JP5792056B2 - Mortar - Google Patents

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JP5792056B2
JP5792056B2 JP2011290152A JP2011290152A JP5792056B2 JP 5792056 B2 JP5792056 B2 JP 5792056B2 JP 2011290152 A JP2011290152 A JP 2011290152A JP 2011290152 A JP2011290152 A JP 2011290152A JP 5792056 B2 JP5792056 B2 JP 5792056B2
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佐伯 俊之
俊之 佐伯
佐伯 隆之
隆之 佐伯
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太平洋マテリアル株式会社
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本発明は、コンクリート構造物の下地調整材等として用いられる塗りモルタルに関する。   The present invention relates to a coating mortar that is used as an undercoat conditioning material for a concrete structure.
建築構造物の仕上げは、施工箇所に応じさまざまな仕上げが施される。外壁はタイル張り、仕上塗料が施工され、屋上は塗膜防水、アスファルト防水等の防水工事が実施される。また、屋内はクロス張り、フローリング、エントランス部床の石張りなどが実施される。これらの工事を行う際の躯体コンクリートの補修はジャンカ補修、欠損部の補修、目違い補修や屋上の防水工事を行う際に水勾配を取る場合がある。   Various finishes are applied to the building structure depending on the construction site. The outer wall is tiled and finished paint is applied, and the roof is waterproofed such as waterproofing of the paint film and asphalt. In addition, indoors will be clothed, floored, and stoned on the entrance floor. The repair of the frame concrete during these constructions may take a water gradient when performing junker repairs, defect repairs, misplacement repairs, or rooftop waterproofing work.
モルタルでコンクリート構造物を補修する場合、厚塗りする箇所と薄塗りする箇所が不連続に発生する。一般的には、薄塗用補修モルタルと厚塗用補修モルタルの2種を用いて補修を行うため、補修工事は煩雑であり時間の掛かる作業である。そのため、真珠岩パーライト、黒曜石パーライト、減水剤を組み合わせ施工厚さ1mm以下から10mm程度まで施工可能な補修モルタルが考案されている(特許文献1)。しかし、パーライトと減水剤を併用すると施工時の環境温度の影響を受けやすくなり、寒冷期には凝結が遅れ、外壁に施工した場合ダレの発生する恐れがある。   When repairing a concrete structure with mortar, a thick coating and a thin coating occur discontinuously. Generally, since repair is performed using two types of repair mortar for thin coating and repair mortar for thick coating, the repair work is complicated and time consuming. Therefore, a repair mortar that can be constructed from a construction thickness of 1 mm or less to about 10 mm in combination with pearlite pearlite, obsidian pearlite, and a water reducing agent has been devised (Patent Document 1). However, when pearlite and a water reducing agent are used in combination, they are easily affected by the environmental temperature during construction, and in the cold season, condensation is delayed and there is a risk of sagging when constructed on the outer wall.
軽量骨材、ポゾラン物質、有機繊維、ポリマーを併用し、躯体コンクリートとの付着性改善、乾燥収縮の低減を図るとともに1回の施工厚さが60mmまで可能な補修モルタルが考案されている(特許文献2)このモルタルは、厚付け性能を向上させるため、軽量骨材が多く練混ぜ水量が多くなっており、曲げ強度が低下している。厚付け性能は向上しているが薄付けが困難であるため、水勾配を取る必要がある屋上の防水工事用材料には不向きである。   A repair mortar has been devised that uses lightweight aggregate, pozzolanic material, organic fiber, and polymer to improve adhesion to reinforced concrete, reduce drying shrinkage, and allows a single construction thickness of up to 60 mm (patent) Reference 2) In order to improve the thickening performance, this mortar has many lightweight aggregates and a large amount of water to be mixed, and the bending strength is lowered. Thickening performance is improved but thinning is difficult, so it is unsuitable for roofing waterproofing materials that require a water gradient.
また、コンクリート構造物を補修する場合、躯体コンクリートとの付着性、強度、防水性を付与するため、一般にポリマーセメントモルタルが使用される。多くの場合、保水剤をポリマーと併用するため、粘性が増加しコテ作業性が低下する。コテ作業性の改善策としてシラン化合物とポリマーを併用することでコテ作業性、付着性、強度を改善した補修モルタルが考案されている(特許文献3)。   Moreover, when repairing a concrete structure, polymer cement mortar is generally used in order to impart adhesion, strength, and waterproofness to the frame concrete. In many cases, since a water retaining agent is used in combination with a polymer, the viscosity increases and the iron workability decreases. As a measure for improving the iron workability, a repair mortar having improved iron workability, adhesion and strength by using a silane compound and a polymer in combination has been devised (Patent Document 3).
