JP6372886B2 - Low whiteness self-leveling composition - Google Patents
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- JP6372886B2 JP6372886B2 JP2014266798A JP2014266798A JP6372886B2 JP 6372886 B2 JP6372886 B2 JP 6372886B2 JP 2014266798 A JP2014266798 A JP 2014266798A JP 2014266798 A JP2014266798 A JP 2014266798A JP 6372886 B2 JP6372886 B2 JP 6372886B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
本発明は、セルフレベリング組成物及びセルフレベリング材に関する。詳しくは、白華が発現し難い低白華性のセルフレベリング材が得られる低白華性のセルフレベリング組成物及び低白華性のセルフレベリング材に関する。 The present invention relates to a self-leveling composition and a self-leveling material. More specifically, the present invention relates to a low whiteness self-leveling composition and a low whiteness self-leveling material from which a low whiteness self-leveling material in which whiteness is hardly expressed is obtained.
建築用床仕上げ施工等に、高い流動性を備え、自己水平性（自己平滑性）を有するセルフレベリング材が使用されている。セルフレベリング材は、セメントや石膏等の水硬性物質と、細骨材と、セメント分散剤（流動化剤や減水剤を含む。）と、増粘剤と、凝結調整剤（凝結遅延剤又は凝結促進剤）とを含有する水硬性組成物を、水で混練してなる（例えば、特許文献１〜３参照。）。セルフレベリング材は、コンクリート製床下地の上面に２〜３０ｍｍ厚程度流し込み、板（トンボと呼ばれる板に手で持つための棒が付いた表面均し具を含む。）や左官鏝等でセルフレベリング材表面を薄く１ｍｍ〜３０ｍｍの厚みに引き均すことで表面が水平な床を形成する。形成された水平なセルフレベリング材表面に、通常Ｐタイルやフローリングなどの仕上げ材が施工される。 Self-leveling materials having high fluidity and self-leveling (self-smoothness) are used for building floor finishing construction and the like. Self-leveling materials include hydraulic materials such as cement and gypsum, fine aggregates, cement dispersants (including fluidizers and water reducing agents), thickeners, and setting modifiers (setting retarders or setting agents). A hydraulic composition containing a promoter is kneaded with water (for example, see Patent Documents 1 to 3). The self-leveling material is poured into the top surface of the concrete floor base to a thickness of 2 to 30 mm, and is self-leveling with a plate (including a surface leveling tool with a stick for holding by hand on a plate called a dragonfly) or a plasterer. A floor with a horizontal surface is formed by thinning the material surface to a thickness of 1 mm to 30 mm. A finishing material such as P tile or flooring is usually applied to the surface of the formed horizontal self-leveling material.
ところで、セルフレベリング材は高い流動性を備えるために、水セメント比が高く、セメント分散剤等が含有されていることから、凝結時間が数時間以上と長いことがある。このため、セルフレベリング材表面に、白い析出物（白華）が生じる白華現象が起こることがある。この白華は、セメントの水和により生成した水酸化カルシウムが空気中の二酸化炭素と反応し、炭酸カルシウムを主成分とする白色の析出物が析出したものである。この白華には、炭酸カルシウム以外に、水酸化カルシウム、石膏、硫酸ナトリウムが含まれることもある。白華が生じると、見苦しいだけではなく、セルフレベリング材表面（上面）に貼り付けられる仕上げ材が剥離し易いという問題がある。セルフレベリング材表面（上面）に白華が多く発生すると、セルフレベリング材表面に仕上げ材を貼り付けの前に、発生した白華をポリッシャーなどで削り取る工程が追加される。そこで、セルフレベリング材としての性能（セルフレベリング性）は保有しながら、白華現象が起こり難いセルフレベリング材が得られる技術が求められている。 By the way, since the self-leveling material has high fluidity, the water cement ratio is high, and since the cement dispersant and the like are contained, the setting time may be as long as several hours or more. For this reason, the white flower phenomenon which white deposit (white flower) produces on the self-leveling material surface may occur. In this white flower, calcium hydroxide produced by hydration of cement reacts with carbon dioxide in the air, and white precipitates mainly composed of calcium carbonate are deposited. In addition to calcium carbonate, this white flower may contain calcium hydroxide, gypsum, and sodium sulfate. When white flower occurs, not only is it unsightly, but there is a problem that the finishing material attached to the surface (upper surface) of the self-leveling material is easily peeled off. When a large amount of white flower is generated on the surface (upper surface) of the self-leveling material, a step of scraping the generated white flower with a polisher or the like is added before applying the finishing material to the surface of the self-leveling material. Therefore, there is a need for a technique that can provide a self-leveling material that does not easily cause a white flower phenomenon while retaining the performance (self-leveling property) as a self-leveling material.
本発明は前記問題の解決、即ち、本発明は、セルフレベリング性は保有しながら、白華現象が起こり難いセルフレベリング材組成物を提供することを目的とする。また、本発明は、セルフレベリング性は保有しながら、白華現象が起こり難いセルフレベリング材を提供することを目的とする。 An object of the present invention is to provide a self-leveling material composition that solves the above-mentioned problems, that is, the self-leveling property, and that does not easily cause a white flower phenomenon. Another object of the present invention is to provide a self-leveling material that has a self-leveling property and is less prone to white flower phenomenon.
