JP2009102216A - Cement composition - Google Patents

Cement composition Download PDF

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JP2009102216A
JP2009102216A JP2008052799A JP2008052799A JP2009102216A JP 2009102216 A JP2009102216 A JP 2009102216A JP 2008052799 A JP2008052799 A JP 2008052799A JP 2008052799 A JP2008052799 A JP 2008052799A JP 2009102216 A JP2009102216 A JP 2009102216A
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cement composition
resin powder
mortar
cement
composition according
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Koichi Nishimura
浩一 西村
Yuji Mito
裕治 水戸
Koji Onishi
宏二 大西
Yukihiko Okada
由紀彦 岡田
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Ube Corp
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Ube Industries Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10Coating or impregnating
    • C04B20/1018Coating or impregnating with organic materials
    • C04B20/1029Macromolecular compounds
    • C04B20/1033Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482Coating or impregnation materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72Repairing or restoring existing buildings or building materials

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cement composition which can be used for mortar for troweling, such as a plastering material, a roof material, a wall material and a water proofing material, mortar for spraying, a cross-section restoring material used for repairing and reinforcing civil engineering structures, a grout material or the like, and has satisfactory operability, a reduced curing shrinkage, and high adhesive durability. <P>SOLUTION: The cement composition comprises: cement; acrylic copolymerized re-emulsified resin powder; an expanding material; and a shrinkage reducing agent. Regarding the acrylic copolymerized re-emulsified resin powder, the average particle diameter of the primary particles in the resin powder is 0.2 to 0.8 μm, and the surfaces of the primary particles in the resin powder are coated with the water soluble protective colloid of polyvinyl alcohol. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、左官材、屋根材、壁材、防水材などのこて塗り用モルタルや、吹付け用のモルタル、土木構造物の補修や補強に用いる断面修復材、及びグラウト材などに用いることができるセメント組成物、並びにこのセメント組成物と水とを混練して得られるモルタル、及びこのモルタルを用いて断面補修したコンクリート構造体に関する。   This invention is used for plastering mortar such as plastering material, roofing material, wall material, waterproofing material, mortar for spraying, cross-sectional restoration material used for repair and reinforcement of civil engineering structures, grout material, etc. The present invention relates to a cement composition that can be used, a mortar obtained by kneading the cement composition and water, and a concrete structure having a cross-sectional repair using the mortar.

特許文献1にはセメント、砂、再乳化形樹脂粉末、粉末流動化剤、粉末消泡剤を含むことを特徴とする注入用一粉型ポリマーセメントモルタル組成物が開示されており、該ポリマーセメントモルタル組成物はプレミックスタイプで、施工現場でのポリマーの計量、混合をする必要がなく、消泡剤を加えたことで硬化体の強度低下を抑えることができることが開示されている。   Patent Document 1 discloses a one-powder type polymer cement mortar composition for injection characterized by containing cement, sand, re-emulsifying resin powder, powder fluidizing agent, and powder antifoaming agent. It is disclosed that the mortar composition is a premix type, and it is not necessary to weigh and mix the polymer at the construction site, and the strength reduction of the cured product can be suppressed by adding an antifoaming agent.

厚塗り性の良好な断面修復材に関し、特許文献2にはセメント、粉末度5000cm/g以上の粉級フライアッシュ、繊維長3〜20mm、再乳化形樹脂粉末を含むことを特徴とするコンクリート断面修復材が開示され、該断面修復材はプレミックスタイプであり、施工現場でのポリマーの計量、混合をする必要がなく、粉末度5000cm/g以上の分級フライアッシュを加えたことで厚塗り性が向上することが開示されている。 Concerning a cross-section repair material having good coating properties, Patent Document 2 includes cement, powder grade fly ash having a fineness of 5000 cm 2 / g or more, fiber length of 3 to 20 mm, and re-emulsified resin powder. A cross-section restoration material is disclosed, and the cross-section restoration material is a premix type, and it is not necessary to weigh and mix the polymer at the construction site, and the thickness is increased by adding classification fly ash having a fineness of 5000 cm 2 / g or more. It is disclosed that paintability is improved.

ポンプ圧送性向上、温度依存性の低いポリマーセメントモルタルに関し、特許文献3には再乳化形樹脂粉末、ノニオン系粉末分散剤、及びノニオン系消泡剤を含むことを特徴とするポリマーセメントモルタル組成物が開示され、該ポリマーセメントモルタル組成物についてもプレミックスタイプであり、施工現場でのポリマーの計量、混合をする必要がなく、ノニオン系粉末分散剤、消泡剤を加えたことでポリマーセメントモルタルの温度依存性の低減が可能となったことが開示されている。   Patent Document 3 discloses a polymer cement mortar composition comprising a re-emulsifying resin powder, a nonionic powder dispersant, and a nonionic antifoaming agent with respect to a polymer cement mortar having improved pumpability and low temperature dependency. The polymer cement mortar composition is also a premix type, and it is not necessary to weigh and mix the polymer at the construction site. By adding a nonionic powder dispersant and an antifoaming agent, the polymer cement mortar It has been disclosed that the temperature dependency of can be reduced.

特開平7−138062号公報Japanese Patent Laid-Open No. 7-138062 特開2001−322858号公報JP 2001-322858 A 特開2006−44949号公報JP 2006-44949 A

本発明は、左官材、屋根材、壁材、防水材などのこて塗り用モルタルや、吹付け用のモルタル、土木構造物の補修や補強に用いる断面修復材、及びグラウト材などに用いることができ、良好な作業性を有し、硬化収縮量が少なく、かつ高い接着耐久性を有するセメント組成物を提供することを目的とした。   This invention is used for plastering mortar such as plastering material, roofing material, wall material, waterproofing material, mortar for spraying, cross-sectional restoration material used for repair and reinforcement of civil engineering structures, grout material, etc. An object of the present invention is to provide a cement composition having good workability, a small amount of cure shrinkage, and high adhesion durability.

本発明者らは、上記の課題に対して鋭意検討を行い、特定の物質を組み合わせることで、良好な作業性を有し、硬化収縮量が少なく、かつ高い接着耐久性を有するセメント組成物が得られることを見出して本発明を完成した。
即ち、本発明の第一は、
セメント、アクリル共重合再乳化形樹脂粉末、膨張材及び収縮低減剤を含むセメント組成物であって、アクリル共重合再乳化形樹脂粉末は、樹脂粉末の1次粒子の平均粒径が0.2〜0.8μmであり、樹脂粉末の1次粒子表面がポリビニルアルコールの水溶性保護コロイドで被覆されていることを特徴とするセメント組成物である。
さらに本発明の第二は、本発明のセメント組成物と水とを混練して得られるモルタルである。
さらに本発明の第三は、本発明のセメント組成物と水の配合物を硬化させて得られるモルタル硬化物である。好ましくは本発明の第三は、本発明のセメント組成物と水とを混練して得られるモルタルを、硬化させて得られるモルタル硬化物である。
さらに本発明の第四は、本発明のセメント組成物を用いてコンクリート劣化箇所に断面修復を施したコンクリート構造体である。
The present inventors have intensively studied the above problems, and by combining specific substances, a cement composition having good workability, a small amount of cure shrinkage, and high adhesion durability is obtained. The present invention has been completed by finding that it can be obtained.
That is, the first of the present invention is
A cement composition comprising cement, an acrylic copolymerized re-emulsified resin powder, an expansion material, and a shrinkage reducing agent, wherein the acrylic copolymerized re-emulsified resin powder has an average particle size of the primary particles of the resin powder of 0.2. The cement composition is characterized in that the surface of primary particles of the resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol.
The second of the present invention is a mortar obtained by kneading the cement composition of the present invention and water.
The third aspect of the present invention is a mortar cured product obtained by curing the blend of the cement composition of the present invention and water. Preferably, the third aspect of the present invention is a cured mortar obtained by curing a mortar obtained by kneading the cement composition of the present invention and water.
Furthermore, a fourth aspect of the present invention is a concrete structure in which a cross-sectional repair is applied to a concrete deterioration portion using the cement composition of the present invention.

