JP4784369B2 - Cement composition with improved coating workability - Google Patents
Cement composition with improved coating workability Download PDFInfo
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- JP4784369B2 JP4784369B2 JP2006093599A JP2006093599A JP4784369B2 JP 4784369 B2 JP4784369 B2 JP 4784369B2 JP 2006093599 A JP2006093599 A JP 2006093599A JP 2006093599 A JP2006093599 A JP 2006093599A JP 4784369 B2 JP4784369 B2 JP 4784369B2
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
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Description
本発明は、鏝離れ性が良好で、良好な施工仕上げ面の形成に適した保水性を有しつつ、水浮きがないモルタルの調製に好適なセメント組成物に関する。 The present invention relates to a cement composition suitable for preparing a mortar having good releasability and water retention suitable for formation of a good construction finished surface and having no water floating.
コンクリート表面のモルタル塗仕上げは、施工が簡易であり経済的にも安価であることから多く用いられている。モルタル塗仕上げ工法は、使用材料としてポルトランド系セメントと砂を用いて、これに適当量の水を加えたセメントモルタルをコンクリートの表面に塗布する方法である。 The mortar coating finish on the concrete surface is often used because it is easy to construct and economical. The mortar coating finishing method is a method in which Portland cement and sand are used as materials to be used, and cement mortar to which an appropriate amount of water is added is applied to the concrete surface.
モルタル塗仕上げ表面の粗さを改善して平滑性、光沢性を向上させる方法として、特許文献1には、皮膜形成剤としてオリゴ糖あるいは澱粉糖をセメントに添加したセメント組成物が開示されている。 As a method for improving smoothness and glossiness by improving the roughness of the mortar finish surface, Patent Document 1 discloses a cement composition in which oligosaccharide or starch sugar is added to cement as a film forming agent. .
流動性を低下させることなく、低温時の凝結時間の遅れがなく、連行空気を増加させることもなく、ブリーディングや材料分離を防止する方法として、特許文献2には、セメント添加材にエーテル結合を有し、水酸化カルシウム飽和溶液中での膨潤度が2〜8重量%の架橋澱粉を用いたセメント組成物が開示されている。 As a method for preventing bleeding and material separation without lowering the fluidity, without delaying the setting time at low temperature, without increasing the entrained air, Patent Document 2 discloses that an ether bond is added to the cement additive. A cement composition using a cross-linked starch having a swelling degree of 2 to 8% by weight in a saturated calcium hydroxide solution is disclosed.
左官工によるモルタル塗仕上げ工法では、壁面あるいは床面に鏝を使用してモルタルを下塗りした後、鏝押えを行って平滑な表面に仕上げる工法が一般的にとられている。
本発明は、左官工が、鏝を用いて壁面あるいは床面に、モルタルを下塗りしたのち、再度鏝を用いて平滑な表面に仕上げる鏝押えの2段階の作業を踏むことを想定して、良好な鏝塗り作業性と優れたモルタル仕上げ面が得られるセメント組成物の提供を目的とした。
In the mortar coating finishing method by plastering, a method is generally employed in which a mortar is primed on a wall surface or a floor surface, and then a smooth surface is finished by pressing a heel.
The present invention assumes that the plasterer will perform a two-step work of a presser foot that uses a scissors to prime the wall or floor surface with a mortar and then finishes it again to a smooth surface using the scissors. An object of the present invention is to provide a cement composition capable of obtaining excellent mortar coating workability and an excellent mortar finish.
本発明者は、セメントと細骨材に、特定の保水剤と増粘剤とを組合わせて用い、モルタルを下塗りする過程で適度な保水性と適正なモルタル粘性を付与することによって、良好な鏝ばなれ性と次の仕上作業に適した微小な凹凸を有した表面状態が形成できること、さらに仕上げの鏝押え作業の過程でも、モルタル仕上げ面に対して良好な鏝ばなれ性を有しつつ、平滑な仕上げ面が得られ、仕上げ面の表面からの水浮きがなく、良好な鏝塗り作業性と優れたモルタル仕上げ面が得られることを見出して本発明を完成した。 The present inventor uses a combination of a specific water retention agent and a thickener for cement and fine aggregate, and imparts appropriate water retention and proper mortar viscosity in the process of priming the mortar. It is possible to form a surface state with fine irregularities that is suitable for the next finishing work, and also has a good finish on the mortar finished surface even in the process of finishing pressering work. The present invention was completed by finding that a smooth finished surface was obtained, no water floated from the surface of the finished surface, and good glazing workability and an excellent mortar finished surface were obtained.