本発明者は、前記課題解決のため鋭意検討した結果、セメント、無機質微粉末、細骨材、無水石膏、増粘剤、減水剤、収縮低減剤及び消泡剤を特定割合で含有することにより、上記課題を解決できることを見出し、本発明を完成させた。即ち、本発明は、以下の（１）で表すセルフレベリング材組成物及び（２）で表すセルフレベリング材である。
（１） セメント２８〜３５質量％、無機質微粉末１０〜２０質量％及び細骨材５０〜５３質量％を含有し、更に、セメント１００質量部に対し、非晶質アルミノ珪酸鉱物粉末３．０〜８．０質量部、無水石膏２．５〜１０質量部、増粘剤０．０５〜１．０質量部、セメント分散剤０．５〜３．５質量部、及び消泡剤０．０５〜１．０質量部を含有するセルフレベリング材組成物。
（２）上記（１）のセルフレベリング材組成物と、該セルフレベリング材組成物１００質量部に対し、水２４〜２８質量部とを含有することを特徴とするセルフレベリング材。
As a result of diligent investigations for solving the above problems, the present inventor has included cement, inorganic fine powder, fine aggregate, anhydrous gypsum, thickener, water reducing agent, shrinkage reducing agent and antifoaming agent at a specific ratio. The inventors have found that the above problems can be solved, and have completed the present invention. That is, this invention is the self-leveling material composition represented by the following (1) and the self-leveling material represented by (2).
(1) 28 to 35% by mass of cement, 10 to 20% by mass of fine inorganic powder, and 50 to 53% by mass of fine aggregate, and further, amorphous aluminosilicate mineral powder 3.0 with respect to 100 parts by mass of cement. -8.0 parts by weight, anhydrous gypsum 2.5-10 parts by weight, thickener 0.05-1.0 parts by weight, cement dispersant 0.5-3.5 parts by weight, and defoamer 0.05 Self-leveling material composition containing -1.0 part by mass.
(2) A self-leveling material comprising the self-leveling material composition of (1) above and 24-28 parts by mass of water with respect to 100 parts by mass of the self-leveling material composition.
本発明によれば、セルフレベリング性は保有しながら、白華現象が起こり難いセルフレベリング材組成物が得られる。本発明によれば、セルフレベリング性は保有しながら、白華現象が起こり難いセルフレベリング材が得られる。また、本発明によれば、白華が起こり難いのでコンクリートの替わりとして打設することが出来るプレミックスグラウト組成物が得られる。 According to the present invention, it is possible to obtain a self-leveling material composition that retains the self-leveling property and hardly causes the white flower phenomenon. According to the present invention, it is possible to obtain a self-leveling material that retains self-leveling properties and is less likely to cause a white flower phenomenon. Further, according to the present invention, a premix grout composition that can be placed in place of concrete because white flower hardly occurs can be obtained.
本発明に用いるセメントは、水硬性セメントであればよく、例えば普通、早強、超早強、低熱及び中庸熱の各種ポルトランドセメント、エコセメント及びポルトランドセメントに含まれないビーライトセメント等のケイ酸カルシウム鉱物を主成分とするセメント（ケイ酸カルシウム鉱物を５０質量％以上含むセメント）、並びに、これらのケイ酸カルシウム鉱物を主成分とするセメントに、フライアッシュ、高炉スラグ粉末、シリカフューム又は石灰石微粉末等を混合した各種混合セメント、太平洋セメント社製「スーパージェットセメント」（商品名）や住友大阪セメント社製「ジェットセメント」（商品名）等の超速硬セメント、アルミナセメント等が挙げられ、これらの一種又は二種以上を使用することができる。ワービリティを損ない難く可使時間が長く確保し易いことから、各種ポルトランドセメント、エコセメント及び各種混合セメントから選ばれる一種又は二種以上を使用することが好ましい。また、本発明のセルフレベリング材組成物には、セメントを２８〜３５質量％含有させることが、白華現象及び凝結遅延が起き難く且つ乾燥ひび割れも起き難いことから好ましい。セメントの含有率が２８質量％未満では、凝結遅延による白華現象が起き易くなる。また、セメントの含有率が３５質量％を超えると、乾燥収縮によるひび割れが発生し易い。 The cement used in the present invention may be a hydraulic cement, for example, ordinary, early strength, ultra-early strength, low heat and moderate heat Portland cement, eco-cement, and belite cement not included in Portland cement. Cement containing calcium mineral as a main component (cement containing 50 mass% or more calcium silicate mineral), and cement containing these calcium silicate minerals as main components, fly ash, blast furnace slag powder, silica fume, or limestone fine powder Etc., various super-hard cements such as “Super Jet Cement” (trade name) manufactured by Taiheiyo Cement Co., Ltd., “Jet Cement” (trade name) manufactured by Sumitomo Osaka Cement Co., etc. One kind or two or more kinds can be used. It is preferable to use one or two or more selected from various Portland cements, eco-cements, and various mixed cements because it is difficult to impair the workability and it is easy to ensure a long pot life. In addition, it is preferable that the self-leveling material composition of the present invention contains 28 to 35% by mass of cement because the white flower phenomenon and the setting delay are less likely to occur and dry cracking is less likely to occur. If the cement content is less than 28% by mass, the white flower phenomenon due to setting delay is likely to occur. On the other hand, if the cement content exceeds 35% by mass, cracks due to drying shrinkage tend to occur.
本発明に用いる無機質微粉末としては、不溶性又は難溶性のセメント以外の無機質の微粉末を用いることができる。例えば、フライアッシュ、高炉スラグ粉末、シリカフューム、石灰石微粉末等の石粉等が好適な例として挙げられる。ここでいう微粉末とは、粒径１５０μｍ以下の粒子をいう。無機質微粉末の含有率は、１０〜２０質量％とすることが、白華現象及び凝結遅延が起き難いことから好ましい。１０質量％未満では、相対的にセメント量が増大するので乾燥収縮によるひび割れが発生し易い。また、２０質量％を超えると、相対的にセメント量が減少するので、凝結遅延による白華現象が起き易くなる。 As the inorganic fine powder used in the present invention, an inorganic fine powder other than insoluble or hardly soluble cement can be used. Examples of suitable examples include fly ash, blast furnace slag powder, silica fume, and fine limestone powder. The fine powder here refers to particles having a particle size of 150 μm or less. The content of the inorganic fine powder is preferably 10 to 20% by mass because the white flower phenomenon and the setting delay are difficult to occur. If it is less than 10% by mass, the amount of cement is relatively increased, so that cracks due to drying shrinkage tend to occur. On the other hand, when the amount exceeds 20% by mass, the amount of cement is relatively reduced, so that the white flower phenomenon due to setting delay tends to occur.