本発明のセメント組成物の好ましい様態を以下に示す。これらは複数組み合わせることができる。
1)アクリル共重合再乳化形樹脂粉末は、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形樹脂粉末であること。
2)アクリル共重合再乳化形樹脂粉末は、カチオン系の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形樹脂粉末であること。
3)セメント組成物は、さらにホルマイト系粘土鉱物を含むこと。
4)セメント組成物は、さらに流動化剤を含むこと。
5)セメント組成物は、さらに細骨材と繊維を含むこと。
6)セメント組成物は、コンクリート構造体表面の劣化部分を除去した箇所のコンクリート断面の修復に用いられること。
Preferred embodiments of the cement composition of the present invention are shown below. A plurality of these can be combined.
1) The acrylic copolymer re-emulsified resin powder is an acrylic ester / methacrylic ester copolymer re-emulsified resin powder.
2) The acrylic copolymer re-emulsified resin powder is a cationic acrylic ester / methacrylic ester copolymer re-emulsified resin powder.
3) The cement composition further contains a holmite clay mineral.
4) The cement composition further contains a fluidizing agent.
5) The cement composition further contains fine aggregates and fibers.
6) The cement composition shall be used to repair the concrete cross section where the deteriorated part of the concrete structure surface is removed.

本発明のセメント組成物は、水と混練して、こて塗りなどの作業性に優れたモルタルを得ることができる。該モルタルの硬化物は、硬化収縮量が少なく、かつ高い接着耐久性(湿潤時、温冷繰り返し試験後)を有している。また、水量を調整することにより、良好な吹付け性を有する吹付け用モルタルを得ることができる。また、一回の吹付け操作により、広範囲かつ大量に厚付け施工が可能であるため、施工効率を大幅に改善することができる。したがって、本発明のセメント組成物は、土木建築構造物の補修や補強に用いる断面修復材用として好適に用いられるとともに、長期の供用に耐えうる優れた耐久性を有するコンクリート構造体を得ることができる。   The cement composition of the present invention can be kneaded with water to obtain a mortar having excellent workability such as trowel coating. The cured product of the mortar has a small amount of cure shrinkage and high adhesion durability (when wet, after repeated heating and cooling tests). Moreover, the mortar for spraying which has favorable sprayability can be obtained by adjusting the amount of water. Further, thickening can be performed in a wide range and in a large amount by one spraying operation, so that the construction efficiency can be greatly improved. Therefore, the cement composition of the present invention can be suitably used as a cross-sectional restoration material used for repair and reinforcement of civil engineering structures, and can obtain a concrete structure having excellent durability that can withstand long-term use. it can.

本発明は、セメント、アクリル共重合再乳化形樹脂粉末、膨張材及び収縮低減剤を含むセメント組成物である。
本発明で用いるセメントとしては、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、白色ポルトランドセメント、中庸熱ポルトランドセメント、耐硫酸塩ポルトランドセメント、低熱ポルトランドセメント、シリカセメント、高炉セメント、フライアッシュセメントなどの各種混合セメント、或いはアルミナセメント、膨張セメントなどの特殊セメントなどの土木建築業界で一般に使用されるものを用いることができ、これらを単独で、又は二種以上の混合物として使用することができる。
The present invention is a cement composition comprising cement, an acrylic copolymer re-emulsifying resin powder, an expansion material and a shrinkage reducing agent.
Examples of the cement used in the present invention include ordinary Portland cement, early strength Portland cement, super early strength Portland cement, white Portland cement, moderately hot Portland cement, sulfate resistant Portland cement, low heat Portland cement, silica cement, blast furnace cement, fly ash. Commonly used in the civil engineering industry, such as various mixed cements such as cement, or special cements such as alumina cement and expanded cement, can be used alone or as a mixture of two or more. it can.

本発明で用いるアクリル共重合再乳化形樹脂粉末について、その製造方法は、特にその種類・プロセスは限定されず、公知の製造方法で製造されたものを用いることができ、また樹脂粉末としては、ブロッキング防止剤を主に樹脂粉末の表面に付着しているものを好適に用いることができる。
樹脂粉末は、水性ポリマーディスパージョンを噴霧やフリーズドライなどの方法で、溶媒を除去し乾燥した再乳化形の樹脂粉末を用いる。
本発明では、樹脂粉末として保護コロイドアクリルエマルジョンから製造されたアクリル供重合系の再乳化形樹脂粉末を用いることができ、特に、保護コロイドアクリルエマルジョンから製造されたアクリル酸エステル/メタクリル酸エステル供重合体の再乳化形樹脂粉末を用いることができる。
About the acrylic copolymer re-emulsification type resin powder used in the present invention, its production method is not particularly limited in kind and process, and those produced by a known production method can be used. What has adhered the antiblocking agent mainly to the surface of the resin powder can be used suitably.
As the resin powder, a re-emulsified resin powder obtained by removing the solvent and drying the aqueous polymer dispersion by a method such as spraying or freeze drying is used.
In the present invention, an acrylic-polymerized re-emulsified resin powder produced from a protective colloid acrylic emulsion can be used as the resin powder, and in particular, an acrylic ester / methacrylic ester provided from a protective colloid acrylic emulsion. A combined re-emulsified resin powder can be used.

アクリル共重合系の再乳化形樹脂粉末の1次粒子(エマルジョン)の平均粒経は、好ましくは0.2〜0.8μmの範囲であり、更に好ましくは0.25〜0.75μmの範囲であり、より好ましくは0.3〜0.7μmの範囲であり、特に好ましくは0.35〜0.65μmの範囲のものを選択して用いることによって、良好な施工性と、緻密なポリマーフィルムの形成によって得られる優れた接着性や耐久性・耐候性とを併せて得られることから好ましい。
1次粒子の平均粒経が前記範囲のアクリル共重合系の再乳化形樹脂粉末を用いたセメント組成物では、土木建築構造物の補修、及び、土木建築構造物の補強などの断面修復材用の断面修復材として使用する場合に、こてを用いたモルタル施工の作業を行う過程で、良好なこて作業性(こて切れ、こて送り、こて伸び、こて離れ)を得ることができる。
樹脂粉末の1次粒径の平均粒径が前記範囲よりも大きい場合、土木建築構造物の補修及び、土木建築構造物の補強に用いる時のモルタルのこて作業性は良好なものの、セメント組成物の硬化体の接着耐久性が低下するため好ましくなく、樹脂粉末の1次粒径の平均粒経が前記範囲よりも小さい場合、接着耐久性は良好なものの、モルタルのこて作業性が悪くなることから好ましくない。
The average particle size of the primary particles (emulsion) of the acrylic copolymer re-emulsified resin powder is preferably in the range of 0.2 to 0.8 μm, more preferably in the range of 0.25 to 0.75 μm. Yes, more preferably in the range of 0.3 to 0.7 μm, particularly preferably by selecting and using one in the range of 0.35 to 0.65 μm, a good workability and a dense polymer film It is preferable because excellent adhesion, durability, and weather resistance obtained by formation can be obtained together.
For cement compositions using acrylic copolymer re-emulsified resin powder with an average primary particle size in the above range, for repairing civil engineering and building structures, and for repairing cross sections such as reinforcing civil engineering and building structures When using as a cross-section restoration material, good trowel workability (trowel cutting, trowel feeding, trowel elongation, trowel separation) can be obtained in the process of mortar construction using a trowel. it can.
When the average particle size of the primary particle size of the resin powder is larger than the above range, the mortar trowel workability when used for repairing civil engineering structures and reinforcing civil engineering structures is good, but the cement composition Adhesive durability of the cured product decreases, which is not preferable, and when the average particle size of the primary particle size of the resin powder is smaller than the above range, although the adhesion durability is good, the trowel workability of the mortar is poor. This is not preferable.

