JP5221014B2 - Low shrink mortar composition - Google Patents

Low shrink mortar composition Download PDF

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JP5221014B2
JP5221014B2 JP2006207483A JP2006207483A JP5221014B2 JP 5221014 B2 JP5221014 B2 JP 5221014B2 JP 2006207483 A JP2006207483 A JP 2006207483A JP 2006207483 A JP2006207483 A JP 2006207483A JP 5221014 B2 JP5221014 B2 JP 5221014B2
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mass
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alumina cement
mortar composition
shrinkage
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JP2008031008A (en
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一行 水島
勉 木田
昭俊 荒木
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Denka Co Ltd
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Denki Kagaku Kogyo KK
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/06Aluminous cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/22Carbonation resistance
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • 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
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

本発明は、主に土木、建築分野において使用されるモルタル組成物に関する。   The present invention relates to a mortar composition mainly used in the civil engineering and construction fields.

土木、建築工事で使用されるモルタルに発生するひび割れには、硬化しつつある段階で表面の温度低下や風等が原因で発生するひび割れ、セメントの水和による自己収縮で発生するひび割れ、断面の大きな箇所で補修した場合に著しい水和熱が発生して生じるひび割れ、硬化後徐々に乾燥し水分が逸散することで発生する乾燥収縮によるひび割れ等がある。
モルタルの乾燥収縮によるひび割れ防止対策として、従来から乾燥収縮低減剤が使用されている。例えば、炭素数1〜4の低級アルコールのアルキレンオキサイド付加物(特許文献1)、エチレンオキサイド、プロピレンオキサイドのブロックまたはランダム化合物(特許文献2)、フェノールまたはアルキルフェノールのアルキルオキサイド付加物(特許文献3)、ビスフェノールのアルキルオキサイド付加物(特許文献4)、鎖状炭化水素にエチレンオキサイドとプロピレンオキサイド付加物(特許文献5)等が知られている。
特公昭56−51148号公報 特公平1−53214号公報 特公昭62−10947号公報 特公平5−40714号公報 特開2001−163653号公報
Cracks that occur in mortar used in civil engineering and construction work include cracks that occur due to surface temperature drop and wind at the stage of hardening, cracks that occur due to self-shrinkage due to cement hydration, There are cracks caused by significant heat of hydration when repaired at large locations, cracks due to drying shrinkage that occurs when the moisture gradually dissipates after curing, and moisture escapes.
Conventionally, a drying shrinkage reducing agent has been used as a measure for preventing cracking due to drying shrinkage of mortar. For example, alkylene oxide adduct of lower alcohol having 1 to 4 carbon atoms (Patent Document 1), block or random compound of ethylene oxide and propylene oxide (Patent Document 2), alkyl oxide adduct of phenol or alkylphenol (Patent Document 3) Further, alkyl oxide adducts of bisphenol (Patent Document 4), ethylene oxide and propylene oxide adducts (Patent Document 5) and the like are known as chain hydrocarbons.
Japanese Patent Publication No. 56-51148 Japanese Patent Publication No. 1-53214 Japanese Examined Patent Publication No. 62-10947 Japanese Patent Publication No. 5-40714 JP 2001-163653 A

しかしながら、従来の乾燥収縮低減剤は充分な性能ではなく、低温性状における強度発現が遅れるという問題もあった。また、エチレンオキサイドとプロピレンオキサイドとの共重合により構成されたポリオキシアルキレン基を有する化合物とオキシエチレンを有する化合物とを組み合わせた乾燥収縮低減剤は、硬化体の強度低下を起こさず、効率的に乾燥収縮を抑制することが知られているが(特許文献6)、中性化抑制や低温性状における強度発現に関する記載はない。
特開2003−171155号公報
However, conventional drying shrinkage reducing agents are not sufficient in performance, and there is also a problem that strength development in low temperature properties is delayed. In addition, the drying shrinkage reducing agent combining a compound having a polyoxyalkylene group formed by copolymerization of ethylene oxide and propylene oxide and a compound having oxyethylene does not cause a decrease in the strength of the cured product, and is effective. Although it is known to suppress drying shrinkage (Patent Document 6), there is no description regarding neutralization suppression or strength development in low temperature properties.
JP 2003-171155 A

また、乾燥収縮低減剤を補修用途の材料に配合し乾燥収縮を抑制する技術として、例えば、ある特定のポリオキシアルキレン誘導体をポリマーセメントモルタルに配合した吹付け材料(特許文献7)や、ある特定のポリオキシアルキレン誘導体を配合したモルタルにアルミン酸塩や炭酸塩、硫酸アルミニウムを急結剤として混合する吹付け材料等が知られている(特許文献8、9)。これらは、低温性状についての記載がない。
特開2004−203699号公報 特開2005−082432号公報 特開2005−104826号公報
Moreover, as a technique for blending a drying shrinkage reducing agent into a material for repairing and suppressing drying shrinkage, for example, a spraying material (Patent Document 7) in which a specific polyoxyalkylene derivative is blended in a polymer cement mortar, or a certain specific There is known a spraying material or the like in which aluminate, carbonate, or aluminum sulfate is mixed as a rapid setting agent with mortar containing the polyoxyalkylene derivative (Patent Documents 8 and 9). There is no description about the low-temperature properties.
JP 2004-203699 A Japanese Patent Laying-Open No. 2005-082432 JP 2005-104826 A

さらに、ある特定のポリオキシアルキレン誘導体を使用した場合の低温性状を改善する目的でケイ酸塩や有機カルボン酸金属塩等の凝結促進剤を配合する技術も知られている(特許文献10、11)。
特開2005−089227号公報 特開2005−089228号公報
Furthermore, a technique is known in which a setting accelerator such as a silicate or an organic carboxylic acid metal salt is blended for the purpose of improving the low-temperature properties when a specific polyoxyalkylene derivative is used (Patent Documents 10 and 11). ).
Japanese Patent Laying-Open No. 2005-089227 Japanese Patent Laying-Open No. 2005-089228

本発明は、特定の乾燥収縮低減剤などを使用することによって、乾燥収縮を著しく低減するだけでなく、中性化抑制効果を有し、低温性状が良好な低収縮モルタル組成物を提供する。   The present invention provides a low-shrinkage mortar composition that not only significantly reduces drying shrinkage but also has a neutralization-inhibiting effect and good low-temperature properties by using a specific drying-shrinkage reducing agent or the like.