特開2004−175636号公報JP 2004-175636 A 特開平11−199297号公報Japanese Patent Laid-Open No. 11-199297 特開2002−20153号公報JP 2002-20153 A
しかしながら、薄塗りから厚塗りまでを可能とし、コテ作業性、付着性、平滑性及び曲げ剛性を満足するものではなく、これらの要求を満たす塗りモルタルが望まれていた。   However, thin coating to thick coating is possible and does not satisfy the iron workability, adhesion, smoothness and bending rigidity, and a coating mortar that satisfies these requirements has been desired.
そこで本発明者は、上記課題を解決すべく検討した結果、セメントに細骨材、保水剤、撥水剤及び繊維に加えて、表面が親水性であるポリマーと表面が疎水性であるポリマーとを一定の比率で配合することにより、曲げ剛性、厚塗り性、平滑性及びコテ作業性に優れる塗りモルタルが得られることを見出し、本発明を完成した。   Therefore, the present inventor has studied to solve the above problems, and as a result, in addition to fine aggregate, water retention agent, water repellent and fiber in cement, a polymer having a hydrophilic surface and a polymer having a hydrophobic surface. It was found that a coating mortar excellent in flexural rigidity, thick coating property, smoothness and trowel workability can be obtained by blending at a fixed ratio.
すなわち、本発明は、以下の[1]〜[5]に係るものである。
[1](A)セメント100質量部に対し(B)細骨材を80〜103質量部、(C)保水剤を0.09〜0.20質量部、(D)撥水剤を0.22〜0.36
質量部、(E)繊維を0.14〜0.43質量部、並びに(F)(F1)表面親水性ポリマー及び(F2)表面疎水性ポリマーを合計固形分換算で2.4〜4.1質量部含有し、(F1)表面親水性ポリマーと(F2)表面疎水性ポリマーの含有比率(F2/F1)が0.18〜0.43であることを特徴とする塗りモルタル。
[2](F1)表面親水性ポリマーが、表面親水性再乳化形粉末樹脂であり、(F2)表面疎水性ポリマーが、表面疎水性再乳化形粉末樹脂、ディスパージョン形粉末樹脂、エマルション形粉末樹脂、及びこれらの表面を脂肪酸塩又はシラン化合物で処理した粉末樹脂から選ばれるポリマーである[1]記載の塗りモルタル。
[3]セメント100体積部に対し、細骨材が104〜122体積部であり細骨材中の軽量骨材の割合が60〜70vol%である[1]又は[2]記載の塗りモルタル。
[4](E)繊維が、引張強度1500N/mm2以上のものと1500N/mm2未満のものからなり、セメント100質量部に対し、引張強度1500N/mm2以上の繊維を0.04〜0.29質量部含有する[1]〜[3]のいずれか1項記載の塗りモルタル。
[5]さらに(G)膨張材、(H)粘土鉱物及び(I)スターチ類から選ばれる1種又は2種以上を含有する[1]〜[4]のいずれかに記載の塗りモルタル。
That is, the present invention relates to the following [1] to [5].
[1] (B) 80 to 103 parts by mass of fine aggregate, (C) 0.09 to 0.20 parts by mass of water retention agent, and (D) water repellent to 0.1 part of (A) 100 parts by mass of cement. 22-0.36
Parts by mass, (E) 0.14-0.43 parts by mass of fiber, and (F) (F1) surface hydrophilic polymer and (F2) surface hydrophobic polymer in a total solid content of 2.4-4.1. A coating mortar containing part by mass and having a content ratio (F2 / F1) of (F1) surface hydrophilic polymer and (F2) surface hydrophobic polymer of 0.18 to 0.43.
[2] (F1) The surface hydrophilic polymer is a surface hydrophilic re-emulsifying powder resin, (F2) The surface hydrophobic polymer is a surface hydrophobic re-emulsifying powder resin, a dispersion-type powder resin, and an emulsion-type powder. The coating mortar according to [1], which is a polymer selected from resins and powder resins obtained by treating these surfaces with a fatty acid salt or a silane compound.
[3] The coated mortar according to [1] or [2], wherein the fine aggregate is 104 to 122 parts by volume with respect to 100 parts by volume of cement, and the ratio of the lightweight aggregate in the fine aggregate is 60 to 70 vol%.
[4] (E) fibers consists tensile strength 1500 N / mm 2 or more of the 1500 N / mm 2 less than that, 100 parts by weight of cement relative to the tensile strength of 1500 N / mm 2 or more fibers 0.04 The coating mortar according to any one of [1] to [3], containing 0.29 parts by mass.
[5] The coating mortar according to any one of [1] to [4], further containing one or more selected from (G) an expanding material, (H) a clay mineral, and (I) starches.
