JP2019178036A - Construction cement mortar for spraying - Google Patents

Construction cement mortar for spraying Download PDF

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JP2019178036A
JP2019178036A JP2018068648A JP2018068648A JP2019178036A JP 2019178036 A JP2019178036 A JP 2019178036A JP 2018068648 A JP2018068648 A JP 2018068648A JP 2018068648 A JP2018068648 A JP 2018068648A JP 2019178036 A JP2019178036 A JP 2019178036A
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mortar
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克夫 細野
Katsuo Hosono
克夫 細野
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Taiheiyo Materials Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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    • Y02W30/91Use of waste materials as fillers for mortars or concrete

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Abstract

To provide cement-based construction cement mortar that comprises high adhesive property adaptable to a spray method, and good constructing workability.SOLUTION: A construction cement mortar for spraying includes (A) Portland cement of 100 pts.mass, (B) a blast furnace slag fine powder and/or pozzolanic reactivity substance of 26 to 38 pts.mass, (C) gypsum of 4 to 12 pts.mass, (D) thickener of 0.2 to 0.4 pts.mass, (E) a humic acid and/or fulvic acid of 5 to 10 pts.mass and (F) a fine aggregate of 230 to 290 pts.mass. The construction cement mortar for spraying preferably includes a polymer cement mortar, and more preferably fiber.SELECTED DRAWING: None

Description

本発明は、吹付施工に適した建築モルタルに関する。   The present invention relates to a building mortar suitable for spray construction.

建築物の壁や天井等の構築部材として、或いは壁面等へのタイル張付け材等に使用されるセメント系モルタルは、施工面積が比較的広範囲な場合などでは、吹付工法で施工されることがある。吹付工法には、水を含む全てのモルタル構成成分を予め混練し、得られたスラリー状モルタルを吹付装置に圧送し、そのまま吹付ける乾式吹付工法と、水と多くの場合は液体成分を除いたモルタル構成成分を予め乾式混合し、この混合物を吹付機に圧送し、圧送途中で圧送物に注水及び注液をし、これを吹付ける湿式吹付工法がある。何れの吹付工法でも、モルタル吹付工法に適するセメント系モルタルは、良好な付着性の具備が不可欠である。吹付施工に適した付着強度を確保するには、モルタルの結合相を形成するセメントを急速に凝結させて、吹付物が変形や崩落する前に固結させてしまう手段と、強い粘着力で吹付物を接着させる手段がある。前者は例えば急結剤を配合することで得られ、後者は例えば増粘剤や他の特定のポリマーを配合することで得られる。   Cement-based mortars used as building members such as walls and ceilings of buildings, or tiled materials on wall surfaces, etc., may be constructed by spraying when the construction area is relatively wide. . In the spraying method, all mortar constituents including water are kneaded in advance, and the resulting slurry mortar is pumped to a spraying device and sprayed as it is, and water and in many cases liquid components are removed. There is a wet spraying method in which mortar components are dry-mixed in advance, the mixture is pumped to a sprayer, water is injected into the pumped product in the course of pumping, and the resulting liquid is sprayed. In any spraying method, cement-based mortar suitable for the mortar spraying method must have good adhesion. In order to ensure adhesion strength suitable for spraying construction, the cement that forms the mortar's binder phase is rapidly agglomerated and solidified before the sprayed material is deformed or collapsed. There is a means to adhere objects. The former can be obtained, for example, by blending a quick setting agent, and the latter can be obtained, for example, by blending a thickener or other specific polymer.

急結剤を使用したモルタルは、急激に硬化が進むため吹付後の仕上調整が実質不可能であり、また急結剤配合物は注水後の練り置きができない等、施工作業面での制約が多いため、建築物への適用は限定的である。増粘剤を使用したモルタルで、十分安定な付着性を得るには、高粘性の増粘剤選定や、使用量を多くせねばならない。これは、吹付時のモルタル圧送性低下や混合抵抗上昇による混合不足に繋がり、施工が不安定になり、均質な吹付施工物が得難くなる。また、増粘剤以外のポリマーとしては、主にポリマーモルタルセメント用ポリマーとして知られているポリマーディスパーションや再乳化型粉末樹脂が使用されている。(例えば、特許文献1〜3参照。)しかし、施工作業面で制約の多いエポキシ系ポリマーなど硬化の特に早い一部のポリマー以外のポリマーでは、概して付着力が高くないため、大量に配合使用しないと吹付に適した付着性が得難い。一方で、ポリマーの大量配合は強度低下、垂れが生じる虞及びポンプ圧送性の低下の虞がある。 Mortars that use quick setting agents are hardened rapidly, so finishing adjustment after spraying is virtually impossible, and quick setting compounds cannot be kneaded after water injection. Because there are many, application to buildings is limited. In order to obtain sufficiently stable adhesion with a mortar using a thickener, it is necessary to select a thickener with a high viscosity and to use a large amount. This leads to insufficient mixing due to reduced mortar pumpability and increased mixing resistance during spraying, making the work unstable and making it difficult to obtain a uniform sprayed work. Moreover, as a polymer other than the thickener, a polymer dispersion or a re-emulsifying powder resin known mainly as a polymer for polymer mortar cement is used. (For example, refer to Patent Documents 1 to 3.) However, polymers other than some polymers that are particularly fast-curing, such as epoxy-based polymers that have many restrictions in terms of construction work, generally do not have high adhesion, and are not used in large quantities. Adhesion suitable for spraying is difficult to obtain. On the other hand, when a large amount of the polymer is blended, there is a risk that strength is lowered, sagging occurs, and pumpability is lowered.

