレンオキシド付加物を主成分とする界面活性剤の使用が好ましい。これらの界面活性剤は、液状あるいは吸油性の粉体や繊維などに界面活性成分を担持させた粉末状のものがセメント組成物用の収縮低減剤として市販されており、粉末状の収縮低減剤を用いると、セメント組成物を構成するセメントや骨材などの粉粒体成分と予め混合して使用することができるため、製造品質の安定化や施工効率の向上の面から特に好ましい。
The cement composition of the present invention contains (c) a shrinkage reducing agent containing an organic surfactant as an active ingredient in order to reduce shrinkage of the cured body and increase crack resistance and adhesion strength with concrete. In particular, when a resin component is blended as in the cement composition of the present invention, the workability (separation from the iron) is likely to decrease due to an increase in viscosity, so an organic shrinkage reducing component is used in combination to improve it. It is preferable to do.
As the shrinkage reducing agent used in the present invention, an organic surfactant having an action of reducing the surface tension of water in the cured product can be used. Examples of organic surfactants include surfactants mainly composed of lower alcohol alkylene oxide adducts, polyethers, glycol ether derivatives, propylene glycol ethers, etc. From the viewpoint of shrinkage reduction performance, lower alcohol alkylene oxides. The use of a surfactant mainly composed of an adduct is preferred. These surfactants are commercially available as shrinkage reducing agents for cement compositions in the form of powders in which a surface active component is supported on liquid or oil-absorbing powders or fibers. Is particularly preferred from the standpoints of stabilization of manufacturing quality and improvement of construction efficiency because it can be used by mixing in advance with powder and granule components such as cement and aggregate constituting the cement composition.
本発明において、（ｃ）有機系界面活性剤を有効成分とする収縮低減剤は、ポルトランドセメント１００重量部に対して０．１〜２重量部の含有量で用いるのが良い。より好ましくは０．３〜１．５重量部、さらに好ましくは０．５〜１．０重量部の範囲で配合するのが良い。この範囲で配合すると、硬化体の収縮が効果的に低減されて良好な硬化物性（ひび割れ抵抗性、付着強度）が得られるとともに、良好な施工性（コテ離れ、付着性）が確保できる。 In the present invention, (c) a shrinkage reducing agent containing an organic surfactant as an active ingredient is preferably used in an amount of 0.1 to 2 parts by weight with respect to 100 parts by weight of Portland cement. More preferably, it is 0.3-1.5 weight part, More preferably, it is good to mix | blend in 0.5-1.0 weight part. When it mix | blends in this range, while shrinkage | contraction of a hardening body is reduced effectively, favorable hardened | cured material property (crack resistance, adhesion strength) will be obtained, and favorable workability (steel separation, adhesion) can be ensured.
さらに、本発明のセメント組成物には、無機系の膨張材を有効成分とする収縮低減剤を有機系収縮低減剤と併せて含有使用することができる。無機系の膨張材とは、水和反応により膨張性を発揮してセメント組成物に生じる収縮を低減する材料であり、ＪＩＳ Ａ６２０２に規定される石灰系やエトリンガイト系の膨張材が使用できる。有機系収縮低減剤と無機系の膨張材のように収縮低減機構の異なる収縮低減成分を併用することにより、セメント組成物の硬化体に生じる収縮をより効果的に低減でき、さらには、曲げ強度／圧縮強度比も向上させることができる。無機系膨張材は、ポルトランドセメント１００重量部に対して０〜１０重量部含有使用することができ、特に２〜５重量部が好ましい。無機系膨張材をこの範囲で配合して有機系収縮低減剤と併用すると、より良好な硬化物性（ひび割れ抵抗性、付着強度）が得られる。 Furthermore, the cement composition of the present invention can contain and use a shrinkage reducing agent containing an inorganic expansion material as an active ingredient together with an organic shrinkage reducing agent. The inorganic expansion material is a material that exhibits expansion by a hydration reaction and reduces shrinkage generated in the cement composition, and a lime-based or ettringite-based expansion material defined in JIS A6202 can be used. By using a combination of shrinkage-reducing components with different shrinkage-reducing mechanisms, such as organic shrinkage reducing agents and inorganic expansion materials, shrinkage that occurs in the hardened body of the cement composition can be reduced more effectively. / Compressive strength ratio can also be improved. The inorganic expansion material can be used in an amount of 0 to 10 parts by weight with respect to 100 parts by weight of Portland cement, and 2 to 5 parts by weight is particularly preferable. When an inorganic expansion material is blended in this range and used in combination with an organic shrinkage reducing agent, better cured properties (crack resistance, adhesion strength) can be obtained.