本発明の塗りモルタルは、曲げ剛性、厚塗り性、平滑性及びコテ作業性に優れており、コンクリート構造物外壁のタイル、仕上塗料の下地調整、屋上の塗膜防水の下地調整等の用途に極めて有用である。   The coating mortar of the present invention is excellent in bending rigidity, thick coating property, smoothness and trowel workability, and for applications such as tiles on the outer walls of concrete structures, finishing paint foundation adjustment, roof coating waterproofing foundation adjustment, etc. Very useful.
本発明の塗りモルタルに使用される(A)セメントは、水硬性のものならば制限されない。具体的には、普通、早強、超早強、中庸等、低熱等のポルトランドセメント、高炉セメントやフライアッシュセメントのような各種混合セメント、白色セメントやエコセメントのような特殊セメントを例示することができる。ここに例示した以外のセメントや2種以上のセメントを併用しても良い。   The (A) cement used in the coating mortar of the present invention is not limited as long as it is hydraulic. Specifically, portland cement such as normal, early strength, super early strength, medium strength, low heat, etc., various mixed cements such as blast furnace cement and fly ash cement, and special cements such as white cement and eco cement Can do. You may use together cement other than having illustrated here, or 2 or more types of cement.
本発明の塗りモルタルに使用される(B)細骨材は、通常のモルタルに使用されるものであれば限定されないが、普通骨材と軽量骨材を併用することが好ましい。普通骨材は、モルタルやコンクリートに使用できるものなら何れのものでも良く、例えば、市販の珪砂、寒水石、石灰石砂その他、川砂、海砂、山砂、砕砂等を挙げることができる。また、軽量骨材は、例えばEVA炭酸カルシウム発泡骨材やスチレン発泡骨材等の有機材質の軽量骨材や天然又は人工の無機材質の軽量骨材の何れでも使用できる。細骨材は、厚塗り性、コテ作業性の点から、セメント100質量部に対して80〜103質量部使用する必要があり、81〜92質量部使用するのが好ましい。   The fine aggregate (B) used in the coating mortar of the present invention is not limited as long as it is used in ordinary mortar, but it is preferable to use ordinary aggregate and lightweight aggregate in combination. The ordinary aggregate may be any material as long as it can be used for mortar and concrete, and examples thereof include commercially available silica sand, cryolite, limestone sand, river sand, sea sand, mountain sand, and crushed sand. Further, as the lightweight aggregate, any of lightweight aggregates made of organic materials such as EVA calcium carbonate foam aggregate and styrene foam aggregate, and light aggregates made of natural or artificial inorganic materials can be used. The fine aggregate needs to be used in an amount of 80 to 103 parts by mass with respect to 100 parts by mass of cement, and is preferably used in an amount of 81 to 92 parts by mass, from the viewpoint of thick coatability and iron workability.
普通骨材としては、粒度管理された市販の珪砂、寒水石、石灰石砂が本発明の塗りモルタルの品質を管理する上で好ましい。例えば、朝日珪砂鉱業(株)製商品名「朝日珪砂5号」、(株)トウチュウ製商品名「鹿島珪砂6号」、「鹿島珪砂7号」、日立寒水石(株)製
商品名「日立寒水石1号」などが挙げられる。軽量骨材を含む細骨材は、セメント100体積部に対し104〜122体積部使用するのが好ましい。当該細骨材が少ないと、厚塗り性が低下するとともに収縮量が大きくなり、ひび割れの発生する恐れがある。また、多すぎると強度低下が大きくなるとともにコテ作業性が低下するので適当ではない。細骨材中の軽量骨材の割合は60〜70vol%が好ましく、より好ましくは62〜69vol%である。軽量骨材が少ないと厚塗り性が低下し、厚塗りするとダレが発生する。さらに、粘性が上がりコテ作業性も低下する。軽量骨材が多すぎると、強度低下が発生するとともに練混ぜ水量が増加し、硬化後収縮量が増加しひび割れの発生する恐れがあるので適当ではない。
As the ordinary aggregate, commercially available silica sand, cold water stone, and limestone sand whose particle size is controlled are preferable for controlling the quality of the coating mortar of the present invention. For example, Asahi Silica Mining Co., Ltd. trade name “Asahi Silica Sand No. 5”, Tochu Co., Ltd. trade name “Kashima Silica Sand No. 6”, “Kashima Silica Sand No. 7”, Hitachi Kansui Stone Co., Ltd. trade name “Hitachi” "Samsui stone No. 1". The fine aggregate including the lightweight aggregate is preferably used in an amount of 104 to 122 parts by volume with respect to 100 parts by volume of cement. If the amount of the fine aggregate is small, the coatability deteriorates and the amount of shrinkage increases, which may cause cracks. On the other hand, if the amount is too large, the strength is lowered and the iron workability is lowered, which is not suitable. The proportion of the lightweight aggregate in the fine aggregate is preferably 60 to 70 vol%, more preferably 62 to 69 vol%. If there is little lightweight aggregate, thick coating property will fall, and if it coats thickly, sagging will occur. Furthermore, the viscosity increases and the workability of the iron also decreases. If there are too many lightweight aggregates, the strength will decrease and the amount of kneaded water will increase, the shrinkage after hardening will increase, and cracks may occur, which is not suitable.