本発明では、アクリル共重合系の再乳化形樹脂粉末100重量%中に再乳化形樹脂粉末の1次粒子が、好ましくは0.1〜1μmの粒子を97質量%以上含み、さらに好ましくは0.15〜0.9μmの粒子を95%以上含み、より好ましくは0.2〜0.8μmの粒子を90質量%以上含み、特に好ましくは0.3〜0.7μmの粒子を75%質量%以上含むものを選択して用いることによって、良好な施工性と、緻密なポリマーフィルムの形成によって得られる優れた接着耐久性や耐久性・耐候性とを併せて得られることから好ましい。
前記範囲の粒径の1次粒子を前記の範囲で含む場合、アクリル共重合系の再乳化形樹脂粉末を用いたセメント組成物では、モルタルのこて作業を行う過程で、良好な作業性を得ることができる。
樹脂粉末の1次粒径の平均粒径が前記範囲よりも大きい場合、モルタルのこて作業性は良好なものの、接着耐久性が低下するため好ましくなく、樹脂粉末の1次粒径の平均粒経が前記範囲よりも小さい場合、接着耐久性は良好なものの、こて作業性が悪くなることから好ましくない。
In the present invention, the primary particles of the re-emulsified resin powder preferably contain 97% by mass or more of 0.1-1 μm particles in 100% by weight of the acrylic copolymer-based re-emulsified resin powder, more preferably 0%. .95% or more of particles of 15 to 0.9 μm, more preferably 90% or more of particles of 0.2 to 0.8 μm, particularly preferably 75% by mass of particles of 0.3 to 0.7 μm By selecting and using the above-mentioned ones, it is preferable because good workability and excellent adhesion durability and durability / weather resistance obtained by forming a dense polymer film can be obtained.
When primary particles having a particle size in the above range are included in the above range, the cement composition using the acrylic copolymer re-emulsified resin powder has good workability in the process of performing the trowel work of the mortar. Obtainable.
When the average particle size of the primary particle size of the resin powder is larger than the above range, the trowel workability of the mortar is good, but it is not preferable because the adhesion durability is lowered, and the average particle size of the primary particle size of the resin powder is not preferable. When the warp is smaller than the above range, the adhesion durability is good, but the trowel workability is deteriorated, which is not preferable.

本発明で用いるアクリル共重合系の再乳化形樹脂粉末は、その1次粒子がポリビニルアルコールの水溶性保護コロイドで被覆されていることが好ましい。
再乳化形樹脂粉末の1次粒子表面が、ポリビニルアルコールの水溶性保護コロイドで被覆されていることによって、再乳化の過程で速やかにかつ均一にもとのエマルジョンの状態(樹脂粉末化前の1次粒子の状態)、すなわち、セメント組成物中に1次粒子が均一に分散した状態を実現することができる。
The acrylic copolymer-based re-emulsified resin powder used in the present invention preferably has a primary particle coated with a water-soluble protective colloid of polyvinyl alcohol.
The surface of the primary particles of the re-emulsified resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol, so that the state of the original emulsion quickly (1 before the resin powder is formed) in the re-emulsification process. Secondary particle state), that is, a state where primary particles are uniformly dispersed in the cement composition.

本発明で用いるアクリル共重合系の再乳化樹脂粉末は、カチオン性、ノニオン性及びアニオン性のものを用いることができ、特に、モルタルとコンクリートとの接着耐久性をより高める効果がより高いことから、カチオン性であることが好ましい。
また、アクリル共重合再乳化形樹脂粉末にアンモニウム塩又は第4級アンモニウム基を導入することにより、カチオン性を付与されたカチオン系のアクリル共重合再乳化形樹脂粉末がより好ましい。
カチオン系のアクリル共重合再乳化形樹脂粉末を用いた場合、カチオンに帯電した荷電ポリマー粒子が、セメント、砂、及び被着体と静電的に引き合って、密着性が向上することにより、モルタルとコンクリートとの接着耐久性がより高まるものと推考される。
The acrylic copolymer-based re-emulsified resin powder used in the present invention can be cationic, nonionic or anionic, and in particular, has a higher effect of further enhancing the durability of adhesion between mortar and concrete. It is preferable that it is cationic.
Further, a cationic acrylic copolymerized re-emulsified resin powder imparted with a cationic property by introducing an ammonium salt or a quaternary ammonium group into the acrylic copolymer re-emulsified resin powder is more preferable.
When a cationic acrylic copolymer re-emulsifying resin powder is used, the charged polymer particles charged to the cation are attracted electrostatically to cement, sand, and the adherend, and the adhesion is improved. It is estimated that the durability of bonding between the concrete and concrete is further increased.

本発明では、前記範囲の1次粒子径を前記範囲で含み、かつ、1次粒子の表面がポリビニルアルコールの水溶性保護コロイドで被覆されたアクリル系共重合系の再乳化形樹脂粉末を用いることによって、モルタルのこて作業を行う過程で良好な作業性、接着耐久性に優れた特性を併せて得ることができる。
本発明では、特に、前記範囲の1次粒子径を前記範囲で含み、かつ、1次粒子の表面がポリビニルアルコールの水溶性保護コロイドで被覆され、さらに、カチオン性であるアクリル系共重合系の再乳化形樹脂粉末を選択することによって、モルタルのこて作業を行う過程での作業性や、接着耐久性にさらに優れた特性を得ることができる。
In the present invention, an acrylic copolymer re-emulsified resin powder containing the primary particle diameter in the above range in the above range and the surface of the primary particle coated with a water-soluble protective colloid of polyvinyl alcohol is used. Thus, it is possible to obtain both excellent workability and excellent adhesion durability in the process of performing a mortar ironing operation.
In the present invention, in particular, an acrylic copolymer having a primary particle diameter in the above range in the above range, the surface of the primary particles being coated with a water-soluble protective colloid of polyvinyl alcohol, and being cationic. By selecting the re-emulsified resin powder, it is possible to obtain characteristics more excellent in workability in the process of performing a mortar trowel work and in adhesion durability.

本発明で用いるアクリル系共重合系の再乳化形樹脂粉末は、噴霧乾燥やフリーズドライなどの方法で1次粒子中の溶媒を除去し乾燥した2次粒子の形態で用いられる。
本発明で用いるアクリル共重合系の再乳化形樹脂粉末の2次粒子の粒子径は、好ましくは20〜100μmの範囲であり、さらに好ましくは30〜90μmの範囲であり、より好ましくは45〜85μmの範囲であり、特に好ましくは50〜80μmの範囲であることが、再乳化形樹脂粉末を含むセメント組成物と水とを混練してモルタルにする過程で、再乳化形樹脂粉末の2次粒子がセメント組成物に含まれている細骨材によって解砕されて容易に再分散し、1次粒子が均一に分散した状態になりやすいことから前記範囲の2次粒子径の再乳化形樹脂粉末を用いることが好ましい。
樹脂粉末の2次粒子の粒子径が前記範囲よりも大きい場合、再乳化形樹脂粉末を含むセメント組成物と水とを混練してモルタルにする過程で、再乳化形樹脂粉末の2次粒子が再分散されにくくなり、1次粒子が均一に分散されにくくなることから好ましくなく、樹脂粉末の2次粒子の粒子径が前記範囲よりも小さい場合、工場においてプレミックスしてセメント組成物を製造する際に、再乳化形樹脂粉末が飛散して作業環境が悪くなるなどのハンドリング性が悪くなることから好ましくない。
The acrylic copolymer-based re-emulsified resin powder used in the present invention is used in the form of secondary particles obtained by removing the solvent from the primary particles by a method such as spray drying or freeze drying.
The particle diameter of the secondary particles of the acrylic copolymer-based re-emulsifying resin powder used in the present invention is preferably in the range of 20 to 100 μm, more preferably in the range of 30 to 90 μm, more preferably 45 to 85 μm. In the process of kneading the cement composition containing the re-emulsifying resin powder and water into a mortar, the secondary particles of the re-emulsifying resin powder are particularly preferably in the range of 50 to 80 μm. Is easily pulverized by the fine aggregate contained in the cement composition and easily redispersed, and the primary particles tend to be uniformly dispersed. Is preferably used.
When the particle diameter of the secondary particles of the resin powder is larger than the above range, the secondary particles of the re-emulsified resin powder are mixed in the mortar by kneading the cement composition containing the re-emulsified resin powder and water. It is not preferable because it is difficult to re-disperse and primary particles are difficult to be uniformly dispersed. When the particle size of the secondary particles of the resin powder is smaller than the above range, a cement composition is manufactured by premixing at a factory. In this case, the re-emulsified resin powder is scattered, which is not preferable because handling properties such as a worse working environment are deteriorated.