すなわち、本発明は、以下の構成を取る。
(1)アルミナセメント、骨材、膨張材、および一般式(1)で表されるA成分が10〜90質量%、一般式(2)で表されるB成分が10〜90質量%の割合からなる乾燥収縮低減剤を含有してなり、膨張材がアルミナセメント100質量部に対して1〜10質量部であり、乾燥収縮低減剤がアルミナセメント100質量部に対して0.1〜10質量部であることを特徴とする低収縮モルタル組成物。
一般式(1) HO{(AO)a(C24O)b}−H
ただし、AOは炭素数3および/または4のオキシアルキレン基を表し、a、bはそれぞれ、1≦a、1≦bであり、また、2≦(a+b)≦30、0.4≦a/bである。ランダム付加物でもブロック付加物でも良い。
一般式(2) R´O(A´O)n´−H
ただし、R´は炭素数で2〜8のアルキル基を表し、A´Oは炭素数2および/または3のオキシアルキレン基を表し、n´は1〜10を表す。
(2)乾燥収縮低減剤が液体である(1)の低収縮モルタル組成物。
(3)スラグ、シリカフューム、およびフライアッシュの中から選ばれる一種以上の無機粉末を含有してなり、無機粉末がアルミナセメント100質量部に対して1〜20質量部である、(1)または(2)の低収縮モルタル組成物
(4)ポリマーディスパージョンを含有してなり、ポリマーディスパージョンがアルミナセメント100質量部に対して固形分換算で20質量部以下である、(1)〜(3)のいずれかの低収縮モルタル組成物。
(5)繊維を含有してなり、繊維がアルミナセメントと骨材あるいはアルミナセメントと無機粉末と骨材の合計100質量部に対して0.02〜2質量部である、(1)〜(4)のいずれかの低収縮モルタル組成物。
(6)凝結促進剤を含有してなり、凝結促進剤がアルミナセメント100質量部に対して1質量部以下である、(1)〜(5)のいずれかの低収縮モルタル組成物。
(7)消泡剤を含有する(1)〜(6)のいずれかの低収縮モルタル組成物。
That is, this invention takes the following structures.
(1) Alumina cement, aggregate, expanded material, and a ratio of 10 to 90% by mass of component A represented by general formula (1) and 10 to 90% by mass of component B represented by general formula (2) The expansion shrinkage agent is 1 to 10 parts by mass with respect to 100 parts by mass of the alumina cement, and the dry shrinkage reduction agent is 0.1 to 10 parts by mass with respect to 100 parts by mass of the alumina cement. A low shrinkage mortar composition characterized by being a part .
General formula (1) HO {(AO) a (C 2 H 4 O) b } -H
However, AO represents an oxyalkylene group having 3 and / or 4 carbon atoms, a and b are 1 ≦ a and 1 ≦ b, respectively, and 2 ≦ (a + b) ≦ 30 and 0.4 ≦ a / b. A random adduct or a block adduct may be used.
General formula (2) R'O (A'O) n ' -H
However, R ′ represents an alkyl group having 2 to 8 carbon atoms, A′O represents an oxyalkylene group having 2 and / or 3 carbon atoms, and n ′ represents 1 to 10.
(2) The low shrinkage mortar composition according to (1), wherein the drying shrinkage reducing agent is a liquid.
(3) One or more inorganic powders selected from slag, silica fume, and fly ash are contained , and the inorganic powder is 1 to 20 parts by mass with respect to 100 parts by mass of the alumina cement. (1) or ( 2) The low shrinkage mortar composition .
(4) The low-shrink mortar composition according to any one of (1) to (3) , comprising a polymer dispersion, wherein the polymer dispersion is 20 parts by mass or less in terms of solid content with respect to 100 parts by mass of the alumina cement. object.
(5) It contains fibers, and the fibers are 0.02 to 2 parts by mass with respect to 100 parts by mass in total of alumina cement and aggregate or alumina cement, inorganic powder and aggregate. (1) to (4 ) Any of the low shrink mortar compositions.
(6) The low shrinkage mortar composition according to any one of (1) to (5) , comprising a setting accelerator, wherein the setting accelerator is 1 part by mass or less with respect to 100 parts by mass of the alumina cement .
(7) The low shrinkage mortar composition according to any one of (1) to (6), which contains an antifoaming agent.

本発明は、従来の乾燥収縮低減剤とは異なる組成の乾燥収縮低減剤などにより、乾燥収縮を著しく低減するだけでなく、中性化抑制効果を有し、低温性状が良好な低収縮モルタル組成物が得られる。   The present invention is a low-shrinkage mortar composition that not only significantly reduces drying shrinkage but also has a neutralization-inhibiting effect and good low-temperature properties due to a dry-shrinkage-reducing agent having a composition different from that of conventional dry-shrinkage-reducing agents. A thing is obtained.

以下、本発明を詳細に説明する。   Hereinafter, the present invention will be described in detail.

本発明で使用するアルミナセメントとは、モノカルシウムアルミネートを主要鉱物として含有するクリンカー粉砕物から得られるものであり、例えば、アルミナセメント1号やアルミナセメント2号などが使用できる。アルミナセメントの粉末度は、水和活性の点で2000〜8000cm/gが好ましい。また、アルミナセメントの粒度調整を行い、粒子径5μm以下の粒子を全体の30質量%未満としたものが硬化するときの収縮が小さくなるので好ましい。 The alumina cement used in the present invention is obtained from a clinker pulverized product containing monocalcium aluminate as a main mineral. For example, alumina cement 1 or alumina cement 2 can be used. The fineness of the alumina cement is preferably 2000 to 8000 cm 2 / g in terms of hydration activity. Moreover, the particle size of the alumina cement is adjusted, and particles having a particle diameter of 5 μm or less and less than 30% by mass are preferable because shrinkage when cured is reduced.