特開平11−322390号公報JP-A-11-322390 特開2015−127284号公報JP, 2015-127284, A 特開2011−207639号公報JP 2011-207639 A

本発明は、セメント系モルタルにおいて、高い付着性確保のための前述のような成分配合による問題点の解消を課題とするものであり、吹付装置を介した圧送路で良好な流動性を呈し、混合性も良好で、吹付時の粘着性も良好で、吹付後はしまりの早い特性により、モルタル施工物の液垂れや剥離・剥落の抑制が十分できる吹付施工に適した建築モルタルの提供を課題とする。   The present invention, in cement-based mortar, is intended to solve the problems caused by the above-described component blending to ensure high adhesion, exhibits good fluidity in the pressure feed path through the spraying device, Providing building mortar suitable for spray construction that has good mixing properties, good tackiness during spraying, and can prevent dripping, peeling, and peeling off of mortar construction due to its fast-clogging property after spraying And

本発明者は、特定量のポルトランドセメントと、高炉スラグ微粉及び/又はポゾラン反応性物質と、石膏類と、増粘剤と、細骨材との含有物に、フミン酸及び/又はフルボ酸を加えたモルタルが良好な混合性を呈し、吹付まで圧送に適した流動状態が得やすく、吹付後、モルタルのしまりが早い特性が、液垂れ抑制や崩落抑止効果をもたらし、作業性が向上したモルタル質の吹付施工物が得られたことから、本発明を完成した。                     The present inventor added humic acid and / or fulvic acid to a specific amount of Portland cement, blast furnace slag fine powder and / or pozzolanic reactive material, gypsum, thickener, and fine aggregate. The added mortar has good mixing properties, and it is easy to obtain a flow state suitable for pumping until spraying. The characteristics of the mortar being fast after spraying have the effect of suppressing dripping and collapsing and improving workability. Since the quality sprayed construction was obtained, the present invention was completed.

即ち、本発明は、次の発明〔1〕〜〔4〕を提供するものである。   That is, the present invention provides the following inventions [1] to [4].

〔1〕(A)ポルトランドセメント100質量部、(B)高炉スラグ微粉及び/又はポゾラン反応性物質26〜38質量部、(C)石膏類4〜12質量部、(D)増粘剤0.2〜0.4質量部、(E)フミン酸及び/又はフルボ酸5〜10質量部および(F)細骨材230〜290質量部を含有する吹付用建築モルタル。
〔2〕さらに、(G)ポリマーセメントモルタル用ポリマーを含有する前記〔1〕に記載の吹付用建築モルタル。
〔3〕さらに、(H)繊維を含有する前記〔1〕又は〔2〕に記載の吹付用建築モルタル。
〔4〕細骨材が、無機質軽量細骨材含有率5質量%以下(0質量%を含む。)の細骨材である前記〔1〕〜〔3〕の何れかに記載の吹付用建築モルタル。
[1] (A) 100 parts by weight of Portland cement, (B) 26 to 38 parts by weight of blast furnace slag fine powder and / or pozzolanic reactive material, (C) 4 to 12 parts by weight of gypsum, (D) thickener 0. Architectural mortar for spraying containing 2 to 0.4 parts by mass, (E) 5 to 10 parts by mass of humic acid and / or fulvic acid, and (F) 230 to 290 parts by mass of fine aggregate.
[2] The architectural mortar for spraying according to [1], further including (G) a polymer for polymer cement mortar.
[3] The architectural mortar for spraying according to [1] or [2], further including (H) fiber.
[4] The spray building according to any one of [1] to [3], wherein the fine aggregate is a fine aggregate having an inorganic light-weight fine aggregate content of 5% by mass or less (including 0% by mass). mortar.

本発明により得られる吹付用建築モルタルは、吹付装置を介した吹付施工に於いて、従来の建築用吹付モルタルや建築タイル張付用モルタルなどよりも遙かに少ない増粘剤やポリマーの配合量であっても、早いしまりにより良好な付着性が得られる。吹付圧送性に適した良好な流動性と良好な混合性の基で、吹付施工物の液垂れ抑制や剥落防止が十分なされた施工物を得ることができる。また、本発明の吹付用建築モルタルは、例えば乾式吹付工法及び湿式吹付工法の何れにも使用でき、施工工法を制限しない。   The building mortar for spraying obtained by the present invention is a blending amount of a thickener and a polymer that is far less than conventional building spraying mortar and building tile mortar in spraying construction through a spraying device. Even so, good adhesion can be obtained due to the early tightening. Based on the good fluidity and good mixing properties suitable for the spraying and pumping property, it is possible to obtain a construction in which dripping suppression and peeling prevention of the sprayed construction are sufficient. Moreover, the building mortar for spraying of this invention can be used for any of a dry-type spraying method and a wet spraying method, for example, and does not restrict | limit a construction method.

本発明の吹付用建築モルタルは、結合相形成の主成分として(A)ポルトランドセメントを含有する。ポルトランドセメントは、例えば、普通、早強、超早強、中庸熱、低熱、耐硫酸塩等の各種ポルトランドセメントの1種又は2種以上が使用できる。通常の施工環境では、コスト的にも有利で汎用性の高い普通ポルトランドの使用が好ましい。また、ポルトランドセメントを含む混合セメントも使用可能であるが、そのモルタルへの配合量に関しては、混合セメント中のポルトランドセメント相当分だけをポルトランドセメント量とする。   The architectural mortar for spraying of this invention contains (A) Portland cement as a main component of binder phase formation. As the Portland cement, for example, one or more of various Portland cements such as normal, early strength, ultra-early strength, moderate heat, low heat, and sulfate resistance can be used. In a normal construction environment, it is preferable to use ordinary Portland, which is advantageous in terms of cost and highly versatile. Moreover, although the mixed cement containing Portland cement can also be used, only the part for Portland cement in a mixed cement is made into the amount of Portland cement about the compounding quantity to the mortar.