即ち、本発明に係るセメント組成物は、セメント、細骨材、保水剤及び増粘剤を含み、保水剤がアミローゼとアミロペクチンとを含む天然多糖類を加工した化工澱粉であり、セメント100質量部に対して保水剤が0.02〜0.18質量部であることを特徴とするセメント組成物である。
さらに、本発明に係るセメント組成物は、セメント100質量部に対して、細骨材が50〜200質量部、増粘剤が0.02〜0.18質量部であることを特徴とするセメント組成物である。
That is, the cement composition according to the present invention is a modified starch obtained by processing a natural polysaccharide containing cement, fine aggregate, a water retention agent and a thickening agent, and the water retention agent includes amylose and amylopectin, and 100 parts by mass of cement. Is a cement composition characterized in that the water retention agent is 0.02 to 0.18 parts by mass.
Further, the cement composition according to the present invention is characterized in that the fine aggregate is 50 to 200 parts by mass and the thickener is 0.02 to 0.18 parts by mass with respect to 100 parts by mass of the cement. It is a composition.
本発明のセメント組成物の好ましい様態を示し、これらは複数組合わせることができる。
1)増粘剤がメチルセルロース系増粘剤であること。
2)セメント組成物が、さらに膨張材と滑性骨材と軽量骨材とから選ばれる少なくとも1種を含み、コンクリートの断面修復に用いられること。
3)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こと。
4)セメント組成物と水との配合物を硬化させて得られる硬化物であること。
The preferable aspect of the cement composition of this invention is shown, These can be combined multiplely.
1) The thickener is a methylcellulose thickener.
2) The cement composition further includes at least one selected from an expanding material, a sliding aggregate, and a lightweight aggregate, and used for the cross-sectional repair of concrete.
3) A mortar obtained by kneading a cement composition and water.
4) A cured product obtained by curing a blend of cement composition and water.
本発明のセメント組成物は、セメントに保水剤と増粘剤とを組合わせて用い、モルタルを粗塗りする過程で適度な保水性と適正なモルタル粘性を付与することによって、良好な鏝ばなれ性と次の仕上作業に適した微小な凹凸を有した表面状態が形成できること、さらに仕上げの鏝作業の過程でも、モルタル仕上げ面に対して良好な鏝ばなれ性を有しつつ、平滑な仕上げ面が得られ、仕上げ面の表面からの水浮きがなく、良好な鏝塗り作業性と優れたモルタル仕上げ面が得られるものである。 The cement composition of the present invention can be obtained by using a combination of a water retention agent and a thickening agent in cement and imparting appropriate water retention and proper mortar viscosity in the course of roughing mortar. A smooth surface finish that can form a surface condition with fine irregularities suitable for the next finishing work, and also has a good grip on the mortar finish surface even during the finishing work. A surface is obtained, there is no water floating from the surface of the finished surface, and a good mortar finish and an excellent mortar finished surface can be obtained.
本発明のセメント組成物は、セメント、細骨材、保水剤及び増粘剤の配合割合を適宜選択することができ、好ましくはセメント100質量部に対し、細骨材が50〜200質量部、さらに好ましくは52〜180質量部、より好ましくは54〜160質量部、特に好ましくは55〜150質量部含み、保水剤が0.02〜0.18質量部、さらに好ましくは0.02〜0.15質量部、より好ましくは0.025〜0.12質量部、特に0.03〜0.12質量部含むことが好ましく、増粘剤が0.02〜0.18質量部、さらに好ましくは0.02〜0.15量部、より好ましくは0.025〜0.12質量部、特に0.03〜0.12質量部含むことが好ましい。
保水剤及び増粘剤の配合割合が、それぞれ0.18質量部を超えると、下塗り作業時のコテ離れ性及び仕上げのコテ押え性が悪くなるため好ましくない。
In the cement composition of the present invention, the blending ratio of cement, fine aggregate, water retention agent and thickener can be appropriately selected. Preferably, the fine aggregate is 50 to 200 parts by mass with respect to 100 parts by mass of cement. More preferably, it contains 52 to 180 parts by mass, more preferably 54 to 160 parts by mass, and particularly preferably 55 to 150 parts by mass, and the water retention agent is 0.02 to 0.18 parts by mass, and more preferably 0.02 to 0.0. 15 parts by mass, more preferably 0.025 to 0.12 parts by mass, particularly preferably 0.03 to 0.12 parts by mass, and the thickener is 0.02 to 0.18 parts by mass, more preferably 0. 0.02 to 0.15 parts by mass, more preferably 0.025 to 0.12 parts by mass, and particularly preferably 0.03 to 0.12 parts by mass.