本発明に用いる細骨材としては、特に限定されず、例えば、川砂、陸砂、海砂、砕砂、珪砂、人工細骨材、スラグ細骨材などを用いることができる。本発明のセルフレベリング材組成物には、細骨材を５０〜５３質量％含有させることが、白華現象及び凝結遅延が起き難く且つ乾燥収縮によるひび割れも起き難いことから好ましい。細骨材の含有率が５０質量％未満では、凝結遅延及び白華現象が起き易くなる。また、細骨材の含有率が５３質量％を超えると、乾燥収縮によるひび割れが発生し易い。 The fine aggregate used in the present invention is not particularly limited, and for example, river sand, land sand, sea sand, crushed sand, quartz sand, artificial fine aggregate, slag fine aggregate and the like can be used. It is preferable that the self-leveling material composition of the present invention contains 50 to 53 mass% of fine aggregate because the white flower phenomenon and the setting delay are less likely to occur and cracking due to drying shrinkage is less likely to occur. When the content of the fine aggregate is less than 50% by mass, the setting delay and the white flower phenomenon easily occur. Moreover, when the content rate of a fine aggregate exceeds 53 mass%, the crack by dry shrinkage will generate | occur | produce easily.
また、本発明に用いる非晶質アルミノ珪酸鉱物粉末とは、ＳｉＯ２及びＡｌ２Ｏ３を主要化学成分として含有する鉱物のうち非晶質のものである。ここでいう非晶質とは、粉末Ｘ線回折装置による測定で、ピークが見られなくなることをいい、本発明に用いる非晶質アルミノ珪酸鉱物粉末は非晶質の割合が７０質量％以上であればよく、好ましくは９０質量％以上、より好ましくは１００％即ち粉末Ｘ線回折装置による測定でピークが全く見られないものが最も好ましい。非晶質の割合が低いアルミノ珪酸鉱物粉末、即ち結晶質の割合が高いアルミノ珪酸鉱物粉末は、非晶質の割合が高いアルミノ珪酸鉱物粉末に比べて、同じ混和量における強度発現性が悪く、白華を抑えるためにはより多くのアルミノ珪酸鉱物粉末を必要とする。本発明において、非晶質アルミノ珪酸鉱物粉末はセルフレベリング材の強度発現性を早めることにより、白華の発生を抑える。本発明に用いる非晶質アルミノ珪酸鉱物粉末には、ＳｉＯ２及びＡｌ２Ｏ３以外に、ＴｉＯ２、Ｆｅ２Ｏ３、ＣａＯ、ＭｇＯ、Ｋ２Ｏ、Ｎａ２Ｏ等の微量成分が含まれていても良い。本発明に用いる非晶質アルミノ珪酸鉱物粉末は、ＳｉＯ２及びＡｌ２Ｏ３を主要化学成分として含有する結晶質のアルミノ珪酸鉱物を加熱し非晶質化した非晶質アルミノ珪酸鉱物を粉末にすることによって得られる。加熱による非晶質化の前に粉末にしても良い。ここで用いる結晶質のアルミノ珪酸鉱物は、鉱物中に結晶水や水酸基が含まれていても良い。本発明に用いる非晶質アルミノ珪酸鉱物粉末としては、カオリナイト、ハロサイト、ディッカイト等のカオリン鉱物を加熱し非晶質化した非晶質アルミノ珪酸鉱物の粉末が、化学成分が比較的安定したものを入手し易く、混和したセルフレベリング材の物性が比較的安定することから好ましい。アルミノ珪酸鉱物の非晶質化のための加熱としては、外熱キルン、内熱キルン、電気炉等による焼成、及び溶融炉を用いた溶融等が挙げられる。本発明における非晶質アルミノ珪酸鉱物粉末の含有量は、セメント１００質量部に対し３．０〜８．０質量部とすることが白華現象が起き難くいことから好ましい。３．０質量部未満では、白華低減効果が認められず、８．０質量部を超えると粘性が増し作業性が低下するため、セルフレベリング性が得られなくなる虞がある。 The amorphous aluminosilicate mineral powder used in the present invention is an amorphous one of minerals containing SiO 2 and Al 2 O 3 as main chemical components. The term “amorphous” as used herein means that no peak is observed in the measurement by a powder X-ray diffractometer. The amorphous aluminosilicate mineral powder used in the present invention has an amorphous ratio of 70% by mass or more. What is necessary is just 90 mass% or more, More preferably, it is 100%, More preferably, the thing by which a peak is not seen at all by the measurement by a powder X-ray diffractometer is most preferable. Aluminosilicate mineral powder with a low proportion of amorphous, that is, aluminosilicate mineral powder with a high proportion of crystalline, has poor strength development at the same mixing amount compared to aluminosilicate mineral powder with a high proportion of amorphous, More aluminosilicate mineral powder is required to suppress white flower. In the present invention, the amorphous aluminosilicate mineral powder suppresses the occurrence of white flower by increasing the strength development of the self-leveling material. In addition to SiO 2 and Al 2 O 3 , the amorphous aluminosilicate mineral powder used in the present invention contains trace components such as TiO 2 , Fe 2 O 3 , CaO, MgO, K 2 O, and Na 2 O. May be. The amorphous aluminosilicate mineral powder used in the present invention is obtained by heating a crystalline aluminosilicate mineral containing SiO 2 and Al 2 O 3 as main chemical components into an amorphous state. It is obtained by doing. It may be made into a powder before amorphization by heating. The crystalline aluminosilicate mineral used here may contain crystal water or a hydroxyl group in the mineral. As the amorphous aluminosilicate mineral powder used in the present invention, the amorphous aluminosilicate mineral powder obtained by heating kaolin mineral such as kaolinite, halosite, dickite and the like to be amorphous has a relatively stable chemical component. It is preferable because it is easily available and the physical properties of the mixed self-leveling material are relatively stable. Examples of the heating for making the aluminosilicate mineral amorphous include firing with an external heat kiln, internal heat kiln, electric furnace, etc., melting with a melting furnace, and the like. The content of the amorphous aluminosilicate mineral powder in the present invention is preferably 3.0 to 8.0 parts by mass with respect to 100 parts by mass of the cement because the white flower phenomenon hardly occurs. If the amount is less than 3.0 parts by mass, the white flower reduction effect is not recognized. If the amount exceeds 8.0 parts by mass, the viscosity increases and the workability decreases, so that the self-leveling property may not be obtained.