また、本発明の吹付用建築モルタルは、(B)高炉スラグ微粉及び/又はポゾラン反応性物質を含有する。好ましくは、高炉スラグ微粉単独使用か高炉スラグ微粉とポゾラン反応物質の併用とする。高炉スラグ微粉の含有は高密化や高強度化に寄与し、施工物の耐久性が向上する。また、ポゾラン反応性物質の含有は比較的早期に緻密化が進むため吹付施工物の変形防止にも寄与する。使用する高炉スラグ微粉は潜在水硬性を有する微粉であれば何れのものでも良い。好ましくはブレーン比表面積が4000〜6000cm2/gの微粉を使用する。また、ポゾラン反応性物質はシリカフューム、フライアッシュ、火山灰等を挙げることができ、何れのものでも使用できる。高炉スラグ微粉及び/又はポゾラン反応性物質の含有量は、ポルトランドセメント含有量100質量部に対し、26〜38質量部(何れか一方しか含まないときはその質量。両方を含むときはその合計質量とする。)である。好ましい含有量は30〜34質量部である。26質量部未満では含有効果が殆ど得られないので好ましくなく、また38質量部を超えると収縮変形が顕著になる虞があるので好ましくない。尚、高炉スラグ微粉とポゾラン反応性物質を併用するときの両者の含有割合は特に制限されない。好ましくは概ね等量か高炉スラグを2割程度まで多めの割合とする。 Moreover, the building mortar for spraying of this invention contains (B) blast furnace slag fine powder and / or a pozzolanic reactive substance. Preferably, blast furnace slag fine powder is used alone or a combination of blast furnace slag fine powder and a pozzolanic reactant. Inclusion of blast furnace slag fine powder contributes to higher density and higher strength and improves the durability of the construction. In addition, the inclusion of the pozzolanic reactive substance contributes to the prevention of deformation of the sprayed construction because the densification proceeds relatively early. The blast furnace slag fine powder used may be any fine powder having latent hydraulic properties. Preferably, a fine powder having a Blaine specific surface area of 4000 to 6000 cm 2 / g is used. Examples of the pozzolanic reactive material include silica fume, fly ash, and volcanic ash, and any of them can be used. The content of blast furnace slag fine powder and / or pozzolanic reactive material is 26 to 38 parts by mass (100% by mass of Portland cement content). ). A preferable content is 30 to 34 parts by mass. If it is less than 26 parts by mass, the inclusion effect is hardly obtained, which is not preferable, and if it exceeds 38 parts by mass, shrinkage deformation may become remarkable, which is not preferable. In addition, when using together blast furnace slag fine powder and a pozzolanic reactive substance, the content rate of both is not restrict | limited. Preferably, the ratio is roughly equal or the blast furnace slag is increased to about 20%.

また、本発明の吹付用建築モルタルは、(C)石膏類を含有する。石膏類は、無水石膏、半水石膏又は二水石膏が使用できる。工業薬品の無水硫酸カルシウムなども使用できる。石膏類を含むことで、乾燥・硬化時の収縮が抑制され、それに伴う変形やひび割れ発生を防ぐことができる。石膏類は長期強度の延びも期待できる。 石膏類の吹付用建築モルタル中の含有量は、ポルトランドセメント含有量100質量部に対し、6〜10質量部とする。好ましくは、7.5〜9.0質量部の含有量とする。6質量部未満では硬化時の収縮が十分抑制できないことがあり、また10質量部を超えると凝結遅延の虞があるので好ましくない。   Moreover, the architectural mortar for spraying of this invention contains (C) gypsum. As the gypsum, anhydrous gypsum, hemihydrate gypsum, or dihydrate gypsum can be used. An industrial chemical such as anhydrous calcium sulfate can also be used. By including gypsum, shrinkage during drying and curing can be suppressed, and deformation and cracking associated therewith can be prevented. Gypsum can be expected to increase long-term strength. Content in the building mortar for spraying plaster shall be 6-10 mass parts with respect to 100 mass parts of Portland cement content. Preferably, the content is 7.5 to 9.0 parts by mass. If it is less than 6 parts by mass, shrinkage during curing may not be sufficiently suppressed, and if it exceeds 10 parts by mass, there is a possibility of setting delay, which is not preferable.

また、本発明の吹付用建築モルタルは、(D)増粘剤を含有する。増粘剤としてはモルタルやコンクリートで使用できる水溶性の増粘剤なら何れのものでも使用できる。具体的には、セルロース誘導体、デンプン誘導体、ゼラチン、アラビアゴム等の水溶性高分子を挙げることができるが限定されない。好ましくは、20℃で2%水溶液の粘度が1500〜35000mPa・sのセルロース誘導体を使用する。前記セルロース誘導体としては、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等が、20℃で2%水溶液の粘度が前記範囲になるものを容易に調整できるので好ましい。増粘剤の含有により、吹付工法用建築モルタル構成成分の材料分離の抑制と吹付時の粘着性向上に寄与する。増粘剤の含有量は、ポルトランドセメント含有量100質量部に対し、0.2〜0.4質量部(液状増粘剤のときは固形分換算量)である。好ましい含有量は0.25〜0.35質量部(液状増粘剤のときは固形分換算量)である。0.2質量部未満では材料分離を十分抑えられないことや粘着性向上が殆ど無いので好ましくなく、また0.4質量部を超えると粘性が上昇し過ぎて良好な流動性が得られず、吹付装置を介しての圧送性に支障をきたす虞があるので好ましくない。   Moreover, the architectural mortar for spraying of this invention contains (D) thickener. As the thickener, any water-soluble thickener that can be used in mortar or concrete can be used. Specific examples include water-soluble polymers such as cellulose derivatives, starch derivatives, gelatin, and gum arabic, but are not limited thereto. Preferably, a cellulose derivative having a 2% aqueous solution viscosity of 1500 to 35000 mPa · s at 20 ° C. is used. As the cellulose derivative, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose and the like are preferable since those having a viscosity of 2% aqueous solution at 20 ° C. within the above range can be easily adjusted. By containing a thickener, it contributes to suppression of material separation of building mortar constituents for spray construction and improvement of adhesiveness during spraying. The content of the thickener is 0.2 to 0.4 parts by mass (in terms of solid content in the case of a liquid thickener) with respect to 100 parts by mass of the Portland cement content. The preferable content is 0.25 to 0.35 parts by mass (in the case of a liquid thickener, the solid content equivalent amount). Less than 0.2 parts by weight is not preferable because the material separation cannot be sufficiently suppressed and there is almost no improvement in adhesiveness, and when it exceeds 0.4 parts by weight, the viscosity increases so much that good fluidity cannot be obtained. This is not preferable because there is a possibility that the pumpability through the spraying device may be hindered.