本発明のセメント組成物では、硬化体のひび割れ抵抗性やコンクリートとの付着強度を高めるとともに、良好な施工性（コンクリートとの付着性）を得るために（ｄ）樹脂成分を含有する。特に、セメント組成物に低級アルコールアルキレンオキシド付加物などを主成分とする有機系収縮低減剤を配合する場合は、コンクリートとの付着性が低下する場合があるため、それを改善するために樹脂成分を併用することが好ましい。
本発明における樹脂成分としては、ＪＩＳ Ａ６２０３に規定されるポリマーディスパージョン又は再乳化性粉末樹脂が使用できる。再乳化性粉末樹脂を用いると、セメント組成物を構成するセメントや骨材などの粉粒体成分と予め混合して使用することができるため、製造品質の安定化や施工効率の向上の面から特に好ましい。再乳化性粉末樹脂としては、具体的には、スチレンブタジエンゴム、エチレン酢酸ビニル、エチレン酢酸ビニルビニルバーサテート、酢酸ビニルビニルバーサテート、スチレンアクリル酸エステル、ポリアクリル酸エステル、酢酸ビニルビニルバーサテートアクリル酸エステル等の樹脂が挙げられる。高い耐酸性とコンクリートとの良好な付着性を確保するためにはアクリル系の樹脂が適しており、特にアクリル酸エステル・メタクリル酸エステル共重合体を主成分とするポリアクリル酸エステルが好適に使用できる。
The cement composition of the present invention contains (d) a resin component in order to increase the cracking resistance of the cured body and the adhesion strength with concrete, and to obtain good workability (adhesion with concrete). In particular, when an organic shrinkage reducing agent mainly composed of a lower alcohol alkylene oxide adduct or the like is added to the cement composition, the adhesiveness to concrete may be lowered. It is preferable to use together.
As the resin component in the present invention, a polymer dispersion or a re-emulsifiable powder resin specified in JIS A6203 can be used. When re-emulsifiable powder resin is used, it can be used by mixing in advance with powder and granule components such as cement and aggregate constituting the cement composition. From the viewpoint of stabilization of manufacturing quality and improvement of construction efficiency Particularly preferred. Specific examples of the re-emulsifiable powder resin include styrene butadiene rubber, ethylene vinyl acetate, ethylene vinyl acetate vinyl versatate, vinyl acetate vinyl versatate, styrene acrylate ester, polyacrylate ester, and vinyl acetate vinyl versatate acrylic. Examples include resins such as acid esters. Acrylic resin is suitable for ensuring high acid resistance and good adhesion to concrete, especially polyacrylic acid ester mainly composed of acrylate / methacrylate copolymer. it can.
本発明で用いる（ｄ）樹脂成分は、ポルトランドセメント１００重量部に対して固形分換算で０．１〜２．５重量部の含有量で用いるのが良い。より好ましくは０．５〜２重量部、さらに好ましくは０．８〜１．５重量部の範囲で含有するのが良い。この範囲で配合すると、硬化体の曲げ強度／圧縮強度比が高くなってひび割れ抵抗性が向上し、コンクリートとの付着強度が高まり、さらには良好な施工性（コテ伸び、コテ離れ、付着性）が確保できる。 The resin component (d) used in the present invention is preferably used in a content of 0.1 to 2.5 parts by weight in terms of solid content with respect to 100 parts by weight of Portland cement. More preferably 0.5 to 2 parts by weight, and still more preferably 0.8 to 1.5 parts by weight. If blended in this range, the bending strength / compression strength ratio of the cured product will be increased, crack resistance will be improved, the adhesion strength to concrete will be increased, and good workability (steel elongation, iron separation, adhesion) Can be secured.