本発明に用いる無水石膏としては、特に限定されず、何れの無水石膏でも使用することができる。本発明に使用する無水石膏としては、II型無水石膏が強度発現性の向上および乾燥収縮の低減に効果的であることから好ましい。無水石膏の含有量は、セメント１００質量部に対し２．５〜１０質量部とすることが、乾燥収縮によるひび割れも起き難く且つ遅れ膨張による罅割れや浮き等の不具合が起こり難いことから好ましい。２．５質量部未満では乾燥収縮低減の効果が認められず、１０質量部を超えると遅れ膨張（施工後に起こる膨張）と呼ばれる現象が起こる虞がある。遅れ膨張が発生すると、硬化したセルフレベリング材が罅割れることやコンクリート製床下地との間に隙間が生じる浮きと呼ばれる症状が発生する虞が高くなる The anhydrous gypsum used in the present invention is not particularly limited, and any anhydrous gypsum can be used. As anhydrous gypsum used in the present invention, type II anhydrous gypsum is preferable because it is effective in improving strength development and reducing drying shrinkage. The content of anhydrous gypsum is preferably 2.5 to 10 parts by mass with respect to 100 parts by mass of cement because cracks due to drying shrinkage hardly occur and problems such as cracking and floating due to delayed expansion hardly occur. If it is less than 2.5 parts by mass, the effect of reducing drying shrinkage is not recognized, and if it exceeds 10 parts by mass, a phenomenon called delayed expansion (expansion occurring after construction) may occur. When delayed expansion occurs, there is a high risk that a hardened self-leveling material will crack and a symptom called floating that creates a gap with the concrete floor substrate will occur.
本発明に用いる増粘剤としては、例えばヒドロキシエチルセルロース（ＨＥＣ）、ヒドロキシプロピルセルロース（ＨＰＣ）等のヒドロキシアルキルセルロース、或いは、ヒドロキシエチルメチルセルロース(ＨＥＭＣ)、ヒドロキシプロピルメチルセルロース(ＨＰＭＣ)、ヒドロキシエチルエチルセルロース(ＨＥＥＣ)等のヒドロキシアルキルアルキルセルロース等の水溶性セルロース；アルギン酸、β−１，３グルカン、プルラン、ウェランガム等の多糖類；アクリル樹脂やポリビニルアルコール等のポリビニル化合物；メチルスターチ，エチルスターチ，プロピルスターチ又はメチルプロピルスターチ等のアルキルスターチ、ヒドロキシエチルスターチ又はヒドロキシプロピルスターチ等のヒドロキシアルキルスターチ、或いは、ヒドロキシプロピルメチルスターチ等のヒドロキシアルキルアルキルスターチ等スターチエーテル等が挙げられ、これらの一種又は二種以上の使用が可能である。また、本発明に用いる増粘剤としては、少ない量で材料分離を防止でき且つ乾燥収縮によるひび割れも起き難くいことから、水溶性セルロースが好ましい。また、本発明に使用する増粘剤としては、低粘性タイプのものが、非晶質アルミノ珪酸鉱物粉末と併用したときの粘性が抑えられて作業性が高いことから好ましい。ここで、低粘性タイプの増粘剤とは、２０℃における２％水溶液の粘度４０００ｍＰａ・ｓ以下の増粘剤のことをいう。例えば、信越化学工業社製の水溶性セルロースエーテル系増粘剤の場合は、粘度グレード４０００以下の増粘剤をいう。増粘剤の含有量は、流動性が確保し易いこと及び材料分離抵抗性が得られることから、セメント１００質量部に対し０．０５〜１．０質量部とする。０．０５質量部未満では増粘剤を含有する効果が得られ難く材料分離抵抗性が低い。また、１．０質量部を超えると、低温環境下で粘性が高まるため作業性が悪くなる虞がある。 Examples of the thickener used in the present invention include hydroxyalkyl celluloses such as hydroxyethyl cellulose (HEC) and hydroxypropyl cellulose (HPC), or hydroxyethyl methyl cellulose (HEMC), hydroxypropyl methyl cellulose (HPMC), and hydroxyethyl ethyl cellulose (HEEC). Water-soluble cellulose such as hydroxyalkyl alkyl cellulose; polysaccharides such as alginic acid, β-1,3 glucan, pullulan and welan gum; polyvinyl compounds such as acrylic resin and polyvinyl alcohol; methyl starch, ethyl starch, propyl starch or methyl Alkyl starch such as propyl starch, hydroxyalkyl starch such as hydroxyethyl starch or hydroxypropyl starch, or hydroxy Hydroxyalkyl alkyl starch such as starch ethers such as propyl starch and the like, it is possible to use alone or in combination. Further, as the thickener used in the present invention, water-soluble cellulose is preferable because material separation can be prevented with a small amount and cracking due to drying shrinkage hardly occurs. Moreover, as a thickener used for this invention, a low-viscosity type thing is preferable from the viscosity being suppressed when used together with an amorphous aluminosilicate mineral powder, and workability | operativity is high. Here, the low viscosity type thickener means a thickener having a viscosity of 4000 mPa · s or less of a 2% aqueous solution at 20 ° C. For example, in the case of a water-soluble cellulose ether thickener manufactured by Shin-Etsu Chemical Co., Ltd., it means a thickener having a viscosity grade of 4000 or less. The content of the thickener is 0.05 to 1.0 part by mass with respect to 100 parts by mass of cement because fluidity is easily secured and material separation resistance is obtained. If it is less than 0.05 part by mass, the effect of containing a thickener is difficult to obtain and the material separation resistance is low. Moreover, when it exceeds 1.0 mass part, since viscosity increases in a low temperature environment, there exists a possibility that workability | operativity may worsen.