本発明の塗りモルタルに使用する(C)保水剤は、モルタル又はコンクリートで使用できるものなら何れのものでも良く、例えば水溶性セルロース誘導体やポリビニルアルコール類を挙げることができる。水溶性セルロース誘導体としては、例えばメチルセルロース、カルボキシメチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルメチルセルロース、ヒドロキシプロピルセルロース、セルロース硫酸エステル等のセルロース誘導体を挙げることができる。例えば、信越化学工業(株)製商品名「メトローズSB
P30501」が使用可能である。
The water retention agent (C) used in the coating mortar of the present invention may be any one that can be used in mortar or concrete, and examples thereof include water-soluble cellulose derivatives and polyvinyl alcohols. Examples of the water-soluble cellulose derivative include cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl cellulose, and cellulose sulfate. For example, trade name “Metrozu SB” manufactured by Shin-Etsu Chemical Co., Ltd.
P30501 "can be used.
(C)保水剤を使用することでモルタルの左官施工時の躯体コンクリートへの付着性を向上することができ、硬化後の乾燥ひび割れの発生や剥離・剥落を防ぐことができる。(C)保水剤の使用量は、セメント100質量部に対し、0.09〜0.20質量部が好ましく、0.09〜0.15質量部がより好ましい。
この範囲で使用することにより、付着性、コテ作業性等が良好となる。
(C) By using a water retention agent, it is possible to improve the adhesion of the mortar to the concrete at the time of plastering, and it is possible to prevent the occurrence of dry cracks after curing and peeling / peeling. (C) 0.09-0.20 mass part is preferable with respect to 100 mass parts of cement, and, as for the usage-amount of a water retention agent, 0.09-0.15 mass part is more preferable.
By using in this range, adhesion, iron workability and the like are improved.
本発明に使用される(D)撥水剤としては、シラン系撥水剤が好ましい。シラン系撥水剤は、セメントモルタルに混和し高アルカリ条件下で反応性のシラノールになるシラン化合物が好ましい。例えば、有機シラン、ポリシラン等である。具体例としては、アクゾノーベル(株)製商品名「シール80」等である。反応性シラノールは、シラノール基間の架橋
や無機化合物との反応により表面が疎水性に変性される。そのため、シラン系撥水剤は練混ぜ性状が良く、本発明の高耐久仕上材は硬化後優れた撥水性を発揮する。
As the water repellent (D) used in the present invention, a silane water repellent is preferable. The silane water repellent is preferably a silane compound that is mixed with cement mortar and becomes reactive silanol under high alkaline conditions. For example, organic silane, polysilane and the like. As a specific example, there is a trade name “Seal 80” manufactured by Akzo Nobel Co., Ltd. The surface of reactive silanol is modified to be hydrophobic by crosslinking between silanol groups or reaction with an inorganic compound. Therefore, the silane water repellent has good kneading properties, and the highly durable finish of the present invention exhibits excellent water repellency after curing.
(D)撥水剤は、セメント100質量部に対し、0.22〜0.36質量部使用するのが好ましく、より好ましくは0.22〜0.30質量部使用される。撥水剤が少なすぎると、適正な撥水性が得られず、混和した効果がない。一方、多すぎると撥水効果の改善は小さく不経済である。   (D) The water repellent is preferably used in an amount of 0.22 to 0.36 parts by mass, more preferably 0.22 to 0.30 parts by mass with respect to 100 parts by mass of cement. When there are too few water repellents, appropriate water repellency cannot be obtained and there is no mixed effect. On the other hand, if the amount is too large, the improvement of the water repellent effect is small and uneconomical.