また、本発明のセメント組成物は、スラグ微粉末を実質的に含有しない。スラグ微粉末を使用したセメント組成物では、硬化体の収縮率の増大や、曲げ強度／圧縮強度比が低下して硬化体の柔軟性が損なわれるという現象が生じる。そのため、そのようなセメント組成物をコンクリート構造物に耐酸性を付与するための補修材として用いると、補修材にひび割れが生じたり、コンクリートとの付着強度が低下して補修材が剥離するなどの不具合が生じ、結果として、コンクリート構造物の耐酸性を確保することが困難となる。
ここで実質的に含有しないとは、本発明のセメント組成物では、粒径１０μｍ以下の微粒分量が１重量％未満のスラグ骨材を使用するということである。
Moreover, the cement composition of this invention does not contain slag fine powder substantially. In the cement composition using the slag fine powder, the shrinkage rate of the cured body is increased and the bending strength / compressive strength ratio is lowered to deteriorate the flexibility of the cured body. Therefore, when such a cement composition is used as a repair material for imparting acid resistance to a concrete structure, the repair material will crack, the adhesion strength with concrete will decrease, and the repair material will peel off. Problems arise, and as a result, it becomes difficult to ensure the acid resistance of the concrete structure.
“Substantially not contained” means that the cement composition of the present invention uses a slag aggregate having a particle size of 10 μm or less and having a fine particle content of less than 1% by weight.
本発明のセメント組成物には、さらに高分子、金属、カーボン又は耐アルカリ性ガラス等の繊維、減水剤、保水剤、空気連行剤、消泡剤等を配合することができる。 The cement composition of the present invention can further contain fibers such as polymer, metal, carbon or alkali-resistant glass, water reducing agent, water retention agent, air entraining agent, antifoaming agent and the like.
本発明のセメント組成物を用いれば、圧縮強度６０Ｎ／ｍｍ2以上、曲げ強度／圧縮強度比が０．１５以上で、乾燥収縮率０．１％未満のモルタルが形成できる。従って、下地コンクリートとの付着強度が高く、ひび割れが生じ難く、耐酸性にも優れる。また、コテ塗り等の施工性も良好である。従って、本発明のセメント組成物は、コンクリートの補修用セメントとして有用であり、特に耐酸性が要求されるコンクリートの補修用として有用である。 By using the cement composition of the present invention, a mortar having a compressive strength of 60 N / mm 2 or more, a bending strength / compressive strength ratio of 0.15 or more, and a drying shrinkage of less than 0.1% can be formed. Therefore, the adhesion strength with the ground concrete is high, cracks are hardly generated, and the acid resistance is excellent. In addition, workability such as ironing is also good. Therefore, the cement composition of the present invention is useful as a cement for repairing concrete, and particularly useful for repairing concrete requiring acid resistance.
次に実施例を挙げて本発明をさらに詳細に説明する。 EXAMPLES Next, an Example is given and this invention is demonstrated still in detail.
（使用材料）
普通ポルトランドセメント（ＮＣ）：太平洋セメント社製 普通ポルトランドセメント
アルミナセメント（ＡＣ）：ラファージュ社製 セカール５１ＢＴＦ
スラグ骨材（ＢＳ）：高炉急冷スラグ骨材市販品（Ｆ．Ｍ．＝２．５、最大粒径２.５ｍｍ、１０μｍ通過分１重量％未満）
珪砂細骨材（ＳＳ）：山形県産珪砂市販品（Ｆ．Ｍ．＝２．５、最大粒径２.５ｍｍ）
高炉スラグ微粉末：デイ・シイ社製 セラメント（ブレーン４０００ｃｍ2／ｇ）
繊維：ナイロン短繊維市販品
減水剤：花王社製 マイティー１００（ナフタレン系減水剤）
有機系収縮低減剤：太平洋マテリアル社製 テトラガードＰＷ（有効成分：低級アルコールアルキレンオキシド付加物）
無機系収縮低減剤（膨張材）：太平洋マテリアル社製太平洋エクスパン（石灰系膨張材）
粉末樹脂：アクリル酸エステル・メタクリル酸エステル共重合再乳化型粉末樹脂市販品
保水剤：メチルセルロース系保水剤市販品
消泡剤：ＡＤＥＫＡ社製 アデカネートＢ３１７Ｆ（非イオン系消泡剤）
(Materials used)
Normal Portland cement (NC): Taiheiyo Cement, Inc. Normal Portland cement Alumina cement (AC): Lafarge, SECAL 51BTF
Slag aggregate (BS): Blast furnace quenching slag aggregate commercial product (FM = 2.5, maximum particle size 2.5 mm, 10 μm passage less than 1% by weight)
Silica sand fine aggregate (SS): Commercial product of Yamagata quartz sand (FM = 2.5, maximum particle size 2.5 mm)
Blast furnace slag fine powder: Seraiment (Brain 4000cm 2 / g)
Fiber: Nylon short fiber commercial water reducing agent: Mighty 100 (Naphthalene water reducing agent) manufactured by Kao Corporation
Organic shrinkage reducing agent: Tetragard PW (active ingredient: lower alcohol alkylene oxide adduct) manufactured by Taiheiyo Materials Co., Ltd.