本発明で使用する骨材とは、通常のモルタルに使用できるものであれば特に限定されるものではなく、川砂、川砂利、陸砂、陸砂利、砕砂、海砂等の天然骨材や、フライアッシュバルーン、黒曜石を原料として焼成して製造した骨材、セラミックバルーン、シラスバルーン、廃ガラスを原料とし焼成して製造した軽量骨材や、比重3.0g/cm以上の重量骨材を使用することもできる。重量骨材としては、例えば、電気炉酸化期スラグ系骨材や、フェロニッケルスラグ、フェロクロムスラグ、銅スラグ、亜鉛スラグおよび鉛スラグなどを総称する非鉄精錬スラグ骨材等が挙げられる。 The aggregate used in the present invention is not particularly limited as long as it can be used for ordinary mortar, natural aggregate such as river sand, river gravel, land sand, land gravel, crushed sand, sea sand, Fly ash balloons, aggregates made by firing from obsidian, ceramic balloons, shirasu balloons, lightweight aggregates made by firing from waste glass, and heavy aggregates with a specific gravity of 3.0 g / cm 3 or more It can also be used. Examples of the heavy aggregate include non-ferrous smelted slag aggregates that collectively refer to electric furnace oxidation period slag-based aggregates, ferronickel slag, ferrochrome slag, copper slag, zinc slag, lead slag, and the like.

本発明の乾燥収縮低減剤は、一般式(1)で表されるA成分と一般式(2)で表されるB成分を組み合わせたことに特徴がある。
A成分は、一般式(1) HO{(AO)a(C24O)b}−Hで表されるものである。一般式(1)に示されるAOは、炭素数3および/または4のオキシアルキレン基を表す。炭素数3はオキシプロピレン基、炭素数4はオキシブチレン基を表す。AOは炭素数が5以上であるとセメントと混和する場合、混合による均一化が期待できず、乾燥収縮低減効果が小さくなるので炭素数4以下が好ましい。AOがオキシプロピレン基とオキシブチレン基との共重合の場合は、ランダム付加でもブロック付加でもよい。a、bは、それぞれ、1≦a、1≦bを示し、また、2≦(a+b)≦30、0.4≦a/bを示す。好ましくは12≦(a+b)≦30である。また、1≦a/b≦10がより好ましく、さらに好ましくは1≦a/b≦5である。a、bがこの範囲を外れるとセメントと混和する場合、空気連行性が大きくなり、強度低下を生じ、乾燥収縮低減効果も小さくなる場合がある。(AO)と(CO)との組み合わせは、ランダム付加物でもブロック付加物でも良い。
B成分は、一般式(2) R´O(A´O)n´−Hで表されるものである。一般式(2)で示されるRは、炭素数2〜8のアルキル基を表し、例えば、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、t−ブチル基、n−ペンチル基、イソペンチル基、n−ヘキシル基、イソヘキシル基、n−ヘプチル基、イソヘプチル基、n−オクチル基、イソオクチル基を表し、n−ブチル基、イソブチル基、t−ブチル基が好ましく、n−ブチル基がより好ましい。A´Oは炭素数2および/または3のオキシアルキレン基を表す。炭素数2はオキシエチレン基、炭素数3はオキシプロピレン基を表す。nは1〜10を表し、A´Oが2種以上のオキシアルキレン基の場合は、オキシエチレン基、オキシプロピレン基の重合形態は特に限定されず、ランダム共重合、ブロック共重合、ランダム共重合/ブロック共重合であって良い。nが10を超えると、乾燥収縮低減効果が小さくなるので10以下が好ましく、1〜5がさらに好ましい。
The dry shrinkage reducing agent of the present invention is characterized by combining the component A represented by the general formula (1) and the component B represented by the general formula (2).
The component A is represented by the general formula (1) HO {(AO) a (C 2 H 4 O) b } -H. AO represented by the general formula (1) represents an oxyalkylene group having 3 and / or 4 carbon atoms. Carbon number 3 represents an oxypropylene group, and carbon number 4 represents an oxybutylene group. When AO has 5 or more carbon atoms and is mixed with cement, homogenization due to mixing cannot be expected, and the effect of reducing drying shrinkage is reduced. When AO is a copolymer of an oxypropylene group and an oxybutylene group, random addition or block addition may be used. a and b respectively represent 1 ≦ a and 1 ≦ b, and 2 ≦ (a + b) ≦ 30 and 0.4 ≦ a / b. Preferably, 12 ≦ (a + b) ≦ 30. Further, 1 ≦ a / b ≦ 10 is more preferable, and 1 ≦ a / b ≦ 5 is more preferable. When a and b are out of this range, when mixed with cement, air entrainment is increased, strength is reduced, and drying shrinkage reduction effect may be reduced. The combination of (AO) and (C 2 H 4 O) may be a random adduct or a block adduct.
The B component is represented by the general formula (2) R′O (A′O) n ′ -H. R represented by the general formula (2) represents an alkyl group having 2 to 8 carbon atoms, for example, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n- Pentyl group, isopentyl group, n-hexyl group, isohexyl group, n-heptyl group, isoheptyl group, n-octyl group, and isooctyl group are represented, and n-butyl group, isobutyl group, and t-butyl group are preferable, and n-butyl group Groups are more preferred. A′O represents an oxyalkylene group having 2 and / or 3 carbon atoms. Carbon number 2 represents an oxyethylene group, and carbon number 3 represents an oxypropylene group. n represents 1 to 10, and when A′O is two or more oxyalkylene groups, the polymerization form of the oxyethylene group and oxypropylene group is not particularly limited, and random copolymerization, block copolymerization, random copolymerization / Block copolymerization. If n exceeds 10, the effect of reducing drying shrinkage is reduced, so 10 or less is preferable, and 1 to 5 is more preferable.

本発明の乾燥収縮低減剤のA成分とB成分との配合割合は、A成分が10〜90質量%、B成分が10〜90質量%が好ましい。A成分が10質量%よりも少ない場合や90質量%より多い場合は、充分な複合効果が得られず乾燥収縮低減効果が小さくなる。また、A成分が10質量%より少ないと強度発現が改善できない場合がある。   The blending ratio of the A component and the B component of the drying shrinkage reducing agent of the present invention is preferably 10 to 90% by mass for the A component and 10 to 90% by mass for the B component. When the component A is less than 10% by mass or more than 90% by mass, a sufficient composite effect cannot be obtained and the drying shrinkage reduction effect is reduced. On the other hand, if the component A is less than 10% by mass, the strength expression may not be improved.