本発明に使用される(E)繊維としては、耐アルカリ繊維が好ましい。耐アルカリ繊維は、塗りモルタルとしての厚塗り性と曲げ強度を低下させないように、繊維長10mm以上が好ましい。市販の繊維には単繊維と収束型があるがどちらも使用可能である。さらに、好ましくは繊維長10〜25mmのものが良い。繊維長が短すぎると、ダレ止めの効果はあるが曲げ強度の向上効果は得られない。耐アルカリ性を有すればモルタルに混和可能な有機繊維、ガラス繊維とも使用可能であり、併用することも可能である。有機繊維としては、ポリエステル、アクリル、ナイロン、ポリプロピレン等が使用可能であり、ガラス繊維は耐アルカリ性を有するガラス繊維が使用可能である。   The (E) fiber used in the present invention is preferably an alkali resistant fiber. The alkali resistant fiber preferably has a fiber length of 10 mm or more so as not to reduce the thick coatability and bending strength as the coating mortar. Commercially available fibers include single fibers and convergent types, but both can be used. Furthermore, a fiber length of 10 to 25 mm is preferable. If the fiber length is too short, there is an effect of stopping drooping, but an effect of improving the bending strength cannot be obtained. Organic fibers and glass fibers that are miscible with mortar can be used as long as they have alkali resistance, and they can be used in combination. As the organic fiber, polyester, acrylic, nylon, polypropylene or the like can be used, and glass fiber having alkali resistance can be used as the glass fiber.
(E)繊維の使用量は、厚塗り性、曲げ強度、コテ作業性を向上させる点から、セメント100質量部に対し0.14〜0.43質量部が好ましく、さらに好ましくは0.15〜0.39質量部が良い。   (E) The amount of the fiber used is preferably 0.14 to 0.43 parts by mass, more preferably 0.15 to 100 parts by mass with respect to 100 parts by mass of cement, from the viewpoint of improving thick coatability, bending strength, and iron workability. 0.39 mass part is good.
厚塗りモルタルとしての厚塗り性、曲げ強度、コテ作業性を同時に向上させるためには、引張強度1500N/mm2以上の繊維と1500N/mm2未満の繊維を併用することが好ましい。セメント100質量部に対し、引張強度1500N/mm2以上の繊維を0.04〜0.29質量部使用することが好ましく、さらに好ましくは0.05〜0.29質量部である。 In order to simultaneously improve thick coatability, bending strength, and iron workability as a thick coat mortar, it is preferable to use a fiber having a tensile strength of 1500 N / mm 2 or more and a fiber of less than 1500 N / mm 2 . It is preferable to use 0.04 to 0.29 parts by mass of fibers having a tensile strength of 1500 N / mm 2 or more with respect to 100 parts by mass of cement, and more preferably 0.05 to 0.29 parts by mass.
本発明においては(F)(F1)表面親水性ポリマーと(F2)表面疎水性ポリマーとを併用するのが、コテ作業性向上性の点で必要である。通常、セメントに配合される再乳化形粉末樹脂は、ポリマー表面が疎水性であり、セルロース誘導体等の保水剤と併用すると粘性が高くなりすぎコテ作業性が低下する。本発明においては、(F2)表面が疎水性であるポリマーに加えて(F1)表面が親水性であるポリマーと併用することにより、施工中の粘度増加を抑制でき、コテ作業性が向上する。
(F1)表面親水性ポリマーとしては、表面親水性再乳化形粉末樹脂が挙げられ、樹脂表面が例えばポリビニルアルコール、ポリアクリル酸、ポリビニルピロリドン、ポリアクリルアミド、ポリエチレンイミン、ポリエチレンオキシド等で処理された再乳化形粉末樹脂が挙げられる。このうち、ポリビニルアルコールで処理された再乳化形粉末樹脂がより好ましい。粉末樹脂本体としては、エチレン酢酸ビニル、酢酸ビニル/バーサテック酸ビニルエステル、酢酸ビニル/バーサテック酸ビニル/アクリル酸エステル、ポリアクリル酸エステルなどを主成分とする樹脂が挙げられる。
In the present invention, it is necessary to use (F) (F1) surface hydrophilic polymer and (F2) surface hydrophobic polymer in view of improving the workability of the iron. Usually, a re-emulsified powder resin blended in cement has a hydrophobic polymer surface, and when used in combination with a water retention agent such as a cellulose derivative, the viscosity becomes too high and the iron workability is lowered. In the present invention, in addition to the polymer (F2) whose surface is hydrophobic, in combination with the polymer (F1) whose surface is hydrophilic, an increase in viscosity during construction can be suppressed, and the iron workability is improved.
(F1) Surface hydrophilic polymer includes surface hydrophilic re-emulsifying powder resin, and the resin surface is treated with, for example, polyvinyl alcohol, polyacrylic acid, polyvinyl pyrrolidone, polyacrylamide, polyethyleneimine, polyethylene oxide, etc. An emulsified powder resin may be mentioned. Of these, re-emulsified powder resin treated with polyvinyl alcohol is more preferred. Examples of the powder resin main body include resins mainly composed of ethylene vinyl acetate, vinyl acetate / versatechnic acid vinyl ester, vinyl acetate / vinyl versatate / acrylic acid ester, and polyacrylic acid ester.