本発明で用いる再乳化形樹脂粉末は、セメント100質重量部に対して、好ましくは2〜18質量部、より好ましくは2.5〜14質量部、さらに好ましくは3〜13質量部、特に好ましくは3.5〜12質量部の範囲で配合することによって、良好なこて作業性(こて切れ、こて送り、こて伸び、こて離れ)、接着耐久性に優れた特性を併せて得ることができる。
樹脂粉末の配合割合が、前記範囲よりも大きい場合、再乳化形樹脂粉末を含むセメント組成物と水とを混練してモルタルにする過程で、樹脂粉末による巻き込みエアーが多くなるため硬化体の圧縮強度が低下し、また、こて作業性が悪くなることから好ましくなく、樹脂粉末の配合割合が、前記範囲よりも小さい場合、硬化体の圧縮強度は高くなるものの、接着耐久性が低下するため好ましくない。
The re-emulsifying resin powder used in the present invention is preferably 2 to 18 parts by mass, more preferably 2.5 to 14 parts by mass, still more preferably 3 to 13 parts by mass, particularly preferably 100 parts by mass of cement. Is blended in the range of 3.5 to 12 parts by mass to obtain excellent trowel workability (trowel cutting, trowel feed, trowel elongation, trowel separation) and excellent adhesion durability. be able to.
When the blending ratio of the resin powder is larger than the above range, since the entrainment air by the resin powder increases in the process of kneading the cement composition containing the re-emulsified resin powder and water into a mortar, the cured body is compressed. This is not preferable because the strength decreases and the trowel workability deteriorates. When the blending ratio of the resin powder is smaller than the above range, the compression strength of the cured body increases, but the adhesion durability decreases. It is not preferable.

本発明で用いる膨張材は、金属粉、カルシウムサルフォアルミネート(CSA系)及びCaOを主成分とする石灰系などの膨張材を使用することができ、金属粉、カルシウムサルフォアルミネート系及び石灰系の膨張材から選ばれる2種以上を併用して用いることができる。   As the expansion material used in the present invention, metal powder, calcium sulfoaluminate (CSA system) and lime-based expansion material mainly composed of CaO can be used, such as metal powder, calcium sulfoaluminate system and Two or more selected from lime-based expansion materials can be used in combination.

カルシウムサルフォアルミネート系膨張材としては、アウインを挙げることができ、石灰系膨張材としては、生石灰、生石灰―石膏混合系及び仮焼ドロマイト等が挙げられ、これらの一種又は二種以上の混合物として使用できる。特に石灰系膨張材としては、生石灰及び/又は生石灰―石膏混合系が好ましい。   Examples of the calcium sulfoaluminate-based expanding material include Auin, and examples of the lime-based expanding material include quick lime, quick lime-gypsum mixed system, calcined dolomite, and the like, and one or a mixture of two or more of these. Can be used as In particular, as the lime-based expansion material, quick lime and / or quick lime-gypsum mixed system is preferable.

膨張材の添加量は、本発明の特性を損なわない範囲で添加することができ、セメント100質量部に対し、好ましくは2〜20質量部、より好ましくは2.5〜18質量部、さらに好ましくは3〜16質量部、特にこのましくは4〜15質量部が好ましく、添加量が少ないと膨張性に寄与せず、添加量が多いと過剰膨張するため、好ましくない。   The addition amount of the expansion material can be added within a range that does not impair the characteristics of the present invention, and is preferably 2 to 20 parts by mass, more preferably 2.5 to 18 parts by mass, and further preferably 100 parts by mass of cement. Is preferably from 3 to 16 parts by mass, particularly preferably from 4 to 15 parts by mass. If the addition amount is small, it does not contribute to the expansibility.

本発明で用いる収縮低減剤は、ポリオキシアルキレン誘導体を含むアルキレン類の重合体をエーテル化した有機系収縮低減剤を使用することができる。
収縮低減剤の添加量は、本発明の特性を損なわない範囲で添加することができ、セメント100質量部に対し、好ましくは0.5〜8質量部、より好ましくは0.75〜6質量部、さらに好ましくは1〜5質量部、特に好ましくは1.2〜4質量部の範囲で用いることが好ましく、添加量が前記範囲より少ないと収縮低減への寄与が小さくなり、添加量が前記範囲より多いと強度発現性が低下し、収縮低減効果が頭打ちになると共に、経済的でない。
As the shrinkage reducing agent used in the present invention, an organic shrinkage reducing agent obtained by etherifying an alkylene polymer containing a polyoxyalkylene derivative can be used.
The addition amount of the shrinkage reducing agent can be added within a range not impairing the characteristics of the present invention, and is preferably 0.5 to 8 parts by mass, more preferably 0.75 to 6 parts by mass with respect to 100 parts by mass of cement. Further, it is preferably used in the range of 1 to 5 parts by mass, particularly preferably in the range of 1.2 to 4 parts by mass. When the addition amount is less than the above range, the contribution to shrinkage reduction becomes small and the addition amount is within the above range. If it is more, the strength development is reduced, the shrinkage reduction effect reaches its peak, and it is not economical.

本発明のセメント組成物は、セメント、アクリル共重合再乳化形樹脂粉末、膨張材及び収縮低減剤のほかに、ホルマイト粘土鉱物、流動化剤、細骨材、繊維及び増粘剤を用いることができる。
本発明で用いるホルマイト粘土鉱物は、アタパルジャイト、セピオライト、パリゴルスカイトなどが挙げられ、一種、又は二種以上の混合物として使用できる。
ホルマイト粘土鉱物は、粒状粘土鉱物や繊維状粘土鉱物を用いることができ、特に、アタパルジャイト、セピオライト、パリゴルスカイトなどの繊維状粘土鉱物を好ましく用いることができる。
特に本発明のセメント組成物は、セメント100重量部に対して、好ましくは0.4〜5質量部、より好ましくは0.6〜4.5質量部、さらに好ましくは0.8〜4.2質量部、特に好ましくは1〜4質量部の範囲で配合することによって、良好なこて作業性(こて切れ、こて送り、こて伸び、こて離れ)、塗着性、厚付け性に優れた特性を併せて得ることができる。
The cement composition of the present invention may use holmite clay mineral, fluidizer, fine aggregate, fiber and thickener in addition to cement, acrylic copolymer re-emulsifying resin powder, expansion material and shrinkage reducing agent. it can.
The holmite clay mineral used in the present invention includes attapulgite, sepiolite, palygorskite, and the like, and can be used as one kind or a mixture of two or more kinds.
As the holmite clay mineral, a granular clay mineral or a fibrous clay mineral can be used, and in particular, a fibrous clay mineral such as attapulgite, sepiolite, or palygorskite can be preferably used.
In particular, the cement composition of the present invention is preferably 0.4 to 5 parts by mass, more preferably 0.6 to 4.5 parts by mass, and still more preferably 0.8 to 4.2 parts per 100 parts by mass of cement. By blending in parts by mass, particularly preferably in the range of 1 to 4 parts by mass, good trowel workability (trowel cutting, trowel feed, trowel elongation, trowel separation), coatability, thickening properties Excellent characteristics can be obtained together.

本発明で用いる流動化剤は、減水効果、好適な流動性を併せ持つ、メラミンスルホン酸のホルムアルデヒド縮合物、カゼイン、カゼインカルシウム、ポリカルボン酸系、ポリエーテル系、ポリエーテルカルボン酸などの市販の流動化剤が使用でき、特にポリエーテル系、ポリエーテルカルボン酸などの市販の流動化剤が好ましい。
流動化剤は、使用する水硬性成分に応じて、特性を損なわない範囲で使用でき、セメント100重量部に対して、好ましくは0.02〜0.40質量部、より好ましくは0.03〜0.30質量部、さらに好ましくは0.04〜0.25質量部、特に好ましくは0.06〜0.20質量部の範囲で配合することができる。添加量が少ないと優れた流動性が発現せず、また添加量が多すぎても強度発現性に悪影響を与えるだけでなく、経済的でない。
The fluidizing agent used in the present invention is a commercially available fluid such as a formaldehyde condensate of melamine sulfonic acid, casein, calcium caseinate, polycarboxylic acid, polyether, polyether carboxylic acid, which has a water reducing effect and suitable fluidity. A commercially available fluidizing agent such as polyether-based or polyether carboxylic acid is particularly preferable.
The fluidizing agent can be used within a range that does not impair the properties depending on the hydraulic component used, and is preferably 0.02 to 0.40 parts by mass, more preferably 0.03 to 100 parts by weight of cement. 0.30 mass part, More preferably, it is 0.04-0.25 mass part, Most preferably, it can mix | blend in the range of 0.06-0.20 mass part. If the addition amount is small, excellent fluidity will not be exhibited, and if the addition amount is too large, not only will the strength development be adversely affected, but it is also not economical.