本発明の乾燥収縮低減剤の使用量は、アルミナセメント100質量部に対して、0.1〜10質量部が好ましく、0.5〜5質量部がより好ましい。0.1質量部未満では効果は小さく、10質量部を超えると強度発現に影響する場合がある。   0.1-10 mass parts is preferable with respect to 100 mass parts of alumina cement, and, as for the usage-amount of the drying shrinkage reducing agent of this invention, 0.5-5 mass parts is more preferable. If the amount is less than 0.1 parts by mass, the effect is small, and if it exceeds 10 parts by mass, strength development may be affected.

本発明の乾燥収縮低減剤は、固体状および液状であってもよいが、液状である方がアルミナセメントや砂と混合した場合の均一性が優れる。   The drying shrinkage reducing agent of the present invention may be solid or liquid, but the liquid state is more uniform when mixed with alumina cement or sand.

本発明の乾燥収縮低減剤の混合方法は、施工現場で水と練り混ぜるときに添加して混合してもよく、予めドライモルタルにプレミックスしても良い。現場で添加する場合は計量する作業が生じるので作業の簡素化を考慮すれば予めプレミックスした方がよい。   The method for mixing the drying shrinkage reducing agent of the present invention may be added and mixed when kneaded with water at the construction site, or may be premixed in dry mortar in advance. In the case of adding at the site, since the work of weighing occurs, it is better to premix in advance in consideration of the simplification of the work.

本発明で使用する膨張材は、モルタルの収縮抑制効果を発揮するために使用するもので、本発明の乾燥収縮低減剤と併用することで相乗効果が期待できる。
膨張材の種類としては、特に限定されるものではなく、一般に市販されているものが使用できる。例えば、エトリンガイト系膨張材、石灰系膨張材、石灰−エトリンガイト複合系膨張材等が挙げられる。これらを2種以上混合して使用してもよい。
The expandable material used in the present invention is used to exhibit a mortar shrinkage inhibiting effect, and a synergistic effect can be expected by using it together with the dry shrinkage reducing agent of the present invention.
The type of the expansion material is not particularly limited, and commercially available materials can be used. For example, an ettringite expansion material, a lime-based expansion material, a lime-ettringite composite expansion material, and the like can be given. Two or more of these may be mixed and used.

本発明の膨張材の使用量は、アルミナセメント100質量部に対して、1〜10質量部が好ましく、2〜8質量部がより好ましい。1質量部未満では、充分な収縮抑制の相乗効果が期待できず、10質量部を超えると膨張が大きすぎて強度低下を起こす場合がある。   1-10 mass parts is preferable with respect to 100 mass parts of alumina cement, and, as for the usage-amount of the expansion material of this invention, 2-8 mass parts is more preferable. When the amount is less than 1 part by mass, a sufficient synergistic effect of suppressing shrinkage cannot be expected, and when the amount exceeds 10 parts by mass, the expansion is too large and the strength may be lowered.

本発明で使用するポリマーディスパージョンとは、例えば、JIS A 6203で規定されているセメント混和用のポリマーであり、中性化、塩害、凍害等の耐久性を向上させ、モルタルの付着強度、曲げ強度、引張強度等の強度特性を改善する目的で使用する。例えば、アクリロニトリル・ブタジエンゴム、スチレン・ブタジエンゴム、クロロプレンゴム、および天然ゴム等のゴムラテックス、エチレン・酢酸ビニル共重合体、ポリアクリル酸エステル、酢酸ビニルビニルバーサテート系共重合体、およびスチレン・アクリル酸エステル共重合体やアクリロニトリル・アクリル酸エステルに代表されるアクリル酸エステル系共重合体、エポキシ樹脂、不飽和ポリエステル樹脂に代表される液状ポリマー等が挙げられ、これらの1種または2種以上の混合物を使用できる。   The polymer dispersion used in the present invention is, for example, a polymer for cement admixture defined in JIS A 6203, which improves durability such as neutralization, salt damage, frost damage, etc., adhesion strength of mortar, bending Used to improve strength properties such as strength and tensile strength. For example, rubber latex such as acrylonitrile-butadiene rubber, styrene-butadiene rubber, chloroprene rubber, and natural rubber, ethylene-vinyl acetate copolymer, polyacrylic acid ester, vinyl acetate vinyl versatate copolymer, and styrene-acrylic Examples include acid ester copolymers, acrylic ester copolymers typified by acrylonitrile / acrylic acid esters, epoxy resins, liquid polymers typified by unsaturated polyester resins, and the like. Mixtures can be used.

本発明のポリマーディスパージョンの使用量は、アルミナセメント100質量部に対して、固形分換算で1〜20質量部が好ましく、3〜15質量部がより好ましい。1質量部未満では耐久性の向上効果が小さく、20質量部を超えると強度発現性に影響する場合がある。   The amount of the polymer dispersion of the present invention is preferably 1 to 20 parts by mass, more preferably 3 to 15 parts by mass in terms of solid content with respect to 100 parts by mass of the alumina cement. If it is less than 1 part by mass, the effect of improving durability is small, and if it exceeds 20 parts by mass, the strength development may be affected.

本発明で使用する無機粉末とは、スラグ、シリカフューム、フライアッシュの中から選ばれる少なくとも1種であり、ダレ防止や各種耐久性を改善する目的で使用する。   The inorganic powder used in the present invention is at least one selected from slag, silica fume, and fly ash, and is used for the purpose of preventing sagging and improving various durability.

本発明の無機粉末の使用量は、アルミナセメント100質量部に対して、1〜20質量部が好ましく、3〜15質量部がより好ましい。1質量部未満ではダレ防止効果が小さく、20質量部を超えると強度発現性が低下する場合がある。   1-20 mass parts is preferable with respect to 100 mass parts of alumina cement, and, as for the usage-amount of the inorganic powder of this invention, 3-15 mass parts is more preferable. If it is less than 1 part by mass, the effect of preventing dripping is small, and if it exceeds 20 parts by mass, strength development may be reduced.