また、本発明の吹付用建築モルタルは、(E)フミン酸及び/又はフルボ酸を含有する。フミン酸及び/又はフルボ酸の含有により、注水後の材料分離抵抗性の向上と、モルタルのしまりを早めることができ、吹付施工物の付着力が増進する。
フミン酸とフルボ酸は、いずれも植物などが微生物により分解される最終生成物である腐植物質である。フルボ酸は天然フルボ酸が使用できる。フミン酸は天然フミン酸と再生フミン酸の何れでも使用することができる。天然フミン酸及び天然フルボ酸は生成源に限定されずに使用できる。再生フミン酸は市販工業製品のニトロフミン酸が例示できるが、これの使用に限定されるものではない。また、フミン酸塩は製造時の配合に使用しない。フミン酸塩はフミン酸本来の活性作用が失われ、本発明でフミン酸配合によって奏される前記のような特性が得難くなるためである。 本発明の吹付用建築モルタル中のフミン酸及び/又はフルボ酸の含有量は、ポルトランドセメント含有量100質量部に対し、5〜10質量部とするのが好ましい。好ましいフミン酸及び/又はフルボ酸含有量は、ポルトランドセメント含有量100質量部に対し、7〜9質量部である。(何れか一方だけ含有のときはその質量。両方含有のときは合計質量とする。)5質量部未満の含有量では、含有効果が殆ど得られない。また、フミン酸及び/又はフルボ酸含有量が10質量部を越えると、粘性が上昇し過ぎることがあり、施工作業性が阻害されるので好ましくない。
Moreover, the building mortar for spraying of this invention contains (E) humic acid and / or fulvic acid. By containing humic acid and / or fulvic acid, it is possible to improve the material separation resistance after water injection and to shorten the mortar tightness, and to improve the adhesion of the sprayed construction.
Both humic acid and fulvic acid are humic substances that are end products of plants and the like that are decomposed by microorganisms. Natural fulvic acid can be used as the fulvic acid. As the humic acid, either natural humic acid or regenerated humic acid can be used. Natural humic acid and natural fulvic acid can be used without being limited to the production source. The regenerated humic acid can be exemplified by a commercially available industrial product nitrohumic acid, but is not limited to the use thereof. In addition, humic acid salts are not used for blending during production. This is because the humic acid salt loses the original activity of humic acid, making it difficult to obtain the above-described characteristics obtained by blending humic acid in the present invention. The content of humic acid and / or fulvic acid in the building mortar for spraying of the present invention is preferably 5 to 10 parts by mass with respect to 100 parts by mass of Portland cement content. A preferable humic acid and / or fulvic acid content is 7 to 9 parts by mass with respect to 100 parts by mass of the Portland cement content. (When only one of them is contained, its mass. When both are contained, the total mass is assumed.) When the content is less than 5 parts by mass, almost no inclusion effect is obtained. On the other hand, when the humic acid and / or fulvic acid content exceeds 10 parts by mass, the viscosity may increase excessively, which is not preferable because construction workability is hindered.

また、本発明の吹付用建築モルタルは、(F)細骨材を含有する。細骨材は、最大粒径5mm以下であってモルタルに使用できるものなら、材質を含め特に限定されない。具体的には、例えば、山砂、川砂、海砂等の天然砂、砕石粉等の普通骨材を挙げることができる。細骨材は全量普通細骨材からなるものでも良いが、好ましくは、無機質軽量骨材を最大5質量%含む細骨材を使用することで、吹付施工物の自重による変形・崩落を抑制し、弾性係数を小さくしてひび割れやリバウンドを低減させる作用が高まる。無機質軽量骨材としては、例えばパーライト、ガラスバルーン等の中空状の人工軽量骨材や軽石などの天然多孔質骨材を好適に挙げることができる。有機質軽量骨材は比重が軽過ぎて材料分離を起こし易く、モルタル圧送過程が不可欠である吹付施工には適さない。また、粒度分布の異なる複数の種類の細骨材を用いても良い。特に複数種の細骨材からなり、粒径600μm未満の微細骨材とそれより大きい細骨材(非微細骨材)を質量比(非微細骨材/微細骨材)概ね1〜4の割合で含むものにすると、より緻密な組織が得易く、かつ吹付後の施工物肌面も平滑に近い表面が得やすい。本発明の吹付用建築モルタル中の細骨材の含有量は、ボルトランドセメント含有量100質量部に対し、230〜290質量部とする。細骨材が230質量部未満の含有量では、収縮ひび割れが発生する虞があるので好ましくなく、290質量部を越えると含有量では強度の低下や、吹付施工物の液垂れが起こりやすくなるので好ましくない。   Moreover, the building mortar for spraying of this invention contains (F) fine aggregate. The fine aggregate is not particularly limited as long as it has a maximum particle size of 5 mm or less and can be used for mortar. Specific examples include natural sand such as mountain sand, river sand, sea sand, and ordinary aggregate such as crushed stone powder. The fine aggregate may consist of ordinary fine aggregates in total, but it is preferable to use fine aggregates containing up to 5% by weight of inorganic lightweight aggregate to suppress deformation and collapse due to the weight of the sprayed construction. The action of reducing cracks and rebound by reducing the elastic modulus is enhanced. As the inorganic lightweight aggregate, for example, hollow artificial lightweight aggregates such as pearlite and glass balloons and natural porous aggregates such as pumice can be preferably exemplified. Organic lightweight aggregates are too light to cause material separation and are not suitable for spray construction where mortar pumping is essential. A plurality of types of fine aggregates having different particle size distributions may be used. In particular, it is composed of multiple types of fine aggregates, and the mass ratio (non-fine aggregate / fine aggregate) is roughly 1 to 4 for fine aggregates with a particle size of less than 600 μm and larger fine aggregates (non-fine aggregates). If it is included, it is easy to obtain a denser structure, and the surface of the construction surface after spraying can be easily obtained. Content of the fine aggregate in the building mortar for spraying of this invention shall be 230-290 mass parts with respect to 100 mass parts of bolt land cement content. If the content of the fine aggregate is less than 230 parts by mass, shrinkage cracks may occur. This is not preferable, and if the content exceeds 290 parts by mass, the strength tends to decrease and dripping of the sprayed construction tends to occur. It is not preferable.