If the blending ratio of the water retention agent and the thickener exceeds 0.18 parts by mass, the iron releasability at the time of undercoating and the iron holding ability of the finish are deteriorated.
特に細骨材、保水剤及び増粘剤の配合量は、上記範囲が保水性とモルタル粘性のバランスに優れ、良好な鏝離れ性と表面性状に優れたモルタル硬化体が得られる。 In particular, the blending amount of fine aggregate, water retention agent and thickener is within the above range, which provides an excellent balance between water retention and mortar viscosity, and provides a cured mortar with excellent separation properties and surface properties.
本発明のセメント組成物に使用するセメントは特に限定されるものではなく、普通ポルトランドセメント、早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメントなどのポルトランドセメントや、高炉セメント、フライアッシュセメントなどの混合セメントを使用することができる。 The cement used in the cement composition of the present invention is not particularly limited, and portland cement such as ordinary Portland cement, early-strength Portland cement, medium heat Portland cement, low heat Portland cement, blast furnace cement, fly ash cement, etc. Mixed cement can be used.
本発明に使用する細骨材としては、珪砂、川砂、海砂、山砂、陸砂、寒水石、炭カルなどの砂類が使用でき、細骨材の粒度は、好ましくは0.05〜3.5mm、さらに好ましくは0.075〜2mm、特に好ましくは0.075〜1.5mmのものを好ましく用いることができる。 As the fine aggregate used in the present invention, sand such as quartz sand, river sand, sea sand, mountain sand, land sand, cryogenic stone, charcoal cal, etc. can be used, and the particle size of the fine aggregate is preferably 0.05 to 3.5 mm, more preferably 0.075 to 2 mm, particularly preferably 0.075 to 1.5 mm can be preferably used.
本発明に使用する保水剤は、馬鈴薯及びタピオカなどを主原料とした、アミローゼとアミロペクチンとを含む天然多糖類系の化工澱粉を用いることが好ましい。
本発明に好適に使用される保水剤は、馬鈴薯及びタピオカなどを主原料とする天然多糖類系の化工澱粉であり、分子構造にアミロースの直鎖構造とアミロペクチンの分枝構造を有していて、その重合度は好ましくは1800〜7000、より好ましくは2000〜6500、特に好ましくは2200〜6000の範囲のものである。
本発明に使用される保水剤は、天然多糖類系の化工澱粉であり、その乾燥状態での脂質含有量は、好ましくは0.3%以下、より好ましくは0.25%以下、特に好ましくは0.2%以下のものが好適に使用でき、コーンスターチや小麦澱粉のように乾燥状態の脂質含有量が0.5%を超えるものは本発明の保水剤として好ましくない。
上記のような天然多糖類系の化工澱粉を保水剤として用いることにより、施工面に下塗りすると、下塗り面の表面が適度な凹凸面を有する状態となり、その後の仕上げ作業に適した水分状態を保持しており、仕上げの鏝押えによって平滑な仕上面を形成できる。
As the water retention agent used in the present invention, it is preferable to use natural polysaccharide-based modified starch containing amylose and amylopectin, which are mainly made of potato and tapioca.
The water retention agent suitably used in the present invention is a natural polysaccharide-based modified starch mainly made of potato, tapioca, etc., and has a linear structure of amylose and a branched structure of amylopectin in the molecular structure. The polymerization degree is preferably in the range of 1800 to 7000, more preferably 2000 to 6500, particularly preferably 2200 to 6000.
The water retention agent used in the present invention is a natural polysaccharide-based modified starch, and its lipid content in the dry state is preferably 0.3% or less, more preferably 0.25% or less, particularly preferably. Those having a lipid content of more than 0.5% such as corn starch and wheat starch are not preferred as the water retention agent of the present invention.
By using the above natural polysaccharide-based modified starch as a water-retaining agent, when the work surface is undercoated, the surface of the undercoat surface has a moderately uneven surface and maintains a moisture state suitable for subsequent finishing operations. Therefore, a smooth finished surface can be formed by finishing the presser foot.