本発明で使用する繊維とは、モルタルのダレを改善したり、硬化する前のひび割れ防止効果を付与する目的で使用する。繊維の種類としては、特に限定されるものではなく、無機繊維、高分子繊維のいずれも使用できる。無機繊維としては、フライアッシュ、スラグ、玄武岩等を原料とし溶融吹き飛ばしたロックウールや溶融紡糸した繊維状のもの、ガラス繊維、鋼繊維等が挙げられる。高分子繊維としては、ビニロン繊維、ポリプロピレン繊維、ポリエチレン繊維、ナイロン繊維、アクリル繊維等が挙げられる。   The fiber used in the present invention is used for the purpose of improving the sagging of mortar or imparting the effect of preventing cracks before curing. The type of fiber is not particularly limited, and any of inorganic fibers and polymer fibers can be used. Examples of the inorganic fibers include rock wool melted and blown from fly ash, slag, basalt and the like, melt-spun fibers, glass fibers, steel fibers, and the like. Examples of the polymer fiber include vinylon fiber, polypropylene fiber, polyethylene fiber, nylon fiber, and acrylic fiber.

本発明の繊維の使用量は、アルミナセメントと骨材あるいはアルミナセメントと無機粉末と骨材の合計100質量部に対して、0.02〜2質量部が好ましく、0.05〜1質量部がより好ましい。0.02質量部未満ではひび割れ抑制効果が小さく、2質量部を超えると適度なモルタルの流動性を確保しづらくなる。   The amount of the fiber of the present invention is preferably 0.02 to 2 parts by mass, and 0.05 to 1 part by mass with respect to 100 parts by mass in total of the alumina cement and the aggregate or the alumina cement, the inorganic powder and the aggregate. More preferred. If it is less than 0.02 parts by mass, the effect of suppressing cracking is small, and if it exceeds 2 parts by mass, it is difficult to ensure adequate mortar fluidity.

本発明で使用する凝結促進剤とは、硬化時間をコントロールするもので、特に低温環境下で使用するものであり、炭酸、重炭酸、硫酸、ケイ酸、リン酸、硝酸、亜硝酸等のナトリウム塩、カリウム塩、及びリチウム塩や、ステアリン酸、乳酸、クエン酸等の有機酸のリチウム塩や、リチウムを含有する粘土鉱物等が挙げられる。硬化時間の調整のし易さの点でリチウムを含有する粘土鉱物が好ましい。   The setting accelerator used in the present invention controls the curing time, and is used particularly in a low temperature environment. Sodium such as carbonic acid, bicarbonate, sulfuric acid, silicic acid, phosphoric acid, nitric acid, and nitrous acid. Examples thereof include salts, potassium salts and lithium salts, lithium salts of organic acids such as stearic acid, lactic acid and citric acid, and clay minerals containing lithium. Clay minerals containing lithium are preferred from the viewpoint of easy adjustment of the curing time.

本発明の凝結促進剤の使用量は、アルミナセメント100質量部に対して、0.01〜1質量部が好ましく,0.05〜0.5質量部がより好ましい。0.01質量部未満では、凝結促進効果が小さく、1質量部を超えると凝結時間が早くなり、作業性が悪くなる場合がある。   The use amount of the setting accelerator of the present invention is preferably 0.01 to 1 part by mass and more preferably 0.05 to 0.5 part by mass with respect to 100 parts by mass of the alumina cement. If the amount is less than 0.01 parts by mass, the setting acceleration effect is small, and if it exceeds 1 part by mass, the setting time may be shortened and workability may be deteriorated.

本発明で使用する消泡剤とは、適度な空気連行性を調整する目的で使用する。消泡剤の種類としては、高級脂肪酸のアルキレンオキサイド付加物、グリコールのエチレンオキサイド付加物等のポリエーテル系消泡剤、ジメチルシリコーン等のシリコーン系消泡剤、トリブチルホスフェート等のトリアルキルホスフェート系消泡剤等がある。   The antifoaming agent used in the present invention is used for the purpose of adjusting moderate air entrainment. The types of antifoaming agents include: polyether oxide defoamers such as alkylene oxide adducts of higher fatty acids, glycol oxide oxide adducts, silicone defoamers such as dimethyl silicone, and trialkyl phosphate deodorants such as tributyl phosphate. There are foaming agents.

本発明の消泡剤の使用量は、アルミナセメント100質量部に対して、0.001〜0.5質量部が好ましく、0.003〜0.1質量部がより好ましい。0.001質量部未満では消泡効果は小さく、0.5質量部を超えても消泡効果が頭打ちとなり不経済となる場合がある。   0.001-0.5 mass part is preferable with respect to 100 mass parts of alumina cement, and, as for the usage-amount of the antifoamer of this invention, 0.003-0.1 mass part is more preferable. If it is less than 0.001 part by mass, the defoaming effect is small, and even if it exceeds 0.5 part by mass, the defoaming effect reaches its peak and may be uneconomical.

本発明の低収縮モルタル組成物は、その性能に悪影響を与えない範囲で各種混和剤を添加することができる。例えば、AE減水剤、高性能AE減水剤、流動化剤、防錆剤、防凍剤、凝結調整剤、粘土鉱物、増粘剤、抗菌剤等が挙げられる。   Various admixtures can be added to the low shrinkage mortar composition of the present invention as long as the performance is not adversely affected. For example, AE water reducing agent, high performance AE water reducing agent, fluidizing agent, rust preventive agent, antifreeze agent, setting modifier, clay mineral, thickener, antibacterial agent and the like can be mentioned.

本発明の低収縮モルタル組成物を用いた施工方法は、特に限定されるものではない。補修工事で行われている左官工法、吹付け工法、グラウト工法いずれの工法でも使用できる。例えば、欠損した箇所あるいは劣化部を除去した後の断面修復、不陸箇所等を平滑にする表面被覆材として使用可能である。それぞれの工法に適合するモルタル性状に水量や各種混和剤等を使用して調整すればよい。   The construction method using the low shrinkage mortar composition of the present invention is not particularly limited. The plastering method, spraying method, and grout method used in repair work can be used. For example, it can be used as a surface covering material for smoothing a cross-sectional repair after removing a missing portion or a deteriorated portion, a non-land portion, and the like. What is necessary is just to adjust using the amount of water, various admixtures, etc. in the mortar property suitable for each construction method.

以下、実施例で説明する。   Examples will be described below.