また、本発明に用いるセメント分散剤としては、特に限定されず、減水剤、高性能減水剤、ＡＥ減水剤、高性能ＡＥ減水剤、流動化剤等を用いることができ、例えば、ポリカルボン酸塩系セメント分散剤、ナフタレンスルホン酸塩系セメント分散剤、メラミンスルホン酸塩系セメント分散剤及びリグニンスルホン酸塩系セメント分散剤が挙げられ、これらの１種又は２種以上を用いることができる。用いるセメント分散剤としては、高性能減水剤又は高性能ＡＥ減水剤を用いると、白華を抑制し易いことから好ましい。また、本発明に用いるセメント分散剤の含有量は、セメント１００質量部に対し、０．５〜３．５質量部とすることが、白華を抑制し易く且つセルフレベリング性を得易く、更に、１．５〜３質量部とすることがより好ましい。０．５質量部未満では、セルフレベリング材としての流動性を得るための水量が多く必要となり白華が発生し易くなる。また、３．５質量部を超えると、凝結遅延により白華が発生し易くなる。 Further, the cement dispersant used in the present invention is not particularly limited, and water reducing agents, high performance water reducing agents, AE water reducing agents, high performance AE water reducing agents, fluidizing agents, and the like can be used. For example, polycarboxylic acid Examples thereof include a salt-based cement dispersant, a naphthalene sulfonate-based cement dispersant, a melamine sulfonate-based cement dispersant, and a lignin sulfonate-based cement dispersant, and one or more of these can be used. As the cement dispersant to be used, it is preferable to use a high-performance water reducing agent or a high-performance AE water reducing agent because it is easy to suppress white flower. Further, the content of the cement dispersant used in the present invention is 0.5 to 3.5 parts by mass with respect to 100 parts by mass of cement, and it is easy to suppress white flower and easily obtain self-leveling properties. It is more preferable to set it as 1.5-3 mass parts. If the amount is less than 0.5 parts by mass, a large amount of water is required to obtain fluidity as a self-leveling material, and white flower tends to occur. Moreover, when it exceeds 3.5 mass parts, it will become easy to generate | occur | produce white flower by a setting delay.
本発明に用いる収縮低減剤としては、セルフレベリング材（モルタル）の硬化体中の水分が蒸発する際に発生する応力を低下させる機能を有する物質であれば良く、種類は限定されず、例えば、ポリオキシアルキレン化合物、ポリエーテル系化合物あるいはアルキレンオキシド化合物等を用いることができる。具体的には、ポリオキシエチレン・アルキルアリルエーテル、ポリプロピレングリコール、低級アルコールアルキレンオキシド付加物、グリコールエーテル・アミノアルコール誘導体、ポリエーテル、ポリオキシアルキレングリコール、エチレンオキシドメタノール付加物、エチレンオキシド・プロピレンオキシド重合体、フェニル・エチレンオキシド重合体、シクロアルキレン・エチレンオキシド重合体あるいはジメチルアミン・エチレンオキシド重合体等が好適なものとして例示される。これらは一種または二種以上を併用することができる。市販のセメント用、モルタル用、石膏用又はコンクリート用の収縮低減剤を好適なものとして用いることができる。本発明のセルフレベリング材組成物における収縮低減剤の含有量は、ひび割れが発生し難く且つ白華が起こり難いことから、セメント１００質量部に対し０．５〜２．０質量部とすることが好ましい。０．５質量部未満では収縮低減剤を含有させた効果が得られ難い。また、２．０質量部を超えると混和量を増大させたことによる効果は得られ難い。 The shrinkage reducing agent used in the present invention is not limited as long as it has a function of reducing the stress generated when moisture in the cured body of the self-leveling material (mortar) evaporates. A polyoxyalkylene compound, a polyether compound, an alkylene oxide compound, or the like can be used. Specifically, polyoxyethylene / alkyl allyl ether, polypropylene glycol, lower alcohol alkylene oxide adduct, glycol ether / amino alcohol derivative, polyether, polyoxyalkylene glycol, ethylene oxide methanol adduct, ethylene oxide / propylene oxide polymer, Preferred examples include phenyl / ethylene oxide polymers, cycloalkylene / ethylene oxide polymers, and dimethylamine / ethylene oxide polymers. These can be used alone or in combination of two or more. A commercially available shrinkage reducing agent for cement, mortar, gypsum, or concrete can be used as a suitable one. The content of the shrinkage reducing agent in the self-leveling material composition of the present invention is set to 0.5 to 2.0 parts by mass with respect to 100 parts by mass of cement because cracks are hardly generated and white flower is hardly generated. preferable. If it is less than 0.5 part by mass, it is difficult to obtain the effect of containing a shrinkage reducing agent. On the other hand, when the amount exceeds 2.0 parts by mass, it is difficult to obtain the effect of increasing the amount of mixing.