また、本発明の吹付用建築モルタルは、さらに(G)ポリマーセメントモルタル用ポリマーを含有することが好ましい。ポリマーセメントモルタル用ポリマーの含有は、モルタル吹付時の付着力強化と付着性維持に寄与する。ポリマーセメントモルタル用ポリマーとしては、JISA6203:2015で規定されるポリマーセメントモルタルに用いるセメント混和用ポリマーディスパージョン及びセメント混和用再乳化形粉末樹脂であれば、何れのものでも使用できる。具体的には、一例としてポリマーディスパージョンではスチレンブタジエンゴム系、再乳化形粉末樹脂ではアクリル系または酢酸ビニル系のポリマーを挙げることができるが、掲示例に限定されない。好ましくは、特に接着硬化速度が早いポリマー、例えばエポキシ系ポリマーなどの使用は施工作業面で制約を受け易いので避ける。ポリマーセメントモルタル用ポリマーを使用する場合の好ましい含有量は、ポルトランドセメント含有量100質量部に対し、固形分質量換算で2.5〜7.0質量部とする。   Moreover, it is preferable that the building mortar for spraying of this invention contains the polymer for (G) polymer cement mortar further. Inclusion of the polymer for polymer cement mortar contributes to strengthening adhesion and maintaining adhesion during mortar spraying. As the polymer for the polymer cement mortar, any polymer dispersion for cement admixture and re-emulsified powder resin for cement admixture used for the polymer cement mortar specified in JIS A6203: 2015 can be used. Specifically, examples of the polymer dispersion include a styrene butadiene rubber-based polymer, and examples of the re-emulsified powder resin include an acrylic-based or vinyl acetate-based polymer, but are not limited to the examples shown. Preferably, the use of a polymer having a high adhesion curing rate, such as an epoxy polymer, is avoided because it is subject to restrictions in terms of construction work. When using the polymer for polymer cement mortar, the preferable content is 2.5 to 7.0 parts by mass in terms of solid content with respect to 100 parts by mass of the Portland cement content.

また、本発明の吹付用建築モルタルは、さらに(H)繊維を含有することが好ましい。繊維の含有はモルタル吹付時の液垂れや崩落抑制と吹付施工物のひび割れ防止に寄与する。本発明の吹付用建築モルタルに含有させる繊維は、最大長さ10mm、好ましくは長さ5〜6mm程度の繊維であって、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使用できる。具体的には、高分子、鋼、炭素、硼素、ガラス、ガラス以外のセラミックス等の材質の繊維を例示できる。耐久性やコスト面からは、例えばビニロンやポリアミド系合成樹脂(ナイロン)などを材質とする高分子繊維が望ましい。繊維を使用する場合の好ましい含有量は、ポルトランドセメント含有量100質量部に対し、0.2〜0.5質量部とする。 Moreover, it is preferable that the building mortar for spraying of this invention contains (H) fiber further. The fiber content contributes to the prevention of liquid dripping and collapse during mortar spraying and the prevention of cracks in the sprayed construction. The fiber contained in the building mortar for spraying of the present invention is a fiber having a maximum length of 10 mm, preferably about 5 to 6 mm, and any fiber that can be used for mortar or concrete can be used. Specifically, fibers made of materials such as polymers, steel, carbon, boron, glass, ceramics other than glass can be exemplified. From the viewpoint of durability and cost, polymer fibers made of, for example, vinylon or polyamide synthetic resin (nylon) are desirable. When using a fiber, preferable content shall be 0.2-0.5 mass part with respect to 100 mass parts of Portland cement content.

また、本発明の吹付用建築モルタルは、本発明の効果を実質喪失させない範囲で、前記以外の成分を含有しても良い。このような成分として、減水剤類、粘土鉱物、膨張材、収縮低減剤、凝結調整剤または顔料等を例示することができる。   Moreover, the architectural mortar for spraying of this invention may contain components other than the above in the range which does not lose the effect of this invention substantially. Examples of such components include water reducing agents, clay minerals, expanding materials, shrinkage reducing agents, setting modifiers, pigments, and the like.

また、本発明の吹付用建築モルタルの混練に添加される水の量は、特に制限されるものではない。施工対象、施工環境及びモルタル配合等に応じて適宜定めれば良い。配合量の目安を例示すると、20℃前後で混練・打設する場合、吹付用建築モルタルの細骨材を含む粉体成分総含有量100質量部に対し、20〜25質量部の水が推奨使用量であるが、限定されるものではない。   Moreover, the amount of water added to the kneading of the building mortar for spraying of the present invention is not particularly limited. What is necessary is just to determine suitably according to a construction object, construction environment, mortar mixture, etc. For example, when mixing and setting at around 20 ° C., 20 to 25 parts by weight of water is recommended for 100 parts by weight of the total amount of powder components including fine aggregates of building mortar for spraying. The amount used is not limited.