アルミナセメント100質量部に対して、骨材(砂)200質量部、表1に示すA成分として(イ)50質量部とB成分として(ロ)50質量部の混合物からなる乾燥収縮低減剤2質量部、膨張材を表2に示すように加え低収縮モルタル組成物を調製した。その低収縮モルタル組成物100質量部に対して水を45質量部加えモルタルミキサーで練混ぜた。得られたモルタルについて養生後、圧縮強度比、乾燥収縮低減比、中性化深さを測定した。なお、比較例(実験No.1-1〜実験No.1-5)では乾燥収縮低減剤をモルタルに加えなかった。結果を表2に示す。   Dry shrinkage reducing agent 2 comprising 200 parts by mass of aggregate (sand) with respect to 100 parts by mass of alumina cement, and a mixture of 50 parts by mass (A) as component A and 50 parts by mass as component B (B) shown in Table 1. As shown in Table 2, parts by mass and an expanding material were added to prepare a low shrinkage mortar composition. 45 parts by mass of water was added to 100 parts by mass of the low shrinkage mortar composition, and the mixture was kneaded with a mortar mixer. About the obtained mortar, after curing, compression strength ratio, drying shrinkage reduction ratio, and neutralization depth were measured. In Comparative Examples (Experiment No. 1-1 to Experiment No. 1-5), no drying shrinkage reducing agent was added to the mortar. The results are shown in Table 2.

(使用材料)
アルミナセメント:電気化学工業社製、アルミナセメント1号
膨張材:電気化学工業社製、CSA#20
砂:東海リテック社製、5、6、7号の各硅砂を等量配合、最大粒径1.2mm
水:水道水
乾燥収縮低減剤:表1に示す(イ)50質量部と表2に示す(ロ)50質量部の混合物
(Materials used)
Alumina cement: manufactured by Denki Kagaku Kogyo Co., Ltd., Alumina cement No. 1 expansion material: manufactured by Denki Kagaku Kogyo Co., CSA # 20
Sand: Made of Tokai Ritec Co., Ltd., equal amounts of No. 5, 6 and 7 dredged sand, maximum particle size 1.2mm
Water: tap water drying shrinkage reducing agent: a mixture of 50 parts by mass (b) shown in Table 1 and 50 parts by mass (b) shown in Table 2

Figure 0005221014
Figure 0005221014

(試験方法)
圧縮強度比:得られたモルタルを4×4×16cmの型枠に詰め、温度20℃、湿度60%の部屋で気中養生した。その時の測定材齢は1日及び28日。また、温度5℃、湿度60%の部屋で気中養生した。その時の測定材齢は1日、28日。圧縮強度の測定はJIS R 5201に準拠した。圧縮強度比は、各材齢において、本発明の乾燥収縮低減剤を含むモルタルの圧縮強度測定値/乾燥収縮低減剤無添加のモルタルの圧縮強度測定値として%で表した。
乾燥収縮低減比:JIS A 1129−3のモルタル及びコンクリートの長さ変化試験方法、ダイヤルゲージ法に準拠し温度20℃、湿度60%で材齢2日を基点とし材齢30日後の長さ変化を測定した。乾燥収縮低減比は、材齢30日後の本発明の乾燥収縮低減剤を含むモルタルの長さ変化測定値/乾燥収縮低減剤無添加のモルタルの長さ変化測定値として%で表した。
中性化深さ:JIS A 1171に準拠して測定した。
(Test method)
Compressive strength ratio: The obtained mortar was packed in a 4 × 4 × 16 cm mold and cured in air in a room at a temperature of 20 ° C. and a humidity of 60%. The material age at that time is 1 day and 28 days. Further, it was cured in the air in a room at a temperature of 5 ° C. and a humidity of 60%. The material age at that time is 1 day and 28 days. The measurement of compressive strength was based on JIS R5201. The compressive strength ratio was expressed in% as the measured compressive strength value of the mortar containing the drying shrinkage reducing agent of the present invention / the measured compressive strength value of the mortar without adding the drying shrinkage reducing agent at each age.
Drying shrinkage reduction ratio: JIS A 1129-3 mortar and concrete length change test method, according to dial gauge method, temperature change at a temperature of 20 ° C and humidity of 60%, based on a material age of 2 days and after 30 days of material age Was measured. The drying shrinkage reduction ratio was expressed in% as a measured change in length of a mortar containing a dry shrinkage reducing agent of the present invention after 30 days of age / a measured change in length of a mortar without addition of a dry shrinkage reducing agent.
Neutralization depth: measured in accordance with JIS A 1171.

Figure 0005221014
Figure 0005221014

表2より、本発明の低収縮モルタル組成物は、常温、低温において圧縮強度発現性は良好で、乾燥収縮を著しく低減していることが分かる。また、優れた中性化抑制効果を有していることが分かる。   From Table 2, it can be seen that the low shrinkage mortar composition of the present invention has good compressive strength at room temperature and low temperature, and remarkably reduces drying shrinkage. Moreover, it turns out that it has the outstanding neutralization inhibitory effect.

実施例1の実験No.1-8において、乾燥収縮低減剤のA成分とB成分の種類(表1、表3)と配合割合を表4に示すように変えたこと以外は実施例1と同様に行った。結果を表4に示す。   In Experiment No. 1-8 of Example 1, Example 1 except that the types (Tables 1 and 3) and the blending ratios of the components A and B of the drying shrinkage reducing agent were changed as shown in Table 4. The same was done. The results are shown in Table 4.

Figure 0005221014
Figure 0005221014

Figure 0005221014
Figure 0005221014

表4より、本発明の低収縮モルタル組成物は、常温、低温において圧縮強度発現性は良好で、乾燥収縮を著しく低減していることが分かる。また、優れた中性化抑制効果を有していることが分かる。   From Table 4, it can be seen that the low shrinkage mortar composition of the present invention has good compressive strength at room temperature and low temperature, and remarkably reduces drying shrinkage. Moreover, it turns out that it has the outstanding neutralization inhibitory effect.

実施例1の実験No.1-8において、乾燥収縮低減剤の使用量を表5に示すように変えたこと以外は実施例1と同様に行った。結果を表5に示す。   The experiment was conducted in the same manner as in Example 1 except that the amount of the drying shrinkage reducing agent used in Experiment No. 1-8 of Example 1 was changed as shown in Table 5. The results are shown in Table 5.

Figure 0005221014
Figure 0005221014

表5より、本発明の低収縮モルタル組成物は、常温、低温において圧縮強度発現性は良好で、乾燥収縮を著しく低減していることが分かる。また、優れた中性化抑制効果を有していることが分かる。   From Table 5, it can be seen that the low shrinkage mortar composition of the present invention has good compressive strength at room temperature and low temperature, and remarkably reduces drying shrinkage. Moreover, it turns out that it has the outstanding neutralization inhibitory effect.