本発明に使用する増粘剤は、セルロース系、蛋白質系、ラテックス系、及び水溶性ポリマー系などを用いることが出来、本発明の特性を損なわない範囲で一種又は二種以上を添加することができる。本発明では、特にメチルセルロース系増粘剤を好適に用いることができる。
増粘剤を用いることによって、特に床面に厚塗り施工するような場合に、ブリーディング水の発生を大幅に抑制することができる。
As the thickener used in the present invention, cellulose-based, protein-based, latex-based, water-soluble polymer-based, and the like can be used, and one or two or more types can be added as long as the characteristics of the present invention are not impaired. it can. In the present invention, a methylcellulose thickener can be particularly preferably used.
By using a thickener, the generation of bleeding water can be significantly suppressed, particularly when thick coating is applied to the floor surface.
本発明のセメント組成物は、細骨材、保水剤及び増粘剤のほかに、必要に応じて、膨張材と滑性骨材と軽量骨材とから選ばれる少なくとも1種を配合することが好ましい。 The cement composition of the present invention may contain, in addition to the fine aggregate, water retention agent, and thickener, at least one selected from an expanding material, a sliding aggregate, and a lightweight aggregate as necessary. preferable.
本発明のセメント組成物のモルタルを壁面あるいは床面に鏝塗り施工する場合、無収縮性で硬化中の体積変化が極めて小さいことが必要であるが、本発明では、膨張材を配合することにより、モルタルの硬化時に起こる体積変化を抑制することができる。 When the mortar of the cement composition of the present invention is applied to a wall surface or a floor surface, it is necessary to have a non-shrinkable and very small volume change during curing, but in the present invention, by adding an expansion material The volume change that occurs when the mortar is cured can be suppressed.
膨張材としては、カルシウムサルフォアルミネート系、石灰−石膏系及び石灰系などの膨張材の使用が好ましく、一種又は二種以上の混合物として使用できる。特に石灰−石膏系の膨張材を用いることが好ましい。 As the expanding material, it is preferable to use an expanding material such as calcium sulfoaluminate-based, lime-gypsum-based, or lime-based, and it can be used as one kind or a mixture of two or more kinds. It is particularly preferable to use a lime-gypsum-based expansion material.
膨張材の配合量は、セメント100質量部に対して、石灰−石膏系膨張材では、好ましくは1〜20質量部、さらに好ましくは1.5〜15質量部、より好ましくは2〜12質量部、特に3〜10質量部を用いることが好ましい。 The amount of the expansion material is preferably 1 to 20 parts by mass, more preferably 1.5 to 15 parts by mass, and more preferably 2 to 12 parts by mass with respect to 100 parts by mass of the cement. In particular, it is preferable to use 3 to 10 parts by mass.
本発明のセメント組成物では、鏝塗作業性およびモルタル面の仕上りが重要な要素となり、作業性改良効果を有する滑性骨材及び/又は軽量骨材を配合することにより鏝離れ性などの作業性や仕上り面の平滑性などを改良することができる。 In the cement composition of the present invention, the workability of glazing and the finish of the mortar surface are important factors, and work such as detachment is achieved by blending a smooth aggregate and / or a lightweight aggregate having an effect of improving workability. And the smoothness of the finished surface can be improved.
滑性骨材は、鏝塗り作業において壁面や床面に塗布されたモルタルと、鏝表面との摩擦を適度に低減する効果があると考えられる。
滑性骨材としては、ろう石、滑石、タルク、パイロフィライトなどの軟質無機成分を好ましく用いることができ、滑性骨材の粒度は、好ましくは0.05〜1500μm、さらに好ましくは0.1〜1000μm、特に好ましくは0.15〜500μmのものを好ましく用いることができる。
滑性骨材の配合量は、セメント100質量部に対して、好ましくは1〜10質量部、さらに好ましくは2〜9質量部、特に好ましくは3〜8質量部の範囲が、滑性付与効果が適正で、鏝塗作業性の改善効果が高く好ましい。
It is considered that the sliding aggregate has an effect of moderately reducing the friction between the mortar applied to the wall surface or the floor surface in the glazing operation and the heel surface.
As the sliding aggregate, soft inorganic components such as wax, talc, talc, and pyrophyllite can be preferably used, and the particle size of the sliding aggregate is preferably 0.05 to 1500 μm, more preferably 0.8. One having a thickness of 1 to 1000 μm, particularly preferably 0.15 to 500 μm can be preferably used.