Inorganic shrinkage reducing agent (expansion material): Pacific Expan (lime-based expansion material) manufactured by Taiheiyo Materials Co., Ltd.
Powder resin: Acrylic acid ester / methacrylic acid ester copolymer re-emulsification type powder resin Commercial product water retention agent: Methylcellulose-based water retention agent commercial product Defoaming agent: ADEKA Adecanate B317F (nonionic defoaming agent)
（性能評価試験）
表１に示す配合割合のセメント組成物の粉体部分１００重量部に対して水１４重量部を加えてホバートミキサで混合し、試験用のモルタルを調整した。得られたモルタルを用いて、以下の性能評価を行った。評価結果を表２及び表３に示す。
(Performance evaluation test)
A test mortar was prepared by adding 14 parts by weight of water to 100 parts by weight of the powder part of the cement composition having the blending ratio shown in Table 1 and mixing with a Hobart mixer. The following performance evaluation was performed using the obtained mortar. The evaluation results are shown in Tables 2 and 3.
（１）施工性：１０℃７０％Ｒ．Ｈ．、２０℃７０％Ｒ．Ｈ．、３０℃７０％Ｒ．Ｈ．の環境下で、以下の評価試験を行った。
モルタルフロー：ＪＩＳ Ｒ５２０１に準じた方法で、練り混ぜ直後と３０分経過後のモルタルフローを測定した。
コテ作業性（コテ伸び・コテ離れ・下地コンクリートへの付着性の評価）：混合してから１５分後のモルタルをコンクリート平板（３００×９００×６０ｍｍ）にコテで厚さ２０ｍｍに塗付け、コテ作業性を評価した。
（２）曲げ強度、圧縮強度、曲げ強度／圧縮強度比：ＪＩＳ Ｒ５２０１に準じた方法で、２０℃で水中養生したときの材齢２８日の曲げ強度及び圧縮強度を測定し、曲げ強度／圧縮強度比を算出した。
（３）乾燥収縮率：ＪＩＳ Ａ１１２９に準じた方法で、２０℃６０％Ｒ．Ｈ．の環境下で養生したときの乾燥収縮率を測定した。
（４）付着強度：コンクリート平板（３００×３００×６０ｍｍ）にモルタルを厚さ２０ｍｍにコテで塗付けて２０℃６０％Ｒ．Ｈ．の環境下で養生し、日本建築仕上材工業会規格（ＮＳＫＳ−００７）に準じた方法で、コンクリート平板に対するモルタルの材齢２８日の付着強度を測定した。
（５）ひび割れ抵抗性：コンクリート平板（３００×９００×６０ｍｍ）にモルタルを厚さ２０ｍｍにコテで塗付け、２０℃７０％Ｒ．Ｈ．の環境下で２８日間養生した後のひび割れ発生状況を目視確認した。
（６）耐酸性：モルタル円柱状試験体（φ７５×１５０ｍｍ）を作成し、東京都下水道局「コンクリート改修技術マニュアル・汚泥処理施設編」に準じた方法で、２０℃の環境下で５％硫酸溶液に２８日間浸漬（５％硫酸溶液は７日毎に全量交換）した後、試験体中央部を試験体底面と平行に切断し、１％フェノールフタレイン溶液の呈色範囲をノギスを用いて測定して硫酸浸透深さを算出した。
(1) Workability: 10 ° C. 70% R.D. H. , 20 ° C. 70% R.V. H. , 30 ° C. 70% R.V. H. The following evaluation tests were conducted in the environment of.