実施例1の実験No.1-8において、さらに、アルミナセメント100質量部に対して、ポリマーディスパージョン(固形分換算)の使用量を表6に示すように変えたこと以外は実施例1と同様に行った。結果を表6に示す。   In Experiment No. 1-8 of Example 1, Example 1 except that the amount of polymer dispersion (converted to solid content) was changed as shown in Table 6 with respect to 100 parts by mass of alumina cement. The same was done. The results are shown in Table 6.

(使用材料)
ポリマーディスパージョン:エロテックス社製、再乳化型粉末スチレン−アクリル系樹脂
(Materials used)
Polymer dispersion: made by Erotex, re-emulsifying powder styrene-acrylic resin

Figure 0005221014
Figure 0005221014

表6より、本発明の低収縮モルタル組成物は、ポリマーディスパージョンを添加することにより、さらに乾燥収縮を低減し、より優れた中性化抑制効果を有していることが分かる。   From Table 6, it can be seen that the low shrinkage mortar composition of the present invention has a more excellent neutralization inhibitory effect by further reducing the drying shrinkage by adding the polymer dispersion.

実施例1の実験No.1-8において、さらに、アルミナセメント100質量部に対して、無機粉末の使用量を表7に示すように変え、ダレ抵抗性を評価したこと以外は実施例1と同様に行った。結果を表7に示す。   In Experiment No. 1-8 of Example 1, with respect to 100 parts by mass of alumina cement, the amount of inorganic powder used was changed as shown in Table 7 and the sagging resistance was evaluated. The same was done. The results are shown in Table 7.

(使用材料)
無機粉末:シリカフューム、市販品、BET比表面積10m/g
(Materials used)
Inorganic powder: Silica fume, commercial product, BET specific surface area 10 m 2 / g

(試験方法)
ダレ抵抗性:縦30cm×横30cm×厚み6cmのコンクリート製平版の表面を湿らせ、厚み2cmでモルタルを塗り付けて24時間後の付着状態を観察した。異常なければ○とし、はらんだり、ずれ落ちたりすれば×とした。試験は温度20℃、湿度60%の室内で行った。
(Test method)
Sagging resistance: The surface of a concrete lithographic plate having a length of 30 cm, a width of 30 cm and a thickness of 6 cm was moistened, mortar was applied at a thickness of 2 cm, and the adhesion state after 24 hours was observed. If it was not abnormal, it was rated as ○, and if it got stuck or slipped off, it was marked as ×. The test was conducted in a room at a temperature of 20 ° C. and a humidity of 60%.

Figure 0005221014
Figure 0005221014

表7より、本発明の低収縮モルタル組成物は、無機粉末を添加することにより、ダレ抵抗性が良好であることが分かる。   From Table 7, it can be seen that the low shrinkage mortar composition of the present invention has good sagging resistance by adding inorganic powder.

実施例1の実験No.1-8において、さらに、アルミナセメントと砂の合計100質量部に対して、繊維の使用量を表8に示すように変え、実施例5と同様にダレ抵抗性を測定し、さらに、モルタルの硬化前のひび割れ抵抗性を測定したこと以外は実施例1と同様に行った。結果を表8に示す。   In Experiment No. 1-8 of Example 1, the amount of fibers used was changed as shown in Table 8 with respect to 100 parts by mass of the alumina cement and sand, and the sagging resistance was changed in the same manner as in Example 5. The measurement was performed in the same manner as in Example 1 except that the crack resistance before curing of the mortar was measured. The results are shown in Table 8.

(使用材料)
繊維:クラレ社製、ビニロン繊維、繊維長6mm、繊維径26μm
(Materials used)
Fiber: Kuraray Co., Ltd., vinylon fiber, fiber length 6 mm, fiber diameter 26 μm

(試験方法)
硬化前のひび割れ抵抗性:横30cm×縦30cm×厚さ6cmのコンクリート平板に厚み1cmとなるように打設した。打設完了した試験体は、湿度60%、温度5℃で、風機で風速1〜3mの風をあてた状態で1日後のひび割れ状況を確認した。ひび割れ発生が無ければ○とし、微細ひび割れまたは2本以内の場合は△、3本以上の場合は×とした。
(Test method)
Crack resistance before curing: It was placed on a concrete flat plate having a width of 30 cm, a length of 30 cm and a thickness of 6 cm so as to have a thickness of 1 cm. Specimens that were completed pouring, the humidity 60%, at a temperature of 5 ℃, was confirmed cracks situation after one day in a state that rely on the wind of the wind speed 1~3m in sending wind machine. If there was no occurrence of cracks, it was rated as ◯. If there were fine cracks or 2 or less, Δ, and if 3 or more, it was marked as ×.

Figure 0005221014
Figure 0005221014

表8より、本発明の低収縮モルタル組成物は、繊維を添加することにより、ダレ抵抗性、ひび割れ抵抗性が良好であることが分かる。   From Table 8, it can be seen that the low shrinkage mortar composition of the present invention has good sagging resistance and crack resistance by adding fibers.

実施例1の実験No.1-8において、さらに、アルミナセメント100質量部に対して、凝結促進剤の使用量を表9に示すように変え、低温(5℃)での硬化性状を評価したこと以外は実施例1と同様に行った。結果を表9に示す。   In Experiment No. 1-8 of Example 1, the amount of setting accelerator used was changed as shown in Table 9 with respect to 100 parts by mass of alumina cement, and the curing properties at low temperature (5 ° C.) were evaluated. Except that, the same procedure as in Example 1 was performed. The results are shown in Table 9.

(使用材料)
凝結促進剤:エレメンティスジャパン社製、ベントンOC、リチウム含有粘土鉱物(ヘクトライト)、リチウム含有量1質量%
(Materials used)
Setting accelerator: manufactured by Elementis Japan, Benton OC, lithium-containing clay mineral (hectorite), lithium content 1% by mass

(試験方法)
低温での硬化性状:5℃の恒温室において、4×4×16cmの型枠にモルタルを打設、その硬化時間(指で押してへこまない時点)を測定した。
(Test method)
Curing property at low temperature: In a thermostatic chamber at 5 ° C., mortar was placed in a 4 × 4 × 16 cm mold, and its curing time (when it was not depressed by pressing with a finger) was measured.