本発明のセルフレベリング材組成物に用いる消泡剤は、種類は限定されず、例えば、市販のセメント用消泡剤、市販のセメントモルタル用消泡剤又は市販のコンクリート用消泡剤の他、他用途の鉱物油系、エーテル系、シリコーン系等の消泡剤、トリブチルフォスフェート、ポリジメチルシロキサン又はポリオキシアルキレンアルキルエーテル系非イオン界面活性剤が好適な例として挙げられ、これらの１種又は２種以上を用いることができる。また、本発明に用いる消泡剤としては、液体のものでも粉末状のものでもよい。粉末状の消泡剤としては、液体消泡剤を、シリカ粉末等の無機質粉末に担持させて粉末状にしたものも用いることができる。本発明のセルフレベリング材組成物における消泡剤の含有量は、セメント１００質量部に対し０．０５〜１．０質量部とすることが、セルフレベリング材の表面が平滑で且つ白華が起こり難いことから好ましい。０．０５質量部未満では消泡効果がほとんど得られない。また、１．０質量部を超えると混和量を増大させたことによる効果は得られ難い。 The type of antifoaming agent used in the self-leveling material composition of the present invention is not limited. For example, in addition to a commercially available antifoaming agent for cement, a commercially available antifoaming agent for cement mortar, or a commercially available antifoaming agent for concrete, Antifoaming agents such as mineral oil-based, ether-based, silicone-based, etc., tributyl phosphate, polydimethylsiloxane or polyoxyalkylene alkyl ether-based nonionic surfactants for other uses can be mentioned as suitable examples, Two or more kinds can be used. In addition, the antifoaming agent used in the present invention may be liquid or powdery. As the powdered antifoaming agent, a powdered antifoaming agent supported on an inorganic powder such as silica powder can be used. The content of the antifoaming agent in the self-leveling material composition of the present invention is 0.05 to 1.0 part by mass with respect to 100 parts by mass of the cement, and the surface of the self-leveling material is smooth and white bloom occurs. It is preferable because it is difficult. If it is less than 0.05 parts by mass, the defoaming effect is hardly obtained. On the other hand, when the amount exceeds 1.0 part by mass, it is difficult to obtain the effect of increasing the amount of mixing.
本発明のセルフレベリング材組成物には、上記セメント、細骨材、非晶質アルミノ珪酸鉱物粉末や無水石膏等の無機質微粉末、増粘剤、セメント分散剤、収縮低減剤及び消泡剤以外に、他の混和材料又は粗骨材から選ばれる一種又は二種以上を本発明の効果を実質損なわない範囲で併用することができる。この混和材料としては、例えばセメント用ポリマー、防水材（剤）、防錆剤、保水剤、顔料、繊維、撥水剤、急結剤（材）、急硬剤（材）、凝結遅延剤、表面硬化剤、膨張材、発泡剤等が挙げられる。また、本発明で使用される混和材料は、粉末状でも液状でも使用可能であるが、液状の混和材料の場合には、他の粉体又は顆粒状の成分（担体）に吸着させ見かけ上粉体状又は顆粒状とした上で用いることが好ましい。ここで用いる担体としては、シリカ粉末等の他、セメント、骨材或いは粉末状又は顆粒状の混和材料を用いてもよい。また、粗骨材としては、例えば川砂利、陸砂利、海砂利、砕石、人工粗骨材、スラグ粗骨材等が挙げられる。 The self-leveling material composition of the present invention includes the above-mentioned cement, fine aggregate, inorganic fine powder such as amorphous aluminosilicate mineral powder and anhydrous gypsum, thickener, cement dispersant, shrinkage reducing agent and antifoaming agent. In addition, one or more kinds selected from other admixtures or coarse aggregates can be used in combination as long as the effects of the present invention are not substantially impaired. Examples of this admixture include polymers for cement, waterproofing agents (agents), rust preventives, water retention agents, pigments, fibers, water repellents, quick setting agents (materials), quick hardening agents (materials), setting retarders, A surface hardening agent, an expansion material, a foaming agent, etc. are mentioned. The admixture used in the present invention can be used in the form of powder or liquid, but in the case of liquid admixture, it is adsorbed on other powder or granular components (carrier) and apparently powder. It is preferable to use it after making it into a body or granule. As the carrier used here, in addition to silica powder and the like, cement, aggregate, or powder or granular admixture may be used. Examples of the coarse aggregate include river gravel, land gravel, sea gravel, crushed stone, artificial coarse aggregate, slag coarse aggregate, and the like.
本発明のセルフレベリング材組成物は、Ｖ型混合機や可傾式コンクリートミキサ等の重力式ミキサ、ヘンシェル式ミキサ、パドルミキサ、リボンミキサ等のミキサにより、所定量の上記各材料を予め混合する方が、添加後のセルフレベリング材組成物において材料の偏在が抑えられることから好ましい。このとき用いるミキサは、連続式ミキサでもバッチ式ミキサでも良い。各材料のミキサ内への投入順序は特に限定されない。一種ずつ添加してもよく、一部又は全部を同時に添加してもよい。また、袋やポリエチレン製容器等の容器に各材料を計り取り投入する方法により、本発明のセルフレベリング材組成物を製造することもできる。 The self-leveling material composition of the present invention is a method in which a predetermined amount of each of the above materials is mixed in advance using a V-type mixer, a gravitational mixer such as a tiltable concrete mixer, a Henschel mixer, a paddle mixer, a ribbon mixer or the like. However, it is preferable because uneven distribution of the material is suppressed in the self-leveling material composition after the addition. The mixer used at this time may be a continuous mixer or a batch mixer. The order in which each material is charged into the mixer is not particularly limited. One by one may be added, or part or all may be added simultaneously. Moreover, the self-leveling material composition of the present invention can also be produced by a method of measuring and introducing each material into a container such as a bag or a polyethylene container.