また、本発明の吹付用建築モルタルの吹付方法は、特に限定されない。好ましい吹付方法は、水以外の前記モルタル含有成分を別途用意した混合機で乾式混合し、この混合物を吹付装置に、例えばポンプによって圧送する。圧送経路中、例えば吹付装置内で、圧送中の前記混合物に注水を行う。この場合の吹付装置は、装置内に混合物の圧送管と、先端に吐出孔を設けた吹付ノズルを構成に含む該圧送管に、好適にはシャワーリング或いはY字状又はT字状の三方管(以下、総称してY管と称す。)が注液部材として組込まれた吹付装置を使用する。注水はシャワーリングの場合は環内周に設けられた注液孔から、Y管の場合はモルタルの圧送経路の圧送方向(主管)に対して概ね30〜90°の角度の方向に配管した側管から水を加える。注水と同時期から未含水のモルタル混合物と水との混合・混練が、ノズル先端までの経路中で行われる。圧送された注水混合物は前記ノズル先端に設けられた孔から吐出され、対象物に吹付けられる。この方法とは別の、他の好ましい吹付方法を例示すると、別途用意した混練装置に、水を含むモルタル全配合成分の全量を投入し、湿式混合して得たモルタルスラリーを吹付装置にポンプ圧送する。この場合の吹付装置は、前記混練装置又はスラリー貯蔵タンクとホース等を介して接続された、実質圧送管ノズルだけで構成されたものでも良く、ノズルの先端孔からモルタルスラリーが吐出され、対象物に吹き付けられる。   Moreover, the spraying method of the building mortar for spraying of this invention is not specifically limited. In a preferred spraying method, the mortar-containing components other than water are dry-mixed with a separately prepared mixer, and the mixture is pumped to the spraying device by, for example, a pump. In the pumping route, for example, in the spraying apparatus, water is injected into the mixture being pumped. The spraying device in this case is preferably a shower ring or a Y-shaped or T-shaped three-way tube for the pressure-feeding tube including a pressure-feeding tube of the mixture in the device and a spraying nozzle provided with a discharge hole at the tip. (Hereinafter, collectively referred to as a Y tube) is used as a liquid injection member. In the case of a shower ring, water is poured from a liquid injection hole provided on the inner periphery of the ring, and in the case of a Y pipe, the side is piped in an angle of approximately 30 to 90 ° with respect to the pumping direction (main pipe) of the mortar pumping path. Add water from the tube. From the same time as the water injection, mixing and kneading of the hydrated mortar mixture and water are performed in the path to the nozzle tip. The pumped water injection mixture is discharged from a hole provided at the tip of the nozzle and sprayed onto the object. To illustrate another preferred spraying method different from this method, a mortar slurry obtained by wet-mixing a mortar slurry obtained by wet-mixing all the ingredients of mortar including water in a separately prepared kneading apparatus is pumped to the spraying apparatus. To do. The spraying device in this case may be composed only of a substantially pressure feed nozzle connected to the kneading device or slurry storage tank via a hose, etc., and mortar slurry is discharged from the tip hole of the nozzle, Is sprayed on.

以下、実施例により本発明を具体的に詳しく説明するが、本発明は実施例に限定されるものではない。また、特記無い限り、以下の実施例は評価も含め、20(±0.5)℃の環境下で行った。   EXAMPLES Hereinafter, although an Example demonstrates this invention concretely in detail, this invention is not limited to an Example. Further, unless otherwise specified, the following examples were conducted under an environment of 20 (± 0.5) ° C. including evaluation.

次に表す各材料を表1の配合となるよう、混練容器に投入し、次いで混合しながら水をセメント100質量部に対し80質量部加え、注水完了後約120秒間混練を行って高流動のスラリー状モルタル組成物を作製した。前記スラリー状モルタル組成物は作成後直ちにスラリー供給タンクに移した。スラリー供給タンクは、スラリーを圧送用ホースを介して吹付装置にポンプ圧送することができる。吹付装置は圧送量調整の為のバルブが付いた鋼製の圧送管とその先のノズル管部からなり、ノズルの先端には吐出用の孔があり、この孔からモルタルが吹き出される。   Each material shown below is put into a kneading container so as to have the composition shown in Table 1, and then 80 parts by mass of water is added to 100 parts by mass of cement while mixing. A slurry mortar composition was prepared. The slurry mortar composition was transferred to a slurry supply tank immediately after preparation. The slurry supply tank can pump the slurry to the spraying device via a pressure hose. The spraying device is composed of a steel pumping tube with a valve for adjusting the pumping amount and a nozzle tube part at the tip, and there is a discharge hole at the tip of the nozzle, and mortar is blown out from this hole.

A;普通ポルトランドセメント(太平洋セメント株式会社製)
B1;高炉スラグ微粉(ブレーン比表面積約4000cm2/g、市販品)
B2;フライアッシュ(JIS A6201;2008で規定のII種相当品、ブレーン比表面積2500cm2/g以上)
B3;シリカフューム(ブレーン比表面積約10万cm2/g、市販品)
C;II型無水石膏(市販試薬)
D1;プロピルメチルセルロース系増粘剤(20℃での粘度約4000mPa・s、信越化学工業社製「90SH−4000」)
D2;メチルセルロース系増粘剤(20℃での粘度約8000mPa・s、信越化学工業社製「SM−8000」)
E1;フミン酸(市販試薬)
E2;フミン酸(東京化成工業社製ニトロフミン酸)
E3;フルボ酸(市販試薬)
F1;細骨材・6号珪砂(三河産)
F2;細骨材・7号珪砂(三河産)
F3;パーライト(5mm目篩全通で1.2mm目篩通過分60%未満、太平洋パーライト社製)
G1;アクリル系再乳化型粉末樹脂(太平洋マテリアル社製)
G2;スチレンブタジエンゴム系ポリマーディスパーション(太平洋マテリアル社製)
H;ビニロン繊維(長さ6mm、市販品)
A: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
B1; ground granulated blast furnace slag (Brain specific surface area of about 4000 cm 2 / g, commercially available)
B2: Fly ash (JIS A6201; Class II equivalent specified in 2008, Blaine specific surface area of 2500 cm 2 / g or more)
B3: Silica fume (Brain specific surface area of about 100,000 cm 2 / g, commercially available product)
C; type II anhydrous gypsum (commercially available reagent)
D1: propylmethylcellulose thickener (viscosity at 20 ° C. of about 4000 mPa · s, “90SH-4000” manufactured by Shin-Etsu Chemical Co., Ltd.)
D2; methylcellulose-based thickener (viscosity at 8000 ° C. of about 8000 mPa · s, “SM-8000” manufactured by Shin-Etsu Chemical Co., Ltd.)
E1; Humic acid (commercially available reagent)
E2: Humic acid (Nitrohumic acid manufactured by Tokyo Chemical Industry Co., Ltd.)
E3: Fulvic acid (commercially available reagent)
F1: Fine aggregate, No. 6 silica sand (Mikawa)
F2: Fine aggregate, No. 7 quartz sand (from Mikawa)
F3; Perlite (5 mm sieve full passage, 1.2 mm sieve passage less than 60%, manufactured by Pacific Perlite)
G1: Acrylic re-emulsifying powder resin (manufactured by Taiheiyo Materials Co., Ltd.)
G2: Styrene butadiene rubber-based polymer dispersion (manufactured by Taiheiyo Materials Co., Ltd.)
H: Vinylon fiber (length 6 mm, commercially available)