細骨材としては、珪砂、川砂、海砂、シリカ粉、FCC触媒などの各種無機系触媒の廃材、寒水石、石灰類などが挙げられ、一種または二種以上の混合物として使用でき、2mm以下の径の珪砂、川砂、海砂、シリカ粉、FCC触媒などの各種無機系触媒の廃材、寒水石、石灰類などを用いることが好ましい。
2mm以下の径の細骨材を用いることにより、良好なこて作業性(こて切れ、こて送り、こて伸び、こて離れ)や吹付け性が向上するために好ましく用いることができる。
Examples of fine aggregates include silica sand, river sand, sea sand, silica powder, waste materials of various inorganic catalysts such as FCC catalysts, cryolite, limes, etc., which can be used as one kind or a mixture of two or more kinds, 2 mm or less It is preferable to use various types of inorganic catalyst waste materials such as silica sand, river sand, sea sand, silica powder, FCC catalyst, chlorite, and lime.
By using a fine aggregate having a diameter of 2 mm or less, good trowel workability (trowel cutting, trowel feeding, trowel elongation, trowel separation) and sprayability can be preferably used.

細骨材は、本発明の特性を損なわない範囲で添加することができ、セメント100質量部に対して、好ましくは0〜200質量部、より好ましくは20〜180質量部、さらに好ましくは40〜170質量部、特に好ましくは60〜160質量部が流動性や硬化体強度発現性などのために好ましい。   The fine aggregate can be added within a range that does not impair the properties of the present invention, and is preferably 0 to 200 parts by weight, more preferably 20 to 180 parts by weight, and still more preferably 40 to 100 parts by weight of cement. 170 parts by mass, particularly preferably 60 to 160 parts by mass is preferred for fluidity and hardened body strength.

本発明では、クラック防止、こて作業性向上のために繊維を用いることができる。
本発明で用いる繊維は、耐アルカリガラス繊維、炭素繊維、ビニロン繊維、ポリエチレン繊維、ポリプロピレン繊維などを用いることができ、これらは一種、又は二種以上の混合物として使用できる。
繊維は、建材用を用いることが好ましく、繊維長さは0.5〜15mm程度のものを用いることが好ましい。
本発明のセメント組成物において、クラック防止及びこて作業性向上効果を高めるために、セメント100質量部に対し、好ましくは0.01〜2質量部、より好ましくは0.03〜1.5質量部、さらに好ましくは0.05〜1.2質量部、特に好ましくは0.08〜1質量部が好ましい。添加量が少ないとひび割れ防止に寄与せず、また添加量が多すぎても混練性、施工性が低下するため、好ましくない。
In the present invention, fibers can be used for preventing cracks and improving trowel workability.
As the fiber used in the present invention, alkali-resistant glass fiber, carbon fiber, vinylon fiber, polyethylene fiber, polypropylene fiber and the like can be used, and these can be used as one kind or a mixture of two or more kinds.
The fiber is preferably used for building materials, and the fiber length is preferably about 0.5 to 15 mm.
In the cement composition of the present invention, in order to enhance crack prevention and trowel workability improvement effects, the amount is preferably 0.01 to 2 parts by mass, more preferably 0.03 to 1.5 parts by mass with respect to 100 parts by mass of cement. Parts, more preferably 0.05 to 1.2 parts by mass, particularly preferably 0.08 to 1 part by mass. If the addition amount is small, it does not contribute to prevention of cracks, and if the addition amount is too large, kneadability and workability deteriorate, which is not preferable.

本発明では、厚付け性を向上させるために増粘剤を用いることができる。
本発明で用いる増粘剤は、ヒドロキシメチルセルロースを含むセルロース系、ラテックス系、及び水溶性ポリマー系などの増粘剤を併用して使用することができる。
増粘剤の添加量は、本発明の特性を損なわない範囲で添加することができ、セメント100質量部に対し、好ましくは0.001〜2質量部、より好ましくは0.005〜1.5質量部、さらに好ましくは0.0075〜1質量部、特に好ましくは0.01〜0.8質量部含むことが好ましい。添加量が多くなると、モルタル粘度が増加して流動性の低下をするため、好ましくない。
In the present invention, a thickener can be used to improve the thickness.
The thickener used in the present invention can be used in combination with thickeners such as cellulose-based, latex-based, and water-soluble polymer-based compounds containing hydroxymethylcellulose.
The addition amount of the thickener can be added within a range that does not impair the characteristics of the present invention, and is preferably 0.001 to 2 parts by mass, more preferably 0.005 to 1.5 parts per 100 parts by mass of cement. It is preferable to contain part by mass, more preferably 0.0075 to 1 part by mass, particularly preferably 0.01 to 0.8 part by mass. When the addition amount is increased, the mortar viscosity is increased and the fluidity is lowered.

本発明では、セメント及びアクリル共重合系の再乳化型樹脂粉末と、膨張材、収縮低減材、ホルマイト粘土鉱物、流動化剤、細骨材、繊維及び増粘剤などを混合機で混合して、セメント組成物のプレミックス粉体を得ることができる。 In the present invention, a re-emulsification type resin powder of cement and acrylic copolymer, and an expansion material, a shrinkage reducing material, a holmite clay mineral, a fluidizing agent, a fine aggregate, a fiber and a thickener are mixed with a mixer. A premix powder of the cement composition can be obtained.

セメント組成物のプレミックス粉体は、所定量の水と混合、攪拌して、水硬性スラリー又は水硬性モルタルを製造することができ、その水硬性スラリー又は水硬性モルタルを硬化させてモルタル硬化物を得ることができる。   The premix powder of the cement composition can be mixed with a predetermined amount of water and stirred to produce a hydraulic slurry or hydraulic mortar. The hydraulic slurry or hydraulic mortar is cured to harden the mortar. Can be obtained.

本発明のセメント組成物は、用途に応じて、水の配合量を適宜選択することにより、フローを調整して用いることができる。
本発明のセメント組成物は、水と配合し、混練することにより、水硬性スラリー又は水硬性モルタルとして用いることができる。
本発明のセメント組成物は、水と配合して、コテ塗り用や吹付け用に優れたスラリーやモルタルを得ることができる。
本発明のセメント組成物において、水の配合量は、セメント100質量部に対し、好ましくは10〜100質量部、よりに好ましくは15〜90質量部、さらに好ましくは20〜80質量部、特に好ましくは30〜70質量部を加えて用いることが好ましい。
The cement composition of the present invention can be used by adjusting the flow by appropriately selecting the blending amount of water according to the application.
The cement composition of the present invention can be used as a hydraulic slurry or hydraulic mortar by blending with water and kneading.
The cement composition of the present invention can be blended with water to obtain an excellent slurry or mortar for trowel coating or spraying.
In the cement composition of the present invention, the amount of water is preferably 10 to 100 parts by weight, more preferably 15 to 90 parts by weight, still more preferably 20 to 80 parts by weight, particularly preferably 100 parts by weight of cement. Is preferably used after adding 30 to 70 parts by mass.

本発明のセメント組成物において、特にコテ塗り用として用いる場合、水の配合量は、セメント100質量部に対し、好ましくは、10〜100質量部、より好ましくは31〜60質量部、さらに好ましくは32〜55質量部、特に好ましくは33〜50質量部を加えて用いることが好ましい。10質量部未満では配合時の混練抵抗が増し、またコテ塗り作業性が低下するため適当でない。また、100質量部を超えると強度発現性が低下し、また施工時の厚付け性も困難になるため適当でない。   In the cement composition of the present invention, particularly when used for ironing, the amount of water is preferably 10 to 100 parts by weight, more preferably 31 to 60 parts by weight, and still more preferably 100 parts by weight of cement. It is preferable to add 32 to 55 parts by mass, particularly preferably 33 to 50 parts by mass. If it is less than 10 parts by mass, the kneading resistance at the time of blending is increased, and the troweling workability is lowered. On the other hand, when the amount exceeds 100 parts by mass, the strength development is lowered and the thickness is difficult to apply at the time of construction.