The amount of the lubricant aggregate is preferably 1 to 10 parts by weight, more preferably 2 to 9 parts by weight, and particularly preferably 3 to 8 parts by weight with respect to 100 parts by weight of cement. Is appropriate, and the effect of improving the coating efficiency is high and preferable.
本発明のセメント組成物では、軽量骨材を配合することにより、鏝塗りや鏝押えの過程で、軽量骨材自体の形状が一部崩壊することによって、吸水していた水分の一部がモルタル表面に開放されて作業鏝の滑りが向上し、鏝離れ性などの作業性や仕上がり面の平滑性などが改善される効果を得ることができる。
軽量骨材としては、黒曜石や真珠岩を加熱発泡させたパーライトや、石炭ガス化スラグを加熱発泡させた軽量骨材などを好適に用いることができ、特にパーライトを用いた場合、優れた鏝塗り作業性が得られることから好ましい。
本発明で用いる軽量骨材の粒度は、好ましくは0.1〜5mm、さらに好ましくは0.2〜4mm、特に好ましくは0.3〜3mmのものを好ましく用いることができる。
軽量骨材の配合量は、セメント100質量部に対して、好ましくは50〜200リットル、さらに好ましくは80〜180リットル、特に好ましくは100〜150リットルの範囲で良好な鏝塗り作業性を得ることができる。
In the cement composition of the present invention, by blending a lightweight aggregate, the shape of the lightweight aggregate itself partially collapses in the process of wrinkling and pressing, so that a part of the absorbed water is mortar. Opening to the surface improves the slipping of the work rod, so that it is possible to obtain an effect of improving workability such as releasability and smoothness of the finished surface.
As the lightweight aggregate, pearlite obtained by heating and foaming obsidian or pearlite, and lightweight aggregate obtained by heating and foaming coal gasification slag can be suitably used. It is preferable because workability can be obtained.
The particle size of the lightweight aggregate used in the present invention is preferably 0.1 to 5 mm, more preferably 0.2 to 4 mm, and particularly preferably 0.3 to 3 mm.
The blending amount of the lightweight aggregate is preferably 50 to 200 liters, more preferably 80 to 180 liters, and particularly preferably 100 to 150 liters with respect to 100 parts by mass of cement to obtain a good glazing workability. Can do.
本発明のセメント組成物では、滑性骨材と軽量骨材とを合わせて用いることが好ましい。これは、滑性骨材が有する効果、即ちモルタルと鏝表面との摩擦を適度に低減する効果と、軽量骨材が吸水していた水分の一部をモルタル表面に開放する効果が、相乗的に機能し合うものと考えられ、それぞれを単独で用いるよりも優れた鏝離れ性などの作業性と仕上がり面の平滑性を得ることができる。 In the cement composition of the present invention, it is preferable to use a sliding aggregate and a lightweight aggregate together. This is synergistic between the effects of slippery aggregates, that is, the effect of moderately reducing the friction between the mortar and the heel surface, and the effect of releasing a part of the water absorbed by the lightweight aggregate to the mortar surface. Therefore, it is possible to obtain better workability such as separation and smoothness of the finished surface than using each of them independently.
本発明のセメント組成物は、細骨材、保水剤及び増粘剤のほかに、必要に応じて本発明の特性を損なわない範囲で、流動化剤、凝結速度調整剤、高分子エマルジョン、有機短繊維などの成分を配合することができる。 The cement composition of the present invention can be used in addition to fine aggregates, water retention agents and thickeners, as long as it does not impair the properties of the present invention, if necessary, a fluidizing agent, a setting speed adjusting agent, a polymer emulsion, an organic Components such as short fibers can be blended.
本発明のセメント組成物は、水の添加量を調整することにより、流動性、保水量、鏝塗り作業性などを調整することができる。 The cement composition of the present invention can adjust the fluidity, water retention amount, glazing workability, and the like by adjusting the amount of water added.
水の添加量は、セメント組成物100質量部に対し、好ましくは20〜50質量部、さらに好ましくは23〜45質量部、より好ましくは25〜42質量部、特に好ましくは25〜40質量部加えて用いることが好ましい。 The amount of water added is preferably 20 to 50 parts by mass, more preferably 23 to 45 parts by mass, more preferably 25 to 42 parts by mass, and particularly preferably 25 to 40 parts by mass with respect to 100 parts by mass of the cement composition. Are preferably used.
以下、本発明を実施例に基づき、さらに詳細に説明する。但し、本発明は下記実施例により制限されるものでない。 Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.