Figure 2019178036
Figure 2019178036

[スラリー状モルタルの経時可使性(流動状況)評価]
混練り後のスラリー状モルタルの経時可使性の評価として、JIS R 5201に規定する方法でフロー試験を行った。初期フロー測定後、モルタルを一般養生室に30分静置後、再度同じフロー試験を行って経時後のフローを測定し、初期フローからの変化率を算出した。変化率が20%以下であれば所定の経時時間内(練り上がり後30分間)は施工作業可能な流動性が確保されていると判断し、可使性「良好」と判断し、20%を超えた場合若しくはフロー測定不能な性状(例えば、流動性喪失)だったものは、「不良」と判断した。この結果を表2に示す。
[Evaluation of usability (flow status) of slurry mortar over time]
As an evaluation of the availability over time of the slurry mortar after kneading, a flow test was performed by the method prescribed in JIS R 5201. After the initial flow measurement, the mortar was left in the general curing room for 30 minutes, and then the same flow test was performed again to measure the flow after the lapse of time, and the rate of change from the initial flow was calculated. If the rate of change is 20% or less, it is judged that the fluidity that enables construction work is secured within the predetermined time (30 minutes after kneading), and the usability is judged as “good”, and 20% When it exceeded or it was the property (for example, loss of fluidity) where the flow measurement was impossible, it was judged as “bad”. The results are shown in Table 2.

[スラリー状モルタルの材料分離に関する評価]
また、前記混練直後のスラリー状モルタルを、地面に水平に設置した内寸縦13cm、横8.5cm、高さ1.8cmで上面開放のブラスチック製の角形容器に、高さ5mmとなるよう流し込んだ。このモルタル状組成物の材料分離の評価として、ブラスチック製容器中に流し込んでから30分間放置した打設物表面に、ブリーディング水が発生しているか否かを目視で調べた。ブリーディング水の発生が見られなかったものを材料分離が「無」と判断し、それ以外の状況となったものを材料分離が「有」と判断した。結果を表2に示す。
[Evaluation of material separation of slurry mortar]
Also, the slurry-like mortar immediately after the kneading is placed in a plastic square container with an inner dimension of 13 cm, a width of 8.5 cm, a height of 1.8 cm and an open top surface that is placed horizontally on the ground so that the height is 5 mm. Poured. As an evaluation of the material separation of the mortar composition, it was visually examined whether bleeding water was generated on the surface of the cast article which had been allowed to stand for 30 minutes after being poured into a plastic container. In the case where no bleeding water was observed, the material separation was judged as “No”, and in other cases, the material separation was judged as “Yes”. The results are shown in Table 2.

[スラリー状モルタルの容重測定]
前記混練直後のモルタル組成物の単位容積質量を、JIS A1171に規定する方法で測定した。その結果を表2に示す。
[Measurement of volume of slurry mortar]
The unit volume mass of the mortar composition immediately after kneading was measured by the method specified in JIS A1171. The results are shown in Table 2.

[付着性の評価]
混練直後のスラリー状モルタルを前記吹付装置を用い、ノズル先端から約1m離れた、地面に垂直に設置されたコンクリート平板の0.9m×0.9mの面に向かって、10リットル/分の流量で5mm程度の施工厚に均一になるよう吹付けた。次いで、1日養生した吹付施工物の上面に、同じ配合の混練直後のスラリー状モルタルを、さらに5mm分の施工厚さが追加されるよう、同じ吹付条件でむらなく吹付けた。吹付終了から10分経過後の吹付面を目視観察し、吹付物のリバウンド(跳ね返り)、液垂れ、崩落等が実質的に無かったものを付着性が「良好」と判断し、それ以外の状況となったものは全て付着性が「不良」と判断した。この結果を表2に示す。
[Evaluation of adhesion]
A flow rate of 10 liters / minute toward the 0.9 m x 0.9 m surface of a concrete flat plate installed perpendicularly to the ground, about 1 m away from the nozzle tip, using the spraying device for the slurry mortar immediately after kneading And sprayed uniformly to a construction thickness of about 5 mm. Next, the slurry mortar immediately after kneading with the same composition was sprayed evenly on the upper surface of the sprayed construction cured for 1 day under the same spraying conditions so that a construction thickness of 5 mm was further added. Visual observation of the sprayed surface after 10 minutes from the end of spraying, judging that there was substantially no rebound (bounce back), dripping, collapse, etc. of the sprayed material, and that the adhesiveness was “good”, and other situations As a result, it was judged that the adhesion was “bad”. The results are shown in Table 2.

[長さ変化の評価]
また、前記の如く作製した注水後のスラリー状モルタル組成物を用い、長さ変化の測定に供した。長さ変化の測定方法は、「日本建築仕上材工業会規格の吹付モルタル材(NSKS−007)」に規定する「長さ変化試験」に準じて作製・脱型した試験体を用いた。JIS A 1129の2.2(コンタクトゲージ法)に規定する方法により、基長設定後養生し、28日後の長さ変化の変化率(%)を算出した。前記変化率の結果は表2に示す。なお、長さ変化の変化率が、0.050(%)以下のモルタル施工物の場合は、建築用のモルタルとして問題なく適用できる。
[Evaluation of length change]
Moreover, it used for the measurement of a length change using the slurry-like mortar composition after water injection produced as mentioned above. The measuring method of length change used the test body produced and demolded according to the "length change test" prescribed | regulated to "the spraying mortar material (NSKS-007) of the Japan Building Finishing Material Industry Association standard". According to the method defined in 2.2 (contact gauge method) of JIS A 1129, curing was performed after setting the base length, and the change rate (%) of the length change after 28 days was calculated. The results of the rate of change are shown in Table 2. In addition, in the case of the mortar construction material whose change rate of length change is 0.050 (%) or less, it can apply without a problem as a mortar for construction.