Mortar flow: By a method according to JIS R5201, the mortar flow was measured immediately after kneading and after 30 minutes.
Iron workability (Evaluation of iron elongation, iron separation, and adhesion to ground concrete): 15 minutes after mixing, mortar was applied to a concrete flat plate (300 x 900 x 60 mm) with a iron to a thickness of 20 mm. Workability was evaluated.
(2) Bending strength, compressive strength, bending strength / compressive strength ratio: Measure the bending strength and compressive strength at the age of 28 days when cured in water at 20 ° C. according to JIS R5201 to determine the bending strength / compressive strength. The intensity ratio was calculated.
(3) Drying shrinkage ratio: A method according to JIS A1129, at 20 ° C. and 60% R.D. H. The dry shrinkage rate was measured when cured under the above environment.
(4) Adhesive strength: A mortar was applied to a concrete flat plate (300 × 300 × 60 mm) with a trowel to a thickness of 20 mm, and a 20 ° C. 60% H. The adhesion strength of the mortar on the concrete flat plate was measured by a method according to the Japan Building Finishing Material Manufacturers Association Standard (NSKS-007).
(5) Crack resistance: A mortar was applied to a concrete flat plate (300 × 900 × 60 mm) with a trowel to a thickness of 20 mm, and 20 ° C. 70% R.D. H. The condition of occurrence of cracking after curing for 28 days in the environment was visually confirmed.
(6) Acid resistance: A mortar cylindrical specimen (φ75 × 150mm) was prepared, and 5% sulfuric acid in an environment of 20 ° C in a method according to the Tokyo Metropolitan Sewerage Bureau “Concrete Refurbishment Technical Manual / Sludge Treatment Facility” After soaking in the solution for 28 days (the 5% sulfuric acid solution is completely exchanged every 7 days), the center of the specimen is cut parallel to the bottom of the specimen, and the color range of the 1% phenolphthalein solution is measured using calipers. Then, the sulfuric acid penetration depth was calculated.
（施工性の評価）
実施例１〜９はいずれも良好な施工性を有していた。
(Evaluation of workability)
Examples 1 to 9 all had good workability.
有機系収縮低減剤と粉末樹脂を共に配合しないと、付着性がやや悪くなる（比較例１）。
有機系収縮低減剤のみを配合し、粉末樹脂を配合しないと、付着性が悪くなる（比較例２）。粉末樹脂のみを配合し、有機系収縮低減剤を配合しないと、コテ離れが悪くなる（比較例３）。高炉スラグ微粉末を配合すると、配合量が多いほどコテ伸びと付着性が低下する（比較例５、６）。有機系収縮低減剤の配合量が多いと付着性が低下する（比較例７）。粉末樹脂の配合量が多いとコテ伸びがやや悪くなり、コテ離れが低下する（比較例８）。アルミナセメント（ＡＣ）を用いると、フローの低下が大きく、コテ伸びと付着性が低下する（比較例９）。
If both the organic shrinkage reducing agent and the powder resin are not blended, the adhesion is slightly deteriorated (Comparative Example 1).
If only the organic shrinkage reducing agent is blended and the powder resin is not blended, the adhesiveness is deteriorated (Comparative Example 2). If only the powder resin is blended and the organic shrinkage reducing agent is not blended, the iron separation becomes worse (Comparative Example 3). When a blast furnace slag fine powder is mix | blended, iron elongation and adhesiveness will fall, so that there are many compounding quantities (comparative examples 5 and 6). If the amount of the organic shrinkage reducing agent is too large, the adhesiveness decreases (Comparative Example 7). When there is much compounding quantity of powder resin, iron elongation will become a little bad and iron separation will fall (comparative example 8). When alumina cement (AC) is used, the flow is greatly reduced, and the iron elongation and adhesion are reduced (Comparative Example 9).