(特性の評価方法)
1)フロー値(mm):
JIS R 5201 セメントの物理試験方法のフロー試験に準ずる。
2)保水性(mm):
厚さ5mmの磨き板ガラスの上にJIS P 3801に規定する5Aろ紙(直径11cm)をのせ、その中央部にリング型枠(真ちゅう製で内径50mm、高さ10mm、厚さ3mm)を設置し、練り混ぜたモルタルを型枠内に平滑に詰め込む。その後、直ちにリング型枠上部に、ろ紙およびガラス板を当て上下を逆さにひっくり返して静置する。5分後に上部ろ紙へにじみ出た水分の広がりが最大と認められた方向と、これに直角な方向の長さをスケール用いて1mmまで測定し、二方向の測定値の平均長さを保水性とする。
3)下塗りの表面状態(凹凸状態)および仕上げ鏝押えの表面状態(平滑性):
練り上がったモルタルをコテ板に取り、左官用コテを用いてコンクリート壁面および床面に、充分にコテ圧をかけて擦り付け(地ごすり)、下地とセメント組成物とを馴染ませた後、下塗りを想定して10mm厚さに一回で塗り付け、そのモルタル表面の凹凸状態を観察する。
次に、下塗りしたモルタル表面の水分(水引き)状態を確認し、仕上コテにて下塗りモルタル表面を押さえて、仕上りの平滑状態を確認する。
4)塗り付け後の表面の水浮き:
JIS R 5201セメントの物理試験方法の機械練り用練混ぜ機を用い、試料1kgを練り鉢に入れ、練混ぜ機を始動させながら、適正フロー値が得られる量の混練水を注ぎ入れ3分間練混ぜる。練り上がったモルタル表面を軽く均した後、練り鉢内で静置し、1時間後のモルタル表面の水浮き(ブリーディング水)の有無を確認する。
5)鏝離れ(施工性):
練り上がったモルタルを、左官用コテを用いて壁面および床面に塗り付けた際のモルタルとコテとの付着度合・粘着度合で評価する。高粘性のベタベタしたモルタルは鏝離れが悪く、作業性が不良となる。
(Characteristic evaluation method)
1) Flow value (mm):
According to the flow test of the physical test method of JIS R 5201 cement.
2) Water retention (mm):
5A filter paper (diameter 11 cm) specified in JIS P 3801 is placed on a polished plate glass with a thickness of 5 mm, and a ring mold (made of brass, inner diameter 50 mm, height 10 mm, thickness 3 mm) is installed at the center. The kneaded mortar is smoothly packed into the mold. Immediately after that, a filter paper and a glass plate are put on the upper part of the ring form and turned upside down to stand still. Measure the length of the water spread to the upper filter paper after 5 minutes and the length in the direction perpendicular to the direction up to 1 mm using a scale, and determine the average length of the measured values in the two directions as water retention. To do.
3) Surface state of the undercoat (unevenness state) and surface state of the finished heel presser (smoothness):
Take the mortar that has been kneaded on a iron board, rub it against the concrete wall and floor using a plastering iron with sufficient iron pressure (ground rub), and blend the groundwork with the cement composition, then undercoat Is applied once to a thickness of 10 mm, and the uneven state of the mortar surface is observed.
Next, the moisture (watering) state of the undercoated mortar surface is confirmed, and the surface of the undercoated mortar is pressed with a finishing trowel to confirm the finished smooth state.
4) Water float on the surface after painting:
Using a mechanical kneader of JIS R 5201 cement physical test method, 1 kg of a sample is put into a kneading bowl, and the kneading water is poured in such an amount that an appropriate flow value can be obtained while starting the kneader for 3 minutes. mix. After the kneaded mortar surface is lightly leveled, it is allowed to stand in a kneading bowl and the presence or absence of water floating (bleeding water) on the mortar surface after 1 hour is confirmed.
5) Separation (workability):
The kneaded mortar is evaluated by the degree of adhesion and the degree of adhesion between the mortar and the trowel when it is applied to the wall and floor using a plastering iron. High-viscosity and sticky mortars are difficult to separate and workability is poor.