(F2)表面疎水性ポリマーとしては、表面疎水性再乳化形粉末樹脂、ディスパージョン形粉末樹脂、エマルション形粉末樹脂、及びこれらの表面を脂肪酸塩、シラン化合物等で表面処理した粉末樹脂が挙げられる。これらの粉末樹脂本体としては、エチレン酢酸ビニル、酢酸ビニル/バーサテック酸ビニルエステル、酢酸ビニル/バーサテック酸ビニル/アクリル酸エステル、ポリアクリル酸エステルなどを主成分とする樹脂が挙げられる。   (F2) Surface hydrophobic polymer includes surface hydrophobic re-emulsifying powder resin, dispersion-type powder resin, emulsion-type powder resin, and powder resin whose surface is treated with a fatty acid salt, a silane compound, or the like. . Examples of these powder resin bodies include resins mainly composed of ethylene vinyl acetate, vinyl acetate / versatechnic acid vinyl ester, vinyl acetate / versatechnic acid vinyl / acrylic acid ester, polyacrylic acid ester, and the like.
これらの(F)ポリマーは、セメント100質量部に対して、合計固形分換算で2.4〜4.1質量部がするのが好ましく、より好ましくは、2.7〜3.5質量部である。2.4質量部未満では、適性な付着強度が得られないとともに吸水量が増加する。4.1質量部を超えるとコテ作業性が低下するとともに近隣の建築構造物で火災が起きた際本発明の厚塗りモルタルが着火する恐れが高まる。さらに(F1)表面親水性ポリマーと(F2)表面疎水性ポリマーの含有比率(F2/F1)は0.18〜0.43が好ましく、より好ましくは0.37〜0.42である。0.18未満では、コテ作業性の改善効果がえられない。0.43を超えると粘性が低下し、厚塗り性が低下する。   These (F) polymers are preferably used in an amount of 2.4 to 4.1 parts by mass, more preferably 2.7 to 3.5 parts by mass based on 100 parts by mass of cement. is there. If the amount is less than 2.4 parts by mass, suitable adhesion strength cannot be obtained and the amount of water absorption increases. When the amount exceeds 4.1 parts by mass, the workability of the iron is lowered and the risk of ignition of the thick mortar of the present invention increases when a fire occurs in a nearby building structure. Furthermore, the content ratio (F2 / F1) of (F1) surface hydrophilic polymer and (F2) surface hydrophobic polymer is preferably 0.18 to 0.43, more preferably 0.37 to 0.42. If it is less than 0.18, the improvement effect of iron workability cannot be obtained. When it exceeds 0.43, the viscosity is lowered and the thick coatability is lowered.
本発明の塗りモルタルには、前記成分に加えて、(G)膨張材、(H)粘土鉱物及び(I)スターチ類から選ばれる1種又は2種以上を配合することができる。   In addition to the said component, the coating mortar of this invention can mix | blend 1 type (s) or 2 or more types chosen from (G) expansion | swelling material, (H) clay mineral, and (I) starches.
本発明の塗りモルタルに使用できる(G)膨張材としては、モルタルやコンクリートに使用可能なものであれば特に限定されず、水和膨張性の膨張材として生石灰を有効成分とするものやカルシウムサルフォア ルミネートを有効成分とするものを挙げることができる。膨張材を配合使用することで、主に乾燥収縮が抑制され、施工箇所の形状寸法安定性が図れると共に収縮亀裂の発生を防ぐことができる。例えば、太平洋マテリアル(株)製商品名「太平洋エクスパン(構造用)」、商品名「太平洋ジプカル」等が挙げられる。
(G)膨張材の使用量は、収縮低減効果、ひび割れ防止等の点で、セメント100質量部に対し4.5〜5.7質量部が好ましく、より好ましくは4.7〜5.7質量部である。
The (G) expandable material that can be used in the coating mortar of the present invention is not particularly limited as long as it can be used for mortar and concrete. Mention may be made of fore luminescence as an active ingredient. By blending and using the expansion material, drying shrinkage is mainly suppressed, the shape and dimension stability of the construction site can be achieved, and the occurrence of shrinkage cracks can be prevented. For example, trade name “Pacific Expan (for structure)” manufactured by Taiheiyo Material Co., Ltd., trade name “Pacific Gypcal”, and the like can be given.
(G) The amount of the expansion material used is preferably 4.5 to 5.7 parts by mass, more preferably 4.7 to 5.7 parts by mass with respect to 100 parts by mass of cement in terms of shrinkage reduction effect, crack prevention, and the like. Part.