本発明のセルフレベリング材組成物は、セルフレベリング材組成物（粉体：Ｐ）１００質量部に対し２４〜２８質量部の水（Ｗ）と混練して用いる、即ち、水セルフレベリング材組成物（プレミックスモルタル、粉体）比（Ｗ／Ｐ）２４〜２８％とすることが好ましい。このときの水量は、水性の液状混和材料（例えば液体減水剤やゴムラテックス。）を添加する場合は、セルフレベリング材に添加する水性の液状混和材料に含まれる水の量も考慮する。２４質量部未満ではセルフレベリング材としての高い流動性が得られ難く、２８質量部を超えると材料分離を起こす虞が高まり、白華が起こる虞が高い。より流動性が高く且つ材料分離及び白華が起こり難いことから、セルフレベリング材組成物（粉体）１００質量部に対する水量は、２４〜２６質量部とすること、即ちＷ／Ｐ２４〜２６とすることがより好ましい。 The self-leveling material composition of the present invention is used by kneading with 24-28 parts by mass of water (W) with respect to 100 parts by mass of the self-leveling material composition (powder: P), that is, a water self-leveling material composition. The (premix mortar, powder) ratio (W / P) is preferably 24 to 28%. At this time, when adding an aqueous liquid admixture (for example, a liquid water reducing agent or rubber latex), the amount of water contained in the aqueous liquid admixture added to the self-leveling material is also taken into consideration. If it is less than 24 parts by mass, it is difficult to obtain high fluidity as a self-leveling material, and if it exceeds 28 parts by mass, there is a high possibility that material separation will occur, and there is a high possibility that white bloom will occur. Since the fluidity is higher and material separation and white flower are less likely to occur, the amount of water for 100 parts by mass of the self-leveling material composition (powder) is 24 to 26 parts by mass, that is, W / P 24 to 26. It is more preferable.
また、本発明のセルフレベリング材組成物に水を加え混練することでセルフレベリング材を製造する方法は、限定されず、例えば水に上記のセルフレベリング材組成物を全量加え混練する方法、水に上記のセルフレベリング材組成物を混練しながら加え更に混練する方法、水と水性の混和材料を合わせたものに上記のセルフレベリング材組成物を混練しながら加え更に混練する方法、水と水性の混和材料を合わせたものに及び上記のセルフレベリング材組成物のそれぞれ一部ずつを２以上に分けて混練したものを合わせて更に混練する方法等がある。また、混練に用いる器具や混練装置も好ましい器具や装置はあるものの特に限定されないが、ミキサを用いることが量を多く混練できるので好ましい。用いることのできるミキサとしては連続式ミキサでもバッチ式ミキサでも良く、例えば高速グラウトミキサ、ハンドミキサ等が挙げられる。 Further, the method for producing the self-leveling material by adding water to the self-leveling material composition of the present invention and kneading is not limited, for example, the method of adding the whole self-leveling material composition to water and kneading the water, A method of adding and kneading the above self-leveling material composition while kneading, a method of adding and kneading the above self-leveling material composition to a mixture of water and an aqueous admixture, and mixing water and aqueous. For example, there is a method in which a combination of materials and a part of each of the above-mentioned self-leveling material composition are kneaded into two or more and kneaded together. Further, although there are preferable tools and apparatuses for the kneading and devices used for kneading, there is no particular limitation, but it is preferable to use a mixer because a large amount can be kneaded. The mixer that can be used may be a continuous mixer or a batch mixer, and examples thereof include a high-speed grout mixer and a hand mixer.
本発明のセルフレベリング材は、上記の方法及び水量で、上記のセルフレベリング材組成物に対し水を混練したもの（モルタル）である。 The self-leveling material of the present invention is obtained by kneading water (mortar) with the above-described self-leveling material composition in the above method and amount of water.
［実施例１］
セメント、無機質微粉末、細骨材、非晶質アルミノ珪酸鉱物粉末、無水石膏、増粘剤、セメント分散剤、収縮低減剤及び消泡剤を表１に示す配合割合でセルフレベリング材組成物（プレミックスモルタル）を作製した。このときの使用材料を以下に示した。
＜使用材料＞
セメント：普通ポルトランドセメント（太平洋セメント社製）
無機質微粉末１： 高炉スラグ微粉末（ブレーン比表面積：４０００cm２／ｇ）
無機質微粉末２： アルミノ珪酸鉱物粉末（ＢＡＳＦジャパン社製焼成カオリン、商品名「メタマックス」、粉末Ｘ線回折装置による測定でピークが全く見られない（非晶質）。）
細骨材： 珪砂（山形県産）
セメント分散剤： ポリカルボン酸系高性能減水剤（市販品、粉末）
増粘剤： 水溶性セルロースエーテル系増粘剤（信越化学工業社製、粉末、低粘性タイプ；２０℃における２％水溶液の粘度４０００ｍＰａ・ｓ）
無水石膏： II型無水石膏（ブレーン比表面積８０００ｃｍ２／ｇ）
収縮低減剤： 粉末収縮低減剤「テトラガードＰＷ」（商品名）（太平洋マテリアル社製）
消泡剤： 粉末消泡剤「ＳＮデフォーマＡＨＰ」（商品名）（サンノプコ社製）
水： 上水道水（千葉県佐倉市）
[Example 1]
A self-leveling material composition (a mixture of cement, inorganic fine powder, fine aggregate, amorphous aluminosilicate mineral powder, anhydrous gypsum, thickener, cement dispersant, shrinkage reducing agent and antifoaming agent shown in Table 1) Premixed mortar) was prepared. The materials used at this time are shown below.
<Materials used>
Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement)
Inorganic fine powder 1: Blast furnace slag fine powder (Blaine specific surface area: 4000 cm 2 / g)
Inorganic fine powder 2: Aluminosilicate mineral powder (calcined kaolin manufactured by BASF Japan, trade name “Metamax”, no peak is observed by measurement with a powder X-ray diffractometer (amorphous))
Fine aggregate: quartz sand (from Yamagata Prefecture)
Cement dispersant: Polycarboxylic acid-based high-performance water reducing agent (commercially available, powder)
Thickener: Water-soluble cellulose ether thickener (Shin-Etsu Chemical Co., Ltd., powder, low-viscosity type; viscosity of 2% aqueous solution at 20 ° C. 4000 mPa · s)
Anhydrous gypsum: Type II anhydrous gypsum (Brain specific surface area 8000 cm 2 / g)
Shrinkage reducing agent: Powder shrinkage reducing agent “Tetragard PW” (trade name) (manufactured by Taiheiyo Materials Co., Ltd.)