Figure 2019178036
Figure 2019178036

[圧縮強度の評価]
また、前記の如く作製した注水後のスラリー状モルタルを、作製後直ちに、内寸40×40×160mmの成形用型枠に流し込んだ。これを空気中に24時間静置して脱型した。脱型物は、所定の材齢まで20℃(±0.5℃)恒温庫に入れて、それぞれ材齢材齢7日と28日の供試体を得た。各供試体の一軸圧縮強度をアムスラー式圧縮強度試験機で測定した。この結果を表3に記す。尚、所定材齢で未硬化だったものは供試体作成不能のため強度測定を行えず、「×」と表記した。
[Evaluation of compressive strength]
Moreover, the slurry-like mortar after the water injection prepared as described above was poured into a forming mold having an inner size of 40 × 40 × 160 mm immediately after the preparation. This was left in the air for 24 hours to remove the mold. The demolded material was placed in a constant temperature chamber at 20 ° C. (± 0.5 ° C.) until a predetermined age, and specimens having an age of 7 days and 28 days were obtained. The uniaxial compressive strength of each specimen was measured with an Amsler type compressive strength tester. The results are shown in Table 3. In addition, the thing which was not hardened | cured at the predetermined material age could not measure a strength | strength because it cannot produce a test piece, and was described as "x".

[曲げ強度の評価]
また、前記の如く作製した注水後のスラリー状モルタルを、作製後直ちに、内寸40×40×160mmの成形用型枠に充填した。これを空気中に24時間静置して脱型した。脱型物は、所定の材齢まで20℃(±0.5℃)恒温庫に入れて、それぞれ材齢材齢7日と28日の供試体を得た。各供試体の三点曲げ強度をミハエリス曲げ試験機で測定した。この結果を表3に記す。尚、所定材齢で未硬化だったものは供試体作成不能のため強度測定を行えず、「×」と表記した。
[Evaluation of bending strength]
Moreover, the slurry-like mortar after water injection prepared as described above was filled in a molding mold having an inner size of 40 × 40 × 160 mm immediately after the preparation. This was left in the air for 24 hours to remove the mold. The demolded material was placed in a constant temperature chamber at 20 ° C. (± 0.5 ° C.) until a predetermined age, and specimens having an age of 7 days and 28 days were obtained. The three-point bending strength of each specimen was measured with a Michaelis bending tester. The results are shown in Table 3. In addition, the thing which was not hardened | cured at the predetermined material age could not measure a strength | strength because it cannot produce a test piece, and was described as "x".

[付着強度の評価]
また、前記の如く作製した注水後のスラリー状モルタル組成物を用い、付着強度の測定に供した。付着強度の測定方法は、「日本建築仕上材工業会規格の吹付モルタル材(NSKS−007)」に規定する「付着強さ試験」に準じて行った。測定結果を表3に示す。
[Evaluation of adhesion strength]
Moreover, it used for the measurement of adhesive strength using the slurry-like mortar composition after water injection produced as mentioned above. The measuring method of adhesion strength was performed according to the “adhesion strength test” prescribed in “Sprayed mortar material (NSKS-007) of the Japan Architectural Finishing Materials Association”. Table 3 shows the measurement results.

Figure 2019178036
Figure 2019178036

表2から、本発明による吹付用建築モルタルは、液垂れや崩落を起こさない優れた付着性を具備しつつも、吹付圧送に適した流動性状が、混練後も施工作業に必要な時間程度は確保できることがわかる。また、表3からは本発明による吹付用建築モルタルは、吹付施工後の強度も高く、長期にわたり堅牢な施工物が維持できていることがわかる。   From Table 2, the building mortar for spraying according to the present invention has excellent adhesiveness that does not cause dripping or collapsing, but the fluidity suitable for spraying is about the time required for construction work even after kneading. It can be seen that it can be secured. Moreover, it can be seen from Table 3 that the building mortar for spraying according to the present invention has high strength after spraying construction and can maintain a solid construction for a long time.

Claims (4)

(A)ポルトランドセメント100質量部、(B)高炉スラグ微粉及び/又はポゾラン反応性物質26〜38質量部、(C)石膏類4〜12質量部、(D)増粘剤0.2〜0.4質量部、(E)フミン酸及び/又はフルボ酸5〜10質量部および(F)細骨材230〜290質量部を含有する吹付用建築モルタル。   (A) 100 parts by weight of Portland cement, (B) 26 to 38 parts by weight of blast furnace slag fine powder and / or pozzolanic reactive material, (C) 4 to 12 parts by weight of gypsum, (D) thickener 0.2 to 0 Building mortar for spraying containing .4 parts by mass, (E) 5-10 parts by mass of humic acid and / or fulvic acid and (F) 230-290 parts by mass of fine aggregate. さらに、(G)ポリマーセメントモルタル用ポリマーを含有する請求項1記載の吹付用建築モルタル。   Furthermore, the building mortar for spraying of Claim 1 containing the polymer for polymer cement mortar (G). さらに、(H)繊維を含有する請求項1又は2記載の吹付用建築モルタル。   Furthermore, the building mortar for spraying of Claim 1 or 2 containing (H) fiber. 細骨材が、無機質軽量細骨材含有率5質量%以下(0質量%を含む。)の細骨材である請求項1〜3の何れかに記載の吹付用建築モルタル。   The spray building mortar according to any one of claims 1 to 3, wherein the fine aggregate is a fine aggregate having an inorganic lightweight fine aggregate content of 5 mass% or less (including 0 mass%).
JP2018068648A 2018-03-30 2018-03-30 Construction cement mortar for spraying Pending JP2019178036A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019218224A (en) * 2018-06-19 2019-12-26 太平洋マテリアル株式会社 Polymer cement mortar composition and polymer cement mortar
JP2021070594A (en) * 2019-10-29 2021-05-06 太平洋マテリアル株式会社 Polymer cement composition and polymer cement mortar

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019218224A (en) * 2018-06-19 2019-12-26 太平洋マテリアル株式会社 Polymer cement mortar composition and polymer cement mortar
JP7045269B2 (en) 2018-06-19 2022-03-31 太平洋マテリアル株式会社 Polymer cement mortar composition and polymer cement mortar
JP2021070594A (en) * 2019-10-29 2021-05-06 太平洋マテリアル株式会社 Polymer cement composition and polymer cement mortar
JP7321057B2 (en) 2019-10-29 2023-08-04 太平洋マテリアル株式会社 Polymer cement composition and polymer cement mortar

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