本発明のセメント組成物は、特に吹付け用として用いる場合、水の配合量は、セメント100質量部に対し、好ましくは、10〜100質量部、より好ましくは36〜65質量部、さらに好ましくは37〜60質量部、特に好ましくは38〜55質量部を加えて用いることが好ましい。10質量部未満では配合時の混練抵抗が増し、また圧送性が低下するため適当でない。また、100質量部を超えると強度発現性が低下し、また吹付け時の厚付け性も低下するため適当でない。   When the cement composition of the present invention is used particularly for spraying, the amount of water is preferably 10 to 100 parts by weight, more preferably 36 to 65 parts by weight, and still more preferably 100 parts by weight of cement. It is preferable to add 37 to 60 parts by mass, particularly preferably 38 to 55 parts by mass. If it is less than 10 parts by mass, the kneading resistance at the time of blending is increased and the pumpability is lowered, so that it is not suitable. On the other hand, when the amount exceeds 100 parts by mass, the strength development property is lowered and the thickening property at the time of spraying is also lowered, which is not suitable.

本発明のセメント組成物は、水量を調整することにより、吹付け用のモルタルとして好適に用いることができる。
本発明のセメント組成物は、水と配合し、混練することにより、吹付け時の吐出において脈動を起こしにくく、良好な吹付け作業性を有するモルタルが得られる。さらに、モルタルを吹付け施工することによって、均一に厚付けすることができ、吹付け後のモルタルはダレやブリージングが起こらない。
The cement composition of the present invention can be suitably used as a mortar for spraying by adjusting the amount of water.
When the cement composition of the present invention is blended with water and kneaded, pulsation is unlikely to occur during discharge during spraying, and a mortar having good spraying workability can be obtained. Furthermore, by spraying the mortar, it can be thickened uniformly, and the mortar after spraying does not sag or breath.

本発明のセメント組成物に使用されるモルタルポンプは、特に限定されるものではなく、現在一般に使用されているモルタルポンプを適宜選択して用いることができる。特に、ホース内のモルタルの詰まりも少なく、均一な仕上がりが得られるスクイズ式モルタルポンプやスネーク式モルタルポンプを好適に用いることができる。   The mortar pump used in the cement composition of the present invention is not particularly limited, and a mortar pump currently generally used can be appropriately selected and used. In particular, a squeeze-type mortar pump or a snake-type mortar pump that can obtain a uniform finish with less clogging of the mortar in the hose can be suitably used.

本発明のセメント組成物に使用される吹付けガンは、特に限定されるものではなく、現在一般に使用されている建築用吹付けガンを、適宜選択して用いることができる。特に、均一に厚付けが可能なスプレーガンやリングガンを好適に用いることができる。   The spray gun used in the cement composition of the present invention is not particularly limited, and any currently used spray gun for construction can be appropriately selected and used. In particular, a spray gun or a ring gun that can be uniformly thickened can be suitably used.

本発明のセメント組成物を用いて調製したモルタルを、壁面の一ヶ所約10cmの円形状に吹付けガンを用いて吹付けた場合、一回の吹付け操作により、好ましくは、50〜200mm、より好ましくは、60〜180mm、さらに好ましくは、70〜160mm、特に好ましくは、80〜150mmの厚さに吹付けることができる。200mmを超えると剥落の可能性が高まるため適当でない。   When the mortar prepared using the cement composition of the present invention is sprayed into a circular shape of about 10 cm on a wall surface using a spray gun, it is preferably 50 to 200 mm by a single spraying operation. More preferably, it can spray to the thickness of 60-180 mm, More preferably, it is 70-160 mm, Most preferably, it is 80-150 mm. If it exceeds 200 mm, the possibility of peeling increases, which is not appropriate.

本発明では、本発明のセメント組成物を用いて調製したモルタルを吹付けた一層目の上に、更に吹付け処理を行って多層の吹付けモルタル層を形成することができる。多層の吹付けモルタルの厚さは、好ましくは、50〜250mm、より好ましくは、70〜230mm、更に好ましくは、85〜210mm、特に好ましくは、100〜200mmの範囲に好ましく吹付けることができる。250mmを超えると剥落の可能性が高まるため適当でない。   In the present invention, a multilayer sprayed mortar layer can be formed by further spraying on the first layer sprayed with the mortar prepared using the cement composition of the present invention. The thickness of the multilayer sprayed mortar is preferably 50 to 250 mm, more preferably 70 to 230 mm, still more preferably 85 to 210 mm, and particularly preferably 100 to 200 mm. If it exceeds 250 mm, the possibility of peeling increases, which is not suitable.

本発明のセメント組成物は、左官材、屋根材、床材、壁材、防水材などのこて塗り用のモルタルや吹付け用のモルタル、土木構造物の補修や補強に用いる断面修復材やグラウト材などとして土木、建築、建設分野に好適に使用することができる。   The cement composition of the present invention is a mortar for troweling such as plastering material, roofing material, flooring material, wall material, waterproofing material, mortar for spraying, cross-sectional restoration material used for repair and reinforcement of civil engineering structures, It can be suitably used in the civil engineering, construction and construction fields as a grout material.

以下、本発明について実施例に基づいて詳細に説明する。但し、本発明は下記の実施例により制限されるものでない。   Hereinafter, the present invention will be described in detail based on examples. However, the present invention is not limited by the following examples.

(こて塗り作業性の評価)
モルタルをステンレス製こてでラスカット面に約3〜20mm程度の厚みで塗り付け、こて塗り作業性時のモルタルの切れ、送り、伸び、離れ、塗着性の5項目について評価を行う。
1)切れ(こて残り)の評価:5:大変良好、4:良好、3:普通、2:やや不良、1:不良の5段階で行う。
2)送り(重さ)の評価:5:大変良好、4:良好、3:普通、2:やや不良、1:不良の5段階で行う。
3)伸び(塗り面積)の評価:5:大変良好、4:良好、3:普通、2:やや不良、1:不良の5段階で行う。
4)離れ(ベタツキ)の評価:5:大変良好、4:良好、3:普通、2:やや不良、1:不良の5段階で行う。
5)塗着性(塗り厚性)の評価:5:大変良好、4:良好、3:普通、2:やや不良、1:不良の5段階で行う。
(Evaluation of troweling workability)
The mortar is applied to the lath-cut surface with a stainless steel trowel with a thickness of about 3 to 20 mm, and evaluation is made on five items of mortar cutting, feeding, elongation, separation, and coating property during troweling workability.
1) Evaluation of cutting (trowel remaining): 5: Very good, 4: Good, 3: Normal, 2: Slightly bad, 1: Bad.
2) Feed (weight) evaluation: 5: Very good, 4: Good, 3: Normal, 2: Slightly defective, 1: Defective.
3) Evaluation of elongation (coating area): 5: Very good, 4: Good, 3: Normal, 2: Slightly bad, 1: Bad.
4) Evaluation of separation (stickiness): 5: very good, 4: good, 3: normal, 2: slightly bad, 1: bad.
5) Evaluation of coatability (coating thickness): 5: very good, 4: good, 3: normal, 2: slightly poor, 1: poor.

(モルタルの評価)
JIS R 5201に準拠して測定する。練り混ぜたモルタルを、乾燥した布でよくぬぐったフローテーブル上に中央の位置に正しく置いたフローコーンに2層に詰める。各層は突き棒の先端がその層の約1/2の深さまで入るよう、全面にわたって各々15回突き、最後に不足分を補い表面をならす。直ちにフローコーンを正しく上の方に取り去り、15秒間に15回の落下運動を与え、モルタルが広がった後の径を最大と認める方向と、これに直角な方向とで測定し、その平均値をmm単位とする無名数の整数で表す。
評価条件は、温度20±2℃、湿度65±5%の環境下で行う。
(Evaluation of mortar)
Measured according to JIS R 5201. The kneaded mortar is packed in two layers on a flow cone that is placed in a central position on a flow table well wiped with a dry cloth. Each layer is struck 15 times over the entire surface so that the tip of the stake bar is about half the depth of the layer, and finally the surface is made up of the shortage. Immediately remove the flow cone upwards, give 15 falling motions in 15 seconds, measure in the direction where the diameter after spreading the mortar is the maximum and the direction perpendicular to this, and calculate the average value. Expressed as an unnamed integer in mm.
The evaluation conditions are an environment with a temperature of 20 ± 2 ° C. and a humidity of 65 ± 5%.