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(宇部普通ポルトランドセメント、ブレーン比表面積3300cm2/g)。
2)細骨材:
・珪砂 :7号珪砂(瓢屋製、粒度:<0.3mm、平均粒径=0.075mm)
・寒水石:日立寒水石製。
・炭カル:日立寒水石製。
3)保水剤:
・天然多糖類系保水剤(AVEBE社製 ATOCEL301)。
4)増粘剤:
・メトローズ系増粘剤(信越化学社製 SB30004YP)。
5)膨張材:
・石灰−石膏系膨張材(太平洋セメント社製 太平洋ジプカル)。
6)滑性骨材
・ろう石(埼玉鉱業製、粒度0.3〜100μm)
7)軽量骨材
・パーライトa(東邦パーライト社製 6F)。
・パーライトb(東邦パーライト社製 TM3)。
8)有機短繊維:
・ビニロン短繊維(クラレ社製 繊維長:6mm)。
The following materials were used.
1) Cement:
Portland cement (Ube ordinary Portland cement, Blaine specific surface area 3300 cm 2 / g).
2) Fine aggregate:
・ Silica sand: No. 7 silica sand (manufactured by Ashiya, particle size: <0.3 mm, average particle size = 0.075 mm)
・ Samsui: Made by Hitachi Sekisui.
・ Charcoal Cal: Made by Hitachi Suisui
3) Water retention agent:
-Natural polysaccharide water retaining agent (ATECEL301 manufactured by AVEBE).
4) Thickener:
Metros thickener (SB30004YP manufactured by Shin-Etsu Chemical Co., Ltd.)
5) Expansion material:
-Lime-gypsum-based expansion material (Pacific Gypcal made by Taiheiyo Cement).
6) Lubricant aggregate and wax stone (manufactured by Saitama Mining Co., Ltd., grain size 0.3-100 μm)
7) Lightweight aggregate, perlite a (6F, manufactured by Toho Perlite).
-Perlite b (TM3 manufactured by Toho Perlite).
8) Organic short fibers:
-Vinylon short fiber (Fiber length: 6 mm, manufactured by Kuraray Co., Ltd.).
[実施例1〜4及び比較例1〜4]
表1に示す成分を、ロッキングミキサを使用して混合し、セメント、細骨材及び混和材料からなるセメント組成物を得た。
[Examples 1 to 4 and Comparative Examples 1 to 4]
The components shown in Table 1 were mixed using a rocking mixer to obtain a cement composition composed of cement, fine aggregate and admixture.
温度20℃、相対湿度65%の条件下で、セメント組成物100質量部に対し、表1に示す混練水を加え、ホバートミキサーを用いて低速3分間混練し、混練物を調製した。
得られた混練物のフロー値、保水性、塗り付け後の表面粗さ、塗り付け後の表面の水浮き、鏝離れ(施工性)を評価した結果を表1に示す。
Under the conditions of a temperature of 20 ° C. and a relative humidity of 65%, kneading water shown in Table 1 was added to 100 parts by mass of the cement composition, and kneaded at a low speed for 3 minutes using a Hobart mixer to prepare a kneaded product.
Table 1 shows the results of evaluating the flow value, water retention, surface roughness after application, surface water float after application, and wrinkle separation (workability) of the obtained kneaded product.
保水剤と増粘剤とを含まない比較例1の場合、モルタルの保水性が悪く、また図3に示す通り、モルタル塗り付け後の下塗りの表面には凸凹が殆ど見られない(細細な状態)。 続いて、仕上げの鏝押えを行うと、鏝押えの過程で鏝が下塗りモルタルの表面に粘着しすぎ、鏝塗作業性が著しく低下して平滑な表面状態を形成できなかった。 In the case of Comparative Example 1 which does not contain a water retention agent and a thickener, the water retention of the mortar is poor, and as shown in FIG. Status). Subsequently, when finishing the heel presser, the heel sticked too much to the surface of the undercoat mortar during the heel pressering process, so that the glazing workability was remarkably lowered and a smooth surface state could not be formed.
保水剤のみを添加し、増粘剤を用いない比較例3の場合、保水剤と増粘剤との相乗効果による保水性の改善が得られず、また、モルタル表面からの水浮きが見られる。 In the case of Comparative Example 3 in which only the water retention agent is added and no thickening agent is used, improvement in water retention due to the synergistic effect of the water retention agent and the thickening agent cannot be obtained, and water floating from the mortar surface is observed. .
増粘剤のみを添加した比較例4の場合、モルタル塗り付け後の下塗りモルタルの表面状態が、図2に示すように凸凹が少なく(細な状態)、仕上げ鏝押えの時にべたつき感が強く、良好な作業性及び良好な仕上表面状態が得られにくい。 In the case of Comparative Example 4 in which only the thickener is added, the surface condition of the undercoat mortar after mortar application is less uneven (thin state) as shown in FIG. It is difficult to obtain good workability and good finish surface condition.