Antifoaming agent: Powder antifoaming agent “SN Deformer AHP” (trade name) (manufactured by San Nopco)
Water: Tap water (Sakura City, Chiba Prefecture)
作製したセルフレベリング材組成物（プレミックスモルタル）と水を表１に示す割合でミキサで混練することでセルフレベリング材（モルタル）を作製し、作製したセルフレベリング材をの評価試験を行い、以下に示す通り、作業性の評価（流動性評価）、可使時間の評価、分離抵抗性の評価及び白華抑制性の評価を行った。これらの結果を表２に示した。
＜評価試験方法＞
・作業性の評価（流動性評価）
ＪＡＳＳ１５−１０３「セルフレベリング材の品質基準」に準じてフロー値を測定した。フロー値は１９０mm以上が当該基準の規格値となっており、この規格値を少し上回る状態（１９０mm以上２００mm未満）を「○」（良）、「○」の状態を上回り流動性がより良好な状態（２１０mm以上２３０mm未満）を「◎」（優良）、「○」および「◎」以外を「×」（不良）と評価した。
・可使時間の評価
練混ぜ終了（練り上がり）から３時間経過後に再度フロー値を測定し、練り上がり直後の値よりも１５％以上低下したものを「×」（不良）、５％以上１５％未満の低下のものを「○」（良）、及び低下しない又は５％未満の低下であったものを「◎」（優良）と評価した。
・分離抵抗性の評価
温度５℃で、作製したモルタルを内寸：縦１３ｃｍ×横８．５ｃｍ×高さ１．８ｃｍのプラスティック容器に厚さ１ｃｍとなるように流し込んだ。流し込み後３０分間放置したモルタル表面の状態（ブリーディング水発生の有無）を目視観察した。明らかにモルタル表面に水が浮かんでいるものを「×」（不良）、目視観察ではブリーディング水は観察されないが、表面を指で均すと若干ノロ分があるものを「○」（良）、ノロ分及び骨材沈降が全く見られないものを「◎」（優良）と評価した。ここで、「ノロ分」とは、細骨材と分離してセルフレベリング材上面に上昇したセメントペーストのことをいう。
・白華抑制性の評価（外観評価）
分離抵抗性の評価試験におけるモルタルの流し込みから１週間経過後に、白華の発生の有無及び色むら発生の有無を観察した。白華が発生した場合は、析出物を回収しその質量を測定した。色むらが無く且つ析出物も無いものを「◎」（優良）、白華が発生したが析出物の量が０．５ｇ未満のものを「○」（良）、白華が発生しその析出物の量が０．５ｇ以上のものを「×」（不良）と評価した。
A self-leveling material (mortar) was prepared by kneading the prepared self-leveling material composition (premix mortar) and water at a ratio shown in Table 1 with a mixer, and an evaluation test of the prepared self-leveling material was performed. As shown in Fig. 2, the workability (fluidity evaluation), the pot life, the separation resistance and the whiteness inhibiting property were evaluated. These results are shown in Table 2.
<Evaluation test method>
・ Evaluation of workability (liquidity evaluation)
The flow value was measured according to JASS15-103 “Quality Standard for Self-Leveling Material”. The flow value of 190 mm or more is the standard value of the standard, and the state of slightly exceeding this standard value (190 mm or more and less than 200 mm) is “◯” (good), exceeding the state of “○”, and the fluidity is better. The state (210 mm or more and less than 230 mm) was evaluated as “◎” (excellent), and “o” and “◎” other than “×” were evaluated as “poor”.
・ Evaluation of pot life The flow value was measured again after 3 hours from the end of kneading (kneading), and a value that was 15% or more lower than the value immediately after kneading was “x” (defect), 5% or more 15 Those with a decrease of less than% were evaluated as “◯” (good), and those with no decrease or less than 5% were evaluated as “◎” (excellent).
Evaluation of Separation Resistance At a temperature of 5 ° C., the produced mortar was poured into a plastic container having an internal size: length 13 cm × width 8.5 cm × height 1.8 cm to a thickness of 1 cm. The state of the mortar surface (presence of bleeding water generation) left for 30 minutes after pouring was visually observed. Obviously, water that floats on the surface of the mortar is marked with “×” (poor), but no bleeding water is observed by visual observation, but when the surface is leveled with a finger, it is slightly “no” (good), A sample in which no deposits and aggregate sedimentation were observed was evaluated as “◎” (excellent). Here, “noro” means a cement paste that is separated from the fine aggregate and rises to the upper surface of the self-leveling material.
・ Evaluation of white flower suppression (appearance evaluation)
One week after the mortar pouring in the separation resistance evaluation test, the presence or absence of white flower and the occurrence of uneven color was observed. When white flower was generated, the precipitate was collected and its mass was measured. “◎” (excellent) when no color unevenness and no precipitate were generated, white flower was generated, but “○” (good) was generated when the amount of precipitate was less than 0.5 g. A product having an amount of 0.5 g or more was evaluated as “x” (defective).
本発明の実施例に当たるセルフレベリング材組成物（本発明品１〜８）は、何れも、作業性の評価（流動性の評価）、可使時間の評価、分離抵抗性の評価及び白華抑制性の評価（外観評価）が、優良（◎）の評価であった。また、これらのセルフレベリング材組成物は、何れも、外観評価において乾燥収縮ひび割れは見られなかった。 The self-leveling material compositions (the present invention products 1 to 8) corresponding to the examples of the present invention all have an evaluation of workability (an evaluation of fluidity), an evaluation of pot life, an evaluation of separation resistance, and a whitening suppression. The evaluation of the property (appearance evaluation) was an excellent (優) evaluation. In addition, none of these self-leveling material compositions showed dry shrinkage cracks in appearance evaluation.
本発明のセルフレベリング材組成物は、建築構造物における床の下地調整材等に用いることができる。 The self-leveling material composition of the present invention can be used as a floor base material for a building structure.
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