(モルタル硬化物の評価)
混練したモルタルを硬化させ、硬化体物性を測定した。
接着強度試験(湿潤接着、温冷繰り返し)については、下地板にJIS規格モルタル板を使用して、東日本、中日本、西日本高速道路株式会社日本道路公団規格JHS-416-2004(断面修復材料品質規格試験方法)に準拠して成型、養生、強度試験を行った。
長さ変化試験については、東日本、中日本、西日本高速道路株式会社日本道路公団規格JHS-416-2004(断面修復材料品質規格試験方法)に準拠して成型、養生、長さ変化試験を行った。
(Evaluation of cured mortar)
The kneaded mortar was cured, and the physical properties of the cured product were measured.
For the adhesive strength test (wet adhesion, repeated heating and cooling), JIS standard mortar board was used for the base plate, East Japan, Central Japan, West Japan Expressway Co., Ltd. Japan Highway Public Corporation Standard JHS-416-2004 (section repair material quality Molding, curing, and strength tests were performed in accordance with the standard test method.
For the length change test, molding, curing, and length change tests were conducted in accordance with East Japan, Central Japan, West Japan Expressway Co., Ltd. Japan Highway Public Corporation Standard JHS-416-2004 (section repair material quality standard test method). .

(吹付け性の評価)
混練したモルタルをホッパーへ落とし、ポンプで圧送した。
吹付け性の評価については、圧送性試験、図1に示す天井面に設置したPC版(200×1090×2680mm)への天井面厚付け性試験、(東日本、中日本、西日本高速道路株式会社日本道路公団規格JHS-432:2006(断面修復用吹付けモルタルの試験方法)に準拠した振動試験を行った。振動試験は、変位振幅が0.5±0.1mmで制御できる性能を有している振動負荷を与える試験機に大きさが(200×1200×2450mm)の試験体に全振幅0.5mm、振動周波数5Hzを与えた状況下で、表6に示すミキサー、スクイズポンプ、コンプレッサー、ノズル、圧送ホースを使用し、下側より上向きに吹付けを行った。振動負荷は仕上げ終了後より24時間連続して行った。
(Evaluation of sprayability)
The kneaded mortar was dropped into a hopper and pumped with a pump.
For the evaluation of sprayability, the pumpability test, the ceiling surface thickness test to the PC version (200 × 1090 × 2680 mm) installed on the ceiling surface shown in FIG. 1, (East Japan, Central Japan, West Japan Expressway Co., Ltd.) A vibration test in accordance with Japan Highway Public Corporation Standard JHS-432: 2006 (Testing method for spraying mortar for cross-sectional repair) was performed, and the vibration test has a performance that can be controlled with a displacement amplitude of 0.5 ± 0.1 mm. In a situation where a test machine having a size (200 × 1200 × 2450 mm) is given a total amplitude of 0.5 mm and a vibration frequency of 5 Hz, a mixer, squeeze pump, compressor, The nozzle and the pressure hose were used for spraying upward from the lower side, and the vibration load was continuously applied for 24 hours after finishing.

原料は以下のものを使用した。
1)セメント:ポルトランドセメント(普通ポルトランドセメント、宇部三菱セメント社製)。
2)再乳化形樹脂粉末:
・樹脂A:アクリル酸エステル/メタクリル酸エステル共重合体、1次粒子がポリビニアルコールの水溶性保護コロイドで被覆された再乳化形樹脂粉末、カチオンタイプ、ニチゴー・モビニール社製、LDM7100P。
・樹脂B:アクリル酸エステル/メタクリル酸エステル共重合体、1次粒子がポリビニルアルコールの水溶性保護コロイドで被覆された再乳化形樹脂粉末、ノニオンタイプ、ニチゴー・モビニール社製、LDM7000P。
・樹脂C:エチレン/酢酸ビニル共重合体、再乳化形樹脂粉末、日本化成社製、LL5055。
・樹脂D:酢酸ビニル/バーサチック酸ビニルエステル共重合体、再乳化形樹脂粉末、ニチゴー・モビニール社製、DM200。
3)ホルマイト系粘土鉱物:アタパルジャイト、ユニオン化成社製。
4)流動化剤 :ポリカル系流動化剤、日本油脂社製。
5)骨材 :細骨材(5号珪砂、6号珪砂、寒水石)
6)繊維 :ビニロン繊維(クラレ社製、長さ6mm)
7)増粘剤 :セルロース系増粘剤、信越化学社製。
8)収縮低減剤 :ポリエーテル系収縮低減剤、日本油脂社製。
9)膨張材 :カルシウムサルフォアルミネート(CSA系)膨張材、太平洋マテリアル社製。
The following materials were used.
1) Cement: Portland cement (ordinary Portland cement, manufactured by Ube Mitsubishi Cement).
2) Re-emulsifying resin powder:
Resin A: Acrylic ester / methacrylic ester copolymer, re-emulsified resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol, a cation type, manufactured by Nichigo Mobile, LDM7100P.
Resin B: Acrylic acid ester / methacrylic acid ester copolymer, re-emulsified resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol, nonionic type, manufactured by Nichigo Movinyl Co., Ltd., LDM7000P.
Resin C: Ethylene / vinyl acetate copolymer, re-emulsified resin powder, manufactured by Nippon Kasei Co., Ltd., LL5055.
Resin D: Vinyl acetate / vinyl versatic acid ester copolymer, re-emulsified resin powder, DM200, manufactured by Nichigo Movinyl.
3) Holmite clay mineral: attapulgite, manufactured by Union Kasei Co., Ltd.
4) Fluidizing agent: Poly-based fluidizing agent, manufactured by NOF Corporation.
5) Aggregate: Fine aggregate (No. 5 silica sand, No. 6 silica sand, cold water stone)
6) Fiber: Vinylon fiber (manufactured by Kuraray Co., Ltd., length 6 mm)
7) Thickener: Cellulosic thickener, manufactured by Shin-Etsu Chemical Co., Ltd.
8) Shrinkage reducing agent: polyether shrinkage reducing agent, manufactured by NOF Corporation.
9) Expanding material: Calcium sulfoaluminate (CSA-based) expanding material, manufactured by Taiheiyo Materials Co., Ltd.

[実施例1〜5、比較例1〜5]
温度20℃、相対湿度65%の条件化で、セメント組成物に、表1に示す配合量の水を加え、3分間ホバートミキサーにて混練を行ってモルタルを調製した。得られたモルタルを用いて、こて塗り作業性の評価を行った結果を表2に示す。また、モルタル硬化物の長さ変化試験および接着強度試験の評価を行った結果を表3及び表4に示す。
[Examples 1-5, Comparative Examples 1-5]
Mortar was prepared by adding water in the amount shown in Table 1 to the cement composition under conditions of a temperature of 20 ° C. and a relative humidity of 65%, and kneading with a Hobart mixer for 3 minutes. Table 2 shows the results of evaluation of troweling workability using the obtained mortar. Tables 3 and 4 show the results of the evaluation of the length change test and the adhesive strength test of the cured mortar.