保水剤と増粘剤とを適正範囲で添加した実施例4の場合、モルタルの保水性は良好であり、また、図1に示すようにモルタル塗り付け後の下塗り表面に1.5〜3mm程度の微小な凸凹が多数形成されていた(粗な状態)。このように下塗りモルタルの表面に凸凹が多数形成されていると、次の鏝押え作業時に、良好な鏝離れ性が得られるとともに、平滑な仕上げ面が形成できる。さらに、モルタル表面からの水浮きも見られず、モルタル施工の下塗り〜仕上げ鏝押えの2段階の作業を通じて良好な鏝塗り作業性が得られた。 In the case of Example 4 in which a water retention agent and a thickener were added in an appropriate range, the water retention of the mortar is good, and the surface of the undercoat after mortar application is about 1.5 to 3 mm as shown in FIG. A large number of minute irregularities were formed (coarse state). Thus, when many unevenness | corrugations are formed in the surface of undercoat mortar, in the next wrinkle pressing operation, while being able to obtain a good releasability, a smooth finished surface can be formed. Furthermore, no water floating from the surface of the mortar was observed, and good glazing workability was obtained through the two-stage work of mortar construction undercoat to finishing trowel presser.
保水剤と増粘剤とを適正範囲で添加した実施例1〜3についても、モルタルの保水性が良好で、実施例4の場合と同様にモルタル塗り付け後の表面凹凸が数多く見られた。また、モルタル表面の水浮きは見られず、モルタルの下塗り〜仕上げ鏝押えの2段階の作業で良好な鏝塗り作業性が得られた。 Also about Examples 1-3 which added the water retention agent and the thickener in the appropriate range, the water retention of mortar was favorable and many surface irregularities after mortar application were seen like Example 4. Further, no water floating on the surface of the mortar was observed, and good glazing workability was obtained in two stages of mortar undercoating to finishing heel presser.
また、保水剤と増粘剤とを含む実施例1〜4と、保水剤と増粘剤とを含まない比較例1とを比較すると、実施例1〜4は練置き1時間後においても、フロー値、保水性の変化が非常に小さい。
保水剤と増粘剤とを適正範囲を超えて添加した比較例2の場合は、モルタルの保水性はさらに向上するものの、モルタルの粘性が高くなり過ぎて施工時の鏝離れ性が極度に悪化している。
Moreover, when Examples 1-4 containing a water retention agent and a thickener and the comparative example 1 which does not contain a water retention agent and a thickener are compared, Examples 1-4 are kneaded 1 hour later, Changes in flow value and water retention are very small.
In the case of Comparative Example 2 in which a water retention agent and a thickening agent are added beyond the appropriate range, the water retention of the mortar is further improved, but the viscosity of the mortar becomes too high and the separation property during construction is extremely deteriorated. is doing.
Claims (6)
前記保水剤がアミローゼとアミロペクチンとを含む天然多糖類を加工した化工澱粉であって、
前記保水剤の重合度が2000〜6500の範囲であって、
前記保水剤の乾燥状態での脂質含有量が0.3%以下であって、
セメント100質量部に対して前記保水剤が0.02〜0.18質量部であって、
前記増粘剤がメチルセルロース系増粘剤であって、
セメント100質量部に対して、前記増粘剤0.02〜0.18質量部であることを特徴とするセメント組成物。 Including cement, fine aggregate, water retention agent, thickener, expansion material, slipping aggregate, and lightweight aggregate ,
The water retention agent is a modified starch obtained by processing a natural polysaccharide containing amylose and amylopectin,
The degree of polymerization of the water retention agent is in the range of 2000 to 6500,
The lipid content in the dry state of the water retention agent is 0.3% or less,
The water retention agent to the cement 100 parts by a 0.02 to 0.18 parts by weight,
The thickener is a methylcellulose thickener,
Cement composition characterized by being 0.02-0.18 parts by mass of the thickener with respect to 100 parts by mass of cement.
セメント100質量部に対して、該膨張材3〜10質量部であるThe expansion material is 3 to 10 parts by mass with respect to 100 parts by mass of cement.
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, characterized by the above-mentioned.
セメント100質量部に対して、前記滑性骨材1〜10質量部である1 to 10 parts by mass of the above-mentioned sliding aggregate with respect to 100 parts by mass of cement
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
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