本発明の塗りモルタルに使用できる(H)粘土鉱物は、コテ作業性改善効果のあるセピオライト、ベントナイトが好ましい。セピオライトは、繊維状の含水マグネシウム珪酸塩である。互いに積み重ねたチャンネル構造をしており、多孔質で比表面積が大きい繊維状形態をした粘土鉱物であるため、ダレ止め効果がある。例えば、セピオライトは、巴工業(株)製商品名「IGS」が使用可能である。
粘土鉱物の使用量は、コテ作業性改善効果、ひび割れ防止の点から、セメント100質量部に対し0.2〜0.9質量部が好ましく、より好ましくは0.2〜0.6質量部である。
The (H) clay mineral that can be used in the coating mortar of the present invention is preferably sepiolite or bentonite that has an effect of improving the iron workability. Sepiolite is a fibrous hydrous magnesium silicate. The clay minerals have a channel structure stacked on top of each other and are porous and fibrous in shape with a large specific surface area. For example, Sepiolite can use the trade name “IGS” manufactured by Sakai Kogyo Co., Ltd.
The amount of the clay mineral used is preferably 0.2 to 0.9 parts by mass, more preferably 0.2 to 0.6 parts by mass with respect to 100 parts by mass of cement, from the viewpoint of improving the workability of the iron and preventing cracks. is there.
(I)スターチ類としては、スターチエーテル、コーンスターチ、ポテトスターチが使用できる。スターチエーテルとしては、例えば、SKWイーストアジア(株)製商品名「チロビスSE-7」、「STARVIS SE25F」等が挙げられる。スターチ類はコテ作業性の改善を目的としている点から、その使用量はセメント100質量部に対し、0.01〜0.03質量部が好ましく、より好ましくは0.015〜0.025質量部である。   (I) As starches, starch ether, corn starch, and potato starch can be used. Examples of the starch ether include SKW East Asia Co., Ltd. trade names “Tyrobis SE-7”, “STARVIS SE25F”, and the like. Since the starches are intended to improve the iron workability, the amount of use is preferably 0.01 to 0.03 parts by mass, more preferably 0.015 to 0.025 parts by mass with respect to 100 parts by mass of cement. It is.
本発明の塗りモルタルには、通常セメント組成物に対して使用される各種混和材、添加剤を使用することが可能である。例えば、鉱物油系、ポリエーテル系、シリコーン系の消泡剤が使用可能である。また、各種スラグ粉末;フライアッシュ、シリカフューム等のポゾラン物質、硬化促進剤、硬化遅延剤等が使用可能である。   In the coating mortar of the present invention, various admixtures and additives usually used for cement compositions can be used. For example, mineral oil-based, polyether-based, and silicone-based antifoaming agents can be used. Further, various slag powders; pozzolanic substances such as fly ash and silica fume, curing accelerators, curing retarders and the like can be used.
本発明の塗りモルタルは、前記成分に水を添加混合し、通常の塗り作業、例えばコテ塗りにより、コンクリート構造物外壁のタイル、仕上塗料の下地調整、屋上の塗膜防水の下地調整等に用いることができる。   The coating mortar of the present invention is mixed with the above components by adding water and used for normal coating work, for example, trowel coating, tiles on the outer wall of concrete structures, finishing paint foundation adjustment, roof coating waterproofing foundation adjustment, etc. be able to.
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.
実施例1〜15及び比較例1〜14
表1に示した材料を用い、表2及び表3に示す配合の塗りモルタルを製造した。
Examples 1-15 and Comparative Examples 1-14
Using the materials shown in Table 1, coating mortars having the formulations shown in Tables 2 and 3 were produced.
表2及び表3の塗りモルタルを用いて、曲げ強度(材齢28日)、圧縮強度(材齢28日)、付着強度(材齢2日)、長さ変化率及び吸水量を測定した。測定方法を表4に示し、評価方法を表5〜表7に示す。また試験結果を表8〜9に示す。   Using the coating mortar of Table 2 and Table 3, bending strength (material age 28 days), compressive strength (material age 28 days), adhesion strength (material age 2 days), length change rate and water absorption were measured. The measurement methods are shown in Table 4, and the evaluation methods are shown in Tables 5 to 7. Test results are shown in Tables 8-9.
次に、表及び表3の塗りモルタルを用いて、コテ作業性を評価した。   Next, the iron workability was evaluated using the coating mortars shown in Tables and Table 3.