[実施例6〜10]
セメント組成物に、表5に示す配合量の水を加え、3分間ミキサーにて混練を行い、モルタルを調整した。更に、表5の実施例7を用いて、表6に示す吹付け機材を使用して吹付け性の評価を行った。吹付け性の評価として、圧送性試験、図1に示す天井面に設置したPC版(200×1090×2680mm)への天井面厚付け性試験、東日本、中日本、西日本高速道路株式会社日本道路公団規格JHS-432:2006(断面修復用吹付けモルタルの試験方法)に準拠した振動試験を行った。圧送性試験、図1に示す天井面に設置したPC版(200×1090×2680mm)への天井面厚付け性試験、JHS-432:2006(断面修復用吹付けモルタルの試験方法)に準拠した振動試験の結果を表6に示す。また、実施例10については、吹付け後28日まで現場養生を行った後、直径75mm×高さ150mmの円柱供試体を5本採取し、引張接着性試験を行った。
[Examples 6 to 10]
The amount of water shown in Table 5 was added to the cement composition, and the mixture was kneaded for 3 minutes to adjust the mortar. Furthermore, sprayability was evaluated using the spraying equipment shown in Table 6 using Example 7 in Table 5. As an evaluation of sprayability, a pumpability test, a ceiling surface thickness test on a PC plate (200 × 1090 × 2680 mm) installed on the ceiling surface shown in FIG. 1, East Japan, Central Japan, West Japan Expressway Japan Road A vibration test in accordance with the public corporation standard JHS-432: 2006 (test method for spraying mortar for cross-sectional repair) was conducted. Compliant with the pumpability test, the ceiling surface thickness test on the PC plate (200 × 1090 × 2680 mm) installed on the ceiling surface shown in FIG. 1, and JHS-432: 2006 (test method for spraying mortar for cross-sectional repair) Table 6 shows the results of the vibration test. Moreover, about Example 10, after performing on-site curing to 28th after spraying, five cylindrical test bodies of diameter 75mm x height 150mm were extract | collected, and the tensile adhesiveness test was done.

(1)樹脂成分としてエチレン/酢酸ビニル共重合体の樹脂粉末を使用した比較例3、及び樹脂粉として酢酸ビニル/バーサチック酸ビニルエステル共重合体の樹脂粉末を使用した比較例4、いずれも良好なこて塗り作業性が得られなかった。
(2)樹脂成分としてアクリル酸エステル/メタクリル酸エステル共重合体で1次粒子がポリビニルアルコールの水溶性保護コロイドで被覆された再乳化形樹脂粉末を使用した実施例1、実施例2いずれも良好なこて塗り作業性を得ることができた。
(3)収縮低減剤を使用しなかった比較例2、膨張材を使用しなかった比較例3いずれも、長さ変化率が実施例1、実施例2と比較して劣っていた。
(4)樹脂成分としてエチレン/酢酸ビニル共重合体の樹脂粉末を使用した比較例3、及び樹脂粉として酢酸ビニル/バーサチック酸ビニルエステル共重合体の樹脂粉末を使用した比較例4いずれも温冷繰り返し接着強度において、実施例1、実施例2と比較して小さかった。特に、樹脂成分量を2倍に増やした実施例3、実施例4と比較例5との接着強度の差はより顕著であった。
(5)樹脂成分としてアクリル酸エステル/メタクリル酸エステル共重合体で1次粒子がポリビニルアルコールの水溶性保護コロイドで被覆された再乳化形樹脂粉末を使用した実施例6及び実施例7のセメント組成物を用いることによって、実施例8、実施例9及び実施例10に示すように、良好な圧送性と、天井面への厚付け性とが得られた。
(1) Comparative Example 3 using an ethylene / vinyl acetate copolymer resin powder as the resin component and Comparative Example 4 using a vinyl acetate / versaic acid vinyl ester copolymer resin powder as the resin powder are all good. No troweling workability was obtained.
(2) Both Example 1 and Example 2 using a re-emulsified resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol with an acrylic ester / methacrylic ester copolymer as a resin component are good. The trowel coating workability was obtained.
(3) In Comparative Example 2 in which no shrinkage reducing agent was used and in Comparative Example 3 in which no expansion material was used, the length change rate was inferior to that of Example 1 and Example 2.
(4) Comparative Example 3 using ethylene / vinyl acetate copolymer resin powder as the resin component and Comparative Example 4 using vinyl acetate / versaic acid vinyl ester copolymer resin powder as the resin powder The repeated adhesive strength was small as compared with Example 1 and Example 2. In particular, the difference in adhesive strength between Example 3, Example 4 and Comparative Example 5 in which the resin component amount was doubled was more remarkable.
(5) Cement composition of Example 6 and Example 7 using re-emulsified resin powder in which primary particles are coated with water-soluble protective colloid of polyvinyl alcohol with acrylic ester / methacrylic ester copolymer as resin component By using a thing, as shown in Example 8, Example 9, and Example 10, the favorable pumpability and the thickness to a ceiling surface were obtained.

天井面に設置したPC版への天井面厚付け性試験の概要を模式的に示す図である。It is a figure which shows typically the outline | summary of the ceiling surface thickness property test to the PC version installed in the ceiling surface.

Claims (11)

セメント、アクリル共重合再乳化形樹脂粉末、膨張材及び収縮低減剤を含むセメント組成物であって、アクリル共重合再乳化形樹脂粉末は、樹脂粉末の1次粒子の平均粒径が0.2〜0.8μmであり、樹脂粉末の1次粒子表面がポリビニルアルコールの水溶性保護コロイドで被覆されていることを特徴とするセメント組成物。 A cement composition comprising cement, an acrylic copolymerized re-emulsified resin powder, an expansion material, and a shrinkage reducing agent, wherein the acrylic copolymerized re-emulsified resin powder has an average particle size of the primary particles of the resin powder of 0.2. A cement composition characterized in that the primary particle surface of the resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol. アクリル共重合再乳化形樹脂粉末は、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形樹脂粉末であることを特徴とする請求項1に記載のセメント組成物。 The cement composition according to claim 1, wherein the acrylic copolymer re-emulsification type resin powder is an acrylic ester / methacrylic ester copolymer re-emulsification type resin powder. アクリル共重合再乳化形樹脂粉末は、カチオン系の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形樹脂粉末であることを特徴とする請求項1又は請求項2に記載のセメント組成物。 The cement composition according to claim 1 or 2, wherein the acrylic copolymer re-emulsification type resin powder is a cationic acrylic ester / methacrylic ester copolymer re-emulsification type resin powder. セメント組成物は、さらにホルマイト粘土鉱物を含むことを特徴とする請求項1〜3のいずれか1項に記載のセメント組成物。   The cement composition according to any one of claims 1 to 3, wherein the cement composition further contains a holmite clay mineral. セメント組成物は、さらに流動化剤を含むことを特徴とする請求項1〜4のいずれか1項に記載のセメント組成物。   The cement composition according to any one of claims 1 to 4, wherein the cement composition further comprises a fluidizing agent. セメント組成物は、さらに細骨材と繊維とを含むことを特徴とする請求項1〜5のいずれか1項に記載のセメント組成物。   The cement composition according to any one of claims 1 to 5, wherein the cement composition further contains fine aggregates and fibers. セメント組成物は、劣化したコンクリートを除去した後に断面を修復するコンクリート断面の修復に用いられることを特徴とする請求項1〜6のいずれか1項に記載のセメント組成物。   The cement composition according to any one of claims 1 to 6, wherein the cement composition is used for repairing a concrete section in which the section is repaired after removing deteriorated concrete. 請求項1〜7のいずれか1項に記載のセメント組成物と水とを混練して得られるモルタル。 A mortar obtained by kneading the cement composition according to any one of claims 1 to 7 and water. 請求項1〜7のいずれか1項に記載のセメント組成物と水とを混練して得られるモルタルを、硬化させて得られるモルタル硬化物。 A mortar cured product obtained by curing a mortar obtained by kneading the cement composition according to any one of claims 1 to 7 and water. 請求項1〜7のいずれか1項に記載のセメント組成物と水とを混練して得られるモルタルを用いてコンクリート劣化箇所に断面修復を施したコンクリート構造体。 The concrete structure which gave cross-sectional repair to the concrete deterioration location using the mortar obtained by knead | mixing the cement composition and water of any one of Claims 1-7. 請求項1〜7のいずれか1項に記載のセメント組成物と水とを混練して得られるモルタルを用いてコンクリート劣化箇所に湿式吹付け工法により断面修復を施したコンクリート構造体。   A concrete structure in which a section of a concrete deterioration portion is repaired by a wet spraying method using a mortar obtained by kneading the cement composition according to any one of claims 1 to 7 and water.
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