Figure 0005221014
Figure 0005221014

表9から、本発明の低収縮モルタル組成物は、凝結促進剤を添加することにより、低温での硬化性状が著しく向上することが分かる。   From Table 9, it can be seen that the low shrinkage mortar composition of the present invention is remarkably improved in curability at low temperatures by adding a setting accelerator.

実施例1の実験No.1-8において、さらに、アルミナセメント100質量部に対して、消泡剤の使用量を表10に示すように変え、モルタルの単位容積質量を測定したこと以外は実施例1と同様に行った。結果を表10に示す。   In Experiment No. 1-8 of Example 1, with respect to 100 parts by mass of alumina cement, the amount of defoaming agent used was changed as shown in Table 10, and the unit volume mass of mortar was measured. Performed as in Example 1. The results are shown in Table 10.

(使用材料)
消泡剤:ポリエーテル系消泡剤、市販品
(Materials used)
Antifoaming agent: polyether antifoaming agent, commercial product

(試験方法)
単位容積質量:JIS A 1171に準拠して測定した。
(Test method)
Unit volume mass: Measured according to JIS A 1171.

Figure 0005221014
Figure 0005221014

表10から、本発明の低収縮モルタル組成物は、消泡剤を添加すると、単位容積質量が増え、さらに乾燥収縮を低減し、より優れた中性化抑制効果を有していることが分かる。   From Table 10, it can be seen that the low shrinkage mortar composition of the present invention increases the unit volume mass when the antifoaming agent is added, further reduces the drying shrinkage, and has a more excellent neutralization inhibiting effect. .

本発明は、乾燥収縮を著しく低減するだけでなく、中性化抑制効果を有し、低温性状が良好な低収縮モルタル組成物が得られるので、土木、建築分野において、特に補修工事等に適用できる。   The present invention not only significantly reduces drying shrinkage, but also has a neutralization-inhibiting effect, and a low-shrinkage mortar composition with good low-temperature properties can be obtained, so it is particularly applicable to civil engineering and construction fields, such as repair work. it can.

Claims (7)

アルミナセメント、骨材、膨張材、および一般式(1)で表されるA成分が10〜90質量%、一般式(2)で表されるB成分が10〜90質量%の割合からなる乾燥収縮低減剤を含有してなり、膨張材がアルミナセメント100質量部に対して1〜10質量部であり、乾燥収縮低減剤がアルミナセメント100質量部に対して0.1〜10質量部であることを特徴とする低収縮モルタル組成物。
一般式(1) HO{(AO)a(C24O)b}−H
ただし、AOは炭素数3および/または4のオキシアルキレン基を表し、a、bはそれぞれ、1≦a、1≦bであり、また、2≦(a+b)≦30、0.4≦a/bである。ランダム付加物でもブロック付加物でも良い。
一般式(2) R´O(A´O)n´−H
ただし、R´は炭素数で2〜8のアルキル基を表し、A´Oは炭素数2および/または3のオキシアルキレン基を表し、n´は1〜10を表す。
Aluminium cement, aggregate, expanded material, and a dry composition comprising 10 to 90% by mass of component A represented by general formula (1) and 10 to 90% by mass of component B represented by general formula (2). It contains a shrinkage reducing agent, the expansion material is 1 to 10 parts by mass with respect to 100 parts by mass of the alumina cement, and the dry shrinkage reducing agent is 0.1 to 10 parts by mass with respect to 100 parts by mass of the alumina cement. A low shrinkage mortar composition characterized by the above.
General formula (1) HO {(AO) a (C 2 H 4 O) b } -H
However, AO represents an oxyalkylene group having 3 and / or 4 carbon atoms, a and b are 1 ≦ a and 1 ≦ b, respectively, and 2 ≦ (a + b) ≦ 30 and 0.4 ≦ a / b. A random adduct or a block adduct may be used.
General formula (2) R'O (A'O) n ' -H
However, R ′ represents an alkyl group having 2 to 8 carbon atoms, A′O represents an oxyalkylene group having 2 and / or 3 carbon atoms, and n ′ represents 1 to 10.
乾燥収縮低減剤が液体である請求項1記載の低収縮モルタル組成物。 The low shrinkage mortar composition according to claim 1, wherein the drying shrinkage reducing agent is a liquid. スラグ、シリカフューム、およびフライアッシュの中から選ばれる少なくとも1種の無機粉末を含有してなり、無機粉末がアルミナセメント100質量部に対して1〜20質量部である、請求項1または2記載の低収縮モルタル組成物。 The inorganic powder selected from slag, silica fume, and fly ash is contained, and the inorganic powder is 1 to 20 parts by mass with respect to 100 parts by mass of the alumina cement. Low shrink mortar composition. ポリマーディスパージョンを含有してなり、ポリマーディスパージョンがアルミナセメント100質量部に対して固形分換算で20質量部以下である、請求項1〜3のいずれか1項記載の低収縮モルタル組成物。 The low-shrinkage mortar composition according to any one of claims 1 to 3, comprising a polymer dispersion, wherein the polymer dispersion is 20 parts by mass or less in terms of solid content with respect to 100 parts by mass of the alumina cement. 繊維を含有してなり、繊維がアルミナセメントと骨材あるいはアルミナセメントと無機粉末と骨材の合計100質量部に対して0.02〜2質量部である、請求項1〜4のいずれか1項記載の低収縮モルタル組成物。 And also contains a fiber, is 0.02 to 2 parts by weight per 100 parts by weight of fibers of alumina cement and aggregate or alumina cement and inorganic powder and aggregate, any of the preceding claims 1 The low shrinkage mortar composition according to Item. 凝結促進剤を含有してなり、凝結促進剤がアルミナセメント100質量部に対して1質量部以下である、請求項1〜5のいずれか1項記載の低収縮モルタル組成物。 The low shrinkage mortar composition according to any one of claims 1 to 5, comprising a setting accelerator, wherein the setting accelerator is 1 part by mass or less with respect to 100 parts by mass of the alumina cement. 消泡剤を含有する請求項1〜6のいずれか1項記載の低収縮モルタル組成物。 The low shrinkage mortar composition according to any one of claims 1 to 6, comprising an antifoaming agent.
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