(試験方法)
20℃の試験室で450×900×60mmコンクリート版に10mm厚さで400×45
0mmの範囲で金コテで各試料を塗り付け、コテ作業性の評価を行った。
(1)コテ切れ
金ゴテに試料が付着せず、2回以内に平滑に塗り付けられた ◎
金ゴテに試料が付着しないが、平滑に塗り付けるために3回以上要した ○
金ゴテに試料が付着した ×
(2)コテ伸び
試料を容易に金ゴテで押し広げることができ、平滑にできる ◎
試料を容易に金ゴテで押し広げることができるが、平滑に塗り付けるために3回以上要する ○
試料を容易に金ゴテで押し広げることができない ×
(3)ダレの有無
ダレの発生がない 無
ダレの発生がある 有
(Test method)
400x45 in 10mm thickness on 450x900x60mm concrete slab in 20 ° C test room
Each sample was applied with a gold iron within a range of 0 mm to evaluate the iron workability.
(1) Solder cut The sample did not adhere to the gold trowel and was applied smoothly within 2 times.
The sample does not adhere to the gold trowel, but it took more than 3 times to apply it smoothly.
A sample adhered to a gold trowel ×
(2) Iron elongation The sample can be easily spread with a gold trowel and smoothed.
The sample can be easily spread with a gold trowel, but it takes 3 or more times to apply it smoothly.
The sample cannot be easily spread with a gold trowel ×
(3) Presence / absence of sag No sag
結果を表10及び表11に示す。   The results are shown in Table 10 and Table 11.
表1〜表11から明らかなように、本発明の塗りモルタルは、曲げ強度、圧縮強度、付着性が良好で、かつコテ作業性も良好であった。   As is apparent from Tables 1 to 11, the coating mortar of the present invention had good bending strength, compressive strength, adhesion, and good workability.

Claims (5)

  1. (A)セメント100質量部に対し(B)細骨材を80〜103質量部、(C)保水剤を0.09〜0.20質量部、(D)撥水剤を0.22〜0.36質量部、(E)繊維を0.14〜0.43質量部、並びに(F)(F1)表面親水性ポリマー及び(F2)表面疎水性ポリマーを合計固形分換算で2.4〜4.1質量部含有し、(F1)表面親水性ポリマーと(F2)表面疎水性ポリマーの含有比率(F2/F1)が0.18〜0.43であることを特徴とする塗りモルタル。   (A) 80 to 103 parts by mass of fine aggregate with respect to 100 parts by mass of cement, (C) 0.09 to 0.20 parts by mass of water retention agent, and (D) 0.22 to 0 of water repellent. .36 parts by mass, (E) 0.14 to 0.43 parts by mass of fiber, and (F) (F1) surface hydrophilic polymer and (F2) surface hydrophobic polymer in a total solid content of 2.4 to 4 A coating mortar containing 1 part by mass and having a content ratio (F2 / F1) of (F1) surface hydrophilic polymer and (F2) surface hydrophobic polymer of 0.18 to 0.43.
  2. (F1)表面親水性ポリマーが、表面親水性再乳化形粉末樹脂であり、(F2)表面疎水性ポリマーが、表面疎水性再乳化形粉末樹脂、ディスパージョン形粉末樹脂、エマルション形粉末樹脂、及びこれらの表面を脂肪酸塩又はシラン化合物で処理した粉末樹脂から選ばれるポリマーである請求項1記載の塗りモルタル。   (F1) the surface hydrophilic polymer is a surface hydrophilic re-emulsifying powder resin, and (F2) the surface hydrophobic polymer is a surface hydrophobic re-emulsifying powder resin, a dispersion-type powder resin, an emulsion-type powder resin, and The coating mortar according to claim 1, which is a polymer selected from powder resins obtained by treating these surfaces with a fatty acid salt or a silane compound.
  3. セメント100体積部に対し、細骨材が104〜122体積部であり細骨材中の軽量骨材の割合が60〜70vol%である請求項1又は2記載の塗りモルタル。   The coated mortar according to claim 1 or 2, wherein the fine aggregate is 104 to 122 parts by volume with respect to 100 parts by volume of cement, and the ratio of the lightweight aggregate in the fine aggregate is 60 to 70 vol%.
  4. (E)繊維が、引張強度1500N/mm2以上のものと1500N/mm2未満のものからなり、セメント100質量部に対し、引張強度1500N/mm2以上の繊維を0.04〜0.29質量部含有する請求項1〜3のいずれか1項記載の塗りモルタル。 (E) fibers, the tensile strength 1500 N / mm consists of two or more of the 1500 N / mm 2 less than that, 100 parts by weight of cement relative to the tensile strength of 1500 N / mm 2 or more fibers 0.04 to 0.29 The coating mortar according to any one of claims 1 to 3, which contains part by mass.
  5. さらに(G)膨張材、(H)粘土鉱物及び(I)スターチ類から選ばれる1種又は2種以上を含有する請求項1〜4のいずれかに記載の塗りモルタル。   Furthermore, the coating mortar in any one of Claims 1-4 containing 1 type, or 2 or more types chosen from (G) expansion | swelling material, (H) clay mineral, and (I) starches.
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