（曲げ・圧縮強度、収縮、付着強度、ひび割れ抵抗性、耐酸性の評価）
実施例１〜９はいずれも良好な性能を有していた。
圧縮強度６０Ｎ／ｍｍ2以上、曲げ強度／圧縮強度比０．１５以上、乾燥収縮率が０．１％未満であり、良好な耐久性能（付着強度２．５Ｎ以上、高いひび割れ抵抗性）と高い耐酸性能（硫酸浸透深さが２．５ｍｍ以下）を有していた。
また、有機系収縮低減剤と無機系収縮低減剤（膨張材）を併用した配合（実施例５）は、膨張材を使用しない配合（実施例６）に比べ、曲げ強度／圧縮強度比が高く、乾燥収縮率が小さく、耐久性能（付着強度、高いひび割れ抵抗性）をさらに向上させることができる。
(Evaluation of bending / compression strength, shrinkage, adhesion strength, crack resistance, acid resistance)
Examples 1-9 all had good performance.
Compressive strength 60N / mm 2 or more, bending strength / compressive strength ratio 0.15 or more, dry shrinkage rate is less than 0.1%, good durability performance (adhesion strength 2.5N or more, high crack resistance) and high It had acid resistance (sulfuric acid penetration depth of 2.5 mm or less).
Further, the combination (Example 5) in which the organic shrinkage reducing agent and the inorganic shrinkage reducing agent (expanding material) are used in combination has a higher bending strength / compressive strength ratio than the combination without using the expanding material (Example 6). Further, the drying shrinkage rate is small, and the durability performance (adhesion strength, high crack resistance) can be further improved.
有機系収縮低減剤と粉末樹脂を共に配合しないと、曲げ強度と曲げ／圧縮比が低下し、乾燥収縮率が増大し、付着強度・ひび割れ抵抗性、耐酸性が悪化する（比較例１）。有機系収縮低減剤のみを配合し、粉末樹脂を配合しないと、曲げ強度と曲げ／圧縮比、付着強度、ひび割れ抵抗性が低下する（比較例２）。粉末樹脂のみを配合し、有機系収縮低減剤を配合しないと、乾燥収縮率が増大し、付着強度、ひび割れ抵抗性が悪化する（比較例３）。骨材に珪砂細骨材（ＳＳ）を用いると、耐酸性が大きく低下する（比較例４）。高炉スラグ微粉末を配合すると、配合量が多いほど、曲げ強度と曲げ／圧縮比が低下し、乾燥収縮率が増大し、付着強度・ひび割れ抵抗性が悪化する（比較例５、６）。有機系収縮低減剤の配合量が多いと、乾燥収縮率は低下するが、付着強度が若干低下する（比較例７）。粉末樹脂の配合量が多いと曲げ強度と曲げ／圧縮比は向上するが、耐酸性がやや低下する（比較例８）。アルミナセメント（ＡＣ）を用いた場合は、曲げ／圧縮比がやや低く、付着強度とひび割れ抵抗性が低下する（比較例９）。 If both the organic shrinkage reducing agent and the powder resin are not blended, the bending strength and the bending / compression ratio are lowered, the drying shrinkage ratio is increased, and the adhesion strength / crack resistance and acid resistance are deteriorated (Comparative Example 1). If only the organic shrinkage reducing agent is blended and the powder resin is not blended, the bending strength, the bending / compression ratio, the adhesion strength, and the cracking resistance are reduced (Comparative Example 2). If only the powder resin is blended and the organic shrinkage reducing agent is not blended, the drying shrinkage rate increases, and the adhesion strength and crack resistance deteriorate (Comparative Example 3). When silica sand fine aggregate (SS) is used for the aggregate, the acid resistance is greatly reduced (Comparative Example 4). When the blast furnace slag fine powder is blended, as the blending amount increases, the bending strength and the bending / compression ratio decrease, the drying shrinkage rate increases, and the adhesion strength and crack resistance deteriorate (Comparative Examples 5 and 6). When the amount of the organic shrinkage reducing agent is large, the drying shrinkage rate is lowered, but the adhesion strength is slightly lowered (Comparative Example 7). When the blending amount of the powder resin is large, the bending strength and the bending / compression ratio are improved, but the acid resistance is slightly lowered (Comparative Example 8). When alumina cement (AC) is used, the bending / compression ratio is slightly low, and the adhesion strength and crack resistance are reduced (Comparative Example 9).
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